Light on an object, we say that the object surface is lighting. By the degree of surface light is light, can use this metric to represent the light illumination. Illumination this quantity is defined as the luminous flux of falls on one side cell divided by the surface area of the business. Illumination unit is called 'lux' ( lx) The luminous flux, when 1 lm uniform irradiation on 1 m2 area, intensity of illumination is equal to the area 1 lx, namely 1 lx = 1 lm / 1 m2. YanZhiXiang
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