Advance Centium ICN-2TTP-40-SC - (2) Lamp Fluorescent Ballast - 40 Watt CFL - 120/277 Volt - Instant Start - 0.88 Ballast Factor Volts: 120/277 # of Lamps: 1-2 Bulb Type(s) Used: CFL Dimensions: L: 9.5" W: 1.7" H: 1.2"