Advance Centium® Electronic Fluorescent Ballast, T5/HO Lamp, 54 W Lamp, 120/119 W Wattage, 347 to 480 VAC, 0.25 to 0.35 A, 50/60 Hz Frequency, Programmed Start, -20 deg F Minimum Starting, Total Harmonic Distortion: 10%, Power Factor: 1, No Dimmable, 2 Lamps, Ballast Factor: 1, 90 deg C, Metal, 16.7 in L x 1.18 in W x 1 in H Dimensions