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Author |
Bierman, A. |
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Title |
Will switching to LED outdoor lighting increase sky glow? |
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Journal Article |
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Year |
2012 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
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Volume |
44 |
Issue |
4 |
Pages |
449-458 |
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Keywords |
LED; light emitting diode; skyglow; light pollution; modeling; Radiative transfer |
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Abstract |
As LED sources are increasingly being used for outdoor lighting, concerns are being raised about their impact on man-made sky glow. This paper compares the amount of light scattered back to Earth from a 6500 K phosphor-converted white LED light source to that from a 2050 K high pressure sodium (HPS) light source. Calculations based solely on molecular Rayleigh scattering provide an upper limit of 22% more scatter from the LED source, but are not realistic because the atmosphere has significant scatter from aerosol content. Adding in the effects of aerosols in the atmosphere, as derived from aerosol optical depth measurements and Mie scattering distributions, reduces the wavelength dependency of scattered light to where the LED source has roughly 10–20% more scattered light contributing to sky glow. Scattering ratios (LED:HPS) are calculated for different angles and atmospheric conditions. |
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Address |
Lighting Research Center, 21 Union Street, Troy, NY 12180-3352, USA; bierma2(at)rpi.edu |
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Thesis |
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Publisher |
SAGE |
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Language |
English |
Summary Language |
English |
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Edition |
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ISSN |
1477-1535 |
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Notes  |
Luginbuhl, Boley, and Davis (2013) dispute Bierman's thesis. |
Approved |
no |
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Call Number |
IDA @ john @ |
Serial |
269 |
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Author |
Bará, S.; Nievas, M.; Sanchez de Miguel, A.; Zamorano, J. |
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Title |
Zernike analysis of all-sky night brightness maps |
Type |
Journal Article |
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Year |
2014 |
Publication |
Applied Optics |
Abbreviated Journal |
Appl Opt |
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Volume |
53 |
Issue |
12 |
Pages |
2677-2686 |
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Keywords |
modeling; light at night; light pollution; all-sky; Zernike polynomials; image decomposition; sky brightness |
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Abstract |
All-sky night brightness maps (calibrated images of the night sky with hemispherical field-of-view (FOV) taken at standard photometric bands) provide useful data to assess the light pollution levels at any ground site. We show that these maps can be efficiently described and analyzed using Zernike circle polynomials. The relevant image information can be compressed into a low-dimensional coefficients vector, giving an analytical expression for the sky brightness and alleviating the effects of noise. Moreover, the Zernike expansions allow us to quantify in a straightforward way the average and zenithal sky brightness and its variation across the FOV, providing a convenient framework to study the time course of these magnitudes. We apply this framework to analyze the results of a one-year campaign of night sky brightness measurements made at the UCM observatory in Madrid. |
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Address |
Ãrea de Óptica, Dept. de FÃsica Aplicada, Fac. de FÃsica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain |
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Publisher |
Optical Society of America |
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Language |
English |
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ISSN |
0003-6935 |
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Notes |
PMID:24787595 |
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no |
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Call Number |
IDA @ john @ |
Serial |
318 |
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