The improved Iso-daylight-facor Diagrams are described for calculating the direct daylight-factor by using the images of solid angle projection diagram, convex mirror and fish-eye lens.
We devised two types of the diagrarm for each of the above three images and were able to use one of them according to shape of light source.
We compared theoretical values to experimental values about the direct daylight-factor of some examples, so made sure to put these methods to practical use.
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