Hunter 30850 UVC Bulb This Replacement Bulb is for Use with Hunter Air Purifiers and Humidifiers with UVC Germicidal Technology. The UVC Bulb Should be Replaced Annually to Maintain Maximum Efficiency. UVC Germicidal Technology Kills up to 99.9% of Germs and Viruses. Replaceable Used by the Following Models: 30835, 30836, 30837, 30839, 30840, 30841, 30842, 31206, 31207, 31208, 36516, 36517, 36518