Advance CentiumĀ® Electronic Fluorescent Ballast, T8 Lamp, 32 W Lamp, 111 W Wattage, 120 to 277 VAC, 0.41 to 0.94 A, 50/60 Hz Frequency, Instant Start, Total Harmonic Distortion: 10 %, Power Factor: 0.98, 4 Lamps, Ballast Factor: 0.89, 70 deg C, Metal, 9.5 in L x 1.3 in W x 1 in H Dimensions