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What is a lumen?

Updated: 8/10/2023
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9y ago

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a measurement of the amount of visible light.

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A lumen is the photometric SI unit for luminous flux -i.e. the rate at which an object emits visible light. By 'visible light', we mean electromagnetic energy perceived by the human eye, and the lumen is based on the frequency of green light, to which the human eye is most sensitive.

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9y ago
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