scope:

This standard sets forth the physical and electrical characteristics of the group of incandescent lamps that have A, G, PS, and similar bulb shapes with E39 mogul screw (single- or double-wntact) bases. Only clear, inside frost, and white bulb finishes are acknowledged. Excluded from coverage are tungstenhalogen lamps and projection lamps. In addition to common-line voitage lamps, listed in Table 1 , a group of series burning lamps rated at constant current are covered in Table 2.

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

ANSI C78.20-1995, American National Standard for Electric Lamps - Incandescent Lamps - A, G, PS, and Similar Shapes with E26 Medium Screw Bases

ANSI C78.21-1995, American National Standard for Electric Lamps - Incandescent Lamps - PAR and R Shapes

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

At the time of issuance of this standard, there was no comparable standard published by the International Electrotechnical Commission (IEC).