... Dimming Electronic Ballast (Both for HPS AND MH Lamp) 2, Voltage input range: 85Vac~305Vac 3, Rating V. In: 120V Parameter:INPUT ... V. In: 120V/220Vac3, Input frequency: 50Hz~60Hz4, Power factor: 0.99(Rating V. In)5, Efficiency: 95 %( Max)6, THD ... ): 370X180X105mm)5, Max case temperature (T C): 90°C 1000W 3-step Dimming electronic ballast (Both for HPS AND MH)