Tropical 25 UVB Fluorescent Bulbs Ideal for these tropical and temperate dwelling reptiles: Anoles, Day Geckos, Tokay Geckos, Iguanas, Basilisks, Chameleons, Chinese Water Dragons, Tegus, Red-Eared Sliders, Red Foot Tortoises and Eastern Box Turtles. 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.