Tropical Series 25 coil bulb is ideal for tropical or temperate dwelling reptiles that require UVB/UVA lighting;Provides UVB light rays which are required for many reptiles to metabolize essential calcium;Full spectrum lighting enhances natural colors of the animal and environment;Energy efficient bulb which lowers energy costs (replace every 12 months to ensure proper UVB levels);Coil bulb design fits most standard incandescent bulb sockets