For the really dim things astronomers look at, the number of photons of light coming from a source is so small that each one counts.
天文学家观看的那些东西确实非常暗淡，来自它们的光子太少了，每一个都很要紧。
The number of photons collected by a pixel, and therefore the pixel value, is a measure of the flux, and thus of the brightness of the light source.
一个像素所收集到的光量子数，也就是像素值，是测量的光通量的方式，即反映了光源的亮度。
The general designs of space probe has been done. Material, structure, selection of light source, CCD camera type and number are analyzed in this paper.
完成了测棒系统的总体结构设计，对测棒系统的材料、结构，发光特征点的选取，CCD摄像机的类型及数目的选择进行了比较全面的分析。
LED light-bulbs (patent number:)5, DC 12 V and 24 V LED flat light-emitting lamp panel solar PV system is the preferred source.
LED调光灯泡（专利号：）5，直流12伏和24伏的LED平面发光灯盘是太阳能光伏发电系统的首选光源。
LED light-bulbs (patent number:)5, DC 12 V and 24 V LED flat light-emitting lamp panel solar PV system is the preferred source.
LED调光灯泡（专利号：）5，直流12伏和24伏的LED平面发光灯盘是太阳能光伏发电系统的首选光源。
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