Sylvania 49879 2 Lamp 59W ballast is T8 fluorescent for 120/277 volt applications. The QHE 2x59T8/UNV ISH-SC is a high efficiency, instant start, high ballast factor fluorescent ballast. SYLVANIA QUICKTRONIC High Efficiency (QHE) energy savings electronic T8 ballasts save up to 6% wattage over standard electronic ballasts without compromising light output or lamp life. The RoHS compliant ballast features a new small can and feature lead-free solder and manufacturing process.