ROBERTSON 3P20165 PSM2GPH18MVDW Fluorescent eBallast for 2/1 PL-L18W/TUV, GPH212T5 thru GPH463T5 Lamps, 1 PL-36W/TUV, TUV36W, GPH463T5 thru GPH810T5 Lamps, 120-277Vac, 50-60Hz, NBF, HPF Replaces ROBERTSON models: NES20604P /A, NES20604P /D, NESGPH28726P /A Replaces ROBERTSON models: NESGPH28745 /A, NESGPH28746P /A Replaces ROBERTSON models: NESGPH287P /C, NESGPH287P /D Commercial grade. Two Year Factory Warranty Go to RobertsonDirect.com for complete technical data.