Lumen (lm) is a unit used to quantify the brightness of a light source. It represents the total amount of light emitted by a light source per unit time. Simply put, lumens are a standard for measuring the "luminosity" of a light source. For example, when we say a light bulb has 800 lumens, it means that when operating, it emits a total of 800 lumens of light per second.
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