Difference between revisions of "Luminous fan beam"

Revision as of 00:00, 25 February 2009

2-1-090

(Luminous) Fan Beam

A beam in which the light is concentrated in and about a single plane, usually horizontal.

The angular spread in the plane of concentration may cover either 360 degrees or a smaller angle.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

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