| 摘要 |
PROBLEM TO BE SOLVED: To provide a light environment for giving desired illumination intensity to a working area and improving concentration by illuminating the working area around working objects and its vicinity at different color temperatures and forming a definite illumination gradient at an illumination boundary. SOLUTION: A transparent glass 4 with color temperature changing property is arranged to show an illumination environment, where a working area and its vicinity exist. At a boundary between the illumination intensity Ei of the working area and the illumination intensity Eo of its vicinity, an illumination gradientΔE as a difference between the illumination intensities in terms of a distance is 80<=ΔE<=400(1x/cm). 100<=Mi, Mo<=400 and (1.38.Mi-260)<=Mo<=(1.38.Mi-40) also apply, where Mi is the color temperature of light to illuminate the working area and Mo is the color temperature of light to illuminate its vicinity. The light environment, where a worker shows a high concentration, can thus be realized and energy saving can be attained. |
