R-Zilla SRZ100011869 Tropical 25 UVB Reptile Fluorescent T8 Bulb, 17-watt Tropical 25 bulbs correct this deficiency with a full dosage of UVB along with essential UVA light Tropical 25 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 complete family of high efficiency bulbs for most types of fluorescent fixtures Bulb operates at 17-watts Measures 25-3/4-inch length by 2-inch width by 1-3/8-inch height