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 Belgium

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💡 Illuminate your aquatic world with precision and style—never miss a moment of brilliance!

COMPLETE PLUG PLAY KIT - Includes LED light, wired controller, AC/DC adapter, and adjustable metal brackets—everything you need to elevate your freshwater tank.
INTUITIVE LCD CONTROLLER - Monitor real-time settings including mode, brightness, and timer on a sleek display for effortless control.
ADVANCED WRGB LED TECHNOLOGY - Scientifically calibrated lamp beads promote lush plant growth and make your aquarium water sparkle with lifelike colors.
TAILORED 24 7 LIGHTING CYCLE - Customize 8 time periods with adjustable brightness and 7 vibrant colors to mimic natural aquatic environments perfectly.
ULTIMATE DURABILITY SAFETY - IP68 waterproof rating plus a premium aluminum shell ensures worry-free use even in humid or splash-prone setups.

The hygger Auto On Off LED Aquarium Light is a cutting-edge 18W full-spectrum lighting solution designed for 18"-24" freshwater planted tanks. Featuring WRGB lamp beads for natural light simulation, an IP68 waterproof aluminum shell for durability, and a programmable 24/7 timer with 7 color modes, it ensures optimal plant growth and stunning visual clarity. The included LCD controller offers intuitive real-time monitoring and customization, making it a must-have for millennial aquarium enthusiasts seeking both performance and style.

Specifications

ASIN	B09B22VK8Z
Batteries are Included	No
Best Sellers Rank	#16,210 in Pet Supplies ( See Top 100 in Pet Supplies ) #38 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 (468)
Finish Types	Brushed
Item Weight	0.7 Kilograms
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	48
Power Source	Corded Electric
Set Name	hygger LED Aquarium Light Set
Shade Material	Aluminum, Metal
Shape	Shell
Smart Home Compatibility	Not Smart Home Compatible
Specification Met	IP68
Style Name	Fine
Unit Count	1.0 Count
Wattage	18 watts

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€ 109.18

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In stock

Sold byAmazon BelgiumDelivered 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 Belgium.

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HG999-18W

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