The GE UltraStart line of T5 ballasts incorporates the benefits of programmed start ballasts with the energy savings, rapid starting, and parallel lamp operation of instant start ballasts. The GE 67566 electronic fluorescent ballast operates four F54T5/HO lamps at 120/277 input volts. Ideal for use in high light areas, this programmed start ballast is typically used in high bays, warehouses, and manufacturing facilities.