Luminous fan beam: Difference between revisions
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Latest revision as of 09:15, 17 September 2026
(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)
