ROBERTSON 3P10028 BLU0150A04900 HID Reactor mBallast Kit, for 1 High Pressure Sodium, 150 Watt (S55) Lamp, Pulse Start, 120Vac, 60Hz, NPF Equivalent to Philips-Advance 71A8107, Osram LU150/120R, Universal 1233154U001 Equivalent to Keystone HPS-150R-1, Hatch GS150ARNAK Save by ordering the Quik-Pak of 10 individually packaged ROBERTSON units 5P10028 Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Go to RobertsonDirect.com for complete technical data.