... illuminance meter【摄】照度计 unit of illuminance照度单位 retinal illuminance视网膜照度 ...
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一般认为低照明介于15 - 30英尺烛光(照明单位，指每英尺距离内之照度)，高照明介于50 - 100英尺烛光之间。
Low light levels are considered 15-30 footcandles, and high light levels are considered in the 50-100 foot candle range.
此外，芯片的制作工艺也需要入射光线通过淀积在硅片上的电路，这使得光照度(光源照射在被照物体单位面积上的光通量)降低。
On top of that, the way chips are made requires the incoming light to pass through circuitry that has been deposited on to the silicon, reducing the level of illumination.
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