Zilla UVB Fluorescent Coil Bulb Zilla Tropical 25 Bulbs provide a full dosage of UVB along with essential UVA light 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 Coil bulb design fits most standard incandescent bulb sockets