This standard defines the dimensional limits and other physical characteristics required to ensure interchangeability and assist in the proper application of a specific category of lamps. This category is tungsten-halogen lamps with G22 bases and 63.5 mm (2½ in.) nominal light center length. Lamps of various design voltages are included. Lamps with the specifications listed in this standard are intended for stage and studio applications. The grouping of lamps in this standard is based on general physical characteristics. It does not imply that the lamps listed are interchangeable with each other in a particular application. Other tungsten-halogen lamps for stage and studio applications are described in standards listed in Annex B. Certain lamps in this standard are compatible with IEC 60357.