LumaPro(R) Magnetic HID Ballast Kit Ballast Start Type Pulse ANSI Code M131 Metal Halide Ballast Bulb Type Number of Bulbs Supported 1 Max Bulb Watts 350 W Input Voltage 120 to 277V AC Input Watts 397 W -20 Degrees F Min Starting Temp Ballast Factor 0.97 Frequency 60 Hz