Luminous fan beam

From International Dictionary of Marine Aids to Navigation
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(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)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM