ROBERTSON 3P20011 RSN1GPH20120 /BN eBallast for 1 GPH178T5 thru GPH463T5, GPHU22-212T5 or TUV-PLL18W Lamps, Preheat Rapid Start, 120Vac, 50-60Hz, NPF RSN1GPH20120/BN replaces the following ROBERTSON Magnetic Ballasts:NESGPH287110P/A,NESGPH287P/E Replaces: NESGPH287P/A and /B,SGPH2871105/A,SSGPH28711550 /A,SSGPH2875/A,SSGPH287P/I/AF/AJ/AM Replaces: SSGPH287P/AQ and /AU /C /E /F /K /L /M /P /R /S /U /X /Y /Z,SSGPH287P130/A,SSGPH287RC/J Replaces: SSGPH287RC/A,SSGPH287RC/C,SSGPH287RC/E,SSGPH287RC/G,SSGPH287RC/H,SSGPH287RC/K Save 26% and order the Quik-Pak of 10 individually packaged ROBERTSON units:2P20011 RSN1GPH20120/BN