The measurement distance changes the brightness

Because of the distance of the inverse square law "too famous, that will make people think. When the light from the light source after the departure of photometric quantities will decay; in fact, brightness (if it is not strong to equal brightness surface) is not affected by the photometric distance remained unchanged. For example, people know that the CRT TV, the viewing distance has changed but the brightness is not the same. When the sensitivity of the luminance meter is not enough, it seems to be better than the object. In fact, the same is true of the luminance meter, and even if the metering distance is changed, it is impossible to increase the brightness of the luminance meter.

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