explain Lumen wave
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The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source per unit of time.
Unit of: Luminous flux
Unit system: SI derived unit
SI base units: 1 cd⋅sr
Symbol: lm
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Lumens measure how much light you are getting from a bulb. More lumens means it's a brighter light; fewer lumens means it's a dimmer light.
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