Emergency Ballast Carries the load of the luminaire until the generator comes online The Chloride DEB Fluorescent emergency ballast carries the load of the luminaire in the event of a power loss, until the generator comes online.They light a specified number of lamps about half brightness to assist in egress form the building. Dual voltage--12/277VAC, 6 Hz;High temperature nickel-cadmium batteries;22-gauge steel cases Exit and Emergency