The AquaEl Leddy Slim Sunny LED Fixtures are appropriate for fish-only freshwater aquariums. The 6500K LEDs are a slightly yellowish color ( almost pure white ) that will bring out the color of all fish. These thin but powerful lights come with a very well designed light mount that can be adjusted to fit the dimensions of oddly sized tanks. The light is 40" long and the mount can accommodate tanks up to 48" wide. - 36W. 6500K. - Appropriate for fish-only freshwater aquariums - Black light body - For tanks from 40"- 48" wide. The mounts slide easily, but remain firmly in place.