ROBERTSON 3P10059 BLU0100A04900 M mHID Ballast Reactor Kit for 100 Watt S54, High Pressure Sodium Lamps, 120Vac, 60Hz, NPF (Successor to 3P10008, BLU0100A04900) Equivalent to Philips-Advance 71A8007, Osram LU100/120R, Universal 123310U003 Equivalent to Keystone HPS-100R-1, Hatch GS100ARNAK Save by ordering the Quik-Pak of 4 individually packaged ROBERTSON units 2P10059 Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Go to RobertsonDirect.com for complete technical data.