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Lumen (symbol: lm The unit of measure for the light energy which flows in air. The total light output from electrical sources is expressed in lumens. A uniform source of one candlepower placed in a sphere emits 12.57 lumens or mean spherical candela equals to 12.57 lumens.

Luminous flux differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.

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  • Wikipedia see Lumen [1]

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