... ,CE,(EMC ,LVD)ROHS,SAA,TUV,UL. 2013 2U classroom lampsApplicationHome,hotel,restaurant,office,meeting room,shops and ... It was designed to preheat the filament prior to lamp ignition in order to extend the lifetime of tube ... for Any Question!---I am ??????! Model NumberCRIColor TemperatureWattBaseYPZ15-2U.105802700/6500K15WE27YPZ20-3U.107802700/6500K20WE27YPZ65-4U.106802700/6500K65WE27/E40YPZ125-5U ...