... 1x14w,1x28w,2x14w,2x28w,3x14w 2.patent 3.preheating start, preheat the filament, improve lamp life Hight quality T5 Electronic Ballast ... with GB17743-2007 about the radio electromagnetic interference requirements, the grid does not produce pollution, to ensure the safe use ... and effective. With ground function, safer for user.F T5 series have function with preheating start, preheat the filament, ...