ROBERTSON 3P10060 Individual 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 1233154U003 Equivalent to Keystone HPS-150R-1, Hatch GS150ARNAK Save by ordering the Quik-Pak of 4 individually packaged ROBERTSON units 2P10060 Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Go to RobertsonDirect.com for complete technical data.