Philips Advance SMARTMATE Electronic Fluorescent Ballast, Automatic Restart, CFL Lamp, 42 W Lamp, 93 W, 120 to 277 VAC, 0.33 to 0.78 A, 50/60 Hz, Programmed Start, 75 deg C Minimum Starting, Total Harmonic Distortion: 10%, Power Factor: 0.98, 2 Lamps, Ballast Factor: 0.97, Metal, 4.98 in L x 3 in W x 1.29 in D