Toward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms

Light that enters humans’ eyes and impacts circadian rhythms may come from various sources, including the sun, electric lighting systems, and self-luminous displays. Occupants’ activities strongly impact the light entering their eyes, which is difficult to predict and not yet well understood. This s...

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Autores principales:	Wenye Hu, Wendy Davis
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	circadian rhythms daylight displays circadian stimulus spectral irradiance human-centric lighting Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/e0b288d28c7b43f599baa4d25dbccd4f
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spelling	oai:doaj.org-article:e0b288d28c7b43f599baa4d25dbccd4f2021-11-11T15:02:07ZToward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms10.3390/app112199392076-3417https://doaj.org/article/e0b288d28c7b43f599baa4d25dbccd4f2021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9939https://doaj.org/toc/2076-3417Light that enters humans’ eyes and impacts circadian rhythms may come from various sources, including the sun, electric lighting systems, and self-luminous displays. Occupants’ activities strongly impact the light entering their eyes, which is difficult to predict and not yet well understood. This study investigated the circadian contributions of light from different sources in real building environments to better understand the variables that influence the circadian health of occupants. Spectral irradiance distributions at a position equivalent to the front of an eye of a seated occupant in various interior office spaces were collected. Daylight and electric light were measured separately, and light emitted from displays was measured when a variety of different computer tasks was performed. Circadian stimulus (<i>CS</i>) and α-opic irradiance, defined by CIE DIS026/E:2018, were further calculated, and the circadian effects of light from different sources were compared. The results show that daylight has the greatest circadian effect, while electric light in spaces that were predominantly designed with conventional downward lighting has a very limited impact. The circadian effect of light from screens was considerably high. The outcomes suggest that, to optimise the circadian effects of light, connected lighting systems are needed to control light from different sources.Wenye HuWendy DavisMDPI AGarticlecircadian rhythmsdaylightdisplayscircadian stimulusspectral irradiancehuman-centric lightingTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9939, p 9939 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	circadian rhythms daylight displays circadian stimulus spectral irradiance human-centric lighting Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	circadian rhythms daylight displays circadian stimulus spectral irradiance human-centric lighting Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Wenye Hu Wendy Davis Toward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms
description	Light that enters humans’ eyes and impacts circadian rhythms may come from various sources, including the sun, electric lighting systems, and self-luminous displays. Occupants’ activities strongly impact the light entering their eyes, which is difficult to predict and not yet well understood. This study investigated the circadian contributions of light from different sources in real building environments to better understand the variables that influence the circadian health of occupants. Spectral irradiance distributions at a position equivalent to the front of an eye of a seated occupant in various interior office spaces were collected. Daylight and electric light were measured separately, and light emitted from displays was measured when a variety of different computer tasks was performed. Circadian stimulus (<i>CS</i>) and α-opic irradiance, defined by CIE DIS026/E:2018, were further calculated, and the circadian effects of light from different sources were compared. The results show that daylight has the greatest circadian effect, while electric light in spaces that were predominantly designed with conventional downward lighting has a very limited impact. The circadian effect of light from screens was considerably high. The outcomes suggest that, to optimise the circadian effects of light, connected lighting systems are needed to control light from different sources.
format	article
author	Wenye Hu Wendy Davis
author_facet	Wenye Hu Wendy Davis
author_sort	Wenye Hu
title	Toward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms
title_short	Toward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms
title_full	Toward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms
title_fullStr	Toward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms
title_full_unstemmed	Toward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms
title_sort	toward a connected system—understanding the contribution of light from different sources on occupants’ circadian rhythms
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e0b288d28c7b43f599baa4d25dbccd4f
work_keys_str_mv	AT wenyehu towardaconnectedsystemunderstandingthecontributionoflightfromdifferentsourcesonoccupantscircadianrhythms AT wendydavis towardaconnectedsystemunderstandingthecontributionoflightfromdifferentsourcesonoccupantscircadianrhythms
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Toward a Connected System—Understanding the Contribution of Light from Different Sources on Occupants’ Circadian Rhythms

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