Beam angle

Beam angle is a measure of angular width or diameter of the beam of light emitted from products used in architectural lighting, landscape lighting, stage lighting, and other lighting applications. It is known to be an imperfect gauge of perceived beam width. However, the beam angle is for example used to determine the minimum test distance required for acceptable error in photometry.

Several definitions of beam angle are in common use. This article compares them and illustrates how they relate to each other and to related concepts.

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