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General A shapes

A15 bulb shape and size

A15 is the compact a-shape bulb designation. Its nominal maximum diameter is 1.875 inches. Confirm overall length inside a globe or cover. 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 A15 tells you

Shape
compact A-shape bulb
Nominal diameter
1.875 in (48 mm)
Typical bases
E26, E17
Common uses
ceiling fans, appliances, small lamps

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 A15

  • Confirm overall length inside a globe or cover.
  • A15 does not mean E17 or appliance-rated.

Sources

Reference method

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