R-Zilla tropical 25 UVB fluorescent bulb is ideal for tropical and temperate dwelling reptiles such as anoles, day geckos, tokay geckos, iguanas, basilisks, chameleons, Chinese water dragons, tegus, red-eared sliders, red foot tortoises and eastern box turtles. Delivers extra UVB light essential for strong bones. Color corrected visible light brightens reptile colors. Designed for both fluorescent, incandescent light fixtures. Recreate the healthy light of the tropical rainforest. Standard terrarium bulbs can"t deliver the heightened levels of UVB radiation native to a tropical habitat, leaving rainforest reptiles deficient in a vital component of healthy bone development. Tropical 25 bulbs correct this deficiency with a full dosage of UVB (25 microwatts per second/cm2) along with essential UVA light. As a bonus, Tropical 25"s full-spectrum visible light output helps bring out subtle colors in a reptile"s skin that makes everyday viewing more dramatic. Tropical 25 capability is built into R-Zilla"s complete family of high efficiency bulbs for most types of fluorescent fixtures (compact, T5 and T8.) Incandescent bulb users also have the option of a coil bulb that fits a standard light socket. Tropical 25 bulbs are designed for 3500 hours or twelve full months of average use. Bulb operates at 17-watts. Measures 25-3/4-inch length by 2-inch width by 1-3/8-inch height.