NEMA - National Electrical Manufacturers Association
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NEMA C78.21-2011
Scope
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. Other groups of incandescent lamp standards are affected by this revision. Please see the normative paragraph below referencing 78.20@ 78.22@ and 78.23. At the time of issuance of this standard there was no comparable standard published by the International Electrotechnical Commission (IEC).
2003NEMA C78.21-2003 For Electric Lamps - PAR and R Shapes [Replaced: ANSI C78.21, ANSI C78.21, ANSI C78.21]
1995NEMA C78.21-1995 American National Standard for Incandescent Lamps - PAR and R Shapes (Includes: Supplement C78.21a-1996@ Supplement C78.21c-1998@ and Supplement C78.21b-1999)
1989NEMA C78.21-1989 ELECTRIC LAMPS - INCANDESCENT LAMPS - PAR AND R SHAPES