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OSRAM 49598 2 Lamp 59W ballast is T8 fluorescent for 120/277 volt applications. The QTP2x59T8/UNV ISN-SC is a high efficiency, instant start, normal ballast factor fluorescent ballast.  OSRAM 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. OSRAM is formerly known as Sylvania.  This product is also known as Sylvania 49598 or Sylvania QTP 2X59T8/UNV ISN-SC