Power Sentry(R) Electronic Fluorescent Battery Pack Input Voltage 120 to 277V AC Number of Bulbs Supported 1 Max Bulb Watts 40 W T8 Ballast Bulb Type Initial Lumens 450 to 550 lm Thermoplastic/Metal Housing Material 9 1/2 in Length 2 1/2 in Width 1 3/16 in Height Low Profile 90 min Emergency Illumination Time 24 hr Recharge Time