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2 LITTERATURE REVIEW luminating screens with Blue diodes emitting 40 lux of 470-nm caused more significant disruption in the circadian rhythm after two hours of use, than after only one hour, compared to zero. (Figure 10) shows the spectral trans- mittance of the orange-tinted glasses compared to the SPD of iPad and blue LEDs used for the experiment. (Wood et al., 2013) The attention on the sleep related problems caused by self-illuminating screens and the still rising demand for screen based work has lately resulted in a line of research based programmes developed to will filter out the short wavelengths from screens. Programmes like f.lux can to some extend func- tion as the orange-tinted glasses in Figure 10, while the dynamic website fluxometer.com can detect the percentage of Melatonin suppression from the current screen conditions. (Gooley et al., 2011) Negative effects are not only connected to insomnia, on the long run, people with suppressed Melatonin levels and trouble sleeping could also be more prone to developing depression later in life. (Chellappa et al., no date; Pauley, 2004; Webb, 2006; Zaki et al., 2011; Münch et al., 2014; Halper, 2016; West, Simonsen, et al., 2017) Positive use of short wavelength light, outside phase shifting, has been seen in treatment of neonatal babies and patients with sensitive skin to avoid the UVA, UVB and UVC from natural daylight (Boyce, Hunter and Howlett, 2003) Master thesis · MSc Lighting Design · Pernille Bech-Larsen · Fall 2017 29 Figure 10, SPD transmittance of the orange-tinted glasses compared to the SPD of iPad and blue LEDs (Wood et al., 2013)PDF Image | Healing with light
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