Ballast, Fluorescent, Electromagnetic, Input Voltage: 277 Vac, Input Amps: 0.75 Amp, Ballast Factor: 0.98, Minimum Starting Temperature: -20 Degree F, Number Of Lamps: 2, Lamp Wattage: 87, Lamp Type: Rapid Start, High Output, Total Harmonic Distortion: <20 Percent