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The development of blue color LED (Light Emitting Diode) made it possible to express manifold light colors by mixing the light colors such as red, green, and blue. The popularization of unusual light LED colors should get started owing to the development of blue color LED. The new light environment should bring about unexpected psychological and physiological effects and the basic research about light colors will be more necessary in the future. This research is about the psychological and physiological effects according to LED light colors and the purpose is to determine on the unpleasant range and pleasant range from LED light saturation. The research progressed by changing the saturation (up and down) of the three primary colors (Red, Green, Blue) and three compound colors (Yellow, Magenta, Cyan). All six species of light colors were used and the research progressed using two experiments color change and discomfort change. As a result, tint sensitivity and discomfort increase in case of approaching to pure color. In the range of feeling tint, the range of not feeling discomfort exists. The stage of evaluation of tint sensitivity and discomfort is specified to CIE 1931 Chromaticity diagram.

BASIC STUDY ON TINT AND DISCOMFORT CAUSED BY LED LIGHTING COLORS IN ARCHITECTURAL SPACES