Effects of Blue Light on Physiological Responses(<Special Issue>Psychological / Physiological Effect and Evaluation of Blue Light)

I searched the literatures regarding the lights' behavior on the physiological aspects of humans to find that blue lights do not necessarily have sedative effects. In addition, concerning lights' effects on biological rhythms, it is reported that blue lights are effective; however, addition rules are not established when they try to quantify its level. With the above matters, much knowledge has been accumulated; however, it is still difficult to apply that knowledge freely concerning the blue lights' effect on physiological aspects.