American National Standard for Electric Lamps – Condenser-Reflector, Four-Pin Prefocus-Base Projection Lamps – Dimensions
standard by American National Standards Institute, 07/24/2015

American National Standard for Electric Lamps – CBA Projection Lamp
standard by American National Standards Institute, 07/24/2015

American National Standard for Dimensions and Centering Systems for Projection Lamps – 51 mm (2 in.) Integral Reflector, Rim Reference Lamps with GX5.3, GY5.3 and GU5.3 Bases
standard by American National Standards Institute,

American National Standard for 1.65 in. (42 mm) Integral Reflector, Rim Reference Projection Lamps with GX5.3 or GY5.3 Bases – Dimensions and Centering Systems
standard by American National Standards Institute, 01/01/1997

American National Standard for Microfilm Projection Lamps – 2 in. (51 mm) Dichroic Coated Integral Reflector, Rim Reference Tungsten Halogen Lamps with GX5.3 Bases
standard by American National Standards Institute,

American National Standard for Dimensions and Centering Systems for Projection Lamps – 35 mm Integral Reflector, Rim Reference Lamps with GZ4 Bases
standard by American National Standards Institute,

American National Standard for Electric Lamps-Tungsten Halogen Lamps with G6.35, GX6.35 and GV6.35 Bases
standard by American National Standards Institute, 1997

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
standard by American National Standards Institute, 06/01/1997

American National Standard for Tungsten Halogen (TH) Lamps with GZ9.5 Two-Pin, Prefocus Bases and 36.5 mm Nominal Light Center Length
standard by American National Standards Institute, 01/01/1997