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

Product ID: 367660585

Details

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

⏰8 programmable 24/7 lighting periods

💡18W full-spectrum WRGB LEDs

💧IP68 waterproof & aluminum heat dissipation

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S$82

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Description

💡 Illuminate your aquatic world with precision and style!

SMART LCD CONTROLLER - Easily monitor and adjust settings with a clear LCD display showing time, mode, brightness, and color for effortless aquarium management.
COMPLETE READY TO USE KIT - Includes LED light, wired controller, AC/DC adapter, and adjustable metal brackets—everything you need to upgrade your 18"-24" freshwater planted tank.
TAILORED 24 7 LIGHTING CYCLE - Customize up to 8 time slots with adjustable brightness and 7 vivid colors to perfectly mimic natural aquatic environments.
ULTIMATE DURABILITY SAFETY - IP68 waterproof rating with a premium aluminum shell ensures long-lasting performance even in humid, splash-prone conditions.
VIBRANT FULL SPECTRUM ILLUMINATION - WRGB lamp beads scientifically calibrated to enhance plant growth and bring out lifelike colors in your freshwater tank.

The hygger Auto On Off LED Aquarium Light is a high-performance, 18W full-spectrum lighting solution designed for 18"-24" freshwater planted tanks. Featuring WRGB lamp beads for natural color rendering, an IP68 waterproof aluminum body for durability, and a programmable 24/7 lighting cycle controlled via an intuitive LCD monitor, it promotes healthy plant growth and vibrant aquatic life. This all-in-one kit ensures easy installation and precise control, making it a top choice for aquarium enthusiasts seeking both functionality and aesthetic brilliance.

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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