Advance Centium® Electronic Fluorescent Ballast, T8 Lamp, 32 W Lamp, 59 W Wattage, 120 to 277 VAC, 0.21 to 0.5 A, 50/60 Hz Frequency, Instant/Rapid Start, Total Harmonic Distortion: 10%, Power Factor: 0.98, No Dimmable, 2 Lamps, Ballast Factor: 0.88, NEMA 21 Enclosure, 70 deg C, Metal, 9.5 in L x 1.08 in W x 1.05 in H Dimensions