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Reflector shapes

PAR20 bulb shape and size

PAR20 is the par reflector bulb designation. Its nominal maximum diameter is 2.5 inches. Match beam angle as well as diameter. 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 PAR20 tells you

Shape
PAR reflector bulb
Nominal diameter
2.5 in (64 mm)
Typical bases
E26
Common uses
track lights, small recessed cans, accent 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 PAR20

  • Match beam angle as well as diameter.
  • Outdoor use requires an appropriate location rating.

Sources

Reference method

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