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 (Corded Electric) (Volts) (Multicolor)

hygger Auto On Off LED Aquarium Light, Full Spectrum Fish Tank Light with LCD Monitor, 24/7 Lighting (Corded Electric) (Volts) (Multicolor)

Product ID: 434805694

Details

Colour
black
Finish Type
Polished
Light Source Type
LED
Material
Aluminium
Shape
Rectangular

⏰8 programmable time periods for 24/7 custom lighting

💡108 WRGB LEDs for vibrant full-spectrum lighting

💧IP68 waterproof & aluminum shell for durability & heat dissipation

€ 161.92

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Description

🐠 Illuminate your underwater world with precision and style!

SMART LCD CONTROLLER - Intuitive wired controller with clock and LCD display lets you monitor and adjust settings effortlessly, keeping your aquarium lighting on point.
COMPLETE SETUP INCLUDED - Everything you need—LED light, AC/DC adapter, adjustable brackets, and manual—ready to elevate your aquarium experience from day one.
BUILT TO BRAVE WATER HEAT - IP68 waterproof rating and premium aluminum shell ensure long-lasting performance with efficient heat dissipation—no fan, no fuss.
TAILORED 24 7 LIGHTING CONTROL - Customize up to 8 time slots with adjustable brightness and color modes, perfectly syncing your tank’s day and night cycle.
VIVID FULL SPECTRUM BRILLIANCE - Scientifically tuned WRGB LEDs simulate natural light, enhancing plant growth and making your aquarium sparkle with lifelike colors.

The hygger Auto On Off LED Aquarium Light features 108 WRGB LEDs delivering full-spectrum lighting optimized for freshwater aquariums. With 8 programmable time periods, an intuitive LCD controller, and IP68 waterproof aluminum design, it offers customizable, durable, and energy-efficient illumination that promotes plant growth and vibrant aquatic life. Perfect for both beginners and pros seeking a sleek, reliable lighting upgrade.

Specifications

ASIN	B09B22VK8Z
Are Batteries Included	No
Best Sellers Rank	#30,876 in Pet Supplies ( See Top 100 in Pet Supplies ) #245 in Aquarium Lights
Brand	hygger
Bulb Base	GU10
Color Rendering Index	89
Colour	black
Colour Temperature	6800 Kelvin
Customer Reviews	4.4 4.4 out of 5 stars (2,087)
Enclosure Material	Aluminium
Finish Types	Polished
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
Maximum Compatible Light Source Wattage	18 Watts
Model number	HGH999
Mounting Type	Wall Mount
Number of Items	3
Number of Lights	108
Number of Packs	1
Power Source	Battery Powered
Shade Material	Metal
Shape	Rectangular
Specification Met	IP68
Style	Art Deco
Unit Count	1.0 Count
Wattage	18 Watts

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€ 161.92

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In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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