LumaPro(R), Magnetic, HID Ballast Kit, Ballast Start Type Probe, ANSI Code M47, Metal Halide Ballast Bulb Type, Number of Bulbs Supported 1, Max. Bulb Watts 1,000 W, Input Voltage 120 to 277V AC, Input Watts 1,076 W, -20 Degrees F Min. Starting Temp., Ballast Factor 0.97, Frequency 60 Hz