ROBERTSON 3P10006 BLU0050A04900 HID Reactor mBallasts Kit, High Pressure Sodium, 50 Watt (S68), NPF, 120Vac., 60Hz Equivalent to: PHILIPS-ADVANCE 71A7807, OSRAM SYLVANIA LU50/120R, UNIVERSAL 1233-251U Equivalent to: HATCH GS50ARNCK, KEYSTONE HPS-50R-1 Save and order the 2P10006 Quik-Pak of 4 units individually packaged Go to RobertsonDirect.com for complete technical data.