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Lumen is the unit of measure for the light energy which flows in air. An ANSI lumen is a standardised measurement of the average light output of a projector measured at different areas of the screen.
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hitachidigitalmedia.com
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An ANSI lumen is a measure of brightness put out by a projection device, as standardized by the American National Standards Institute. Note these are not comparable to "lumens" expressed in non-ANSI terms (and used to measure, for example, the output of overhead projectors).
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unitedvisual.com
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Developed by the American National Standards Institute (ANSI), lumens are the industry's standard measurement of projector brightness.
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What is an ANSI lumen?
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