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Reflector shapes

BR20 bulb shape and size

BR20 is the small bulged-reflector bulb designation. Its nominal maximum diameter is 2.5 inches. Beam spread and neck length vary. 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 BR20 tells you

Shape
small bulged-reflector bulb
Nominal diameter
2.5 in (64 mm)
Typical bases
E26
Common uses
small recessed cans, track 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 BR20

  • Beam spread and neck length vary.
  • Do not substitute only by face diameter.

Sources

Reference method

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