Low light levels are considered 15-30 footcandles, and high light levels are considered in the 50-100 foot candle range.
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.
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。
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