This paper deals with the distribution of light incident from sky through skylight wi 皿dow ontQ interior surfaces of a room with a shape of rectangular prism . As for sky conditions , this paper assumes CIE overcast sky and uniform sky . This paper presents a series of equations for calculat − ing direct illuminance at an arbitfary point on an arbitrary interior surface and . luminous flux inci− dent directly on an arbitrary interior surface . In addition , this paper presents a couple of graphs that illustrate ratio of luminous flux distributeCl Qn an interior surface to total luminous flux inci ・ dent inside through skylight window . Keyworzts :light distribution in inten
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