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From a related post: Lumens is the SI unit for luminous flux, which is essentially the total amount of light in the visible spectrum emitted by a source in all directions. Lumens does not depend on distance from the light source, because it must be measured in all directions. A related unit, lux, measures the amount of light hitting a certain surface ...


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Lumen: The lumen is essentially the amount of light emitted from the point source. A candela is roughly the amount of light emitted from one lit candlestick in any direction over an angular span. A lumen is considered the luminous flux of that light source and can be found by multiplying the intensity (the candela) by the angular span over which the light is ...



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