Historical
ANSI C78.1430-1997 (S2018)
Electric Lamps -Tungsten Halogen Lamps with G6.35, GX6.35 and GV6.35 Bases"
Defines the dimensional limits and other physical characteristics required to ensure interchangeability and to assist in the proper application of a specific category of lamps. This category is TH lamps with G6.35, GX6.35 and GY6.35 two-pin bases and 27.0 to 40 mm nominal light center length.
NEMA: National Electrical Manufacturers Association [nema]