LumaPro(R), Magnetic, HID Ballast Kit, Ballast Start Type Pulse, ANSI Code M135, M155, Metal Halide Ballast Bulb Type, Number of Bulbs Supported 1, Max. Bulb Watts 400 W, Input Voltage 120 to 277V AC, Input Watts 454 W, -20 Degrees F Min. Starting Temp., Ballast Factor 0.97, Frequency 60 Hz