American National Standard for Electric Lamps - Slide Projector Lamps, Condensing, Dichroic, Two-inch (51 mm), Integral Reflector, Rim ReferenceTungsten-Halogen Lamps with GY 5.3 Bases
ANSI C78.1431-1997 (R2016) 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.