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While fair results may be obtained upon smaller courts, we recommend Diagram showing light court layout for good results that the side of the light court, for offices about 20 feet deep, be three-tenths of the height of the enclosing walls, and very brilliant results may be obtained in a light court the width of which is five-tenths the height. The accompanying illustration, Fig. A, shows the method of treating a square light shaft, the dimensions of which are three-tenths the height of the enclosing walls. Vertical prism plates should be used for the openings in the upper half and canopies in the lower half. It is customary to make the upper one or two canopies of the C canopy and the lower ones of the A, and possibly the lowest one of the 1/C. Also it is sometimes desirable to set out from the wall the lower canopies, in order to get them from under the shadow cast by those immediately above. The window openings should be made as large as practicable.
Diagram showing Luxfer canopy in light shaft     In order to find the relation of the sizes of these canopies, so that they shall deliver into the rooms on each floor substantially the same amount of light, we find the horizontal projection of each one of these from the wall of the court. This is shown by letter P in sketch below. If the top of the canopy is set so as to touch the
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 95