Healing with light

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Healing with light ( healing-with-light )

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2 LITTERATURE REVIEW Connecting sleep depression and shift-work, and by this Melatonin to can- cer is an important focus, as the biological clock is highly effected by arti- ficial light at night (ALAN). Breast cancer in female night shift workers, has been studied among nurses and strong connections were argued. ALAN should be of high importance when designing night lighting for health care environments. Effects of different brightness and wavelengths on Melatonin are still being investigated, but tendencies towards avoiding strong blue light are domi- nant. (Schernhammer et al., 2001; Pauley, 2004; Figueiro and Rea, 2010; Cho et al., 2015) In a study By Wright et al, 204, where “Two long wavelengths, 595 nm (amber) and 660 nm (red) and three shorter wavelengths, 470 nm (blue), 497 nm (blue/green), and 525 nm (green) were compared with a no- light control condition.” significant results suggest that the human circadian system reacts stronger to shorter wavelengths. (Wright, Lack and Kennaway, 2004) Low wavelength light can be succesfully blocked by orange tinted googles. (Kayomov et al, 2005) Interest in the role that light plays in the nocturnal melatonin segregation and production is growing. Linking the biological clock to light, sleep and mental illness, can open new areas for investigation of the effects of “healing light”. (Figueiro, Rea and Bullough, 2006) « Figures 4 illustrates how bright light effects Melatonin levels (Reiter et al, 2007) » Figures 5, blocking low wavelength light with googles (Kayumov et al, 2005) Master thesis · MSc Lighting Design · Pernille Bech-Larsen · Fall 2017 20

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