LumaPro(R) Magnetic HID Ballast Kit Ballast Start Type Probe ANSI Code M57 Metal Halide Ballast Bulb Type Number of Bulbs Supported 1 Max Bulb Watts 175 W Input Voltage 120 to 277V AC Input Watts 207 W -20 Degrees F Min Starting Temp Ballast Factor 0.97 Frequency 60 Hz