The ISL54 fluorescent emergency ballast allows the same fixture to be used for both normal and emergency operation. In the event of a power failure, the ISL54 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 ISL54 operates T5, T6, and T8 lamps, including HO and 4-pin long compact fluorescent lamps from 36-55 watts at an initial output of up to 825 lumens for one lamp. The ISL54 utilizes AC output to ensure compatibility with new lamp technologies. The ISL54 delivers high performance in a slim design and is ideal for use in linear lighting fixtures where ballast compartment space is limited. The ISL54 is suitable for use in damp locations and in enclosed and gasketed fixtures.