lumen
lumen 英 [ˈlu:men] 美 [ˈlumən]
n. 流明（光束的能量单位）；（管状器官内的）内腔
名词复数:lumens
- The lumen is a unit of measurement for the brightness of light. If a light bulb is blindingly bright, it produces a lot of lumens.
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- n. 流明（光束的能量单位）；（管状器官内的）内腔
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1. CFL brightness decreases over time, but if you buy higher-watt CFLs they should maintain a higher lumen output for a longer period of time.
在使用过程中，节能灯的亮度会逐渐降低。 但是如果你购买了高瓦的节能灯，那它能在更长的时间内提供更高的流明输出。
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2. 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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3. The light perceived by the human eye is measured in units called lumen-hours.
人类眼睛所观测到的光是以流明小时这种单位度量的。
- lumen (n.) unit of luminosity, 1897, coined in French 1894 by French physicist André-Eugène Blondel (1863-1938) from Latin lumen "light" (n.), from suffixed form of PIE root *leuk- "light, brightness." Earlier it was used in anatomy for "an opening or passageway" (1873).
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