Daily indoor light exposure: A spectral analysis of ambient light sources and its relevance to occupational dermatology Teo Soleymani, MD, Lorcan M.

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Presentation transcript:

Daily indoor light exposure: A spectral analysis of ambient light sources and its relevance to occupational dermatology Teo Soleymani, MD, Lorcan M. Folan, PhD, Nicholas A. Soter, MD, Nada Elbuluk, MD, MSc, David E. Cohen, MD, MPH Journal of the American Academy of Dermatology Volume 76, Issue 4, Pages 763-765 (April 2017) DOI: 10.1016/j.jaad.2016.11.016 Copyright © 2016 American Academy of Dermatology, Inc. Terms and Conditions

Fig 1 A, iPhone 6 Plus white background, brightness 100%, 1 cm from the screen. B, Apple iPad Pro, white background, brightness 100%, 1 cm from the screen. C, Sharp Aquos light-emitting diode television screen, brightness 100%, 1 cm from the screen. D, Dell liquid crystal display desktop monitor, brightness 100%, 1 cm from the screen. E, Dell liquid crystal display desktop monitor, maximized exposure integration time. (The small peaks in the ultraviolet and deep infrared range are artefactual and not real. Given that the fluence output of the monitor was very small (as demonstrated above), in order to obtain a spectral curve we had to increase exposure integration time and zoom in on the display, hence the detection of artifact on the tail ends). F, Dell liquid crystal display laptop screen, brightness 100%, 1 cm from the screen. Journal of the American Academy of Dermatology 2017 76, 763-765DOI: (10.1016/j.jaad.2016.11.016) Copyright © 2016 American Academy of Dermatology, Inc. Terms and Conditions

Fig 2 A, Compact fluorescent bulb from desktop lamp, 15 cm away from the light source. Notice a clear ultraviolet A light (UVA) peak delineated at 364 nm. There is also a small ultraviolet B light (UVB) peak at 312 nm. B, Compact fluorescent bulb from desktop lamp, 30 cm away from light source. The UVA peak remains but the UVB peak disappears. C, Fluorescent tube bulb from ceiling lights, 15 cm away from the light source. Notice nearly identical UVA and UVB peaks as from the compact fluorescent bulbs above. D, Analysis of fluorescent tube bulb from ceiling light with maximized exposure integration time. This was used to further delineate the specific UV peaks (the visible light peaks appear curved because of saturation of the spectrometer at such high exposure times, which was required to delineate the specific UV wavelengths). There is a clear UVA peak at 364 nm. E, Analysis of fluorescent tube bulb from ceiling light with maximized exposure integration time (same as 2 days). There is a clear UVB peak at 312 nm. F, Fluorescent tube bulb from ceiling lights, 50 cm away from the light source. At this distance, no UV spectra were detected. Journal of the American Academy of Dermatology 2017 76, 763-765DOI: (10.1016/j.jaad.2016.11.016) Copyright © 2016 American Academy of Dermatology, Inc. Terms and Conditions