llumination and Luminance

 The concepts of illumination and luminance are associated with the quantity of light falling on or emanating from a surface, respectively. Illumination is related to the amount of light falling on a surface or an object. Luminance is related to the amount of light coming from an object, such as a video display terminal or a wall. 

Luminance is associated with our subjective impression of brightness. The farther you move away from a light source, the more the intensity of illumination. In fact, it decreases as the square of the distance. If you double the distance between an object and a light source, the illuminance measured at the object drops to one-fourth its previous level. sonable range of distances. The reason for this has to do with the way luminance is defined mathematically. Our experience confirms that a wall doesn’t become less bright simply because we move away from it.

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