cie

17-25-087

beam spread

total angle within which the illuminance on a plane normal to the axis of a beam exceeds 10 % of the maximum illuminance

Note 1 to entry: Sometimes the beam spread is calculated at 50 % of the maximum illuminance.

Note 2 to entry: This entry was numbered 17-85 in CIE S 017:2011.

Publication date: 2020-12
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