'HID Ballast, Ballast Lamp Type Metal Halide, Ballast Start Type Pulse, Ballast Max. Lamp Watts 39, ANSI Code M130/C130, Input Watts 44, Ballast Voltage 120/277, Ballast Family e-Vision(TM), Ballast Type Electronic, Number of Lamps 1, -20 Degrees C/-4 Degrees F Min. Starting Temp., Hz 60, Operating Amps @ 120V 0.39, Operating Amps @ 277V 0.18, Thermal Protection Yes, Length 3-51/64 In., Width 3 In., Height 1-13/64 In., Includes Bottom Exit Leads and Mounting Studs'