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

€ 105.68

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Description

🌈 Illuminate your underwater world with precision and style!

COMPLETE PLUG PLAY SETUP - Includes LED light, wired controller, AC/DC adapter, and adjustable brackets—everything you need to elevate your 18"-24" freshwater planted tank instantly.
CUSTOM 24 7 LIGHTING CONTROL - Set up to 8 time periods with adjustable brightness and 7 color options, perfectly syncing your tank’s day and night cycle to your lifestyle.
SMART LCD CONTROLLER DISPLAY - Real-time clock, mode, brightness, and color info at your fingertips for effortless, precise lighting management.
ULTIMATE WATERPROOF DURABILITY - IP68-rated sealed aluminum shell ensures zero water damage and superior heat dissipation—built to last in humid aquatic environments.
VIVID FULL SPECTRUM BRILLIANCE - Scientifically tuned WRGB LEDs simulate natural light, enhancing plant growth and making your aquarium water sparkle with lifelike colors.

The hygger Auto On Off LED Aquarium Light features 108 WRGB LEDs delivering a flicker-free, full-spectrum light optimized for freshwater planted tanks sized 18"-24". With an IP68 waterproof rating and a premium aluminum shell, it offers robust durability and efficient heat dissipation. The advanced LCD controller allows customizable 24/7 lighting cycles with 8 programmable time slots, adjustable brightness, and 7 color modes, ensuring your aquatic ecosystem thrives with naturalistic lighting. This all-in-one kit includes everything needed for easy installation and smart aquarium illumination.

Specifications

ASIN	B09B22VK8Z
Best Sellers Rank	#16,842 in Pet Supplies ( See Top 100 in Pet Supplies ) #41 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 out of 5 stars 2,190 Reviews
Finish Type	Brushed
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	Aluminum , Shell
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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€ 105.68

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In stock

Sold byAmazon GERMANYDelivered 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 GERMANY.

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TrustScore 4.5 | 7,300+ reviews

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