SunSun 18 Watt PL-L TUV Germicidal UV Replacment Bulb 2G11 Base 18W by Tech'n'Toy 18 Watt Germicidal Fluorescent Ultraviolet Light Bulb 100% Ozone Free Short-wave UV radiation with a peak at 253.7 nm (UVC) for disinfection purposes Average Life Hour: 10,000hrs 2G11 4-pin Base