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.
如照明设计应以低照度和中等照度为主，不能使用“长命灯”，必须随到随开，随走随关，避免洞穴温度过高；
Such as lighting design should be based illumination and middle-illumination, can not use "long lights, " pick to be opened, as-you-go clearance, to avoid the temperature increased in the cave;
如照明设计应以低照度和中等照度为主，不能使用“长命灯”，必须随到随开，随走随关，避免洞穴温度过高；
Such as lighting design should be based illumination and middle-illumination, can not use "long lights, " pick to be opened, as-you-go clearance, to avoid the temperature increased in the cave;
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