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Author Lin, Y.; Liu, Y.; Sun, Y.; Zhu, X.; Lai, J.; Heynderickx, I. url  doi
openurl 
  Title Model predicting discomfort glare caused by LED road lights Type Journal Article
  Year 2014 Publication Optics Express Abbreviated Journal Opt. Express  
  Volume 22 Issue 15 Pages (down) 18056  
  Keywords LED; LED lighting; glare; road safety; traffic  
  Abstract To model discomfort glare from LED road lighting, the effect of four key variables on perceived glare was explored. These variables were: the average glare source luminance (Lg), the background luminance (Lb), the solid angle of the glare source from the perspective of the viewer; and the angle between the glare source and the line of sight. Based on these four variables 72 different light conditions were simulated in a scaled experimental set-up. Participants were requested to judge the perceived discomfort glare of these light conditions using the deBoer rating scale. All four variables and some of their interactions had indeed a significant effect on the deBoer rating. Based on these findings, we developed a model, and tested its general applicability in various verification experiments, including laboratory conditions as well as real road conditions. This verification proved the validity of the model with a correlation between measured and predicted values as high as 0.87 and a residual deviation of about 1 unit on the deBoer rating scale. These results filled the gap in estimating discomfort glare of LED road lighting and clarified similarities of and differences in discomfort glare between LED and traditional light sources.  
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  ISSN 1094-4087 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number IDA @ john @ Serial 351  
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Author Yao, Q.; Wang, H.; Dai, Q.; Shi, F. url  doi
openurl 
  Title Quantification assessment of light pollution of façade lighting display in Shenzhen, China Type Journal Article
  Year 2020 Publication Optics Express Abbreviated Journal Opt. Express  
  Volume 28 Issue 9 Pages (down) 14100  
  Keywords Lighting; Instrumentation  
  Abstract In this work, we investigated 39 façade lighting displays, all of which consisted of tri-chromatic light sources, namely blue-, green-, and red- light units, in Shenzhen, China. We extracted the spectral characteristics of the mean peak wavelength/full-width at half-maximum,and proposed universal spectral models. We further established the ‘chromaticity-performance’ relation to quantitatively assess the impact of light pollution on typical species based on corresponding action spectra. The findings provide a low-cost, fast and precise approach to assess light pollution of complicated light environment, and may help reduce energy waste and adverse environmental consequences associated with light pollution.  
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  ISSN 1094-4087 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number GFZ @ kyba @ Serial 2893  
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Author Stefani, O.; Freyburger, M.; Veitz, S.; Basishvili, T.; Meyer, M.; Weibel, J.; Kobayashi, K.; Shirakawa, Y.; Cajochen, C. url  doi
openurl 
  Title Changing color and intensity of LED lighting across the day impacts on circadian melatonin rhythms and sleep in healthy men Type Journal Article
  Year 2020 Publication Journal of Pineal Research Abbreviated Journal J Pineal Res  
  Volume in press Issue Pages (down) e12714  
  Keywords Human health; Lighting; cognition; humans; male; melatonin; non-visual effects of light; sleep; wakefulness  
  Abstract We examined whether dynamically changing light across a scheduled 16-h waking day influences sleepiness, cognitive performance, visual comfort, melatonin secretion, and sleep under controlled laboratory conditions in healthy men. Fourteen participants underwent a 49-h laboratory protocol in a repeated-measures study design. They spent the first 5-h in the evening under standard lighting, followed by an 8-h nocturnal sleep episode at habitual bedtimes. Thereafter, volunteers either woke up to static light or to a dynamic light that changed spectrum and intensity across the scheduled 16-h waking day. Following an 8-h nocturnal sleep episode, the volunteers spent another 11-h either under static or dynamic light. Static light attenuated the evening rise in melatonin levels more compared to dynamic light as indexed by a significant reduction in the melatonin AUC prior to bedtime during static light only. Participants felt less vigilant in the evening during dynamic light. After dynamic light, sleep latency was significantly shorter in both the baseline and treatment night while sleep structure, sleep quality, cognitive performance and visual comfort did not significantly differ. The study shows that dynamic changes in spectrum and intensity of light promote melatonin secretion and sleep initiation in healthy men.  
  Address Transfaculty Research Platform Molecular and Cognitive Neurosciences (MCN), University of Basel, Basel, Switzerland  
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  Language English Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN 0742-3098 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:33378563 Approved no  
  Call Number GFZ @ kyba @ Serial 3219  
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Author Vaaja, M.; Kurkela, M.; Virtanen, J.-P.; Maksimainen, M.; Hyyppä, H.; Hyyppä, J.; Tetri, E. url  doi
openurl 
  Title Luminance-Corrected 3D Point Clouds for Road and Street Environments Type Journal Article
  Year 2015 Publication Remote Sensing Abbreviated Journal Remote Sensing  
  Volume 7 Issue 9 Pages (down) 11389-11402  
  Keywords Lighting  
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  Series Volume Series Issue Edition  
  ISSN 2072-4292 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ kyba @ Serial 1258  
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Author Takemura, Y.; Ito, M.; Shimizu, Y.; Okano, K.; Okano, T. url  doi
openurl 
  Title Adaptive light: a lighting control method aligned with dark adaptation of human vision Type Journal Article
  Year 2020 Publication Scientific Reports Abbreviated Journal Sci Rep  
  Volume 10 Issue 1 Pages (down) 11204  
  Keywords Human Health; Vision; Lighting  
  Abstract Light exposure before sleep causes a reduction in the quality and duration of sleep. In order to reduce these detrimental effects of light exposure, it is important to dim the light. However, dimming the light often causes inconvenience and can lower the quality of life (QOL). We therefore aimed to develop a lighting control method for use before going to bed, in which the illuminance of lights can be ramped down with less of a subjective feeling of changes in illuminance. We performed seven experiments in a double-blind, randomized crossover design. In each experiment, we compared two lighting conditions. We examined constant illuminance, linear dimming, and three monophasic and three biphasic exponential dimming, to explore the fast and slow increases in visibility that reflect the dark adaptation of cone and rod photoreceptors in the retina, respectively. Finally, we developed a biphasic exponential dimming method termed Adaptive Light 1.0. Adaptive Light 1.0 significantly prevented the misidentification seen in constant light and effectively suppressed perceptions of the illuminance change. This novel lighting method will help to develop new intelligent lighting instruments that reduce the negative effect of light on sleep and also lower energy consumption.  
  Address The Smart Life Science Institute, ACROSS, Waseda University, Tokyo, Japan. okano@waseda.jp  
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  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2045-2322 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:32641723; PMCID:PMC7343865 Approved no  
  Call Number GFZ @ kyba @ Serial 3050  
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