Bodine, Electronic, Emergency Fluorescent Ballast, Input Voltage 120 to 277V AC, Number of Bulbs Supported 1, 2, Max. Bulb Watts 55 W, Type A TLED Ballast Bulb Type, Initial Lumens 730 to 1400 lm, Galvanized Steel Housing Material, 13 3/8 in Length, 2 1/4 in Width, 1 1/4 in Height, Low Profile, 90 min Emergency Illumination Time, 24 hr Recharge Time