ROBERTSON 3P10023 Ignitor for 35-150W High Pressure Sodium Lamp Equivalent to Philips-Advance LI551-H4-IC, LI551-J4-IC, LI501-H4-IC, Osram HPS150-3A Equivalent to Universal 47843 Keystone IGN-XG-01, GE 86635001I, Fulham HH-HPS-IG70-150 Save by ordering the Quik-Pak of 10 individually packaged ROBERTSON units 2P10023 Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Go to RobertsonDirect.com for complete technical data.