e-Vision(TM) Electronic HID Ballast Ballast Start Type Pulse ANSI Code C90/M90/M140/C191 Metal Halide Ballast Bulb Type Number of Bulbs Supported 1 Max Bulb Watts 100 W Input Voltage 120/277V AC Input Watts 109 to 110W -4 Degrees F Min Starting Temp Ballast Factor 1 Frequency 50/60Hz