ROBERTSON 2P10060 Quik-Pak of 4 mHID, 150 Watt S55 High Pressure Sodium Lamp, 120Vac, 60Hz, Normal Ballast Factor, NPF, Model BLU0150A04900 M (Replaces Model BLU0150A04900) Equivalent to Philips-Advance 71A8107, Osram LU150/120R, Universal 1233154U002 Equivalent to Keystone HPS-150R-1, Hatch GS150ARNAK Also offered as a individually packaged version by ordering our ROBERTSON 3P10060 Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Go to RobertsonDirect.com for complete technical data.