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

Abstract 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...

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Autores principales:	Babak Zandi, Oliver Stefani, Alexander Herzog, Luc J. M. Schlangen, Quang Vinh Trinh, Tran Quoc Khanh
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cf519a546abd47e19c4517626fd9a135
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spelling	oai:doaj.org-article:cf519a546abd47e19c4517626fd9a1352021-12-05T12:11:41ZOptimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance10.1038/s41598-021-02136-y2045-2322https://doaj.org/article/cf519a546abd47e19c4517626fd9a1352021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02136-yhttps://doaj.org/toc/2045-2322Abstract 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 Rf criteria from the TM-30-20 Annex E recommendations (i.e. Rf $$\ge$$ ≥ 85, Rf,h1 $$\ge$$ ≥ 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 ( $$\Delta u'v'$$ Δ u ′ v ′ $$\le$$ ≤ 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.Babak ZandiOliver StefaniAlexander HerzogLuc J. M. SchlangenQuang Vinh TrinhTran Quoc KhanhNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Babak Zandi Oliver Stefani Alexander Herzog Luc J. M. Schlangen Quang Vinh Trinh Tran Quoc Khanh Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
description	Abstract 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 Rf criteria from the TM-30-20 Annex E recommendations (i.e. Rf $$\ge$$ ≥ 85, Rf,h1 $$\ge$$ ≥ 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 ( $$\Delta u'v'$$ Δ u ′ v ′ $$\le$$ ≤ 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.
format	article
author	Babak Zandi Oliver Stefani Alexander Herzog Luc J. M. Schlangen Quang Vinh Trinh Tran Quoc Khanh
author_facet	Babak Zandi Oliver Stefani Alexander Herzog Luc J. M. Schlangen Quang Vinh Trinh Tran Quoc Khanh
author_sort	Babak Zandi
title	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_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_sort	optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/cf519a546abd47e19c4517626fd9a135
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Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance

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