e-Vision(TM) Electronic HID Ballast Ballast Start Type Pulse ANSI Code C98/M98/C139/M139/M1 Metal Halide Ballast Bulb Type Number of Bulbs Supported 1 Max Bulb Watts 70 W Input Voltage 120/277V AC Input Watts 76 to 79W -4 Degrees F Min Starting Temp Ballast Factor 1 Frequency 50/60Hz