Abstract
By the recent studies have been revealed that the strong light at night is one of the significant factors on the circadian rhythm. Disturbance in the secretion of melatonin develop as a consequence of biological rhythm's secretion. Secretion of melatonin is said that it involved in health risk and various diseases insomnia, depression, and obesity. Also insomnia risk often seen in elderly than young people. While exposure to light at night adversely affects the biological body, the exposure of sunlight has also been reported that gives a good effect on the organism of the elderly body. There is no doubt that in the modern house, lighting environment of the night has given a variety of effects on our bodies. However, it is not possible to separate the artificial lighting in the modern life. There is a need to go ring the alarm bells about the impact on the human body by providing a standard for lighting design.
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