Compact Fluorescent Emergency Ballast Lamp Watts - Emergency Lighting and Exit Signs 18 to 42 Initial Lumens - Emergency Lighting and Exit Signs 750 Housing Material Steel Length - Emergency Lighting and Exit Signs 9-13/32 In. Width 2-1/2 In. Height 1-1/2 In. Voltage - Emergency Lighting and Exit Signs 120/277 Number of Lamps Supported 1 Emergency Illumination Time - Emergency Lighting and Exit Signs 90 min. Battery Type Nickel Cadmium Standards UL Listed