ROBERTSON 5P20023 PSL432T8HEMV /A Bulk-Pak of 10 Fluorescent eBallasts for 4 F32T8 Linear Lamps, Program Start, Parallel Series Connection, 120-277Vac, 50-60Hz, Normal Ballast Factor, HPF, NEMA Premium Equivalent to: Philips Advance IOP4PSP32SC, GE GE432MVPSN, Keystone KTEB-432LBF-UV-TP-PS High efficiency electronic ballast, Instant Start,Parallel Operation,High Power Factor,Sound Rated A Ballast has the equivalent energy savings of instant start ballasts Also available as a Quik-Pak of 10 units individually packaged as 2P20023 Also available as a single quantity as 3P20023