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Decorative and candle shapes

C7 bulb shape and size

C7 is the small cone-shaped bulb designation. Its nominal maximum diameter is 0.875 inches. String-light voltage may differ from household 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 C7 tells you

Shape
small cone-shaped bulb
Nominal diameter
0.875 in (22 mm)
Typical bases
E12
Common uses
night lights, holiday strings, sign lights

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 C7

  • String-light voltage may differ from household voltage.
  • A matching E12 base does not prove electrical compatibility.

Sources

Reference method

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