LumaPro(R), Magnetic, HID Ballast Kit, Ballast Start Type Probe, ANSI Code M58, Metal Halide Ballast Bulb Type, Number of Bulbs Supported 1, Max. Bulb Watts 250 W, Input Voltage 120/208/240/277/480V AC, Input Watts 289 W, -20 Degrees F Min. Starting Temp., Ballast Factor 0.97, Frequency 60 Hz