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Lighting Research & Technology最新文献

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The effect of light directionality on alertness and cognitive performance during post-lunch dip 光线方向性对午餐后昏昏欲睡时的警觉性和认知能力的影响
Lighting Research & Technology Pub Date : 2024-03-28 DOI: 10.1177/14771535241237096
N. Derengowski, M. Knoop, S. Völker
{"title":"The effect of light directionality on alertness and cognitive performance during post-lunch dip","authors":"N. Derengowski, M. Knoop, S. Völker","doi":"10.1177/14771535241237096","DOIUrl":"https://doi.org/10.1177/14771535241237096","url":null,"abstract":"The non-image forming effects of light are moderated by various aspects such as dose, spectrum or temporal and spatial patterns. One of them, the spatial distribution of light within the field of view, has been scarcely researched. Although few studies suggest effects on melatonin secretion during night-time, the daytime effects remain unknown. In this project, we investigated the effect of three light directions – from above, below and the side – each illuminating different retinal regions. The luminance and the size of the light source were kept constant, thus realising the same vertical illuminance and melanopic irradiance at the eye for all scenes. Forty participants underwent a two hour protocol of cognitive tasks and subjective assessments of alertness and performance. Our results suggest stronger non-image forming-effects stimulation with lighting from above, whereas the effect of lighting from below and side differed slightly.","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"142 38","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140369189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Opinion: The need for intensive longitudinal data to advance translational research in the domain of light and health 意见：需要密集的纵向数据来推进光与健康领域的转化研究
Lighting Research & Technology Pub Date : 2024-03-26 DOI: 10.1177/14771535241237002
Karin Smolders
{"title":"Opinion: The need for intensive longitudinal data to advance translational research in the domain of light and health","authors":"Karin Smolders","doi":"10.1177/14771535241237002","DOIUrl":"https://doi.org/10.1177/14771535241237002","url":null,"abstract":"","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140378311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Life cycle assessment of high-power white LEDs for indoor lighting in the context of Hong Kong 香港室内照明用大功率白光发光二极管的生命周期评估
Lighting Research & Technology Pub Date : 2024-03-26 DOI: 10.1177/14771535241234053
MS Ibrahim, Wkc Yung, J. Fan
{"title":"Life cycle assessment of high-power white LEDs for indoor lighting in the context of Hong Kong","authors":"MS Ibrahim, Wkc Yung, J. Fan","doi":"10.1177/14771535241234053","DOIUrl":"https://doi.org/10.1177/14771535241234053","url":null,"abstract":"The introduction of white light-emitting diodes (LEDs) is one of the key innovations that has revolutionized the lighting industry due to its multiple benefits. Despite their advantages, there is a gap in the environmental impact information of the recently developed high-power LED products within the whole lifecycle, which is a key step to achieve sustainable and green development. This life cycle assessment (LCA) is conducted by considering the cradle-to-grave system boundary. The functional units considered are a LED and compact fluorescent lamp (CFL) of 40 million lumen-hours (lm-h) used for indoor applications over an operating time of 20 000 h. In this study, the LCA was carried out using the SimaPro software and built-in ecoinvent database V2.2 with appropriate life cycle inventory data. The analysis results indicate that: (1) the LED-package has a dominant environmental impact followed by the LED driver while the housing and corrugated-board packaging materials showed the least negative effect to the ecosystem during the manufacturing phase. On the contrary, the CFL drivers are dominant followed by the light sources in the case of CFLs. From the lifecycle stages, the usage-phase showed a predominant environmental effect, mainly due to the energy consumption and sources of energy production. (2) A scenario analysis on the sources of electricity production revealed that prospective sources (70% natural gas, 25% nuclear and 5% pumped storage) of energy production lowered the environmental impact compared to the current electricity mix. These proposed electricity generation production sources provide a 61% reduction in the global warming potential in light sources for Hong Kong.","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"107 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140379477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Editorial: Effects of human light exposure on beyond-vision outcomes in different types of built environments 社论：不同类型建筑环境中人类光照对远视效果的影响
Lighting Research & Technology Pub Date : 2024-03-26 DOI: 10.1177/14771535241237003
Myriam Aries
{"title":"Editorial: Effects of human light exposure on beyond-vision outcomes in different types of built environments","authors":"Myriam Aries","doi":"10.1177/14771535241237003","DOIUrl":"https://doi.org/10.1177/14771535241237003","url":null,"abstract":"","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"114 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140380255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel light source for post-harvest lettuce preservation based on chlorophyll absorption spectrum 基于叶绿素吸收光谱的采后生菜保鲜新光源
Lighting Research & Technology Pub Date : 2024-02-18 DOI: 10.1177/14771535241231532
Y-Y Zhu, X. Zhao, Y-D Kang, Y-Z Li, J-H Zhang, G-Y Cao
{"title":"A novel light source for post-harvest lettuce preservation based on chlorophyll absorption spectrum","authors":"Y-Y Zhu, X. Zhao, Y-D Kang, Y-Z Li, J-H Zhang, G-Y Cao","doi":"10.1177/14771535241231532","DOIUrl":"https://doi.org/10.1177/14771535241231532","url":null,"abstract":"With increased consumers’ demand for safe and healthy food, LED lighting for photobiology has received wider attention. In order to prolong the preservation time of the post-harvest lettuce, this paper documents a novel light source designed for preservation based on the chlorophyll absorption spectrum. Effects of intermittent exposure (35 μmol m−2 s−1) on sensory quality and chlorophyll content in fresh lettuce were investigated during 3 days storage at 20°C ± 1°C and 60% ± 1% humidity using dark as the control. The results show that the lighting reduced the colour difference value of lettuce by 23.5% compared with the dark. The content of chlorophyll was 19.7% more than in the dark. The lighting with the novel light source inhibited the decline in the colour difference value − a/ b of lettuce and delayed the degradation of chlorophyll.","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"36 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140452719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
‘The window area shall be at least one-tenth of the area of the room’: The origins of a daylight (and ventilation) requirement in modern building codes 窗户面积至少应为房间面积的十分之一"：现代建筑规范中日照（和通风）要求的起源
Lighting Research & Technology Pub Date : 2024-02-04 DOI: 10.1177/14771535231225363
N. Isaacs
{"title":"‘The window area shall be at least one-tenth of the area of the room’: The origins of a daylight (and ventilation) requirement in modern building codes","authors":"N. Isaacs","doi":"10.1177/14771535231225363","DOIUrl":"https://doi.org/10.1177/14771535231225363","url":null,"abstract":"Current New Zealand (New Zealand Building Code), Australian (National Construction Code) and American (International Building Code) building codes include deemed-to-satisfy requirements for a given proportion of a house’s floor area (e.g. 10%) to be in windows. These, plus the current English Building Regulations, also require a proportion of windows to be openable (e.g. one-half or 5% of the floor area). A detailed summary table supported by code extracts is used to trace the evolution of these requirements. Even the architects of antiquity provided only rules for window proportions but not for window area or size based on room dimensions. The paper demonstrates the evolution of this 21st century requirement follows a direct line to the English 1859 model ‘ Byelaws as to New Streets and Buildings’. Prior to that date, only two rules from 1842 (room volume based) and 1734 (height and volume based) have been found which gave a required window area based on room size. It is hypothesised that one of these led to the current rules. Although the current proportion rules may be appropriate, no empirical research-based origin has been identified.","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"6 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139866509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
‘The window area shall be at least one-tenth of the area of the room’: The origins of a daylight (and ventilation) requirement in modern building codes 窗户面积至少应为房间面积的十分之一"：现代建筑规范中日照（和通风）要求的起源
Lighting Research & Technology Pub Date : 2024-02-04 DOI: 10.1177/14771535231225363
N. Isaacs
{"title":"‘The window area shall be at least one-tenth of the area of the room’: The origins of a daylight (and ventilation) requirement in modern building codes","authors":"N. Isaacs","doi":"10.1177/14771535231225363","DOIUrl":"https://doi.org/10.1177/14771535231225363","url":null,"abstract":"Current New Zealand (New Zealand Building Code), Australian (National Construction Code) and American (International Building Code) building codes include deemed-to-satisfy requirements for a given proportion of a house’s floor area (e.g. 10%) to be in windows. These, plus the current English Building Regulations, also require a proportion of windows to be openable (e.g. one-half or 5% of the floor area). A detailed summary table supported by code extracts is used to trace the evolution of these requirements. Even the architects of antiquity provided only rules for window proportions but not for window area or size based on room dimensions. The paper demonstrates the evolution of this 21st century requirement follows a direct line to the English 1859 model ‘ Byelaws as to New Streets and Buildings’. Prior to that date, only two rules from 1842 (room volume based) and 1734 (height and volume based) have been found which gave a required window area based on room size. It is hypothesised that one of these led to the current rules. Although the current proportion rules may be appropriate, no empirical research-based origin has been identified.","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"156 20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139806673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimising augmented reality projector light output to balance art conservation, colour quality and energy consumption 优化增强现实投影仪的光输出，在艺术保护、色彩质量和能耗之间取得平衡
Lighting Research & Technology Pub Date : 2024-01-25 DOI: 10.1177/14771535231225360
RS Kore, N. Brown, D. Durmus
{"title":"Optimising augmented reality projector light output to balance art conservation, colour quality and energy consumption","authors":"RS Kore, N. Brown, D. Durmus","doi":"10.1177/14771535231225360","DOIUrl":"https://doi.org/10.1177/14771535231225360","url":null,"abstract":"Light absorbed by sensitive artwork may cause irreversible damage. Optimising the spectral power distribution of light sources to minimise absorbed light can reduce damage while maintaining the colour appearance of the artwork. Previous absorption-minimisation studies used optimisation methods without comparing their performance. Here, three-channel LED-augmented reality projector spectra were optimised for 24 colour samples using a brute-force (BF) and multi-objective genetic algorithm (MOGA). The BF search and MOGA performed similarly in achieving optimal results, reducing both light absorption and energy consumption by almost half. However, MOGA was 2.5 times faster than BF in finding optimal solutions. The results indicate that an LED RGB projector can be used to illuminate museum artefacts to reduce light absorption and energy consumption, with the caveat of perceptible colour shifts in some of the colour samples. Future research will investigate observers’ subjective evaluations of artwork under optimised lighting.","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"59 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139598453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of dynamic LED irradiation mode on the content of nitrates, structural and functional characteristics of lettuce plants 动态 LED 照射模式对莴苣植物硝酸盐含量、结构和功能特性的影响
Lighting Research & Technology Pub Date : 2024-01-12 DOI: 10.1177/14771535231223871
S. Turanov, A. Burenina, E. Surnina, A. Butenkova, T. Astafurova, T. Han
{"title":"Influence of dynamic LED irradiation mode on the content of nitrates, structural and functional characteristics of lettuce plants","authors":"S. Turanov, A. Burenina, E. Surnina, A. Butenkova, T. Astafurova, T. Han","doi":"10.1177/14771535231223871","DOIUrl":"https://doi.org/10.1177/14771535231223871","url":null,"abstract":"One of the promising irradiation modes for plant is dynamic, when parameters change throughout the growing process depending on certain factors. In this work, lettuce plants were illuminated under different LED light sources, including white (2700 K), 30% white (2700 K) + 70% red (660 nm), 15% blue (445 nm) + 85% red (660 nm), 40% blue (445 nm) + 20% red (630 nm) + 40% red (660 nm) and dynamic mode for 35 days to investigate the effects. Photosynthetically active flux density was the same for all lettuce samples during the experiment (210 µmol m−2 s−1). The results showed the effects of photoregulation on the growth and development of lettuce plants. Optimal irradiation regime for lettuce plants was a dynamic regime formed using two colour components: white (2700 K) and red (660 nm) LEDs. Lettuce grown under dynamic conditions had a lower content of nitrates and developed faster than under stationary conditions.","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"5 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139532512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Opinion: Evidence for design guidance 意见：设计指南的证据
Lighting Research & Technology Pub Date : 2023-12-28 DOI: 10.1177/14771535231217385
Steve Fotios
{"title":"Opinion: Evidence for design guidance","authors":"Steve Fotios","doi":"10.1177/14771535231217385","DOIUrl":"https://doi.org/10.1177/14771535231217385","url":null,"abstract":"","PeriodicalId":269493,"journal":{"name":"Lighting Research & Technology","volume":"220 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139152906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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