FULHAM® WorkHorse™ Electronic Fluorescent Ballast, Versatile, T12 Lamp, 64 W Wattage, 120 VAC, 0.56 A, 50/60 Hz Frequency, Instant Start, -20 deg F Minimum Starting, Total Harmonic Distortion: >0.9 %, Power Factor: >0.98, 2 Lamps, Thermal Protection: Class P, Ballast Factor: 0.99, -30 deg C, Aluminum Gray/White, 6-1/2 in L x 1-1/2 in W x 1 in H Dimensions,