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Author (up) Kuhn, L.; Johansson, M.; Laike, T.; Goven, T.
Title Residents' perceptions following retrofitting of residential area outdoor lighting with LEDs Type Journal Article
Year 2013 Publication Lighting Research and Technology Abbreviated Journal Lighting Research and Technology
Volume 45 Issue 5 Pages 568-584
Keywords *Lighting; outdoor lighting; LED; light emitting diode; lighting levels; public opinion
Abstract The use of light emitting diodes (LEDs) in outdoor lighting has energy-saving potential, but users’ responses to this light source are largely unknown. An intervention study in two residential areas compared conventional lighting installations (high pressure sodium in Area 1 and high pressure mercury in Area 2) to a retrofitted LED-alternative regarding residents’ perceptions of quality of light, visual accessibility and danger. Moreover, energy use was calculated. Residents’ (N = 60) visual accessibility improved and perceived danger remained low in both areas after retrofitting. In Area 2 the perceived quality of light increased, whereas in Area 1 the results were mixed. The retrofitted application reduced energy use by 41–76% and might be a feasible alternative to conventional outdoor lighting in relatively safe areas.
Address Environmental Psychology, Department of Architecture and Built Environment, Lund University, Lund, Sweden
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ISSN 1477-1535 ISBN Medium
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Notes Approved no
Call Number IDA @ john @ Serial 280
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Author (up) Kyba, C.C.M.; Hölker, F.
Title Do artificially illuminated skies affect biodiversity in nocturnal landscapes? Type Journal Article
Year 2013 Publication Landscape Ecology Abbreviated Journal Landscape Ecol
Volume 28 Issue 9 Pages 1637-1640
Keywords skyglow; light pollution; biodiversity
Abstract The skyglow from cities at night is one of the most dramatic modifications that humans have made to Earth’s biosphere, and it is increasingly extending into nocturnal landscapes (nightscapes) far beyond urban areas. This scattered light is dim and homogenous compared to a lit street, but can be bright compared to natural celestial light sources, such as stars. Because of the large area of Earth affected by artificial skyglow, it is essential to verify whether skyglow is a selective pressure in nocturnal landscapes. We propose two scientific approaches that could examine whether skyglow affects biodiversity.
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ISSN 0921-2973 ISBN Medium
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Notes Approved no
Call Number IDA @ john @ Serial 35
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Author (up) Kyba, C.C.M.; Ruhtz, T.; Lindemann, C.; Fischer, J.; Hölker, F.
Title Two camera system for measurement of urban uplight angular distribution Type Journal Article
Year 2013 Publication AIP Conf. Proc Abbreviated Journal
Volume 1531 Issue 568 Pages
Keywords Instrumentiation
Abstract The angular distribution function of light emitted from cities is unknown, and represents the most important systematic error in skyglow simulations. We describe a method for measuring this distribution using a two camera system mounted on an aerial platform. We present preliminary results from a test flight using such a system, taken over the city of Berlin on July 14, 2011.
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Call Number LoNNe @ christopher.kyba @ Serial 467
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Author (up) Kyba, C.C.M.; Wagner, J.M.; Kuechly, H.U.; Walker, C.E.; Elvidge, C.D.; Falchi, F.; Ruhtz, T.; Fischer, J.; Hölker, F.
Title Citizen science provides valuable data for monitoring global night sky luminance Type Journal Article
Year 2013 Publication Scientific Reports Abbreviated Journal Sci Rep
Volume 3 Issue Pages 1835
Keywords
Abstract The skyglow produced by artificial lights at night is one of the most dramatic anthropogenic modifications of Earth's biosphere. The GLOBE at Night citizen science project allows individual observers to quantify skyglow using star maps showing different levels of light pollution. We show that aggregated GLOBE at Night data depend strongly on artificial skyglow, and could be used to track lighting changes worldwide. Naked eye time series can be expected to be very stable, due to the slow pace of human eye evolution. The standard deviation of an individual GLOBE at Night observation is found to be 1.2 stellar magnitudes. Zenith skyglow estimates from the “First World Atlas of Artificial Night Sky Brightness” are tested using a subset of the GLOBE at Night data. Although we find the World Atlas overestimates sky brightness in the very center of large cities, its predictions for Milky Way visibility are accurate.
Address Institute for Space Sciences, Freie Universitat Berlin, Berlin, Germany. christopher.kyba@wew.fu-berlin.de
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Language English Summary Language Original Title
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ISSN 2045-2322 ISBN Medium
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Notes PMID:23677222; PMCID:PMC3655480 Approved no
Call Number IDA @ john @ Serial 13
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Author (up) Le Tallec, T.; Perret, M.; Théry, M.
Title Light Pollution Modifies the Expression of Daily Rhythms and Behavior Patterns in a Nocturnal Primate Type Journal Article
Year 2013 Publication PLoS ONE Abbreviated Journal
Volume 8 Issue 11 Pages e79250
Keywords Animals
Abstract Among anthropogenic pressures, light pollution altering light/dark cycles and changing the nocturnal component of the environment constitutes a threat for biodiversity. Light pollution is widely spread across the world and continuously growing. However, despite the efforts realized to describe and understand the effects of artificial lighting on fauna, few studies have documented its consequences on biological rhythms, behavioral and physiological functions in nocturnal mammals. To determine the impacts of light pollution on nocturnal mammals an experimental study was conducted on a nocturnal primate, the grey mouse lemur Microcebus murinus. Male mouse lemurs (N = 8) were exposed 14 nights to moonlight treatment and then exposed 14 nights to light pollution treatment. For both treatments, chronobiological parameters related to locomotor activity and core temperature were recorded using telemetric transmitters. In addition, at the end of each treatment, the 14th night, nocturnal and feeding behaviors were explored using an infrared camera. Finally, throughout the study, body mass and daily caloric food intake were recorded. For the first time in a nocturnal primate, light pollution was demonstrated to modify daily rhythms of locomotor activity and core temperature especially through phase delays and increases in core temperature. Moreover, nocturnal activity and feeding behaviors patterns were modified negatively. This study suggests that light pollution induces daily desynchronization of biological rhythms and could lead to seasonal desynchronization with potential deleterious consequences for animals in terms of adaptation and anticipation of environmental changes.
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Call Number LoNNe @ christopher.kyba @ Serial 380
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