GE Industrial Solutions Ultramax Electronic Ballast, 120, 277 V, Circuit Type: Parallel, Number of Lamps: 1, Start Type: Instant, Ballast Factor: 0.87 to 0.98, Operating Temperature: 70 deg C, Dimensions: 9.5 in L x 1.7 in W x 1.18 in HEnergy saving high-efficiency instant start electronic ballastMulti-voltage technology handles voltage from 120 to 277 VActive current regulation regulates the output to each lamp with individual lamp inverter modulesAnti-striation control for better light quality, with no striationsCold temperature -20 deg F minimum starting temperature