Investigation of Indoor Lighting Environment in The Houses where Aged People Live

Kashiwa, Takahiro; Iwata, Tatsuya; Kimura, Ken‐ichi

doi:10.2150/jieij1980.80.appendix_182

Cited by 1 publication

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“…According to the survey by Inoue and Ohno (1994), the center value of the light intensity in a living room was 200 lx, ranging from 50 lx to 850 lx at 80% range during the daytime while it was 170 lx, ranging from 70 lx to 330 lx at 80% range during the nighttime. Kashiwa et al (1996) reported that the most frequent light intensity in a living room was 300 lx during the daytime in the 29 residences where aged people lived, while it was 200 lx during the nighttime. The present life style under these light conditions is greatly different from the natural environment, and something new during the course of human evolution.…”

Section: Light In the Living Circumstancementioning

confidence: 99%

The Influence of Different Wavelengths of Light on Human Biological Rhythms.

Morita

Tokura

1998

Appl Human Sci

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Abstract. The purpose of this review was to discuss the influence of light on humans in the environment, focusing the relation between the quality of light and human biological rhythms, and also to apply the results on lighting planning to a living space which takes into account human health and comfort. The main discussions were as follows: 1) The effects of light on the behavior of core temperature and melatonin vary depending on its wavelength. Light with long wavelengths, such as light with a low color temperature and red light, had little influence on the human biological rhythms. On the other hand, green and blue light -light of mid-short wavelength such as light with a high color temperaturehad a greater influence. 2) From the relation between the stimulus received by each photoreceptor and the inhibition of core temperature and melatonin, it might be concluded that the photoreceptor responsible for transmitting light information that affects biological rhythms is M-cones. 3) A higher light intensity was required in the morning than in the evening to induce the inhibition of melatonin secretion. This result suggests the possibility of existence of a diurnal change of sensitivity of the photoreceptors (M-cones). 4) From all these results, it is proposed in the field of living environment and living engineering that light with a low color temperature should be used for low-level lighting at night, and high-level light with a high color temperature in the morning.(Appl Human Sci, 17 (3): 91-96, 1998)

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Section: Light In the Living Circumstancementioning

confidence: 99%