ROBERTSON 3P10043 Ignitor for 200-400W High Pressure Sodium Lamp Equivalent to Philips-Advance LI-501-H4, LI501-J4-IC, Osram HPS400-3A, HPS 450-1B, HPS 460-1B Equivalent to Universal 47844, Keystone IGN-XG-02, GE 86641001I, Fulham HH-HPS-IG200-400 Save by ordering the Quik-Pak of 10 individually packaged ROBERTSON units 2P10043 Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Go to RobertsonDirect.com for complete technical data.