NEMA Lighting System-published standards include ANSI C81.61-2009 (R2014) American National Standard for Electrical Lamp Bases—Specifications for Bases for Electric Lamps; ANSI C81.62-2009 (R2014) American National Standard for Electric Lampholders; ANSI C81.63-2007 (R2014) American National Standard for Gauges for Electric Lamp Bases and Lampholders; and ANSI C81.64-2005 (R2014) American National Standard for Guidelines and General Information for Electric Lamp Bases, Lampholders, and Gauges.