Suggestions for improvement of this standard should be submitted to the Secretariat C78, American National Standard Lighting Group, 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209.

　　This standard was processed and approved by Accredited Standards Committee on Electric Lamps, C78, and its Working Group, C78 WG-1 for Incandescent, Photo, andStage-Studio Lamps. Committee approval of the standard does not necessarily imply that all committee members voted for that approval.

　　PART I General Information

　　1、Scope

　　This standard sets forth physical and electrical characteristics of the group of incandescent lamps that have A, G, PS, and similar bulb shapes with E26 single and double contact medium screw bases including the reduced wattage versions. Only clear, inside frost, frost-equivalent, and white bulb finishes are acknowledged. Excluded from this standard are tungsten-halogen and projection lamps.

　　Other groups of incandescent lamps are covered in the following associated standards:

　　ANSI C78.21-2003, American National Standard for Electric Lamps - Incandescent Lamps, PAR and R Shapes

　　ANSI C78.22-1995, American National Standard for Electric Lamps - Incandescent Lamps, A, G, PS, and Similar Shapes with E39 Mogul Screw Bases

　　ANSI C78.23-1995, American National Standard for Electric Lamps - Incandescent Lamps, Miscellaneous Types

　　Many of the lamps covered by this standard do not relate to internationally standardized lamps that appear in International Electrotechnical Commission (IEC) standards. The subject lamps are not limited with regard to design life as are those in IEC 60064, Tungsten Filament Lamps for Domestic and Similar General Lighting Purposes1. Their physical size may or may not comply with similarly rated IEC types.

　　2、Normative references

　　The following standards contain provisions, which through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

　　ANSI C78.30-1997, Procedure for Use in Preparation of Incandescent Lamp Space Drawings

　　ANSI/IEC C78.60360-2002, Standard Method of Measurement of Lamp Cap Temperature Rise

　　ANSI C79.1-2002, Nomenclature for Glass Bulbs Intended for Use with Electric Lamps

　　ANSI C81.61-1990 (R1996), Electrical Lamp Bases

　　ANSI C81.63-1991 (R1996), Gauges for Electrical Lamp Bases and Lampholders

　　ANSI/IEC 60432:1-2002, Incandescent Lamps - Safety Specifications - Tungsten Filament Lamps for Domestic and Similar General Lighting Purposes - Part 1

　　IESNA LM-45-2000, IESNA Approved Method for Electrical and Photometric Measurements of General Service Incandescent Filament Lamps

　　IESNA LM-54-1999, IESNA Guide to Lamp Seasoning

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