American National Standard for Electric Lamps—Slide Projector Lamps, Condensing, Dichroic, Two-inch (51 mm), Integral Reflector, Rim Reference Tungsten-Halogen Lamps with GY 5.3 Bases
Consolidates the lamps commonly used for slide projectors into a single standard. The lamps contained in this Standard are not to be considered as interchangeable—they will all fit the common socket used for these lamps.