how can I use off & on only?

It's a dedicated power button. Plus the instructions come in the box will tell you how to operate the device. The automatic feature is very useful in any event though

What is the size of the light body? I want a light to put in an aquarium hoid yo replace an existing light. I need something that is 3¾x 21"

My light is 4 inch wide x. 17 inches long and about 3/8 of an inch thick. It fits nicely on a standard 10 gallon tank with about an inch on either side.

Would this light fit a 20 gallon long that isnt rimless?

If you purchase the 22 watt or the 26 watt it will fit. A warning to those wanting aquatic plants - this grows algae like crazy but every plant in every tank I have this brand of LED light on has died or is barely struggling to hold on. So I wouldn't recommend it for planted tanks.

I know I can adjust the light intensity in manual mode but can I adjust the daylight intensity when it is in auto mode so it isn't always 100%?

By auto mode, you mean S1? The brightness is one of the programming options for this mode.

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hygger Auto On Off LED Aquarium Light, Full Spectrum Fish Tank Light with LCD Monitor, 24/7 Lighting Cycle, 7 Colors, Adjustable Timer, IP68 Waterproof, 3 Modes for 18"-24" Freshwater Planted Tank

hygger Auto On Off LED Aquarium Light, Full Spectrum Fish Tank Light with LCD Monitor, 24/7 Lighting Cycle, 7 Colors, Adjustable Timer, IP68 Waterproof, 3 Modes for 18"-24" Freshwater Planted Tank

Product ID: 367660585

Details

Color
black
Finish Type
Brushed
Light Source Type
LED
Material
Aluminum Shell
Shape
Shell

⏰8 programmable time periods for 24/7 cycle

💡108 WRGB LEDs for vibrant full spectrum

💧IP68 waterproof for worry-free aquatic use

₨41644

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Description

🌈 Illuminate your underwater world with precision and style—because your aquatic ecosystem deserves the spotlight!

SMART LCD CONTROLLER DISPLAY - Real-time clock, mode, brightness, and color info at your fingertips for effortless, precise aquarium lighting management.
COMPLETE READY TO INSTALL KIT - Includes LED light, wired controller, AC/DC adapter, and adjustable metal brackets—everything to elevate your freshwater tank instantly.
TAILORED 24 7 LIGHTING CONTROL - Customize 8 time slots with adjustable brightness and 7 color options for day and night modes—your tank’s personal light show.
VIVID FULL SPECTRUM BRILLIANCE - 108 advanced WRGB LEDs simulate natural light to boost plant growth and reveal true aquatic colors.
ROCK SOLID WATERPROOF HEAT MANAGEMENT - IP68 rating and premium aluminum shell ensure durability and silent, energy-efficient operation without overheating.

The hygger Auto On Off LED Aquarium Light is a cutting-edge, full-spectrum lighting solution designed for 18"-24" freshwater planted tanks. Featuring 108 WRGB LEDs, an IP68 waterproof rating, and a programmable 24/7 lighting cycle with 7 color modes, it promotes healthy plant growth and vibrant aquatic life. The included LCD controller offers intuitive control over brightness, color, and timing, while the durable aluminum shell ensures efficient heat dissipation and long-lasting performance.

Specifications

ASIN	B09B22VK8Z
Best Sellers Rank	#16,762 in Pet Supplies ( See Top 100 in Pet Supplies ) #42 in Aquarium Lights
Brand Name	hygger
Bulb Base	GU10
Color	black,multi-color
Color Rendering Index	89
Color Temperature	6800 Kelvin
Customer Reviews	4.4 4.4 out of 5 stars (2,186)
Finish Types	Brushed
Item Weight	0.7 kg
Light Source Special Features	full-spectrum, IC memorizer, power-off memory, WRGB lamp beads, programmable, LCD monitor, waterproof, heat dissipation, three programmable usage modes
Light Source Type	LED
Light Source Wattage	18 watts
Manufacturer	hygger
Material Type	Aluminum,Shell
Maximum Compatible Light Source Wattage	18 watts
Model Number	HGH999
Mounting Type	metal brackets
Number of Items	1
Number of Light Sources	108
Number of Packs	1
Power Source	Corded Electric
Set Name	hygger LED Aquarium Light Set
Shade Material	Aluminum, Metal
Shape	Shell
Specification Met	IP68
Style Name	Fine
Unit Count	1 Count
Wattage	18 watts

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₨41644

Duties & taxes included

In stock

Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Sri Lanka.

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TrustScore 4.5 | 7,300+ reviews

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