Ge240rsmvn-diyb, electronic 2 lamp ballast for the following bulbs: f40t10, f40t12, f34t12, f30t12, f30t12/Wm, f20t12, starting temperature -20 degrees Fahrenheit, normal ballast power factor, .87-.98, 9.5"L x 1.3"W x 1.2"H, high efficiency Multi-Volt 120-277, Rapid start.