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Davidovic, M.; Djokic, L.; Cabarkapa, A.; Kostic, M. |
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Title |
Warm white versus neutral white LED street lighting: Pedestrians' impressions |
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Journal Article |
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Year |
2018 |
Publication |
Lighting Research & Technology |
Abbreviated Journal  |
Lighting Research & Technology |
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Volume |
in press |
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147715351880429 |
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Keywords |
Psychology; Security |
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Abstract |
The subjective impressions of pedestrians are necessary in order to decide on the appropriate colour of light to be used for street lighting. Therefore, a pilot project aimed to compare subjective evaluations of the sidewalk illumination under two street lighting installations, realised by LEDs of 3000 K (warm white) and 4000 K (neutral white), was recently conducted in Belgrade. Both installations had comparable sidewalk illuminances as well as other relevant photometric parameters. The evaluation was done through a questionnaire. A group of 139 (61 male and 78 female) respondents, all of them university students, was asked to grade both lighting installations for the sidewalk light intensity, the appearance of human faces, the colour of light and the colour rendering as well as the overall impression. According to the median values, the 3000 K LED installation was considered better than the 4000 K installation for all aspects assessed as well as the overall impression. Although the survey results convincingly showed a preference for 3000 K LEDs for this comparison, additional research is needed using a more representative sample of people and a wider range of locations before a definite conclusion can be reached. |
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1477-1535 |
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GFZ @ kyba @ |
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2045 |
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Author |
Fotios, S.; Monteiro, A.L.; Uttley, J. |
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Title |
Evaluation of pedestrian reassurance gained by higher illuminances in residential streets using the day–dark approach |
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Journal Article |
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Year |
2018 |
Publication |
Lighting Research & Technology |
Abbreviated Journal |
Lighting Research & Technology |
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in press |
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Keywords |
Vision; Psychology; Security |
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A field study was conducted to investigate how changes in the illuminance affect pedestrian reassurance when walking after dark in an urban location. The field study was conducted in daytime and after dark in order to employ the day–dark approach to analysis of optimal lighting. The results suggest that minimum illuminance is a better predictor of reassurance than is mean illuminance. For a day–dark difference of 0.5 units on a 6-point response scale, the results suggest a minimum horizontal illuminance of approximately 2.0 lux. |
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1477-1535 |
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GFZ @ kyba @ |
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2159 |
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Huang, Z.; Liu, Q.; Westland, S.; Pointer, M.; Luo, M.R.; Xiao, K. |
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Title |
Light dominates colour preference when correlated colour temperature differs |
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Journal Article |
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Year |
2018 |
Publication |
Lighting Research & Technology |
Abbreviated Journal |
Lighting Research & Technology |
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50 |
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7 |
Pages |
995-1012 |
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Keywords |
Vision; Lighting |
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Colour preference for lighting is generally influenced by three kinds of contextual factors, the light, the object and the observer. In this study, a series of psychophysical experiments were conducted to investigate and compare the effect of certain factors on colour preference, including spectral power distribution of light, lighting application, observers’ personal colour preference, regional cultural difference and gender difference. LED lights with different correlated colour temperatures were used to illuminate a wide selection of objects. Participant response was quantified by a 7-point rating method or a 5-level ranking method. It was found that the preferred illumination for different objects exhibited a similar trend and that the influence of light was significantly stronger than that of other factors. Therefore, we conclude that the light itself (rather than, e.g. the objects that are viewed) is the most crucial factor for predicting which light, among several candidates with different correlated colour temperatures, an observer will prefer. In addition, some of the gamut-based colour quality metrics correlated well with the participants’ response, which corroborates the view that colour preference is strongly influenced by colour saturation. The familiarity of the object affects the ratings for each experiment while the colour of the objects also influences colour preference. |
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School of Printing and Packaging, Wuhan University, Luoyu Road 129, Wuhan, China; liuqiang(at)whu.edu.cn |
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SAGE |
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English |
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1477-1535 |
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IDA @ john @ |
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2256 |
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Author |
Bará, S.; Rodríguez-Arós, Á.; Pérez, M.; Tosar, B.; Lima, R.; Sánchez de Miguel, A.; Zamorano, J. |
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Title |
Estimating the relative contribution of streetlights, vehicles, and residential lighting to the urban night sky brightness |
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Journal Article |
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Year |
2018 |
Publication |
Lighting Research & Technology |
Abbreviated Journal |
Lighting Res & Tech |
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October 2018 |
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Keywords |
Remote Sensing; traffic; Roadway lighting |
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Under stable atmospheric conditions the brightness of the urban sky varies throughout the night following the time course of the anthropogenic emissions of light. Different types of artificial light sources (e.g. streetlights, residential, and vehicle lights) have specific time signatures, and this feature makes it possible to estimate the amount of brightness contributed by each of them. Our approach is based on transforming the time representation of the zenithal night sky brightness into a modal expansion in terms of the time signatures of the different sources of light. The modal coefficients, and hence the absolute and relative contributions of each type of source, can be estimated by means of a linear least squares fit. A practical method for determining the time signatures of different contributing sources is also described, based on wide-field time-lapse photometry of the urban nightscape. Our preliminary results suggest that, besides the dominant streetlight contribution, artificial light leaking out of the windows of residential buildings may account for a significant share of the time-varying part of the zenithal night sky brightness at the measurement locations, whilst the contribution of the vehicle lights seems to be significantly smaller. |
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Área de Óptica, Dept. Física Aplicada, Facultade de Óptica e Optometría, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Galicia, Spain. salva.bara(at)usc.es |
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SAGE |
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English |
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English |
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1477-1535 |
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no |
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Call Number |
GFZ @ kyba @ |
Serial |
2052 |
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Author |
Fotios, S. |
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Title |
Using Category Rating to Evaluate the Lit Environment: Is a Meaningful Opinion Captured? |
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Journal Article |
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Year |
2018 |
Publication |
Leukos |
Abbreviated Journal |
Leukos |
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Volume |
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1-16 |
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Keywords |
Psychology |
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Do responses gained using category rating accurately reflect respondents’ true evaluations of an item? “True” in this sense means that they have a real opinion about the issue, rather than being compelled by the survey to speculate an opinion, and that the strength of that opinion is faithfully captured. This article describes some common issues that suggest that it should not be simply assumed that a response gained using category rating reflects a true evaluation. That assumption requires an experiment to have been carefully designed and interpreted, and examples are shown where this is not the case. The article offers recommendations for good practice. |
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1550-2724 |
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GFZ @ kyba @ |
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2270 |
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