Abstract
Recently LED (Lighting Emitting Diode) lighting sources are applied not only for displays like LED BLU (back light unit) TV but also for general lighting like LED lamps for home and office. The color temperature, or chromaticity, and brightness of LED lighting can be easily controlled. Preferred combinations between illuminance and color temperature of lighting depend on daily living activities (Oi et al., 2007 Symposium on Design of Artificial Environments 214–215). Changes in intensity can be more easily detected than color changes (Almeida et al., 2009 Perception38 1109–1117). We investigated whether the illumination stimuli of LED lighting can enhance attention and relaxation level by controlling color temperature and illuminance according to activities. EEG signals are used to estimate attention and relaxation levels of human subjects under different lighting conditions. Nine participants with normal eye sight and color vision participated in the experiments with four different activities under diffe...
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