勒克斯，照度单位，为距离一个光强的1cd的光源，在1米处接受的照明强度。
当照度低于约1勒克司时，锥状细胞就不再起作用。
When the lighting level falls below about 1 lux the cones cease to act.
当太阳能电池板完全充电的光照强度是400至500勒克司在其出发点。
When the solar panel is fully charged the light intensity is 400 to 500 lux at its starting point.
防雨，防篡改的相机有540线的分辨率，0.5勒克司的灵敏度，和12伏直流电作业。
The weatherproof, tamperproof cameras feature 540 lines of resolution, 0.5 lux sensitivity, and 12 VDC operation.
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