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정의
광원이 초당 방출하는 가시광선의 총량을 측정하는 SI 유도 광속 단위(1 lm = 1 cd·sr).
설명
A 60-watt incandescent bulb emits about 800 lumens; an equivalent LED uses only 8–10 watts for the same output. A candle produces roughly 12–13 lumens. Unlike watts (which measure power input), lumens measure actual light output — making them the correct metric for comparing bulb brightness across different technologies.
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