LumaPro(R), Magnetic, HID Ballast Kit, Ballast Start Type Pulse, ANSI Code M141, Metal Halide Ballast Bulb Type, Number of Bulbs Supported 1, Max. Bulb Watts 1,000 W, Input Voltage 120 to 277V AC, Input Watts 1,100 W, -20 Degrees F Min. Starting Temp., Ballast Factor 0.97, Frequency 60 Hz