R-Zilla SRZ100011509 Desert 50 UVB Reptile Fluorescent T5 Bulb, 14-watt Desert 50 UVB fluorescent T5 bulb delivers UVB light levels essential for desert reptile health The Desert 50 family of bulbs also provide needed UVA light, plus visible-spectrum illumination that makes skin coloration more vivid and viewable Desert 50 bulb is designed for 3500 hours or 12 full months of average use Bulb operates at 14-watts Measures 24-1/2-inch length by 2-inch width by 1-inch height