Universal™ AccuStart®5 Electronic Fluorescent Ballast, T5HO Lamp, 39 W Lamp, 89 W, 120 to 277 VAC, 0.96 A, 50/60 Hz, Programmed Rapid Start, -18 deg C Minimum Starting, Total Harmonic Distortion: 0.98, Dimmable: No, 2 Lamps, Ballast Factor: 1, NEMA 1, 167 deg F, 16.88 in L x 1.245 in W x 1 in H