JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN

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This research targeted Takekoma Town in Rikuzen-Takata City, Iwate where large numbers of temporary buildings have been built after the Great East Japan Earthquake in 2011. The research aimed to install adequate light fixtures that guide people to higher ground and provide them with safety and convenience in daily life. The lighting design was based on the results of the examination of several field surveys and previous researches. A total of 179 lights, such as incandescent lamps, were installed. A questionnaire survey of residents was carried out before and after the lighting installation. As a result, it was confirmed that the recognition of entrances for evacuation and evacuation directions that guide people to higher ground had increased enough compared with the previous situation. It was also confirmed that in the temporary shopping district and construction office, the surrounding visibility and safety had been improved by the lighting. The lighting experiment was conducted for about one month in September 2013. Most light fixtures have been continuously maintained by residents even after the end of the experiment.

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This study examined the relationships among illuminance level, light source spectral distribution and observation sample colors by subjectively evaluating color samples under various illuminations. It also clarified the evaluation structure when impression of color samples under various illuminations were sujectively observed. Four types of lamps (Ra19-Ra96), two illumination levels (700 lx, 10 lx), and three types of samples (two-color ones, multi-color arrays, pictures) were used. The results were found to depend on whether the sample contained red. Factor analysis with “color quality” and “preference” as factors revealed that subjective brightness and vividness of the red were important in forming a subjective impression of the samples.

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