ANSI/NEMA C78.1430-1997

American National Standard for Slide Projector Lamps - Condensing, Dichroic, 1.65 in. (42 mm), Integral Reflector, Rim Reference Tungsten Halogen Lamps with GX5.3 Bases National Electrical Manufacturers Association

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Defines the dimensional limits and other physical characteristics required to ensure commonality and interchangeability and to assist in the proper application of projection lamps.