Advance Mark 10® Powerline Dimmable Fluorescent Ballast, Controllable, T5/HO Lamp, 54 W Lamp, 24 to 114 W Wattage, 120 VAC, 1.05 A, 60 Hz Frequency, Programmed Start, 10 deg C Minimum Starting, Total Harmonic Distortion: 10%, Power Factor: 0.98, Yes Dimmable, 2 Lamps, Ballast Factor: 0.03 to 1, 70 deg C, Metal, 16.7 in L x 1.18 in W x 1 in H Dimensions