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This Sylvania Lumalux coated 150w pulse start E17 shape bulb has E26 medium screw-in base, 24000 hours average rated life, 2100k color temperature and universal operating position. The bulb ANSI code is S55 and has a warm-up time of 3-4 minutes plus hot restart time of 1 minute. LUMALUX'S high pressure sodium lamps offer a reliable light source with high efficacy and long life. With up to 140 lumens per watt (LPW) initial efficacy and excellent lumen maintenance, these"high pressure sodium" lamps deliver consistent light levels throughout their long lifetime. LUMALUX high pressure sodium lamps have a proven history in the marketplace for over 30 years, yet refinements to the technology provide an opportunity to improve performance ratings.