GE UltraMax™ Electronic Ballast, High Efficiency, T8 Fluorescent Lamp, 32 W Lamp, 120 to 277 VAC, 0.94/0.4 A, 60 Hz Frequency, Instant Start, -20 deg F Minimum Starting, Total Harmonic Distortion: <10 %, Power Factor: >0.98/0.99, 4 Lamps, Ballast Factor: 0.87, NEMA 1 Enclosure, 40 deg C, 9.5 in L x 1.3 in W x 1 in H Dimensions