The Art of Illumination

Cover The Art of Illumination
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Theoreti- cally, one is at liberty to integrate the light received at a given, point on the working plane from all directions, but practically a large part of the oblique light is either cut off or ineffective. On the other hand, it does contribute, jto the general diffused illumi- nation in the room. The useful illumination at a point, therefore, is materially greater than that obtained only from the nearby lights, but materially less than the theoretically jntegrated effects of all the lights.... From a practical standpoint, the presence of these latter luminous sources is equivalent to raising the diffuse component of the light to a point somewhat greater than that which would be indicated merely by the coefficient of reflection of the surfaces applied to the lights really effective in direct illumination.
Experience shows that in dealing with rooms of this class under ordinary conditions of lightness of wall, one must supply light on the basis of 1. 5 to 2 square feet per rated candle power.


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