IEVref:845-09-30ID:
Language:enStatus: Obsolete
Term: half-peak divergence
Synonym1: one-half-peak spread (of a projector, in a specified plane) US
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Definition: angular extent of all the radius vectors of the polar curve of luminous intensity in the specified plane having lengths greater than 50% of the maximum

NOTE – In British practice beam spread relates to the total angle within which the illuminance on a plane normal to the axis of the beam exceeds 10% of the maximum.


Publication date:1987
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