DUAL-LITE UFO-7W Emergency Ballast, 120/277V. More details: Linear Fluorescent Emergency Ballast, Lamp Watts 17-215, Lamp Type T5, T8, T9, T10, T12, Initial Lumens 1450 to 3500, Housing Material Steel, Length 16-19/64 In., Width 5-1/2 In., Height 1-45/64 In., Input Voltage 120/277, Number of Lamps Supported 1 or 2, Lamp Length Supported 2 ft. to 8 ft., Emergency Illumination Time 90 min., Battery Type NiCad, Standards UL 924, Suitable for Damp Locations, NFPA 70 and 101