Advance Mark 7 0-10V Dimmable Fluorescent Ballast, Controllable, T8 Lamp, 32 W Lamp, 25 to 118 W Wattage, 120 to 277 V AC, 0.42 to 0.98 A, 50/60 Hz Frequency, Programmed Start, 10 deg C Minimum Starting, Total Harmonic Distortion: 10%, Power Factor: 0.99, Yes Dimmable, 4 Lamps, Ballast Factor: 0.05 to 0.88, 70 deg C, Metal, 16.7 in L x 1.18 in W x 1 in H Dimensions