Zilla Slimline Tropical 25 UVB T8 Fluorescent Fixture High quality fluorescent lighting for tropical habitats Includes a Tropical 25 watt UVB T8 bulb ideal for desert dwelling reptiles Full spectrum lighting enhances natural colors of the animal and environment Provides UVB light rays which are required for many reptiles to metabolize essential calcium The Zilla Slimline Tropical Fixture measures approximately 22 by 4 by 2 inches with an 18 inch bulb length