Fluorescent Ballast, Instant, 32 W, 120 V/277 V, Non Dimmable, 4 Lamps, 9.5 In Length, 1.7 In Width, 1.18 In Height, 0.95;0.84;0.87;0.77;0.77 Ballast Factor, 0.99;0.91;0.94 Power Factor, 50 HZ;60 HZ, 13 % (120 V);19 % (277 V) Total Harmonic Distortion, -22 °F Starting Temperature, 1.40 LB/Ea