Ballast, Fluorescent Electronic; Lamp Type: T12; Lamp Watts : 30-40W; Number of Lamps: 2; Lamp Starting Method: Rapid; Voltage: 120/277V; Primary Lamp Type: F40T12; Power Factor: Normal Power; Wiring: Series; Min Temp - deg F: 50°F (10°C); Packaging: Individual Pkg:10 (Priced per ballast); Lamp Range: F30T12, F34T12, F40T12; THD Max - Percent: 0.1; Dimensions: LxWxH: 9.50x1.30x1.00 in (24.1x3.3x2.5 cm); Manufacturer Series: Centium