A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The impact of cyanopic illuminance on evening light induced circadian effects
https://orcid.org/0000-0002-8549-7225
Abstract Circadian lighting aims to avoid the negative impacts of artificial lighting on the circadian system. Of particular concern are the negative effects induced by evening light exposure, such as the suppression of melatonin secretion and delayed circadian phase. The melanopsin-containing intrinsically photosensitive retinal ganglion cells (ipRGCs) play a key role in the circadian phototransduction processes. Therefore, popular metrics for “circadian illuminance”, such as equivalent melanopic lux (EML) and melanopic equivalent daylight D65 illuminance (m-EDI), are based solely on melanopic illuminance. However, some recent studies suggested that visual photo-receptors could also participate in the circadian phototransduction process. Especially, the S-cone-related cyanopic illuminance may also contribute to the light-elicited circadian responses. To investigate the actual role of cyanopic illuminance and the accuracy of the m-EDI and EML metrics, we designed a pair of general-lighting spectra with equivalent melanopic and photopic illuminance but very different cyanopic illuminance (40.5% difference achieved). Human-factor studies were conducted using this pair of spectra, which showed that saliva melatonin concentration and sleep efficiency were significantly higher under the lighting condition with greater cyanopic illuminance. These results suggest that cyanopic illuminance plays an important role in evening-light-induced circadian effects with an inhibitory behavior. On the other hand, cyanopic illuminance alone does not affect KSS-rated subjective alertness. Our findings suggest that incorporating cyanopic illuminance, in addition to melanopic illuminance, can enhance the accuracy of circadian illuminance metrics. This balanced approach can help achieve both precise quantification and convenience in circadian lighting design.
Highlights S-cone-related cyanopic illuminance affects melatonin suppression and sleep quality. Metrics solely based on melanopic illuminance may not be accurate for circadian effect. Higher cyanopic illuminance increases melatonin concentration, improves sleep quality. Cyanopic illuminance alone does not affect KSS-rated subjective alertness. Both melanopic and cyanopic illuminance may be needed for an optimal circadian metric.
The impact of cyanopic illuminance on evening light induced circadian effects
https://orcid.org/0000-0002-8549-7225
Abstract Circadian lighting aims to avoid the negative impacts of artificial lighting on the circadian system. Of particular concern are the negative effects induced by evening light exposure, such as the suppression of melatonin secretion and delayed circadian phase. The melanopsin-containing intrinsically photosensitive retinal ganglion cells (ipRGCs) play a key role in the circadian phototransduction processes. Therefore, popular metrics for “circadian illuminance”, such as equivalent melanopic lux (EML) and melanopic equivalent daylight D65 illuminance (m-EDI), are based solely on melanopic illuminance. However, some recent studies suggested that visual photo-receptors could also participate in the circadian phototransduction process. Especially, the S-cone-related cyanopic illuminance may also contribute to the light-elicited circadian responses. To investigate the actual role of cyanopic illuminance and the accuracy of the m-EDI and EML metrics, we designed a pair of general-lighting spectra with equivalent melanopic and photopic illuminance but very different cyanopic illuminance (40.5% difference achieved). Human-factor studies were conducted using this pair of spectra, which showed that saliva melatonin concentration and sleep efficiency were significantly higher under the lighting condition with greater cyanopic illuminance. These results suggest that cyanopic illuminance plays an important role in evening-light-induced circadian effects with an inhibitory behavior. On the other hand, cyanopic illuminance alone does not affect KSS-rated subjective alertness. Our findings suggest that incorporating cyanopic illuminance, in addition to melanopic illuminance, can enhance the accuracy of circadian illuminance metrics. This balanced approach can help achieve both precise quantification and convenience in circadian lighting design.
Highlights S-cone-related cyanopic illuminance affects melatonin suppression and sleep quality. Metrics solely based on melanopic illuminance may not be accurate for circadian effect. Higher cyanopic illuminance increases melatonin concentration, improves sleep quality. Cyanopic illuminance alone does not affect KSS-rated subjective alertness. Both melanopic and cyanopic illuminance may be needed for an optimal circadian metric.
The impact of cyanopic illuminance on evening light induced circadian effects
https://orcid.org/0000-0002-8549-7225
Abstract Circadian lighting aims to avoid the negative impacts of artificial lighting on the circadian system. Of particular concern are the negative effects induced by evening light exposure, such as the suppression of melatonin secretion and delayed circadian phase. The melanopsin-containing intrinsically photosensitive retinal ganglion cells (ipRGCs) play a key role in the circadian phototransduction processes. Therefore, popular metrics for “circadian illuminance”, such as equivalent melanopic lux (EML) and melanopic equivalent daylight D65 illuminance (m-EDI), are based solely on melanopic illuminance. However, some recent studies suggested that visual photo-receptors could also participate in the circadian phototransduction process. Especially, the S-cone-related cyanopic illuminance may also contribute to the light-elicited circadian responses. To investigate the actual role of cyanopic illuminance and the accuracy of the m-EDI and EML metrics, we designed a pair of general-lighting spectra with equivalent melanopic and photopic illuminance but very different cyanopic illuminance (40.5% difference achieved). Human-factor studies were conducted using this pair of spectra, which showed that saliva melatonin concentration and sleep efficiency were significantly higher under the lighting condition with greater cyanopic illuminance. These results suggest that cyanopic illuminance plays an important role in evening-light-induced circadian effects with an inhibitory behavior. On the other hand, cyanopic illuminance alone does not affect KSS-rated subjective alertness. Our findings suggest that incorporating cyanopic illuminance, in addition to melanopic illuminance, can enhance the accuracy of circadian illuminance metrics. This balanced approach can help achieve both precise quantification and convenience in circadian lighting design.
Highlights S-cone-related cyanopic illuminance affects melatonin suppression and sleep quality. Metrics solely based on melanopic illuminance may not be accurate for circadian effect. Higher cyanopic illuminance increases melatonin concentration, improves sleep quality. Cyanopic illuminance alone does not affect KSS-rated subjective alertness. Both melanopic and cyanopic illuminance may be needed for an optimal circadian metric.
The impact of cyanopic illuminance on evening light induced circadian effects
Huang, Yingying (author) / Hu, Zhiguo (author) / Li, Jiuhui (author) / Dai, Qi (author)
Building and Environment ; 242
2023-06-21
Article (Journal)
Electronic Resource
English
A proposed lighting-design space: circadian effect versus visual illuminance
| British Library Online Contents | 2017
A proposed lighting-design space: circadian effect versus visual illuminance
| British Library Online Contents | 2017
| Wiley | 2016