ROBERTSON 3P20023 PSL432T8HEMV /A Fluorescent eBallast 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,General Electric GE432MVPSN, Keystone KTEB-432LBF-UV-TP-PS Program Start extends lamp life in frequently switched applications, more than 50,000 on/off cycles Ballast has the equivalent energy savings of instant start ballasts Save and order the 2P20023 Quik-Pak of 10 units individually packaged Save the most with the 5P20023 carton of 10 units, not individually packaged