This standard provides physical and electrical characteristics of the group of incandescent lamps that have PAR and R bulb shapes. Lamps with clear, frosted, and lens end bulbs, with clear and prescription lenses, and with various reflector coatings are covered. Lamps covered in this standard may contain either of two basic types of light sources: an incandescent filament or a tungsten halogen inner bulb. Sunlamps and heat lamps of the R type are included. Lamps with discharge arc tubes are not included.
This revision adds the R16 lamp to the C78.21 Standard, thus allowing the lighting industry to manufacture these lamps based upon a common set of specifications.
Published Date: December 22, 2022
Number of pages: 43
Staff Contact: Michael Erbesfeld