FireHorse Electronic Emergency Fluorescent Ballast Input Voltage 120 to 277V AC Number of Bulbs Supported 1 2 Max Bulb Watts 96 W Circline Quad Tube T10/T10VHO T12/T12HO T5/T5HO T8/T8HO Triple Tube Twin Tube Ballast Bulb Type Initial Lumens 1400 lm Steel Housing Material 14 9/16 in Length 1 1/4 in Width 1 1/4 in Height Standard Profile 90 min Emergency Illumination Time 24 hr Recharge Time