HPS/MH:35W,50W,70W,100W,150W,200W,250W,320W,400W,575W,600W,750W,1000W,1500W both voltage:110V/220V Dimming function UL and CE HID MH Digital Electronic Ballast for 320W Metal Halide Lamp Voltage input range: 108Vac~305Vac Rating V. In: 120/277VAC Input frequency: 50Hz~60Hz Power factor: >0.99 Efficiency: 95 %( Max) THD: <10% Output power: 320W Current crest factor: <1.5 Output frequency: 150Hz ...