"Impression of Brightness of a Space" Judged by Information from the Entire Space

概要

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A new evaluation method for "brightness of a space" was investigated. First, we have examined the basic relationship between arrival direction of the light and brightness by using the full-scale model. The results are as follows : 1) Brightness changed due to the subject's action, even if the condition of the light was absolutely the same. 2) The light from horizontal direction is more effective for brightness. 3) Brightness changed due to the balance of arrival direction of the light, even if the total amount of the light is same. Next, the measurement tool for obtaining data of the light that comes from all directions was developed. We examined two effects of "quantity of the light" and "the spatial balance of the light" on the brightness of the space using got value from the tool. As a result, we discovered that former can be explained at the value which horizontally integrated 360° in the weighting of (1+cosθ)/2 and latter can be explained at the angle of visibility and directional diffusivity.
社団法人照明学会の論文