Advance Electromagnetic Fluorescent Ballast, Series: Standard, T12 Lamp, 200 W Lamp, 120 VAC, 3.31 A, 60 Hz Frequency, Rapid Start, 50 deg F Minimum Starting, Total Harmonic Distortion: 15%, Power Factor: 0.85, 2 Lamps, Thermal Protection: Class P, Ballast Factor: 0.85, ANSI C82.1 Ballast Grade, Metal, 14.31 in L x 3.19 in W x 2.63 in H Dimensions