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Ghosh, A., Kundu, P. K., & Sarkar, G. (2020). Internet Of Human Centric Lighting: A Brief Overview On Indian Aspects. Science And Culture, 86(11-12), 350–356.
Abstract: Human Centric Lighting is popularly known as lighting for health and better living amongst lighting designers and researchers. It has impact on individual health, behavioural and emotional stability at night that suppress melatonin generation rate. This paper presents a new concept called Internet of Human Centric Lighting by which lighting systems can be monitored and administered by smart internet enabled gadgets for stimulating our work efficiency and relaxation at night to reinforce natural circadian rhythm for a better living environment.
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Canazei, M., Staggl, S., Pohl, W., Schüler, S., Betz, D., Ottersbach, J., et al. (2021). Feasibility and acute alerting effects of a daylight-supplementing in-vehicle lighting system – Results from two randomised controlled field studies during dawn and dusk. Lighting Research & Technology, , in press.
Abstract: The present studies examined the feasibility and acute alerting effects of additional in-vehicle lighting within a passenger car. These factors were examined during morning driving (Study 1) and evening driving (Study 2). In a balanced within-subjects design, 37 participants drove a test car two times in the morning or in the evening. The test vehicle was equipped with either a daylight-supplementing interior lighting system or a placebo system, which participants were told would refresh the air. Both studies used identical protocols, and participants participated either in Study 1 (n = 18) or Study 2 (n = 19). In both studies, corneal illuminance levels were recorded while driving. Feasibility of the systems was assessed using subjective ratings. Efficacy outcomes were spindle rates in the alpha bandwidth of electroencephalogram recordings, performance on a psychomotor vigilance task and subjective sleepiness ratings. In both studies, daylight-supplementing significantly increased corneal illuminances while driving and did not cause any negative visual side-effects. Study 1 revealed lower spindle rates while driving under daylight-supplementing lighting, indicating that drivers had higher physiological alertness when exposed to additional light in the morning. This alerting effect of daylight-supplementing lighting, however, was not observed in Study 2. In both studies, performance on the psychomotor vigilance task as well as subjective sleepiness ratings did not significantly differ between the experimental conditions. The present studies provide novel evidence for the feasibility and positive impact of daylight-supplementing in-vehicle lighting systems on the physiological alertness of drivers under naturalistic driving conditions. Further studies are warranted to evaluate carry-over effects of increased alertness on road safety measures.
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Lee, Y., Cho, C., & Lee. H. (2020). Impact of Exposure to Dim Artificial Light at Night during Sleep on Cognitive Function. Chronobiology in Medicine, 2(4), 160–165.
Abstract: Objective
Artificial light at night can impede sleep quality and can cause sleep disturbances. This study aimed to determine if dim artificial light at night (dALAN) affects cognitive function and motor performance.
Methods
A total of 30 healthy young male volunteers aged 21 to 29 years were enrolled in the study. They were randomly divided into two groups depending on light intensity (Group A: 5 lux and Group B: 10 lux). After a quality control process, 23 healthy subjects were included in the study (Group A: 11 subjects, Group B: 12 subjects). Data were gathered from each participant after each night with no light (Night 1) followed by the next night (Night 2) with two different dim light conditions (5 or 10 lux) using a computerized neurocognitive function test (Vienna test).
Results
In the cognitrone test, there was a significant difference in the mean time of correct Yes-response (F=9.08, p=0.007) and the mean time of correct No-response (F=7.12, p=0.014) in both Group A (5 lux) and Group B (10 lux) before and after exposure to dALAN. In the vigilance and motor performance series tests, there were no significant differences before and after exposure to dALAN in both groups, and no differences were observed between the groups.
Conclusion
We found that dALAN exposure did not have a significant effect on cognition, vigilance, or motor performance; rather, the speed was faster in the cognition test after dALAN exposure.
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Kolbe, J. J., Moniz, H. A., Lapiedra, O., & Thawley, C. J. (2021). Bright lights, big city: an experimental assessment of short-term behavioral and performance effects of artificial light at night on Anolis lizards. Urban Ecosystems, , in press.
Abstract: With urbanization expanding into natural areas, it is increasingly important to understand how species subject to human-induced habitat alteration respond to novel opportunities and stressors. A pervasive consequence of urbanization is artificial light at night (ALAN), which previous studies have found introduces both costs and benefits for vertebrates. This understanding, however, primarily reflects findings from laboratory-controlled experiments or comparisons of wild populations in areas with long- standing differences in ALAN regimes. Here, we investigated the short-term costs and benefits for Anolis lizards during the period of initial exposure to ALAN using realistic light levels for urban areas (mean ± SD = 87.9 ± 36.7 lx at a distance of 3 m). As compared to controls, we hypothesized that adding ALAN would result in behavioral and physiological changes over the short term for brown anoles and their arthropod prey. In contrast to predictions, ALAN did not increase arthropod abundance or extend anole activity into the night. Structural habitat and sleep site use changed little in response to ALAN, which exposed about one-third of sleeping anoles in ALAN plots to light at night due to our manipulation. However, this direct light exposure resulted in lizards being more easily roused from sleep compared to lizards sleeping in the dark in control plots or in shadows in ALAN plots. The apparent inability of some anoles to adjust their sleep sites to avoid ALAN exposure may have contributed to their increased responsiveness at night and decreased locomotor endurance in the day. Our study suggests brown anoles can experi- ence higher short-term costs than benefits during initial exposure to ALAN.
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Karpinska, D., & Kunz, M. (2020). Analysis Of Light Pollution Of The Night Sky In Toruń (Poland). CEER, 30(4), 0155–0172.
Abstract: Light pollution is one of the types of environmental pollution. The sky illuminated by the excessive light emission is an inherent element of the modern world. This phenomenon has been known for over a century, but research has been carried out only for several decades. Analysis of the brightness of the sky was made for Toruń (Poland) and neighboring areas. The main aim of the study was to study the distribution of brightness of the sky over a medium-sized city. The basic research method was a direct measurement of brightness made with the SQM photometer. The conducted research was carried out throughout the calendar year on 24 measurement stations located in Toruń. Measurement stations represented various types of buildings occurring in every city. On the basis of the obtained data, a map was made showing the extent of light pollution and its intensity, as well as the spatial distribution of this phenomenon. The brightness of the sky was also examined in terms of astronomical and weather conditions. Each aspect is documented in tabular and visual form.
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