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Understanding Lumens
The light output of projectors (including video
projectors) is typically measured in lumens. A standardized procedure for
testing projectors has been established by the American National Standards
Institute, which involves averaging together several measurements taken at
different positions.[1] For marketing purposes, the luminous flux of
projectors that have been tested according to this procedure may be quoted
in "ANSI lumens", to distinguish devices that have been so tested from those
tested by other methods. ANSI lumen measurements are in general more
accurate than the other measurement techniques used in the projector
industry.[2] This allows projectors to be more easily compared on the basis
of their brightness specifications.
Incandescent light bulb emits approximately 1700 lumens in
North America and around 1300 lumens in 220V areas of the world.
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