Fluorescent Ballast, Programmed, 48 W;50 W;60 W;72 W;96 W, 120 to 277 V, 0.61 to 1.45 A, Non Dimmable, 2 Lamps, 11.75 In Length, 2.15 In Width, 1.61 In Height, 0.88 to 0.92 Ballast Factor, 0.95 to 0.99 Power Factor, 60 HZ, Metal Housing Material, 20 % Total Harmonic Distortion, -20 °F Starting Temperature, 2.0 LB/Ea