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N the derived SI unit of luminous flux; the flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela 流明; 光束强度单位 ( symbol: lm)
Each has an opening to the colonic lumen through a narrow neck.
每个憩室有一个窄的开口通向结肠腔。
In 1700 a typical Briton consumed 580 lumen-hours in the course of a year, from candles, wood and oil.
在1700年一个普通的英国人一年消耗580流明时燃烧蜡烛、木材和油产生的光。
This is mainly because of the two ideas behind a LEDs true lifespan: Lumen Depreciation and Useful Life.
这主要是因为LED真实的寿命后面隐藏的两大概念：流明衰减和有用时间。
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