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beam angle

Discussion in 'Wiki' started by DaveySimps, Feb 5, 2009.

  1. DaveySimps

    DaveySimps CBMod CB Mods Premium Member

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    Performing Arts Center Manager
    Macomb, MI
    The angle of a cone of light encompassing the central part of the beam out to where where the intensity drops to 50% of the center. Sometimes referred to as "1/2 cut-off angle" on old fixture's photometric sheets.

    See also field angle.
    Last edited by a moderator: Feb 5, 2010

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