GE UltraMax™ Electronic Ballast, High Efficiency, T8 Fluorescent Lamp, 32 W Lamp, 145/148 W Wattage, 120 to 277 VAC, 1.36/0.59 A, 50 Hz Frequency, Instant Start, -20 deg F Minimum Starting, Total Harmonic Distortion: <10 %, Power Factor: >0.98/0.99, 4 Lamps, Ballast Factor: 1.18, NEMA 1 Enclosure, 70 deg C, 9.5 in L x 1.7 in W x 1.18 in H Dimensions