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http://blog.alighting.cn/wenlinroom/archive/2010/5/23/45349.html2010/5/23 13:12:00
被照面而言，常用落在其单位面积上的光通量多少来衡量它被照射的程度，这就是照度，符号为e，它表示被照面上的光通量密度。当光通量φ均匀分布在被照表面A上时，则被照面的照度为e=φ/A。照
http://blog.alighting.cn/wenlinroom/archive/2010/5/22/45326.html2010/5/22 22:24:00
下三图较为形象地加以说明： 图2 led照明热传路径（A） 图
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http://blog.alighting.cn/dou674016/archive/2010/5/22/45302.html2010/5/22 16:17:00
