ROBERTSON Fluorescent eBallast(s) for 2 F28T5 Linear Lamps, Program Start, 120-277Vac, 50-60Hz, Normal Ballast Factor, HPF, (Successor to Model PSA228T5MV /A) Equivalent to Philips-Advance ICN-2S28, Osram QTP2x28T5/UNV, Universal B228PUNV Equivalent to Keystone KTEB-228HE-UV-PS-SL, General Electric GE228MVPS, Hatch HL228HE/PS/UV/W Equivalent to Fulham RHA-UNV-228-LT10 Save by ordering the Quik-Pak of 10 individually packaged ROBERTSON units 2P20138 Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience.