环境光线测试仪主要用于环境光线强度测试，借以发现光线强弱是否符合我们生理需要。
Environmental light testing equipment is mainly used to test intensity of ambient light. Its purpose is to find out whether intensity of the light meets our physiological needs.
如噪声、光线强弱热冷都可导致失眠多梦，过饱或饥饿，临睡前剧烈运动及作息无规律都可影响睡眠。
Such as noise, light intensity of hot and cold can cause insomnia, fullness or hunger, strenuous exercise and rest before going to bed can affect sleep, irregular.
由于光圈控制着进入相机的光线总量，也就是说曝光强弱可以由光圈来控制。
Since the amount of light reaching the camera is dependent on the aperture, the overall exposure is altered by changes in aperture.
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