Advance Centium® Electronic Fluorescent Ballast, T8 Lamp, 32 W Lamp, 56 W Wattage, 120 to 277 VAC, 0.22 to 0.49 A, 50/60 Hz Frequency, Instant/Rapid Start, Total Harmonic Distortion: 10%, Power Factor: 0.98, 2 Lamps, Ballast Factor: 0.89, 70 deg C, Metal, 9.5 in L x 1.3 in W x 1 in H Dimensions