Zilla Desert Series Flourescent Compact Bulb delivers UVB light levels essential for desert reptile health, When it comes to the bone health of a desert reptile, the extra daily dose of UVB light provided by a Desert 50 bulb (50 microwatts per second/cm2) is as essential as proper food and water for long term strength, 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 bulbs are designed for 3500 hours or twelve full months of average use, Size: 9 watt, SKU: RPS28004