beam angle

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.
Contributors: , Created by , February 5th, 2009 at 12:48 AM
Last edited by , July 3rd, 2010 at 11:18 AM
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