Lennox X8794 - X8794 Air PCO16-28 PCO14-23 PCO20-28, Compatible Healthy Climate PureAir UV Lamp for Lennox PureAir Systems Effective Hours Rating: 10,000hrs - Ultraviolet Germicidal Light Bulb For residential air treatment units, stand-alone purifiers and deactivation of bacteria, viruses and other micro-organisms Short-wave UV radiation with a peak at 253.7 nm (UVC) for disinfection purposes Produces UV-C (253.7 nm wavelength) radiation 533.4MM Long