| Records |
| Author |
Yao, Q.; Wang, H.; Dai, Q.; Shi, F. |
| 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  |
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 |
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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. |
| 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 |
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Pages |
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. |
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Transfaculty Research Platform Molecular and Cognitive Neurosciences (MCN), University of Basel, Basel, Switzerland |
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English |
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| ISSN |
0742-3098 |
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PMID:33378563 |
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no |
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GFZ @ kyba @ |
Serial |
3219 |
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Vaaja, M.; Kurkela, M.; Virtanen, J.-P.; Maksimainen, M.; Hyyppä, H.; Hyyppä, J.; Tetri, E. |
| 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 |
11389-11402 |
| Keywords |
Lighting |
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2072-4292 |
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no |
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LoNNe @ kyba @ |
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1258 |
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| Author |
Takemura, Y.; Ito, M.; Shimizu, Y.; Okano, K.; Okano, T. |
| 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 |
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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English |
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2045-2322 |
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PMID:32641723; PMCID:PMC7343865 |
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no |
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GFZ @ kyba @ |
Serial |
3050 |
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| Author |
Long, X.; Tie, X.; Zhou, J.; Dai, W.; Li, X.; Feng, T.; Li, G.; Cao, J.; An, Z. |
| Title |
Impact of the Green Light Program on haze in the North China Plain, China |
Type |
Journal Article |
| Year |
2019 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
Atmos. Chem. Phys. |
| Volume |
19 |
Issue |
17 |
Pages |
11185-11197 |
| Keywords |
Economics; Lighting; Planning |
| Abstract |
As the world's largest developing country, China has undergone ever-increasing demand for electricity during the past few decades. In 1996, China launched the Green Light Program (GLP), which became a national energy conservation activity for saving lighting electricity as well as an effective reduction of the coal consumption for power generation. Despite the great success of the GLP, its effects on haze have not been investigated and well understood. This study focused on assessing the potential coal saving induced by the improvement of luminous efficacy, the core of the GLP, and on estimating the consequent effects on the haze in the North China Plain (NCP), where a large number of power plants are located and are often engulfed by severe haze. The estimated potential coal saving induced by the GLP can reach a massive value of 120–323 million tons, accounting for 6.7 %–18.0 % of the total coal consumption for thermal power generation in China. There was a massive potential emission reduction of air pollutants from thermal power generation in the NCP, which was estimated to be 20.0–53.8 Gg for NOx and 6.9–18.7 Gg for SO2 in December 2015. The potential emission reduction induced by the GLP plays important roles in the haze formation, because the NOx and SO2 are important precursors for the formation of particles. To assess the impact of the GLP on haze, sensitivity studies were conducted by applying a regional chemical–dynamical model (WRF-CHEM). The model results suggest that in the case of lower-limit emission reduction, the PM2.5 concentration decreased by 2–5 µg m−3 in large areas of the NCP. In the case of upper-limit emission reduction, there was much more remarkable decrease in PM2.5 concentration (4–10 µg m−3). This study is a good example to illustrate that scientific innovation can induce important benefits for environment issues such as haze. |
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1680-7324 |
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no |
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GFZ @ kyba @ |
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2671 |
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