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Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance

Smart integrative lighting systems aim to support human health and wellbeing by capitalising on the light-induced effects on circadian rhythms, sleep, and cognitive functions, while optimising the light’s visual aspects like colour fidelity, visual comfort, visual preference, and visibility. Metamer...

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Autores principales: Zandi, Babak, Stefani, Oliver, Herzog, Alexander, Schlangen, Luc J. M., Trinh, Quang Vinh, Khanh, Tran Quoc
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8633386/
https://www.ncbi.nlm.nih.gov/pubmed/34848762
http://dx.doi.org/10.1038/s41598-021-02136-y
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author Zandi, Babak
Stefani, Oliver
Herzog, Alexander
Schlangen, Luc J. M.
Trinh, Quang Vinh
Khanh, Tran Quoc
author_facet Zandi, Babak
Stefani, Oliver
Herzog, Alexander
Schlangen, Luc J. M.
Trinh, Quang Vinh
Khanh, Tran Quoc
author_sort Zandi, Babak
collection PubMed
description Smart integrative lighting systems aim to support human health and wellbeing by capitalising on the light-induced effects on circadian rhythms, sleep, and cognitive functions, while optimising the light’s visual aspects like colour fidelity, visual comfort, visual preference, and visibility. Metameric spectral tuning could be an instrument to solve potential conflicts between the visual preferences of users with respect to illuminance and chromaticity and the circadian consequences of the light exposure, as metamers can selectively modulate melanopsin-based photoreception without affecting visual properties such as chromaticity or illuminance. This work uses a 6-, 8- and 11-channel LED luminaire with fixed illuminance of 250 lx to systematically investigate the metameric tuning range in melanopic equivalent daylight illuminance (EDI) and melanopic daylight efficacy ratio (melanopic DER) for 561 chromaticity coordinates as optimisation targets (2700 K to 7443 K ± Duv 0 to 0.048), while applying colour fidelity index R(f) criteria from the TM-30-20 Annex E recommendations (i.e. R(f) [Formula: see text] 85, R(f,h1) [Formula: see text] 85). Our results reveal that the melanopic tuning range increases with rising CCT to a maximum tuning range in melanopic DER of 0.24 (CCT: 6702 K, Duv: 0.003), 0.29 (CCT: 7443 K, Duv: 0) and 0.30 (CCT: 6702, Duv: 0.006), depending on the luminaire’s channel number of 6, 8 or 11, respectively. This allows to vary the melanopic EDI from 212.5–227.5 lx up to 275–300 lx without changes in the photopic illuminance (250 lx) or chromaticity ([Formula: see text] [Formula: see text] 0.0014). The highest metameric melanopic Michelson contrast for the 6-, 8- and 11-channel luminaire is 0.16, 0.18 and 0.18, which is accomplished at a CCT of 3017 K (Duv: − 0.018), 3456 K (Duv: 0.009) and 3456 K (Duv: 0.009), respectively. By optimising ~ 490,000 multi-channel LED spectra, we identified chromaticity regions in the CIExy colour space that are of particular interest to control the melanopic efficacy with metameric spectral tuning.
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spelling pubmed-86333862021-12-03 Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance Zandi, Babak Stefani, Oliver Herzog, Alexander Schlangen, Luc J. M. Trinh, Quang Vinh Khanh, Tran Quoc Sci Rep Article Smart integrative lighting systems aim to support human health and wellbeing by capitalising on the light-induced effects on circadian rhythms, sleep, and cognitive functions, while optimising the light’s visual aspects like colour fidelity, visual comfort, visual preference, and visibility. Metameric spectral tuning could be an instrument to solve potential conflicts between the visual preferences of users with respect to illuminance and chromaticity and the circadian consequences of the light exposure, as metamers can selectively modulate melanopsin-based photoreception without affecting visual properties such as chromaticity or illuminance. This work uses a 6-, 8- and 11-channel LED luminaire with fixed illuminance of 250 lx to systematically investigate the metameric tuning range in melanopic equivalent daylight illuminance (EDI) and melanopic daylight efficacy ratio (melanopic DER) for 561 chromaticity coordinates as optimisation targets (2700 K to 7443 K ± Duv 0 to 0.048), while applying colour fidelity index R(f) criteria from the TM-30-20 Annex E recommendations (i.e. R(f) [Formula: see text] 85, R(f,h1) [Formula: see text] 85). Our results reveal that the melanopic tuning range increases with rising CCT to a maximum tuning range in melanopic DER of 0.24 (CCT: 6702 K, Duv: 0.003), 0.29 (CCT: 7443 K, Duv: 0) and 0.30 (CCT: 6702, Duv: 0.006), depending on the luminaire’s channel number of 6, 8 or 11, respectively. This allows to vary the melanopic EDI from 212.5–227.5 lx up to 275–300 lx without changes in the photopic illuminance (250 lx) or chromaticity ([Formula: see text] [Formula: see text] 0.0014). The highest metameric melanopic Michelson contrast for the 6-, 8- and 11-channel luminaire is 0.16, 0.18 and 0.18, which is accomplished at a CCT of 3017 K (Duv: − 0.018), 3456 K (Duv: 0.009) and 3456 K (Duv: 0.009), respectively. By optimising ~ 490,000 multi-channel LED spectra, we identified chromaticity regions in the CIExy colour space that are of particular interest to control the melanopic efficacy with metameric spectral tuning. Nature Publishing Group UK 2021-11-30 /pmc/articles/PMC8633386/ /pubmed/34848762 http://dx.doi.org/10.1038/s41598-021-02136-y Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Zandi, Babak
Stefani, Oliver
Herzog, Alexander
Schlangen, Luc J. M.
Trinh, Quang Vinh
Khanh, Tran Quoc
Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
title Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
title_full Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
title_fullStr Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
title_full_unstemmed Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
title_short Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
title_sort optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8633386/
https://www.ncbi.nlm.nih.gov/pubmed/34848762
http://dx.doi.org/10.1038/s41598-021-02136-y
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