The I-40 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-40 switches to the emergency mode and operates one of the existing lamps for 90 minutes. The unit contains a battery, charger, and inverter circuit in a single can. The I-40 can be mounted in the wireway or on top of the fixture, and is UL Listed for retrofit applications. The I-40 can be used with most 2-4 lamps, with an initial output of up to 700 lumens for one lamp. The I-40 is suitable for use in damp locations and in enclosed and gasketed fixtures.