Replace Once Every 18 months
The powerful medical grade 100 percent (non ozone producing) 23 watt ultraviolet lamp is rated at 21,306 microwatts sec/cm2. This UV dosage is strong enough to destroy just about any type or biological antigen, pathogen, microorganism, mold spore or virus that can enter into this air purifier! The UV lamp is placed in the air purifiers filter chamber so the ultraviolet light can hit the intake side of the HEPA filter on all sides for the best kill ratio of biological organism contaminants in the air flow and on the surface of the HEPA filter. The UV lamp can be switched on and off when desired. Replace this bulb once every 10,000 hours or aprox once every 14 months of constant use.