Lumen (unit)
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The lumen is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs from power, which encompasses all electromagnetic waves emit
André Blondel, creator of the lumen
A 470-lumen LED lamp. It consumes about one sixth the electrical power of an incandescent light bulb producing the same light.
Luminous flux
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In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of electromagnetic radiation, in that lumino
Lumen (unit)
…The lumen (symbol: lm) is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs from power (radiant flux), which encompasses all…
Diagram of luminous flux emitted within a certain solid angle.
Integrating sphere used for measuring the luminous flux of a light source