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.
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