| Summary: | 碩士 === 元智大學 === 工業工程與管理學系 === 101 === The purpose of this research is to investigate the elders and teenagers’ physiological and psychological responses for different shapes and correlated color temperature of LED ceiling light. This research also hopes to design a suitable lighting environment to provide comfortable lighting surroundings for different age groups. As the current literature, most of them were exploring two combinations, illumination and correlated color temperature. However, few studies had investigated the physiological and psychological responses for different color temperature with different lighting shapes. Kruithof (1941) indicated that the human sense of sight can be directly affected by lighting equipment, he claimed that people prefer high illuminance with high color temperature and low illuminance with low color temperature, these comfortable range also called Kruithof Curve. It means that human physiological and psychological sensations and perceptions can also be affected by varied lighting conditions. Kens and Kers (2000) pointed out that psychological feelings and perceptions can be affected by different lighting condition and different aging groups. Therefore, based on these studies, the purpose of this study is to investigate the elders and teenagers’ physiological and psychological responses for different shapes and correlated color temperature of LED ceiling light.
This study used five LED ceiling lamps, each exhibits a different geometric shape to create diverse lighting surroundings in a simulated living room at three different color temperatures and under low illumination. To obtain physiological data from participants of different age groups, we measured the galvanic skin response, heart rate, and skin temperature of the little finger of each participant. To obtain psychological data, we used subjective questionnaires to measure the feeling of the participants, the subjective questionnaires including visual fatigue questionnaire, sense of loss questionnaire and preference questionnaire.
Based on the physiological results of this study, we found that people in low illuminance environment prefer 3000K and dislike 5600K. The result of this research confirmed that 3000K and 5600K with low illuminance still fit in Kruithof Curve. People felt relax when it was the lighting environment projected by a rectangle shape. In Knez and Kers’s (2000) study pointed out teenagers and elders had negative emotion respectively in 3000K and 4000K. However, in our study found all the lighting environment will not be affected by the age difference. These results can show the entire lighting environment is suitable for all ages of people. In psychological part, all of the subjective questionnaires had no significance on CCT, shapes and aging groups. It means that all the lighting environments of this research do not cause people visual discomfort it does not cause people to have a negative emotional, either. These finding above can provide lighting manufacturers with a reference for improving product quality.
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