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2 LITTERATURE REVIEW 2.7 (Natural) Light in psychiatric treatment Being exposed to natural light is important for wellbeing, both psychiatrical- ly and somatically. Hypothetically it is healthier to be outside in the natural light, than inside in artificial light, as natural light, temperature and humidity provides us with an understanding of both season and time of day on top of the exposure to natural light. Natural light levels will vary according to the weather conditions, but even on an overcast day, the light levels will be much higher and have a higher influence on the SNC and circadian rhythm. (#Graphic illustration of weather condition and illuminance) Living in the Northern hemisphere it is crucial to get a daily dose of Vitamin D [section 2.7.1] to stay healthy and fight SAD during the dark winter months. (Boyce, Hunter and Howlett, 2003; West, Jennum, et al., 2017) Some CL schemes mimic the natural sunrise and sunset in simulated dawn/ dusk transitions according to the daily schedule and not according to sea- son in order to imitate the “optimal” length of day and reset the biological clock. Findings suggest that this approach shows better results in seasonal depression like SAD than in non-seasonal depression. (Terman et al., 1989; Wehr, Aeschbach and Duncan, 2001; Fontana Gasio et al., 2003) The difference in natural and artificial light is connected to more than intensity and Correlated Colour temperature (CCT). Natural light is dynam- ic, the nature of the light will change over the course of a day according to time, season, weather conditions and location. When natural light and artifi- cial meet in a space, something happens to the atmosphere and aesthetics of human perception. (Volf, 2011) Hypothetically this can be mimicked by dynamic daylight sensors, adjusting the artificial light to the outdoor day- light conditions, but Figure 11 illustrates how different the human response « Figure 11: melatonin response compared to CS value of natural and incandescent light (Rea and Figueiro, 2016) » Figure 12, Spectrum of sunlight; direct, overcast, and indirect (blue sky) Wikimedia commons Master thesis · MSc Lighting Design · Pernille Bech-Larsen · Fall 2017 30PDF Image | Healing with light
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