The OSUVB8 is a 8" long, 18 watt, 254NM, high output UVC bulb with a 13,000 hour life. It is designed specifically to be used with OdorStop OS36 and OS36PRO UV Air Treatment Systems. It can also be used for Honeywell and other UV treatment systems that require a UV bulb with a 2G11 base. This bulb cannot be used with OdorStop OS72, OS72PRO, or OS144PRO units.