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Author Fiorentin, P.; Boscaro, F.
Title A method for measuring the light output of video advertising reproduced by LED billboards Type Journal Article
Year 2019 Publication Measurement Abbreviated Journal Measurement
Volume 138 Issue Pages 25-33
Keywords Lighting; Energy; Instrumentation; Planning; Light-emitting diode displays; Photometry; Video recording; Image analysis; CCD image sensors; Luminance; Glare
Abstract Improving knowledge of the light output of digital billboards is important to better assess their effect on driver distraction when they are installed along roads. In this work the emission of an LED based billboard is measured when playing advertising video-clips. In particular the average and the maximum values of the luminance are evaluated. The same video-clips are also analyzed when shown on an LCD monitor, aiming at separating the variability of the videos and of the playing device. The results allow to evaluate an utilization factor of the billboard: the videos have an average luminance around 11% and a peak luminance of 35% of the maximum luminance obtainable from the billboard. The power consumption of the billboard is measured, aside the photometric analysis. The luminance of the device are found linearly dependent on both the power and the effective current absorbed by the device from the grid, with a discrepancy within 6%. It could be a useful information for billboard manufacturers to qualify their product when they do not own photometric instruments.
Address Department of Industrial Engineering, University of Padova, Padova, Italy; pietro.fiorentin(at)unipd.it
Corporate Author Thesis
Publisher Elsevier Place of Publication Editor
Language (down) English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0263-2241 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2214
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Author Lewis, A.L.
Title Visual Performance as a Function of Spectral Power Distribution of Light Sources at Luminances Used for General Outdoor Lighting Type Journal Article
Year 1999 Publication Journal of the Illuminating Engineering Society Abbreviated Journal Journal of the Illuminating Engineering Society
Volume 28 Issue 1 Pages 37-42
Keywords Vision; spectral power distribution; SPD; lighting
Abstract (none)
Address Michigan College of Optometry, Ferris State University, Big Rapids, Michigan
Corporate Author Thesis
Publisher Taylor & Francis Place of Publication Editor
Language (down) English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0099-4480 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 2223
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Author Stone, T.
Title The Value of Darkness: A Moral Framework for Urban Nighttime Lighting Type Journal Article
Year 2018 Publication Science and Engineering Ethics Abbreviated Journal Sci Eng Ethics
Volume 24 Issue 2 Pages 607-628
Keywords Darkness; Society
Abstract The adverse effects of artificial nighttime lighting, known as light pollution, are emerging as an important environmental issue. To address these effects, current scientific research focuses mainly on identifying what is bad or undesirable about certain types and uses of lighting at night. This paper adopts a value-sensitive approach, focusing instead on what is good about darkness at night. In doing so, it offers a first comprehensive analysis of the environmental value of darkness at night from within applied ethics. A design for values orientation is utilized to conceptualize, define, and categorize the ways in which value is derived from darkness. Nine values are identified and categorized via their type of good, temporal outlook, and spatial characteristics. Furthermore, these nine values are translated into prima facie moral obligations that should be incorporated into future design choices, policy-making, and innovations to nighttime lighting. Thus, the value of darkness is analyzed with the practical goal of informing future decision-making about urban nighttime lighting.
Address Ethics and Philosophy of Technology Section, Delft University of Technology, Jaffalaan 5, 2628 BX, Delft, The Netherlands. t.w.stone@tudelft.nl
Corporate Author Thesis
Publisher Place of Publication Editor
Language (down) English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1353-3452 ISBN Medium
Area Expedition Conference
Notes PMID:28597220; PMCID:PMC5876417 Approved no
Call Number GFZ @ kyba @ Serial 2225
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Author Ciocca, M.; Wang, J.
Title By the light of the silvery Moon: fact and fiction Type Journal Article
Year 2013 Publication Physics Education Abbreviated Journal Phys. Educ.
Volume 48 Issue 3 Pages 360-367
Keywords Vision; moonlight; Purkinje effect; Purkinje shift; mesopic
Abstract Is moonlight 'silver' or 'cold'? In this paper we discuss the interesting combination of factors that contribute to the common descriptions of moonlight. Sunlight is reflected from the lunar surface and red-shifted. When traversing the atmosphere, moonlight is further depleted of short wavelength content by Rayleigh scattering. We measured the spectra of the moonlight to show these effects and compared them with sunlight. All measurements, including spectral reflectance, suggest that moonlight is redder than sunlight. The silvery Moon is just an illusion due to the properties and behaviour of our own eyes, including the responses of rods and cones and the physiological perceptive phenomenon called Purkinje shift.
Address Eastern Kentucky University, Richmond, KY, USA E-mail: marco.ciocca(at)eku.edu
Corporate Author Thesis
Publisher IOP Place of Publication Editor
Language (down) English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0031-9120 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 2227
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Author Duarte, C.; Quintanilla-Ahumada, D.; Anguita, C.; Manríquez, P.H.; Widdicombe, S.; Pulgar, J.; Silva-Rodriguez, E.A.; Miranda, C.; Manríquez, K.; Quijón, P.A.
Title Artificial light pollution at night (ALAN) disrupts the distribution and circadian rhythm of a sandy beach isopod Type Journal Article
Year 2019 Publication Environmental Pollution Abbreviated Journal Environmental Pollution
Volume 248 Issue Pages 565-573
Keywords Animals; isopod; Tylos spinulosus; Chile; beaches; mesocosms
Abstract Coastal habitats, in particular sandy beaches, are becoming increasingly exposed to artificial light pollution at night (ALAN). Yet, only a few studies have this far assessed the effects of ALAN on the species inhabiting these ecosystems. In this study we assessed the effects of ALAN on Tylos spinulosus, a prominent wrack-consumer isopod living in sandy beaches of north-central Chile. This species burrows in the sand during daylight and emerges at night to migrate down-shore, so we argue it can be used as a model species for the study of ALAN effects on coastal nocturnal species. We assessed whether ALAN alters the distribution and locomotor activity of this isopod using a light system placed in upper shore sediments close to the edge of the dunes, mimicking light intensities measured near public lighting. The response of the isopods was compared to control transects located farther away and not exposed to artificial light. In parallel, we measured the isopods’ locomotor activity in the laboratory using actographs that recorded their movement within mesocosms simulating the beach surface. Measurements in the field indicated a clear reduction in isopod abundance near the source of the light and a restriction of their tidal distribution range, as compared to control transects. Meanwhile, the laboratory experiments showed that in mesocosms exposed to ALAN, isopods exhibited reduced activity and a circadian rhythm that was altered and even lost after a few days. Such changes with respect to control mesocosms with a natural day/night cycle suggest that the changes observed in the field were directly related to a disruption in the locomotor activity of the isopods. All together these results provide causal evidence of negative ALAN effects on this species, and call for further research on other nocturnal sandy beach species that might become increasingly affected by ALAN.
Address Departamento de Ecología y Biodiversidad, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile;
Corporate Author Thesis
Publisher Elsevier Place of Publication Editor
Language (down) English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0269-7491 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2228
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