CALL FOR VOLUME PRICING 888-953-EXITEmergency Ballast provide a method and circuit for operating fluorescent lamps having a starter with power supplied by a battery by generating an alternating current from energy supplied by the battery, supplying the alternating current as a starting current to the lamps for a selected period of time. Typically 90 minutes of emergency power will illuminate the fluorescent fixture. Exit Sign Warehouse stock virtually every ballast. T12, T8, and High output T5 Ballast with a variety of Lumens 500,700,1400,3000. Many other options are available. Please contact our trained staff for any of your emergency needs.