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lumen

Abbreviation: lm. Visible power output of light, generated light. Projector light output is measured in ANSI lumens. Higher lumen number means brighter image for given image size.

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lumen

A unit of measurement of Incident light. Lumens, like Lux, flux, candela, Foot Candles, foot lamberts, and Watt/seconds, were created by scientists and engineers to confuse artists.
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