The XEB-5-B-LM Fluorescent Emergency Ballast allows the same fixture to be used for both normal and emergency operation when used in conjunction with an AC ballast. If used in an emergency only fixture, no AC ballast is necessary. In the event of a power failure, the XEB-5-B-LM instantly switches to the emergency mode and operates one of the existing lamps for 90 minutes. The unit contains a battery, charger, and electronic circuit in a single can. The XEB-5-B-LM can be mounted in the wireway or on top of the fixture, and is UL Listed for factory installation or retrofit applications. The XEB-5-B-LM has a minimal initial output of 350-450 lumens for one lamp.