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Decorative and candle shapes

C9 bulb shape and size

C9 is the cone-shaped decorative bulb designation. Its nominal maximum diameter is 1.125 inches. Check the string or socket voltage. The base, voltage, light output, and exact overall length come from the individual lamp specification.

Representative family profile and nominal maximum diameter only. Overall length is not to scale, and the base is intentionally omitted.

Dimensions

What C9 tells you

Shape
cone-shaped decorative bulb
Nominal diameter
1.125 in (29 mm)
Typical bases
E17, E12
Common uses
holiday strings, outline lighting, decorative fixtures

The diameter is part of the naming system, not a full dimension drawing. Individual models can differ in overall length, neck profile, optics, and manufacturing tolerance. Use the maker's drawing when the fit is close.

At the fixture

Four other details to record

  1. Read the base code and voltage on the old lamp or fixture label.
  2. Compare the published maximum diameter and overall length with the available space.
  3. Record lumens, beam angle where relevant, color temperature, and dimming behavior.
  4. Look for the enclosure, location, temperature, or vibration rating required by the fixture.

Easy to miss

Notes for C9

  • Check the string or socket voltage.
  • C9 and E17 describe different parts of the lamp.

Sources

Reference method

BulbMatch uses the U.S. eighth-inch naming convention as a nominal shape reference and keeps model-specific dimensions separate.