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Fryc, I., & Tabaka, P. (2019). Outdoor Areas Lighting with LEDs – the Competition Between Scotopic Efficacy and Light Pollution. Photon.Lett.PL, 11(3), 75.
Abstract: In this paper the effect of spectral power distribution SPD
of typical outdoor LED lamps on star visibility index SVI was analyzed.
For those lamps the nearest color temperature CCT [K] and scotopic
efficacy lm/W] data are also provided. The SVI has been defined as a
ratio of its scotopic flux to scotopic flux created by full moon light. The
calculations show that there is a strong relation between CCT of LEDs
and SVI index. Low CCT of the lamps does not significantly affect their
SVI value. Unfortunately, those kind of lamps are less attractive in
applications because of their low .
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Jakubowski, P. (2019). Artificial light sources as light pollutant of humans melatonin suppression. Photon.Lett.PL, 11(3), 78.
Abstract: Blue light emitted by LEDs might influence thenatural biological rhythm of a human being, whichcan beconsidered as environment pollution.In this paper the effect of the latest commercially available LEDs on melatonin suppression index (MSI) was analyzed. The research was based on spectral power distributionof a given LED(SPD) and melatonin suppression functionin reference to melatonin suppression under daylight (illuminant D65). The resultsof calculations show astrong correlation between CCT and MSI;however,MSI factor might vary for different LEDs with the same CCT.
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Ściężor, T. (2019). Overnight measurements of the sky brightness as a method for assessing the cloudiness. Photon.Lett.PL, 11(3), 72.
Abstract: Determining the state of cloudiness at night is always a problem, especially at low levels of light pollution. This paper presents an innovative method of assessing the cloudiness of the night sky solely on the basis of all-night measurements of the brightness of the sky using generally available SQM meters. Using the numerical method of calculating the discrete derivative of overnight brightness of the night sky from time it is possible not only to distinguish a cloudless sky from a cloudy one, but even to distinguish high level clouds from medium or low.
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Supronowicz, R., & Fryc, I. (2019). Urban park lighting as a source of botanical light pollution. Photon.Lett.PL, 11(3), 90.
Abstract: That paper describesthe relative impact of anartificial lighting deviceon botanical light pollution, consideringspectral power distribution (SPD in the lighting area. This impact is described by the Relative-to-Moon Photosynthesis Index (RMPI)and Induced Phytochrome Index (IPr). We found that in the case when lighting is realized by using LED luminaires instead of high-pressure sodium (HPS) or metal halide (MH) lamps, the influence of spectral light on plant vegetation process amplifies. Additionally,our research shows that estimating botanical light pollution on the basis of lamps’CCT is not the best method and that using SPD is better for this purpose.
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