hygger Auto On Off LED Aquarium Light, Full Spectrum Fish

This aquarium light uses WRGB lamp beads. The three primary colors are scientifically adjusted to simulate natural light without flickering. It not only promotes the growth of water plants, but also makes water looks more sparkly clean and the color of the water plants is lifelike. Suitable for freshwater fish and aquarium plants, not for saltwater use

The DIY mode has 8 time periods, covering 24 hours, the start time, end time, light color and brightness of each time period can be set freely according to your preferences. The brightness of the white light in day mode can be set from 10% to 100%. Light color of night mode can be set to one of red, orange, yellow, green, cyan, blue, and purple. The time of day mode and night mode can be set freely

Optimized lamp body design. Full sealed process protects the device from humidity and water intruction, IP68 waterproof rating, no need to worry about splashing or accidentally falling into the water. 1.2mm premium aluminum shell provides more effective heat transfer, no fan and low voltage DC adapter, safe to use and energy saving

The controller has a clock on it to keep time for the 24 hour settings. When the time is up, the light will turn on or off automatically. You can see the current time, current mode, running start time or running end time, current light color and brightness on the LCD display. There are six setting buttons to ensure a more convenient and fast setting of the working mode you want

Comes with everything you need: 1 x LED light with controller, 1 x AC/DC adapter, 2 x adjustable metal brackets, 1 x user manual. The 18W aquarium light has 48 white lamp beads, 7 red lamp beads, 5 green lamp beads, 18 blue lamp beads and 20 RGB lamp beads

Mine gets plenty bright. Only problem I had was sitting timer

Extension cord?

The 26 watt has been pre-sold and will be available in stock in about 7 days.

I also have a 20 long. I think the 18W (18-24 inches) light would be a bit too small and is meant for a 20 HIGH tank. The 22W (24-30 inches) light would probably work but the actual light part would not be the full length of the tank and it MAY leave your sides and corners a bit darker. The 26W (30-36 inches) light would span the length of the tank but MIGHT hang off a little. I think I’m going to get the 26W (30-36 inches) light. I would rather have the light hang off by a little than be too short. I’ve got some plants in the corners that would like some more lighting lol.