Philips Advance Electronic Fluorescent Ballast, T8 Lamp, 32 W Lamp, 120 to 277 VAC, 0.82 A, 50/60 Hz, Instant Start, -20 deg F Minimum Starting, Total Harmonic Distortion: 0.1, Power Factor: 0.98, No, 4 Lamps, Thermal Protection: Class P, Ballast Factor: 0.77, 70 deg C, Metal, 9.5 in L x 1.3 in W x 1 in H Part Number:IOPA4P32LWN35M