... RS232/RS485/TTL 4.CE,UL,FCC,CUL 150W HPS digital electronic ballast CE,UL,FCC,CULModelHPS-150W-DLighting Source Type150WInput ... start, suitable for low voltage circumstances·High efficiency >94%,remarkable effect of saving energy·High power factor, able to reduce initial ... be installed far from lamp and is easy to maintain.)·High quality of illumination, no frequent flash·Low total harmonic distortion, ...