For 16-20-Inch-long Aquariums!
Order processing time: 3–5 business days
Bring the vibrant colors and natural brilliance of a coral reef to your aquarium with the Hygger Eyeball Aluminum Alloy Reef Light HG171-36W, a compact yet powerful full-spectrum LED saltwater aquarium light designed for nano reef tanks, soft corals, LPS corals, marine fish, and carefully planned mixed reef aquariums. Featuring 30 high-efficiency LEDs, three selectable lighting modes, five adjustable brightness levels, a built-in timer, and a flexible 360-degree gooseneck mounting system, the Hygger HG171 delivers customizable reef illumination in a sleek, space-saving design.
Engineered for 16–20 inch marine aquariums, this 36W reef light combines blue, royal blue, violet, UV, white, and red LEDs to create a balanced spectrum that enhances coral fluorescence and supports the photosynthetic needs of compatible reef organisms. Its compact eyeball-style light head produces concentrated illumination while a specially designed optical lens helps distribute light throughout the aquarium.
The HG171 also features a premium aluminum alloy housing, an upgraded ball-bearing cooling fan, and an adjustable mounting bracket compatible with many rimmed and rimless aquariums. The external controller makes it easy to customize lighting intensity, select your preferred color combination, and establish a consistent daily lighting schedule.
Whether you're building your first nano reef aquarium, illuminating a collection of colorful zoanthids, maintaining LPS corals, or upgrading the lighting above a marine display, the Hygger HG171-36W offers an excellent combination of performance, flexibility, and attractive reef lighting.
Benefits of the Hygger Eyeball Aluminum Alloy Reef Light HG171-36W
Powerful 36W Reef LED Lighting: Provides concentrated illumination for compatible nano reef and marine aquariums.
30 Full-Spectrum LEDs: Combines six LED color types to support coral viewing and photosynthesis.
Designed for 16–20 Inch Aquariums: Ideal for many compact saltwater and nano reef setups.
Enhanced Coral Fluorescence: Blue, royal blue, and violet lighting helps reveal vibrant fluorescent coral pigments.
Three Selectable Lighting Modes: Choose Blue, Blue + White, or Full Spectrum White.
Five Brightness Levels: Adjust intensity to 10%, 32%, 55%, 77%, or 100%.
Built-In Lighting Timer: Automates daily lighting periods without requiring a separate timer.
360-Degree Flexible Gooseneck: Easily adjust the position and angle of the light.
Compact Eyeball-Style Design: Delivers powerful illumination without a bulky overhead fixture.
Advanced Optical Lens: Helps provide balanced light distribution and useful penetration.
High PAR Performance: Manufacturer-published measurements demonstrate substantial light output at different distances.
Premium Aluminum Alloy Housing: Durable construction designed for efficient heat dissipation.
Upgraded Ball-Bearing Cooling Fan: Helps manage operating temperature during extended use.
Quiet Cooling Design: Manufacturer-rated operating noise below 35 dB.
Rimmed and Rimless Aquarium Compatibility: Secure mounting with an adjustable bracket.
Easy Installation: Convenient clamp-style mounting without drilling or permanent aquarium modifications.
Full-Spectrum LED Lighting for Coral Reef Aquariums
The Hygger HG171-36W uses a carefully selected combination of LEDs designed for marine aquarium lighting.
Unlike standard freshwater aquarium lights, the HG171 emphasizes blue and violet wavelengths commonly used in reef lighting.
These wavelengths are particularly important for illuminating the fluorescent pigments found in many corals.
30 High-Efficiency LED Beads
The HG171 contains:
This combination provides a broad lighting spectrum with a strong emphasis on blue wavelengths.
White LEDs for Natural Viewing
The 6700K white LEDs contribute to a brighter, more natural-looking aquarium appearance.
They help display the details of live rock, fish, coral structures, and substrate.
Blue and Royal Blue LEDs
The 453 nm and 465 nm LEDs provide the blue-rich lighting commonly associated with marine aquariums.
These wavelengths contribute to photosynthetically useful light and can make fluorescent coral pigments appear more vibrant.
Violet and Near-UV LEDs
The 395 nm and 415 nm LEDs contribute additional short-wavelength illumination.
They can enhance the appearance of certain fluorescent coral pigments.
Red LED
The 660 nm red LED adds a longer-wavelength component to the overall spectrum.
It also contributes to the visual appearance of marine fish and coral coloration.
Beautiful Coral Fluorescence and Color Enhancement
One of the most attractive features of the Hygger HG171 is its ability to highlight fluorescent coral coloration.
Many reef corals contain pigments that absorb certain wavelengths of light and emit visible fluorescence.
Blue-rich aquarium lighting can make these pigments appear especially vivid.
Zoanthid Coral Displays
Blue and violet illumination can help highlight the bright colors and fluorescent patterns of zoanthids.
Mushroom Corals
Many mushroom corals display attractive coloration under suitable reef lighting.
LPS Corals
The HG171 can enhance the appearance of compatible LPS corals, including colorful fleshy coral varieties.
Soft Coral Aquariums
The adjustable spectrum allows users to create attractive viewing conditions for compatible soft coral displays.
Marine Fish Coloration
The combination of blue and white lighting helps reveal the patterns and colors of saltwater fish.
Reef Aquascaping
The concentrated light helps create attractive highlights and shadows across live rock and coral formations.
Actual coral coloration depends on coral species, pigmentation, water chemistry, and overall aquarium conditions.
Three Adjustable Reef Lighting Modes
The HG171 features three selectable lighting modes.
These allow aquarium owners to choose between blue-dominant lighting and brighter full-spectrum illumination.
Mode 1: Blue Light
Blue Mode emphasizes the fixture's blue-rich lighting.
Benefits include:
Enhanced coral fluorescence
Attractive blue reef appearance
Increased visibility of fluorescent pigments
Decorative evening-style aquarium viewing
Blue Mode is useful when you want to highlight the vivid fluorescent colors of compatible corals.
Mode 2: Blue + White Light
Blue + White Mode combines blue illumination with white light.
This produces a brighter, more balanced reef appearance.
Benefits include:
Clearer viewing of fish and coral structures
Balanced blue and white illumination
Attractive coloration for everyday viewing
Improved visibility of live rock and aquarium decorations
This mode is a practical choice for many routine reef aquarium lighting applications.
Mode 3: Full Spectrum White Light
Full Spectrum White Mode provides a brighter, more natural-looking lighting appearance.
Benefits include:
Daylight-style reef illumination
Improved visibility during aquarium maintenance
Clear viewing of coral structures
Attractive presentation of marine fish and aquascaping details
Select the lighting mode that best matches your aquarium's inhabitants and viewing preferences.
Five Adjustable Brightness Levels
The Hygger HG171 allows users to customize lighting intensity through its external controller.
The five available brightness settings are:
10% Brightness: Low-intensity illumination for gentle viewing or acclimation.
32% Brightness: Reduced lighting for sensitive or newly introduced corals.
55% Brightness: Moderate illumination for compatible reef setups.
77% Brightness: Increased intensity for aquariums requiring stronger lighting.
100% Brightness: Maximum available output for suitable aquarium conditions.
Gradual Coral Acclimation
When introducing a new reef light, it is important to avoid sudden increases in illumination.
Begin with a lower brightness setting and increase gradually as appropriate.
Adjust for Aquarium Depth
Deeper aquariums may require greater light intensity to reach lower coral placements.
Adjust for Coral Species
Different corals have different lighting requirements.
Soft corals, LPS corals, and SPS corals should not automatically receive the same intensity.
Control Excessive Lighting
Reducing brightness can help prevent excessive light exposure when a fixture is installed close to the water surface.
Built-In Timer for Consistent Daily Lighting
The HG171 includes a convenient timer function that allows aquarium owners to automate the daily lighting schedule.
A consistent lighting period is important for reef aquarium stability and for avoiding unnecessary changes in light exposure.
Convenient Automatic Operation
The timer turns the light off after the selected operating period.
Three Preset Timer Options
Hygger's published materials describe three preset timer settings. The product page and other manufacturer materials differ on the shortest preset, listing either 3 or 6 hours, alongside 9 and 12 hours.
Refer to the timer markings on your supplied controller and its accompanying manual for the exact settings.
Consistent Lighting Schedule
A regular photoperiod helps establish predictable lighting conditions.
Reduced Manual Switching
The timer allows users to avoid turning the light on and off manually every day.
Lighting Duration Considerations
The appropriate daily photoperiod depends on coral species, light intensity, and the aquarium's overall condition.
Many reef aquarium lighting schedules use approximately 6–12 hours of total illumination, although individual coral requirements vary.
Important: The HG171 provides preset lighting modes and timer control. It is not advertised as having independently programmable RGB channels or a fully customizable sunrise-to-sunset ramping schedule.
Manufacturer-Published PAR Performance
PAR, or photosynthetically active radiation, describes the portion of light useful for photosynthesis.
Reef aquarium lighting is often evaluated using PAR measurements because corals contain photosynthetic symbiotic organisms that rely on appropriate illumination.
The Hygger HG171 has published PAR readings measured at several distances.
<text> </text>
PAR at 7 Inches
431 µmol/m²/s
This demonstrates the fixture's concentrated output at a relatively short measurement distance.
PAR at 12 Inches
182 µmol/m²/s
This indicates a moderate-to-strong measured light intensity at this distance.
PAR at 16 Inches
137 µmol/m²/s
This demonstrates useful light penetration farther from the fixture.
PAR at 19 Inches
93 µmol/m²/s
This shows the light output at the longest manufacturer-published measurement distance.
Important PAR Considerations
These figures are manufacturer-published measurements under specific test conditions.
Actual PAR in your aquarium will vary depending on:
The listed PAR readings should not be interpreted as guaranteed measurements at every point in the aquarium.
For demanding corals, a PAR meter can help verify actual light intensity.
Designed for 16–20 Inch Nano Reef Aquariums
The Hygger HG171-36W is specifically marketed for marine aquariums approximately:
16–20 inches / 40–50 cm long
Its compact light head and flexible mounting system make it a practical choice for smaller reef displays.
Nano Reef Aquariums
The HG171 is well suited to compatible compact marine aquariums.
Small Mixed Reef Displays
The adjustable spectrum and brightness make it useful for carefully planned mixed coral aquariums.
Soft Coral Aquariums
The light is particularly suitable for compatible soft coral systems.
LPS Coral Aquariums
The HG171 is also designed for compatible LPS coral reef setups.
SPS Coral Considerations
Some SPS corals require more intense and consistent illumination than a single compact fixture can provide.
Hygger recommends using two HG171 lights for certain SPS coral applications.
The appropriate number of fixtures depends on coral placement, aquarium depth, and measured PAR.
Wide-Angle Optical Lens for Reef Coverage
The HG171 uses a specially designed optical lens to distribute light across the aquarium.
The manufacturer describes coverage reaching up to approximately 24 × 24 inches under suitable conditions.
Balanced Light Distribution
The lens helps spread illumination across the reef display.
Reduced Harsh Spotlighting
A broader beam can help soften the difference between the brightest central area and surrounding regions.
Useful Light Penetration
The concentrated 36W output helps deliver light through the aquarium water column.
Attractive Aquascape Appearance
The light creates highlights and shadows that add depth to reef structures.
Coverage Versus Recommended Aquarium Size
Although Hygger describes optical coverage up to 24 × 24 inches, its recommended aquarium length for the HG171 is 16–20 inches.
The larger coverage figure should not be interpreted as a guarantee of sufficient coral-growing PAR across a 24-inch aquarium.
360-Degree Flexible Gooseneck Mount
The Hygger HG171 includes a flexible gooseneck mounting system that allows users to adjust the position and angle of the light.
Flexible Positioning
Bend the gooseneck to direct illumination toward the desired area.
360-Degree Adjustment
The mounting arm allows flexible positioning around the aquarium.
Targeted Coral Lighting
Adjust the light to illuminate selected coral structures or aquascaping features.
Compact Installation
The gooseneck design avoids the need for a large overhead fixture.
Convenient Aquarium Access
The flexible arm can be repositioned to provide access for aquarium feeding and maintenance.
Gooseneck Height
The manufacturer describes the adjustable gooseneck as approximately:
13.4 inches / 34 cm
The exact usable mounting height depends on bracket positioning and the selected bend.
Premium Aluminum Alloy Housing
The HG171 features a durable aluminum alloy light housing designed for long-term aquarium use.
Efficient Heat Dissipation
Aluminum conducts heat efficiently, helping transfer heat away from the LED components.
Multi-Fin Cooling Design
The housing incorporates a multi-fin structure that increases the surface area available for heat dissipation.
Durable Construction
The aluminum alloy housing provides a sturdy exterior.
Corrosion-Resistant Finish
The mounting components feature an anti-rust design intended for marine aquarium environments.
Compact Light Head
The eyeball-style light head measures approximately:
3.58 inches / 9.1 cm in diameter
This compact design helps keep the fixture visually unobtrusive above the aquarium.
Upgraded Ball-Bearing Cooling Fan
High-output LED lighting produces heat during operation.
The Hygger HG171 includes an upgraded ball-bearing cooling fan designed to help maintain suitable operating temperatures.
Active Cooling
The fan moves air through the light housing to remove heat.
Ball-Bearing Design
The upgraded fan uses ball bearings to reduce friction during rotation.
Efficient Thermal Management
The combination of active airflow and aluminum cooling fins helps maintain stable operating conditions.
Low-Noise Operation
Hygger describes the fixture as operating below approximately:
35 dB
Actual sound levels depend on the installation environment, fan condition, and surrounding noise.
Manufacturer-Estimated Fan Life
Hygger describes the ball-bearing cooling system as having an estimated service life of approximately 60,000–100,000 hours.
This is a component-life estimate, not a guarantee that the entire lighting fixture will operate for that period.
Proper Ventilation
Keep the fan vents unobstructed and avoid installing the fixture in an enclosed space without adequate airflow.
Compatible with Rimmed and Rimless Aquariums
The HG171 includes an adjustable mounting bracket designed to fit many aquarium configurations.
Rimless Aquariums
The clamp can attach to compatible rimless glass aquariums.
Rimmed Aquariums
The bracket is also designed to accommodate many aquarium rims.
Adjustable Clamp
The mounting system allows adjustment for different aquarium wall thicknesses.
Aquarium Thickness Compatibility
Hygger's official user manual specifies a maximum mounting thickness of approximately:
0.95 inches / 2.4 cm
The manufacturer also describes compatibility with aquarium glass or rim thicknesses starting around 0.2 inches.
Secure Installation
The bracket includes set screws that help hold the light in position.
Important Compatibility Note
Measure the aquarium's rim or mounting surface before installation.
Unusually shaped or heavily reinforced aquarium rims may not fit the bracket even if their thickness is within the stated range.
Suitable for Soft Coral Aquariums
The HG171 is specifically recommended by Hygger for soft coral reef systems.
Soft corals are popular among reef aquarium enthusiasts because many species are relatively adaptable when provided with suitable water quality, lighting, and circulation.
Zoanthids
The blue-rich spectrum can enhance the fluorescent appearance of colorful zoanthid colonies.
Mushroom Corals
Many mushroom corals can be maintained under moderate reef lighting when positioned appropriately.
Leather Corals
Compatible leather coral species can benefit from suitable illumination and stable aquarium conditions.
Green Star Polyps
Green Star Polyps can display attractive fluorescence under blue-rich lighting.
Other Soft Corals
The HG171 may be suitable for additional soft coral species when their individual lighting requirements are met.
Always consider the coral's preferred PAR range rather than relying only on coral category.
Suitable for LPS Coral Aquariums
The HG171 is also designed for compatible large-polyp stony coral systems.
LPS corals are valued for their colorful tissues, interesting structures, and movement.
Duncan Corals
Duncan corals can be suitable for appropriately lit reef aquariums.
Candy Cane Corals
Candy Cane corals often display attractive coloration under balanced reef lighting.
Hammer Corals
Compatible hammer coral varieties can be maintained under suitable lighting and water movement.
Frogspawn Corals
Frogspawn corals can create attractive movement and color in a reef aquarium.
Acan Corals
Many Acan coral varieties show vivid fluorescent pigmentation under blue-rich light.
Coral Placement
Position each coral according to its lighting requirements and gradually acclimate it to the HG171.
SPS Coral Lighting Considerations
Small-polyp stony corals often require more demanding lighting and aquarium conditions.
The Hygger HG171 can contribute to SPS coral illumination, but one fixture may not provide sufficient coverage or intensity for every SPS aquarium.
Additional Lighting May Be Required
Hygger recommends two lights for some SPS coral applications.
PAR Verification
Use measured PAR values when selecting coral placement.
Stable Aquarium Conditions
SPS coral health also depends on stable alkalinity, calcium, magnesium, salinity, nutrients, and water movement.
Gradual Acclimation
Avoid introducing SPS corals directly into high-intensity lighting without an appropriate acclimation process.
Enhance Marine Fish and Live Rock Displays
The HG171 is not limited to coral-focused visual enhancement.
It also provides attractive illumination for compatible saltwater fish aquariums.
Marine Fish
The full-spectrum output helps display fish coloration and patterns.
Live Rock Aquascapes
The concentrated lighting creates shadows and highlights across live rock structures.
Decorative Reef Displays
The three lighting modes allow users to change the visual appearance of the aquarium.
Coral Frag Displays
The compact fixture may be useful for compatible small coral frag setups when the required light intensity is verified.
Suitable Aquarium Applications
The Hygger Eyeball Aluminum Alloy Reef Light HG171-36W is suitable for:
Nano reef aquariums
16–20 inch saltwater aquariums
Soft coral reef tanks
LPS coral aquariums
Compatible mixed reef systems
Zoanthid displays
Mushroom coral aquariums
Marine fish tanks
Live rock aquascapes
Small coral frag displays
Rimmed marine aquariums
Rimless reef aquariums
Aquariums requiring adjustable blue-rich lighting
Reef systems requiring compact overhead illumination
Supplemental lighting for selected coral applications
The HG171 is designed primarily for saltwater and reef aquarium use.
How to Choose the Best Lighting Mode
For Coral Fluorescence
Choose Blue Mode to emphasize fluorescent pigments.
For Everyday Reef Viewing
Choose Blue + White Mode for a balanced combination of brightness and coral color.
For Natural-Looking Illumination
Choose Full Spectrum White Mode for a brighter daylight-style appearance.
For Newly Introduced Corals
Begin at a lower brightness setting and increase gradually.
For Deeper Coral Placement
Evaluate whether additional brightness or supplemental lighting is required.
For Sensitive Corals
Avoid excessive light intensity and position corals according to their individual requirements.
Installation and Usage Guidelines
Inspect the package: Check the light head, mounting bracket, controller, adapter, and set screws.
Confirm aquarium compatibility: Ensure the aquarium is approximately 16–20 inches long and has a suitable mounting rim.
Choose the mounting location: Select a stable position along the aquarium wall.
Attach the bracket: Position the clamp on the aquarium rim.
Secure the set screws: Tighten carefully to stabilize the fixture without damaging the aquarium.
Adjust the gooseneck: Bend the flexible arm to position the light above the desired area.
Set the mounting height: Hygger recommends approximately 5–7 inches above the water surface.
Check ventilation: Ensure the cooling fan and air vents are unobstructed.
Connect the power cables: Join the lamp and adapter connectors securely.
Position the controller: Keep the controller outside the aquarium and away from splashing water.
Connect the power adapter: Plug the adapter into an appropriate electrical outlet.
Turn on the light: Use the external controller.
Select a lighting mode: Choose Blue, Blue + White, or Full Spectrum White.
Adjust the brightness: Select the appropriate intensity for the aquarium.
Set the timer: Choose the desired preset lighting period.
Observe coral response: Monitor coral extension, coloration, and signs of excessive illumination.
Make gradual adjustments: Modify intensity or positioning carefully when necessary.
Recommended Mounting Height
Hygger recommends installing the HG171 approximately:
5–7 inches / 12.7–17.8 cm above the aquarium water surface
This provides a useful starting point for light distribution and penetration.
Lower Mounting Positions
A lower position generally creates more concentrated light over a smaller area.
Higher Mounting Positions
Raising the light generally increases coverage while reducing light intensity at a given location.
Avoid Excessive Splashing
Keep the fixture away from areas where saltwater splashes can reach the light housing or fan vents.
Check Coral Placement
Corals near the top of the aquarium may receive substantially more light than corals near the substrate.
Tips for Successful Reef Lighting
Maintain a Consistent Photoperiod
Use the built-in timer to establish a predictable daily lighting period.
Acclimate Corals Gradually
Avoid sudden changes in brightness when upgrading from a weaker light.
Consider Coral PAR Requirements
Different corals have different lighting needs.
Monitor Coral Behavior
Observe tissue appearance, polyp extension, and changes in coloration.
Maintain Stable Water Chemistry
Lighting works best alongside stable reef aquarium parameters.
Keep the Water Clear
Clear aquarium water improves light transmission.
Maintain Proper Cooling
Ensure the fan operates normally and remains unobstructed.
Avoid Excessive Lighting
More light is not always better.
Excessive intensity can stress corals and contribute to aquarium imbalance.
Maintenance and Cleaning Guidelines
Regular maintenance helps preserve lighting performance and extend the life of the HG171.
Disconnect Power Before Cleaning
Always unplug the fixture before maintenance.
Allow the Light to Cool
Wait until the aluminum housing has cooled before handling it.
Clean the Exterior
Use a soft, dry cloth to remove dust and residue.
Remove Salt Spray
Carefully clean salt residue from accessible exterior surfaces using a lightly dampened cloth, keeping moisture away from electrical openings.
Inspect the Cooling Fan
Check the fan and ventilation openings for dust or salt accumulation.
Clean the Optical Lens
Use a soft, nonabrasive cloth to remove surface residue.
Inspect the Gooseneck
Check the mounting arm for secure positioning.
Check the Clamp
Ensure the mounting screws remain properly tightened.
Inspect the Power Cable
Do not use the fixture if the cable or adapter is damaged.
Keep Electrical Components Dry
Never immerse the light, controller, or power adapter in water.
Troubleshooting Guide
Light Does Not Turn On
Check the power outlet.
Confirm the adapter and lamp connectors are secure.
Check the controller's power setting.
Light Is Too Dim
Increase the brightness setting.
Check the selected lighting mode.
Confirm that the fixture is positioned correctly.
Coral Fluorescence Appears Weak
Try Blue Mode.
Check whether the selected corals contain fluorescent pigments.
Aquarium Coverage Is Uneven
Reposition the gooseneck.
Adjust the mounting height.
Consider supplemental lighting if the aquarium is wider than the fixture's effective coverage.
Cooling Fan Is Noisy
Check for dust or salt buildup around the ventilation openings.
Ensure the fixture has adequate airflow.
Disconnect power if the fan appears damaged.
Timer Does Not Match the Expected Schedule
Check the selected timer setting and the markings on your controller.
Review the supplied manual for the specific timer configuration.
Corals Appear Stressed
Reduce brightness.
Review the lighting duration and coral placement.
Check water chemistry and other aquarium conditions.
Light Housing Becomes Excessively Hot
Ensure the cooling fan is operating.
Check that the air vents are not blocked.
Disconnect power if overheating is suspected.
Important Safety Guidelines
The HG171 is an above-aquarium lighting fixture.
Do not submerge the light.
Keep the controller and power adapter dry.
Prevent saltwater splashes from reaching the fan and electrical connections.
Do not block the cooling fan or ventilation openings.
Disconnect power before cleaning or adjusting electrical components.
Allow the housing to cool before handling.
Do not operate the light with a damaged power cord.
Use only a compatible power adapter.
Secure the mounting bracket properly.
Do not overtighten mounting screws against aquarium glass.
Use a drip loop in electrical cables.
Use an appropriately protected electrical outlet.
Avoid looking directly into the illuminated LEDs.
Keep the equipment away from young children.
Follow the manufacturer's installation and operating instructions.
Product Specifications
Brand: Hygger
Product Name: Eyeball Aluminum Alloy Reef Light
Model: HG171-36W / HG171
Product Type: Full-Spectrum LED Saltwater Aquarium Reef Light
Power Consumption: 36W
Recommended Aquarium Length: 16–20 Inches / 40–50 cm
Total LED Quantity: 30
White LEDs: 3 × 6700K
Blue LEDs: 12 × 453 nm
Royal Blue LEDs: 10 × 465 nm
Violet LEDs: 2 × 415 nm
UV LEDs: 2 × 395 nm
Red LEDs: 1 × 660 nm
Lighting Modes: Blue, Blue + White, and Full Spectrum White
Brightness Levels: 10%, 32%, 55%, 77%, and 100%
Controller: External Digital Lighting Controller
Timer: Three Preset Timer Durations
Automatic Timer Operation: Yes
Independent RGB Channel Programming: No
Light Head Diameter: 3.58 Inches / 9.1 cm
Gooseneck Height: Approximately 13.4 Inches / 34 cm
Gooseneck Adjustment: 360-Degree Flexible Positioning
Housing Material: Aluminum Alloy
Cooling System: Ball-Bearing Fan and Multi-Fin Aluminum Heat Sink
Manufacturer-Rated Noise Level: Below 35 dB
Manufacturer-Estimated Fan Service Life: Approximately 60,000–100,000 Hours
Optical Coverage: Up to Approximately 24 × 24 Inches Under Suitable Conditions
Recommended Mounting Height: 5–7 Inches Above Water
Mounting Type: Adjustable Clamp Bracket
Aquarium Compatibility: Many Rimmed and Rimless Tanks
Maximum Mounting Thickness: Approximately 0.95 Inches / 2.4 cm According to the User Manual
Power Input: AC 100–240V / 50–60Hz
Operating Output Voltage: DC 12V
Power Cord Length: Approximately 5 ft + 2.2 ft / 1.5 m + 0.7 m
Installation Type: Above-Aquarium
Submersible: No
Primary Application: Saltwater and Reef Aquarium Lighting
Recommended Coral Types: Compatible Soft Corals and LPS Corals
SPS Coral Applications: Additional Fixtures May Be Required
Manufacturer-Published PAR Measurements
At 7 Inches: 431 µmol/m²/s
At 12 Inches: 182 µmol/m²/s
At 16 Inches: 137 µmol/m²/s
At 19 Inches: 93 µmol/m²/s
Specifications are based on Hygger's published HG171 product information and official user manual. Timer documentation differs regarding the shortest preset, so customers should follow the markings and instructions supplied with their unit. PAR measurements and coverage depend on testing conditions and should not be interpreted as guaranteed performance throughout every aquarium.
Package Includes
The reef light includes its adjustable gooseneck and mounting bracket assembly.
Powerful Full-Spectrum Lighting for Beautiful Nano Reefs
The Hygger Eyeball Aluminum Alloy Reef Light HG171-36W is an excellent choice for saltwater aquarium enthusiasts who want vibrant coral colors, adjustable lighting intensity, and dependable reef illumination in a compact fixture.
With 30 high-efficiency LEDs, three selectable lighting modes, five brightness settings, and a convenient timer, the HG171 makes it easy to customize lighting for compatible soft coral, LPS coral, and marine fish aquariums.
Its flexible 360-degree gooseneck allows precise positioning, while the premium aluminum alloy housing and upgraded ball-bearing fan help maintain reliable cooling performance.
The combination of blue, royal blue, violet, UV, white, and red LEDs creates attractive reef lighting that enhances fluorescent coral pigmentation and highlights the natural beauty of marine aquascapes.
Whether you're starting a nano reef, upgrading a small saltwater aquarium, or illuminating a collection of colorful corals, the Hygger HG171-36W offers a practical balance of powerful lighting, convenient control, and elegant design.
Order the Hygger Eyeball Aluminum Alloy Reef Light HG171-36W today and bring brilliant coral fluorescence, customizable full-spectrum illumination, and professional-style reef lighting to your aquarium.
For 16-20-Inch-long Aquariums!
Order processing time: 3–5 business days
Bring the vibrant colors and natural brilliance of a coral reef to your aquarium with the Hygger Eyeball Aluminum Alloy Reef Light HG171-36W, a compact yet powerful full-spectrum LED saltwater aquarium light designed for nano reef tanks, soft corals, LPS corals, marine fish, and carefully planned mixed reef aquariums. Featuring 30 high-efficiency LEDs, three selectable lighting modes, five adjustable brightness levels, a built-in timer, and a flexible 360-degree gooseneck mounting system, the Hygger HG171 delivers customizable reef illumination in a sleek, space-saving design.
Engineered for 16–20 inch marine aquariums, this 36W reef light combines blue, royal blue, violet, UV, white, and red LEDs to create a balanced spectrum that enhances coral fluorescence and supports the photosynthetic needs of compatible reef organisms. Its compact eyeball-style light head produces concentrated illumination while a specially designed optical lens helps distribute light throughout the aquarium.
The HG171 also features a premium aluminum alloy housing, an upgraded ball-bearing cooling fan, and an adjustable mounting bracket compatible with many rimmed and rimless aquariums. The external controller makes it easy to customize lighting intensity, select your preferred color combination, and establish a consistent daily lighting schedule.
Whether you're building your first nano reef aquarium, illuminating a collection of colorful zoanthids, maintaining LPS corals, or upgrading the lighting above a marine display, the Hygger HG171-36W offers an excellent combination of performance, flexibility, and attractive reef lighting.
Benefits of the Hygger Eyeball Aluminum Alloy Reef Light HG171-36W
Powerful 36W Reef LED Lighting: Provides concentrated illumination for compatible nano reef and marine aquariums.
30 Full-Spectrum LEDs: Combines six LED color types to support coral viewing and photosynthesis.
Designed for 16–20 Inch Aquariums: Ideal for many compact saltwater and nano reef setups.
Enhanced Coral Fluorescence: Blue, royal blue, and violet lighting helps reveal vibrant fluorescent coral pigments.
Three Selectable Lighting Modes: Choose Blue, Blue + White, or Full Spectrum White.
Five Brightness Levels: Adjust intensity to 10%, 32%, 55%, 77%, or 100%.
Built-In Lighting Timer: Automates daily lighting periods without requiring a separate timer.
360-Degree Flexible Gooseneck: Easily adjust the position and angle of the light.
Compact Eyeball-Style Design: Delivers powerful illumination without a bulky overhead fixture.
Advanced Optical Lens: Helps provide balanced light distribution and useful penetration.
High PAR Performance: Manufacturer-published measurements demonstrate substantial light output at different distances.
Premium Aluminum Alloy Housing: Durable construction designed for efficient heat dissipation.
Upgraded Ball-Bearing Cooling Fan: Helps manage operating temperature during extended use.
Quiet Cooling Design: Manufacturer-rated operating noise below 35 dB.
Rimmed and Rimless Aquarium Compatibility: Secure mounting with an adjustable bracket.
Easy Installation: Convenient clamp-style mounting without drilling or permanent aquarium modifications.
Full-Spectrum LED Lighting for Coral Reef Aquariums
The Hygger HG171-36W uses a carefully selected combination of LEDs designed for marine aquarium lighting.
Unlike standard freshwater aquarium lights, the HG171 emphasizes blue and violet wavelengths commonly used in reef lighting.
These wavelengths are particularly important for illuminating the fluorescent pigments found in many corals.
30 High-Efficiency LED Beads
The HG171 contains:
This combination provides a broad lighting spectrum with a strong emphasis on blue wavelengths.
White LEDs for Natural Viewing
The 6700K white LEDs contribute to a brighter, more natural-looking aquarium appearance.
They help display the details of live rock, fish, coral structures, and substrate.
Blue and Royal Blue LEDs
The 453 nm and 465 nm LEDs provide the blue-rich lighting commonly associated with marine aquariums.
These wavelengths contribute to photosynthetically useful light and can make fluorescent coral pigments appear more vibrant.
Violet and Near-UV LEDs
The 395 nm and 415 nm LEDs contribute additional short-wavelength illumination.
They can enhance the appearance of certain fluorescent coral pigments.
Red LED
The 660 nm red LED adds a longer-wavelength component to the overall spectrum.
It also contributes to the visual appearance of marine fish and coral coloration.
Beautiful Coral Fluorescence and Color Enhancement
One of the most attractive features of the Hygger HG171 is its ability to highlight fluorescent coral coloration.
Many reef corals contain pigments that absorb certain wavelengths of light and emit visible fluorescence.
Blue-rich aquarium lighting can make these pigments appear especially vivid.
Zoanthid Coral Displays
Blue and violet illumination can help highlight the bright colors and fluorescent patterns of zoanthids.
Mushroom Corals
Many mushroom corals display attractive coloration under suitable reef lighting.
LPS Corals
The HG171 can enhance the appearance of compatible LPS corals, including colorful fleshy coral varieties.
Soft Coral Aquariums
The adjustable spectrum allows users to create attractive viewing conditions for compatible soft coral displays.
Marine Fish Coloration
The combination of blue and white lighting helps reveal the patterns and colors of saltwater fish.
Reef Aquascaping
The concentrated light helps create attractive highlights and shadows across live rock and coral formations.
Actual coral coloration depends on coral species, pigmentation, water chemistry, and overall aquarium conditions.
Three Adjustable Reef Lighting Modes
The HG171 features three selectable lighting modes.
These allow aquarium owners to choose between blue-dominant lighting and brighter full-spectrum illumination.
Mode 1: Blue Light
Blue Mode emphasizes the fixture's blue-rich lighting.
Benefits include:
Enhanced coral fluorescence
Attractive blue reef appearance
Increased visibility of fluorescent pigments
Decorative evening-style aquarium viewing
Blue Mode is useful when you want to highlight the vivid fluorescent colors of compatible corals.
Mode 2: Blue + White Light
Blue + White Mode combines blue illumination with white light.
This produces a brighter, more balanced reef appearance.
Benefits include:
Clearer viewing of fish and coral structures
Balanced blue and white illumination
Attractive coloration for everyday viewing
Improved visibility of live rock and aquarium decorations
This mode is a practical choice for many routine reef aquarium lighting applications.
Mode 3: Full Spectrum White Light
Full Spectrum White Mode provides a brighter, more natural-looking lighting appearance.
Benefits include:
Daylight-style reef illumination
Improved visibility during aquarium maintenance
Clear viewing of coral structures
Attractive presentation of marine fish and aquascaping details
Select the lighting mode that best matches your aquarium's inhabitants and viewing preferences.
Five Adjustable Brightness Levels
The Hygger HG171 allows users to customize lighting intensity through its external controller.
The five available brightness settings are:
10% Brightness: Low-intensity illumination for gentle viewing or acclimation.
32% Brightness: Reduced lighting for sensitive or newly introduced corals.
55% Brightness: Moderate illumination for compatible reef setups.
77% Brightness: Increased intensity for aquariums requiring stronger lighting.
100% Brightness: Maximum available output for suitable aquarium conditions.
Gradual Coral Acclimation
When introducing a new reef light, it is important to avoid sudden increases in illumination.
Begin with a lower brightness setting and increase gradually as appropriate.
Adjust for Aquarium Depth
Deeper aquariums may require greater light intensity to reach lower coral placements.
Adjust for Coral Species
Different corals have different lighting requirements.
Soft corals, LPS corals, and SPS corals should not automatically receive the same intensity.
Control Excessive Lighting
Reducing brightness can help prevent excessive light exposure when a fixture is installed close to the water surface.
Built-In Timer for Consistent Daily Lighting
The HG171 includes a convenient timer function that allows aquarium owners to automate the daily lighting schedule.
A consistent lighting period is important for reef aquarium stability and for avoiding unnecessary changes in light exposure.
Convenient Automatic Operation
The timer turns the light off after the selected operating period.
Three Preset Timer Options
Hygger's published materials describe three preset timer settings. The product page and other manufacturer materials differ on the shortest preset, listing either 3 or 6 hours, alongside 9 and 12 hours.
Refer to the timer markings on your supplied controller and its accompanying manual for the exact settings.
Consistent Lighting Schedule
A regular photoperiod helps establish predictable lighting conditions.
Reduced Manual Switching
The timer allows users to avoid turning the light on and off manually every day.
Lighting Duration Considerations
The appropriate daily photoperiod depends on coral species, light intensity, and the aquarium's overall condition.
Many reef aquarium lighting schedules use approximately 6–12 hours of total illumination, although individual coral requirements vary.
Important: The HG171 provides preset lighting modes and timer control. It is not advertised as having independently programmable RGB channels or a fully customizable sunrise-to-sunset ramping schedule.
Manufacturer-Published PAR Performance
PAR, or photosynthetically active radiation, describes the portion of light useful for photosynthesis.
Reef aquarium lighting is often evaluated using PAR measurements because corals contain photosynthetic symbiotic organisms that rely on appropriate illumination.
The Hygger HG171 has published PAR readings measured at several distances.
<text> </text>
PAR at 7 Inches
431 µmol/m²/s
This demonstrates the fixture's concentrated output at a relatively short measurement distance.
PAR at 12 Inches
182 µmol/m²/s
This indicates a moderate-to-strong measured light intensity at this distance.
PAR at 16 Inches
137 µmol/m²/s
This demonstrates useful light penetration farther from the fixture.
PAR at 19 Inches
93 µmol/m²/s
This shows the light output at the longest manufacturer-published measurement distance.
Important PAR Considerations
These figures are manufacturer-published measurements under specific test conditions.
Actual PAR in your aquarium will vary depending on:
The listed PAR readings should not be interpreted as guaranteed measurements at every point in the aquarium.
For demanding corals, a PAR meter can help verify actual light intensity.
Designed for 16–20 Inch Nano Reef Aquariums
The Hygger HG171-36W is specifically marketed for marine aquariums approximately:
16–20 inches / 40–50 cm long
Its compact light head and flexible mounting system make it a practical choice for smaller reef displays.
Nano Reef Aquariums
The HG171 is well suited to compatible compact marine aquariums.
Small Mixed Reef Displays
The adjustable spectrum and brightness make it useful for carefully planned mixed coral aquariums.
Soft Coral Aquariums
The light is particularly suitable for compatible soft coral systems.
LPS Coral Aquariums
The HG171 is also designed for compatible LPS coral reef setups.
SPS Coral Considerations
Some SPS corals require more intense and consistent illumination than a single compact fixture can provide.
Hygger recommends using two HG171 lights for certain SPS coral applications.
The appropriate number of fixtures depends on coral placement, aquarium depth, and measured PAR.
Wide-Angle Optical Lens for Reef Coverage
The HG171 uses a specially designed optical lens to distribute light across the aquarium.
The manufacturer describes coverage reaching up to approximately 24 × 24 inches under suitable conditions.
Balanced Light Distribution
The lens helps spread illumination across the reef display.
Reduced Harsh Spotlighting
A broader beam can help soften the difference between the brightest central area and surrounding regions.
Useful Light Penetration
The concentrated 36W output helps deliver light through the aquarium water column.
Attractive Aquascape Appearance
The light creates highlights and shadows that add depth to reef structures.
Coverage Versus Recommended Aquarium Size
Although Hygger describes optical coverage up to 24 × 24 inches, its recommended aquarium length for the HG171 is 16–20 inches.
The larger coverage figure should not be interpreted as a guarantee of sufficient coral-growing PAR across a 24-inch aquarium.
360-Degree Flexible Gooseneck Mount
The Hygger HG171 includes a flexible gooseneck mounting system that allows users to adjust the position and angle of the light.
Flexible Positioning
Bend the gooseneck to direct illumination toward the desired area.
360-Degree Adjustment
The mounting arm allows flexible positioning around the aquarium.
Targeted Coral Lighting
Adjust the light to illuminate selected coral structures or aquascaping features.
Compact Installation
The gooseneck design avoids the need for a large overhead fixture.
Convenient Aquarium Access
The flexible arm can be repositioned to provide access for aquarium feeding and maintenance.
Gooseneck Height
The manufacturer describes the adjustable gooseneck as approximately:
13.4 inches / 34 cm
The exact usable mounting height depends on bracket positioning and the selected bend.
Premium Aluminum Alloy Housing
The HG171 features a durable aluminum alloy light housing designed for long-term aquarium use.
Efficient Heat Dissipation
Aluminum conducts heat efficiently, helping transfer heat away from the LED components.
Multi-Fin Cooling Design
The housing incorporates a multi-fin structure that increases the surface area available for heat dissipation.
Durable Construction
The aluminum alloy housing provides a sturdy exterior.
Corrosion-Resistant Finish
The mounting components feature an anti-rust design intended for marine aquarium environments.
Compact Light Head
The eyeball-style light head measures approximately:
3.58 inches / 9.1 cm in diameter
This compact design helps keep the fixture visually unobtrusive above the aquarium.
Upgraded Ball-Bearing Cooling Fan
High-output LED lighting produces heat during operation.
The Hygger HG171 includes an upgraded ball-bearing cooling fan designed to help maintain suitable operating temperatures.
Active Cooling
The fan moves air through the light housing to remove heat.
Ball-Bearing Design
The upgraded fan uses ball bearings to reduce friction during rotation.
Efficient Thermal Management
The combination of active airflow and aluminum cooling fins helps maintain stable operating conditions.
Low-Noise Operation
Hygger describes the fixture as operating below approximately:
35 dB
Actual sound levels depend on the installation environment, fan condition, and surrounding noise.
Manufacturer-Estimated Fan Life
Hygger describes the ball-bearing cooling system as having an estimated service life of approximately 60,000–100,000 hours.
This is a component-life estimate, not a guarantee that the entire lighting fixture will operate for that period.
Proper Ventilation
Keep the fan vents unobstructed and avoid installing the fixture in an enclosed space without adequate airflow.
Compatible with Rimmed and Rimless Aquariums
The HG171 includes an adjustable mounting bracket designed to fit many aquarium configurations.
Rimless Aquariums
The clamp can attach to compatible rimless glass aquariums.
Rimmed Aquariums
The bracket is also designed to accommodate many aquarium rims.
Adjustable Clamp
The mounting system allows adjustment for different aquarium wall thicknesses.
Aquarium Thickness Compatibility
Hygger's official user manual specifies a maximum mounting thickness of approximately:
0.95 inches / 2.4 cm
The manufacturer also describes compatibility with aquarium glass or rim thicknesses starting around 0.2 inches.
Secure Installation
The bracket includes set screws that help hold the light in position.
Important Compatibility Note
Measure the aquarium's rim or mounting surface before installation.
Unusually shaped or heavily reinforced aquarium rims may not fit the bracket even if their thickness is within the stated range.
Suitable for Soft Coral Aquariums
The HG171 is specifically recommended by Hygger for soft coral reef systems.
Soft corals are popular among reef aquarium enthusiasts because many species are relatively adaptable when provided with suitable water quality, lighting, and circulation.
Zoanthids
The blue-rich spectrum can enhance the fluorescent appearance of colorful zoanthid colonies.
Mushroom Corals
Many mushroom corals can be maintained under moderate reef lighting when positioned appropriately.
Leather Corals
Compatible leather coral species can benefit from suitable illumination and stable aquarium conditions.
Green Star Polyps
Green Star Polyps can display attractive fluorescence under blue-rich lighting.
Other Soft Corals
The HG171 may be suitable for additional soft coral species when their individual lighting requirements are met.
Always consider the coral's preferred PAR range rather than relying only on coral category.
Suitable for LPS Coral Aquariums
The HG171 is also designed for compatible large-polyp stony coral systems.
LPS corals are valued for their colorful tissues, interesting structures, and movement.
Duncan Corals
Duncan corals can be suitable for appropriately lit reef aquariums.
Candy Cane Corals
Candy Cane corals often display attractive coloration under balanced reef lighting.
Hammer Corals
Compatible hammer coral varieties can be maintained under suitable lighting and water movement.
Frogspawn Corals
Frogspawn corals can create attractive movement and color in a reef aquarium.
Acan Corals
Many Acan coral varieties show vivid fluorescent pigmentation under blue-rich light.
Coral Placement
Position each coral according to its lighting requirements and gradually acclimate it to the HG171.
SPS Coral Lighting Considerations
Small-polyp stony corals often require more demanding lighting and aquarium conditions.
The Hygger HG171 can contribute to SPS coral illumination, but one fixture may not provide sufficient coverage or intensity for every SPS aquarium.
Additional Lighting May Be Required
Hygger recommends two lights for some SPS coral applications.
PAR Verification
Use measured PAR values when selecting coral placement.
Stable Aquarium Conditions
SPS coral health also depends on stable alkalinity, calcium, magnesium, salinity, nutrients, and water movement.
Gradual Acclimation
Avoid introducing SPS corals directly into high-intensity lighting without an appropriate acclimation process.
Enhance Marine Fish and Live Rock Displays
The HG171 is not limited to coral-focused visual enhancement.
It also provides attractive illumination for compatible saltwater fish aquariums.
Marine Fish
The full-spectrum output helps display fish coloration and patterns.
Live Rock Aquascapes
The concentrated lighting creates shadows and highlights across live rock structures.
Decorative Reef Displays
The three lighting modes allow users to change the visual appearance of the aquarium.
Coral Frag Displays
The compact fixture may be useful for compatible small coral frag setups when the required light intensity is verified.
Suitable Aquarium Applications
The Hygger Eyeball Aluminum Alloy Reef Light HG171-36W is suitable for:
Nano reef aquariums
16–20 inch saltwater aquariums
Soft coral reef tanks
LPS coral aquariums
Compatible mixed reef systems
Zoanthid displays
Mushroom coral aquariums
Marine fish tanks
Live rock aquascapes
Small coral frag displays
Rimmed marine aquariums
Rimless reef aquariums
Aquariums requiring adjustable blue-rich lighting
Reef systems requiring compact overhead illumination
Supplemental lighting for selected coral applications
The HG171 is designed primarily for saltwater and reef aquarium use.
How to Choose the Best Lighting Mode
For Coral Fluorescence
Choose Blue Mode to emphasize fluorescent pigments.
For Everyday Reef Viewing
Choose Blue + White Mode for a balanced combination of brightness and coral color.
For Natural-Looking Illumination
Choose Full Spectrum White Mode for a brighter daylight-style appearance.
For Newly Introduced Corals
Begin at a lower brightness setting and increase gradually.
For Deeper Coral Placement
Evaluate whether additional brightness or supplemental lighting is required.
For Sensitive Corals
Avoid excessive light intensity and position corals according to their individual requirements.
Installation and Usage Guidelines
Inspect the package: Check the light head, mounting bracket, controller, adapter, and set screws.
Confirm aquarium compatibility: Ensure the aquarium is approximately 16–20 inches long and has a suitable mounting rim.
Choose the mounting location: Select a stable position along the aquarium wall.
Attach the bracket: Position the clamp on the aquarium rim.
Secure the set screws: Tighten carefully to stabilize the fixture without damaging the aquarium.
Adjust the gooseneck: Bend the flexible arm to position the light above the desired area.
Set the mounting height: Hygger recommends approximately 5–7 inches above the water surface.
Check ventilation: Ensure the cooling fan and air vents are unobstructed.
Connect the power cables: Join the lamp and adapter connectors securely.
Position the controller: Keep the controller outside the aquarium and away from splashing water.
Connect the power adapter: Plug the adapter into an appropriate electrical outlet.
Turn on the light: Use the external controller.
Select a lighting mode: Choose Blue, Blue + White, or Full Spectrum White.
Adjust the brightness: Select the appropriate intensity for the aquarium.
Set the timer: Choose the desired preset lighting period.
Observe coral response: Monitor coral extension, coloration, and signs of excessive illumination.
Make gradual adjustments: Modify intensity or positioning carefully when necessary.
Recommended Mounting Height
Hygger recommends installing the HG171 approximately:
5–7 inches / 12.7–17.8 cm above the aquarium water surface
This provides a useful starting point for light distribution and penetration.
Lower Mounting Positions
A lower position generally creates more concentrated light over a smaller area.
Higher Mounting Positions
Raising the light generally increases coverage while reducing light intensity at a given location.
Avoid Excessive Splashing
Keep the fixture away from areas where saltwater splashes can reach the light housing or fan vents.
Check Coral Placement
Corals near the top of the aquarium may receive substantially more light than corals near the substrate.
Tips for Successful Reef Lighting
Maintain a Consistent Photoperiod
Use the built-in timer to establish a predictable daily lighting period.
Acclimate Corals Gradually
Avoid sudden changes in brightness when upgrading from a weaker light.
Consider Coral PAR Requirements
Different corals have different lighting needs.
Monitor Coral Behavior
Observe tissue appearance, polyp extension, and changes in coloration.
Maintain Stable Water Chemistry
Lighting works best alongside stable reef aquarium parameters.
Keep the Water Clear
Clear aquarium water improves light transmission.
Maintain Proper Cooling
Ensure the fan operates normally and remains unobstructed.
Avoid Excessive Lighting
More light is not always better.
Excessive intensity can stress corals and contribute to aquarium imbalance.
Maintenance and Cleaning Guidelines
Regular maintenance helps preserve lighting performance and extend the life of the HG171.
Disconnect Power Before Cleaning
Always unplug the fixture before maintenance.
Allow the Light to Cool
Wait until the aluminum housing has cooled before handling it.
Clean the Exterior
Use a soft, dry cloth to remove dust and residue.
Remove Salt Spray
Carefully clean salt residue from accessible exterior surfaces using a lightly dampened cloth, keeping moisture away from electrical openings.
Inspect the Cooling Fan
Check the fan and ventilation openings for dust or salt accumulation.
Clean the Optical Lens
Use a soft, nonabrasive cloth to remove surface residue.
Inspect the Gooseneck
Check the mounting arm for secure positioning.
Check the Clamp
Ensure the mounting screws remain properly tightened.
Inspect the Power Cable
Do not use the fixture if the cable or adapter is damaged.
Keep Electrical Components Dry
Never immerse the light, controller, or power adapter in water.
Troubleshooting Guide
Light Does Not Turn On
Check the power outlet.
Confirm the adapter and lamp connectors are secure.
Check the controller's power setting.
Light Is Too Dim
Increase the brightness setting.
Check the selected lighting mode.
Confirm that the fixture is positioned correctly.
Coral Fluorescence Appears Weak
Try Blue Mode.
Check whether the selected corals contain fluorescent pigments.
Aquarium Coverage Is Uneven
Reposition the gooseneck.
Adjust the mounting height.
Consider supplemental lighting if the aquarium is wider than the fixture's effective coverage.
Cooling Fan Is Noisy
Check for dust or salt buildup around the ventilation openings.
Ensure the fixture has adequate airflow.
Disconnect power if the fan appears damaged.
Timer Does Not Match the Expected Schedule
Check the selected timer setting and the markings on your controller.
Review the supplied manual for the specific timer configuration.
Corals Appear Stressed
Reduce brightness.
Review the lighting duration and coral placement.
Check water chemistry and other aquarium conditions.
Light Housing Becomes Excessively Hot
Ensure the cooling fan is operating.
Check that the air vents are not blocked.
Disconnect power if overheating is suspected.
Important Safety Guidelines
The HG171 is an above-aquarium lighting fixture.
Do not submerge the light.
Keep the controller and power adapter dry.
Prevent saltwater splashes from reaching the fan and electrical connections.
Do not block the cooling fan or ventilation openings.
Disconnect power before cleaning or adjusting electrical components.
Allow the housing to cool before handling.
Do not operate the light with a damaged power cord.
Use only a compatible power adapter.
Secure the mounting bracket properly.
Do not overtighten mounting screws against aquarium glass.
Use a drip loop in electrical cables.
Use an appropriately protected electrical outlet.
Avoid looking directly into the illuminated LEDs.
Keep the equipment away from young children.
Follow the manufacturer's installation and operating instructions.
Product Specifications
Brand: Hygger
Product Name: Eyeball Aluminum Alloy Reef Light
Model: HG171-36W / HG171
Product Type: Full-Spectrum LED Saltwater Aquarium Reef Light
Power Consumption: 36W
Recommended Aquarium Length: 16–20 Inches / 40–50 cm
Total LED Quantity: 30
White LEDs: 3 × 6700K
Blue LEDs: 12 × 453 nm
Royal Blue LEDs: 10 × 465 nm
Violet LEDs: 2 × 415 nm
UV LEDs: 2 × 395 nm
Red LEDs: 1 × 660 nm
Lighting Modes: Blue, Blue + White, and Full Spectrum White
Brightness Levels: 10%, 32%, 55%, 77%, and 100%
Controller: External Digital Lighting Controller
Timer: Three Preset Timer Durations
Automatic Timer Operation: Yes
Independent RGB Channel Programming: No
Light Head Diameter: 3.58 Inches / 9.1 cm
Gooseneck Height: Approximately 13.4 Inches / 34 cm
Gooseneck Adjustment: 360-Degree Flexible Positioning
Housing Material: Aluminum Alloy
Cooling System: Ball-Bearing Fan and Multi-Fin Aluminum Heat Sink
Manufacturer-Rated Noise Level: Below 35 dB
Manufacturer-Estimated Fan Service Life: Approximately 60,000–100,000 Hours
Optical Coverage: Up to Approximately 24 × 24 Inches Under Suitable Conditions
Recommended Mounting Height: 5–7 Inches Above Water
Mounting Type: Adjustable Clamp Bracket
Aquarium Compatibility: Many Rimmed and Rimless Tanks
Maximum Mounting Thickness: Approximately 0.95 Inches / 2.4 cm According to the User Manual
Power Input: AC 100–240V / 50–60Hz
Operating Output Voltage: DC 12V
Power Cord Length: Approximately 5 ft + 2.2 ft / 1.5 m + 0.7 m
Installation Type: Above-Aquarium
Submersible: No
Primary Application: Saltwater and Reef Aquarium Lighting
Recommended Coral Types: Compatible Soft Corals and LPS Corals
SPS Coral Applications: Additional Fixtures May Be Required
Manufacturer-Published PAR Measurements
At 7 Inches: 431 µmol/m²/s
At 12 Inches: 182 µmol/m²/s
At 16 Inches: 137 µmol/m²/s
At 19 Inches: 93 µmol/m²/s
Specifications are based on Hygger's published HG171 product information and official user manual. Timer documentation differs regarding the shortest preset, so customers should follow the markings and instructions supplied with their unit. PAR measurements and coverage depend on testing conditions and should not be interpreted as guaranteed performance throughout every aquarium.
Package Includes
The reef light includes its adjustable gooseneck and mounting bracket assembly.
Powerful Full-Spectrum Lighting for Beautiful Nano Reefs
The Hygger Eyeball Aluminum Alloy Reef Light HG171-36W is an excellent choice for saltwater aquarium enthusiasts who want vibrant coral colors, adjustable lighting intensity, and dependable reef illumination in a compact fixture.
With 30 high-efficiency LEDs, three selectable lighting modes, five brightness settings, and a convenient timer, the HG171 makes it easy to customize lighting for compatible soft coral, LPS coral, and marine fish aquariums.
Its flexible 360-degree gooseneck allows precise positioning, while the premium aluminum alloy housing and upgraded ball-bearing fan help maintain reliable cooling performance.
The combination of blue, royal blue, violet, UV, white, and red LEDs creates attractive reef lighting that enhances fluorescent coral pigmentation and highlights the natural beauty of marine aquascapes.
Whether you're starting a nano reef, upgrading a small saltwater aquarium, or illuminating a collection of colorful corals, the Hygger HG171-36W offers a practical balance of powerful lighting, convenient control, and elegant design.
Order the Hygger Eyeball Aluminum Alloy Reef Light HG171-36W today and bring brilliant coral fluorescence, customizable full-spectrum illumination, and professional-style reef lighting to your aquarium.
Image 1 of 5
Image 2 of 5
Image 3 of 5
Image 4 of 5
Image 5 of 5
