Abstract
The dynamic evaluation method of visibility can be simplified by introducing the effective luminance concept. The method is based on the two kind of study that are on the visual sensitivity at transient adaptation and on the effective luminance ratio of visual target. To clarify the sensitivity at transient adaptation to make use of the lighting planning, experimants using uniform field were conducted and found followings : (1) The recovery time of sensitivity is determined only by the ratio between pre-adaptation luminance and field luminance, and the relation between the recovery time and the luminance ratio on a full-logarithmic scale is presented by a linear equation. (2) The luminance difference threshold at early stage of adaptation is determined by pre-adaptation luminance, and any changes of field luminance that are under than the adaptation luminance at the stage have no effect on the transient stage of adaptation.
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