Advance CentiumĀ® Electronic Fluorescent Ballast, T5/HO Lamp, 54 W Lamp, 119/117 W Wattage, 120 to 277 VAC, 0.43 to 1 A, 50/60 Hz Frequency, Programmed Start, Total Harmonic Distortion: 10 %, Power Factor: 0.98, 2 Lamps, Ballast Factor: 1, NEMA 34 Enclosure, 90 deg C, Metal, 9.5 in L x 1.3 in W x 1 in H Dimensions