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Author Luginbuhl, C.B.; Boley, P.A.; Davis, D.R.
Title The impact of light source spectral power distribution on sky glow Type Journal Article
Year 2014 Publication Journal of Quantitative Spectroscopy and Radiative Transfer Abbreviated Journal Journal of Quantitative Spectroscopy and Radiative Transfer
Volume (down) 139 Issue Pages 21-26
Keywords Light pollution; Sky glow; Blue-rich light sources; LED; light emitting diode; lighting
Abstract The effect of light source spectral power distribution on the visual brightness of anthropogenic sky glow is described. Under visual adaptation levels relevant to observing the night sky, namely with dark-adapted (scotopic) vision, blue-rich (“white”) sources produce a dramatically greater sky brightness than yellow-rich sources. High correlated color temperature LEDs and metal halide sources produce a visual brightness up to 8× brighter than low-pressure sodium and 3× brighter than high-pressure sodium when matched lumen-for-lumen and observed nearby. Though the sky brightness arising from blue-rich sources decreases more strongly with distance, the visual sky glow resulting from such sources remains significantly brighter than from yellow sources out to the limits of this study at 300 km.
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Series Volume Series Issue Edition
ISSN 0022-4073 ISBN Medium
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Notes Approved no
Call Number IDA @ john @ Serial 178
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Author Shang, Y.-M.; Wang, G.-S.; Sliney, D.; Yang, C.-H.; Lee, L.-L.
Title White light-emitting diodes (LEDs) at domestic lighting levels and retinal injury in a rat model Type Journal Article
Year 2014 Publication Environmental Health Perspectives Abbreviated Journal Environ Health Perspect
Volume (down) 122 Issue 3 Pages 269-276
Keywords LED; light emitting diode; lighting; retina; Eye Diseases; blue light; Blue-rich light sources
Abstract BACKGROUND: Light-emitting diodes (LEDs) deliver higher levels of blue light to the retina than do conventional domestic light sources. Chronic exposure to high-intensity light (2,000-10,000 lux) has previously been found to result in light-induced retinal injury, but chronic exposure to relatively low-intensity (750 lux) light has not been previously assessed with LEDs in a rodent model. OBJECTIVE: We examined LED-induced retinal neuronal cell damage in the Sprague-Dawley rat using functional, histological, and biochemical measurements. METHODS: We used blue LEDs (460 nm) and full-spectrum white LEDs, coupled with matching compact fluorescent lights, for exposures. Pathological examinations included electroretinogram, hematoxylin and eosin (H&E) staining, immunohistochemistry (IHC), and transmission electron microscopy (TEM). We also measured free radical production in the retina to determine the oxidative stress level. RESULTS: H&E staining and TEM revealed apoptosis and necrosis of photoreceptors, which indicated blue-light induced photochemical injury of the retina. Free radical production in the retina was increased in LED-exposed groups. IHC staining demonstrated that oxidative stress was associated with retinal injury. Although we found serious retinal light injury in LED groups, the compact fluorescent lamp (CFL) groups showed moderate to mild injury. CONCLUSION: Our results raise questions about adverse effects on the retina from chronic exposure to LED light compared with other light sources that have less blue light. Thus, we suggest a precautionary approach with regard to the use of blue-rich “white” LEDs for general lighting. CITATION: Shang YM, Wang GS, Sliney D, Yang CH, Lee LL. 2014. White light-emitting diodes (LEDs) at domestic lighting levels and retinal injury in a rat model. Environ Health Perspect 122:269-276; http://dx.doi.org/10.1289/ehp.1307294.
Address Institute of Environmental Health, National Taiwan University, Taipei, Taiwan
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Language English Summary Language Original Title
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Series Volume Series Issue Edition
ISSN 0091-6765 ISBN Medium
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Notes PMID:24362357; PMCID:PMC3948037 Approved no
Call Number IDA @ john @ Serial 324
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Author Hamacher, D.W.; De Napoli, K.; Mott, B.
Title Whitening the Sky: light pollution as a form of cultural genocide Type Journal Article
Year 2020 Publication Journal of Dark Sky Studies Abbreviated Journal J of Dark Sky Studies
Volume (down) 1 Issue in press Pages
Keywords Society; Blue-rich light sources; indigenous knowledge; aboriginal australia; torres strait islanders; decolonizing methodologies
Abstract Light pollution is actively destroying our ability to see the stars and disconnecting people from their deep-time connection to the sky, acting as a form of ongoing cultural and ecological genocide for Indigenous people around the world. Many traditional knowledge systems are based on the stars and peoples' ablity to observe and interpret them for a range of practical, social, and scientific purposes is critical. Efforts to reduce, minimise, or eliminate light pollution are being achieved with varying degrees of success, but the increased use of blue-light emitting LEDs as a cost-effective solution is worsening problems related to human health, wildlife, and astronomical heritage for the benefit of capitalistic economic growth. We provide a brief overview illustrating some of the important connections that Aboriginal and Torres Strait Islander people maintain with the stars, as well as the worsening damage growing light pollution is causing to this ancient knowledge. We propose a transdisciplinary approach to solving the issues of growing light pollution, using a foundation based on Indigenous philosophies and decolonising methodologies.
Address ARC Centre of Excellence for All-Sky Astrophysics in Three Dimensions (ASTRO-3D), School of Physics, University of Melbourne, Parkville, VIC 30130, Australia; duane.hamacher@unimelb.edu.au
Corporate Author Thesis
Publisher University of Utah Place of Publication USA Editor
Language English Summary Language English Original Title
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ISSN ISBN Medium
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Notes Approved no
Call Number IDA @ john @ Serial 2780
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Author Witkowski, P., & Korzeniewska, E.
Title Comparative analysis of HPS and LED luminaries in terms of effectiveness of greenhouse plant lighting and light emission Type Journal Article
Year 2019 Publication IEEE Xplore Abbreviated Journal
Volume (down) Issue Pages
Keywords Lighting; Light emitting diodes; LED; Lighting; Sodium; Electromagnetics; Light sources; Color; Production
Abstract The article focuses on the analysis of the parameters of light sources, spectrum characteristics of HPS and LED lighting to achieve the best results in greenhouse cultivation with the least energy consumption, and the escape of light into space. The authors have compared both sodium HPS and LED luminaries in the aspect of colour light efficiency and their influence on the plant vegetation process.
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Notes Approved no
Call Number IDA @ intern @ Serial 2646
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