1 lm的光通量均匀分布在1平方米的表面，即产生1勒克斯 (lux)的照度。 烛光 (candlepower) 是最早定义发光强度的单位，目前基本已弃用。 最早是以一磅白蜡制造出一尺长的蜡烛所燃放出. Lux和lx都指的是 勒克斯。lx是简写。 勒克斯是一个照度单位，它表示了光照的强弱和物体 表面积 被照明程度的量。 勒克斯的含义：当物体被光均匀照射时，在1平方米面积上所得的 光通量.
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