... /TTL 4.CE,UL,FCC,CUL 150W HPS digital electronic ballast CE,UL,FCC,CULModelHPS-150W-DLighting Source Type150WInput Voltage220VInput voltage frequency50 ... line driven (The ballast can be installed far from lamp and is easy to maintain.)·High quality of illumination, ... protection: protection for open loop, short loop and hot lamp restart·Low temperature rise, applicable to wind range of environmental ...