Investigation of Lighting Condition for Elderly People Focused on Appearance of Objects

概要

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This study investigates lighting conditions for elderly people under which object is perceived as “kirei”, according to implications of clarity and preference. An experiment was conducted using Semantic Differential method with young and elderly subjects to assess the appearance of objects under white LEDs, incandescent lamps, and fluorescent lamps. Results suggest that lighting under which objects are perceived as “kirei” for elderly people is that from incandescent lamps. Additional study is necessary to determine whether this result was obtained from the correlated color temperature or lamp-specific characteristics. Furthermore, assessment structural analysis was conducted using Graphical Modeling per age groups. These models suggest age-related differences of the assessment structure under which objects are perceived as “kirei”, especially the relation between “kirei” and brightness.