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Law illumination light intensity determined by two factors : ( 1 ) Light emission intensity ,Men Nike Air Max 2013; ( 2 ) is irradiated object and the distance between the light source ,nike mercurial cr7 2013. Under illumination with artificial light source is inversely proportional to the square of the distance that E = I / R E is illuminance ,Nike Total90? R is the distance between the object to the light source as the light source luminous intensity I