I'm using a ReefLedLights.com diy fixture. Going off memory it has 12 6500k white, 10 blue, and 14 royal blue. 36 led's total. Fully controllable with the apex. It's lighting the tank pretty well but I'm afraid I'm going to need more light coverage to get rid of some shaded areas on the outside parts of the rock work. The fixture measures 10" wide by 18" long.