The importance of evacuation to higher ground away from a tsunami safely at night has been recognized right after the Great East Japan Earthquake in 2011. One of principal methods of the evacuation lighting to higher ground is visualizing geographical features and the characteristics of evacuation areas by lights. The reasonable and energy efficient lighting could be realized by designing according to the required performances for each location. The improvement of evacuation lighting would lead regional development in disaster areas. It does not require a long period of time and a big budget as compared with other infrastructure constructions. This paper has reported the achievement of lighting social experiments in which evacuation lighting equipment was placed to disaster areas.
We had been running numerous workshops to create locally character 'Kitamoto KAO project' for 4 years. In this project, the lighting experiments were conducted to adopt the design process based on the human activities. The lighting environment was improved in consideration of abolishing surrounding darkness and walking safety. At the junction in front of the station, this lighting design succeeded in keeping people to avoid various accidents. After the improvement was completed, multiple events the characteristic of the square is visualized have been held.
Various evaluation methods of color quality are proposed and discussed as alternatives or supplements of CRI. In this article, we show the result of optimization of color quality for landscape lighting based on feeling of contrast index (FCI). Color appearance of green, red and yellow plants was evaluated under 29 type illuminants. According to the result of experiments, higher FCI illuminants show the color of plants more attractively even if they don't have good CIE Ra values. On the other hand, too high FCI illuminants make unnatural appearance for 1/3 observers. So, there is optimal value of FCI for appearance of plants. The result shows that light sources which show the color of plants attractively can be developed by using FCI.
We have conducted research on the actual situation and verification experiments, focusing on the visibility and illuminance. Our research results show that the most common length of an installation interval of the street lighting is too long to meet Japanese standards of street lighting. The length interval is about 35 meters. We also found that only a part of the large city's illuminance level is able to meet the standards. The experiments were conducted under the experimental street environment using temporary street lighting. We measured the visibility and illuminance under two different installation interval lengths of the street lighting, which were 30 meters and 40 meters. In consequence, we observed that even when the street environment meets the standards, the standard's "effect of the illuminance" does not always get the desired effect.
In this paper, the author describes an outline of a three-dimensional video and its display methods for evaluating the effects of lighting environments on sense of safety in a nighttime street. In addition, results of psychological experiments on several situations are introduced.