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SPATIAL BRIGHTNESS EVALUATION FOR OFFICE ROOM WITH UNEVEN DISTLIBUTION OF LIGHT

Several new spatial brightness evaluation methods have been proposed in recent years. Although these new methods provide us to evaluate spatial brightness which is difficult by measuring horizontal illuminance, there is little agreement for a room with uneven distribution of light. In this study, we examined the relationship between spatial brightness, suitability of spatial brightness and luminance distribution for such a non-uniformly illuminated room. We found applied conditions of averaged luminance to estimate spatial brightness or suitability of spatial brightness for uneven lighting environment. We also found that suitability of spatial brightness correlated to spatial brightness evaluation well. Several new spatial brightness evaluation methods have been proposed in recent years. These new methods provide us to evaluate spatial brightness which is difficult by measuring horizontal illuminance. Calculation process common to each method is to calculate the average luminance of the field of view. When there is no uneven distribution of light such that one part of the space is extremely bright or darker than the other parts, the spatial brightness could be roughly evaluated by the arithmetic mean luminance of the entire field of view to be evaluated. However, the average luminance of