GE UltraMax™ Electronic Ballast, High Efficiency, Series: Professional, T8 Fluorescent Lamp, 32 W Lamp, 53/54 W Wattage, 120 to 277 VAC, 0.47/0.21 A, 60 Hz Frequency, Instant Start, -20 deg F Minimum Starting, Total Harmonic Distortion: 0.1 %, Power Factor: >0.96/0.99, 2 Lamps, Ballast Factor: 0.87, NEMA 1 Enclosure, 70 deg C, 9.5 in L x 1.3 in W x 1 in H Dimensions