Evaluation on short-wave energy (blue) of LED light sources at night from a viewpoint of non-visual effects

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In this study, we investigated the impact of the red, green, and blue components of polychromatic light-emitting diode (LED) on non-visual effects, i.e., pupillary response and nocturnal light-induced melatonin suppression, and evaluated the impact dependence on the blue-part energy of polychromatic LED light as well as the total LED energy. It was found that, regardless of total light energy, the secretion of melatonin was suppressed greatly depending on how the light source had a blue component. This study suggests that it is necessary to investigate individual variability of physiological responses, such as pupillary response, in addition to the physical properties of the light source.