The I-48 Fluorescent Emergency Ballast allows the same fixture to be used for both normal and emergency operation. In the event of a power failure, the I-48 switches to the emergency mode and operates one or two of the existing lamps for 90 minutes. The unit contains a battery, charger, and inverter circuit in a single can. The I-48 can be mounted in the wireway or on top of the fixture, and is UL Listed for retrofit applications. Can be used with most 2-8 ft. lamps, with a total initial output of up to 700 lumens for one or two lamps.