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. 地表水平辐射是单位时间内投射到单位面积水平表面上的太阳辐射能量，通常单位为 w/m²。地表水平辐射由两部分构成：直接辐射和散射辐射，即 地表水平辐射 = 直接辐射 + 散射辐射 但在.
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