Ballast, Programmed, 40 W, 277 V Ac, 0.83 A, FT40W/2G11 Shape, Non Dimmable, 3 Lamps, 9.5 In Length, 1.7 In Width, 1.18 In Height, 0.88 Ballast Factor, 0.98 Power Factor, 50 to 60 HZ, Metal Housing Material, 10 % Total Harmonic Distortion, 5 Yr Warranty, 0.568 KG/Ea