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 customizable time periods for 24h cycle

💡108 WRGB LEDs for vibrant full spectrum

💧IP68 waterproof & premium aluminum heat dissipation

€ 93.52

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌈 Illuminate your aquatic world with precision and style!

VIBRANT WRGB SPECTRUM - Scientifically balanced WRGB LEDs simulate natural sunlight, enhancing plant growth and making your tank sparkle.
COMPLETE SETUP INCLUDED - Everything you need—LED light, controller, adapter, adjustable brackets, and manual—ready to elevate your freshwater tank.
BUILT TO LAST SPLASH PROOF - IP68 waterproof rating with a sealed aluminum shell ensures durability and safe, energy-efficient operation.
TAILORED 24 7 LIGHTING CONTROL - Set 8 time slots with adjustable brightness & 7 vivid colors for a natural day-to-night aquarium vibe.
SMART WIRED CONTROLLER WITH LCD - Monitor real-time settings and effortlessly program your aquarium’s light cycle with intuitive buttons and clear display.

The HG999-18W is a premium 18-watt LED aquarium light featuring 108 WRGB lamp beads that deliver a full spectrum of natural light optimized for freshwater plants and fish. It offers 3 programmable modes with 8 customizable time periods, adjustable brightness from 10% to 100%, and 7 night colors. Its IP68 waterproof aluminum design ensures durability and efficient heat dissipation. The wired controller with LCD display allows precise scheduling and real-time monitoring, making it a top choice for millennial aquarium enthusiasts seeking both functionality and aesthetic appeal.

Specifications

ASIN	B09B22VK8Z
Best Sellers Rank	#15,431 in Pet Supplies ( See Top 100 in Pet Supplies ) #36 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 (2,181)
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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