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.

Hg999 18w | Desertcart Sri Lanka

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₨38079

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

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Description

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

VIVID FULL SPECTRUM BRILLIANCE - Scientifically tuned WRGB LEDs simulate natural light, enhancing plant growth and making your aquarium water sparkle with lifelike colors.
CUSTOMIZABLE 24 7 LIGHTING CYCLE - Set up to 8 time periods with adjustable brightness and 7 color options, perfectly syncing your tank’s ambiance with your lifestyle.
COMPLETE PLUG PLAY AQUARIUM UPGRADE - Includes LED light, AC/DC adapter, adjustable metal brackets, and user manual—everything you need to elevate your 18”-24” freshwater planted tank instantly.
ROCK SOLID WATERPROOF HEAT MANAGEMENT - IP68-rated sealed aluminum shell ensures durability against splashes and submersion, while efficient heat dissipation keeps your setup safe and energy-smart.
SMART LCD CONTROLLER WITH REAL TIME FEEDBACK - Monitor current time, mode, brightness, and color on an intuitive LCD screen, making adjustments effortless and precise.

The hygger Auto On Off LED Aquarium Light is a premium 18W full-spectrum lighting solution designed for 18"-24" freshwater planted tanks. Featuring 108 WRGB LEDs, an IP68 waterproof aluminum shell, and a programmable 24/7 lighting cycle with 7 color modes, it promotes healthy plant growth and vibrant aquatic visuals. The included LCD controller offers real-time monitoring and easy customization, making it a smart, durable, and energy-efficient upgrade for any aquarium enthusiast.

Specifications

ASIN	B09B22VK8Z
Best Sellers Rank	#14,720 in Pet Supplies ( See Top 100 in Pet Supplies ) #30 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 (2,155)
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 Light Sources	108
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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₨38079

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.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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