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Outages are usually repaired within five working days. If the fault is regarding the electricity supply to the light we inform the local electricity company who usually attend within eight working days of receiving report. In establishing an acceptable level of polluting, some clarification of qualitative values will strengthen future decisions. Consider the research by Gallaway (2014 Gallaway, T. (2014). The value of the night sky. In J. Meier, U. Hasenöhrl, K. Krause, & M. Pottharst (Eds.), Urban lighting, light pollution and society (pp. 267–283). New York, NY: Taylor & Francis. [Google Scholar]), who explores the instrumental value of the night sky for promoting the broadly held values of happiness and sustainability. He concludes by stating, ‘We suggest that estimating the night’s value is not nearly as important as simply recognizing that it does have enormous value and then trying to preserve this value and put it to good use’ (p. 280). Gallaway’s discussion of key night sky traits includes its ability to connect us to the natural world, its ability to engender a sense of wonder, and its beauty. Such an articulation of the value of reducing light pollution falls outside traditional economic calculations, as discussed elsewhere by Gallaway (2010 Gallaway, T. (2010). On light pollution, passive pleasures, and the instrumental value of beauty. Journal of Economic Issues, 44, 71–88.10.2753/JEI0021-3624440104[Taylor & Francis Online], [Web of Science ®] [Google Scholar]). It also further calls into question a needs-based approach. As a frame, light pollution will set the boundaries on what sort of answers are possible, which requires a careful consideration of how ‘needs’ are defined, and what needs ought to be encapsulated by future policies. Light pollution is a side-effect of industrial civilization. Its sources include building exterior and interior lighting, advertising, outdoor area lighting (e.g. car parks/parking lots), offices, factories, streetlights, and illuminated sporting venues. It is most severe in highly industrialized, densely populated areas of North America, Europe, and Japan and in major cities in the Middle East and North Africa like Tehran and Cairo, but even relatively small amounts of light can be noticed and create problems. Awareness of the deleterious effects of light pollution began early in the 20th Century (see e.g. Beston[8]), but efforts to address effects did not begin until the 1950s.[9] In the 1980s a global dark-sky movement emerged with the founding of the International Dark-Sky Association (IDA). There are now such educational and advocacy organizations in many countries worldwide. Astronomy is very sensitive to light pollution. The night sky viewed from a city bears no resemblance to what can be seen from dark skies.[78] Skyglow (the scattering of light in the atmosphere) reduces the contrast between stars and galaxies and the sky itself, making it much harder to see fainter objects. This is one factor that has caused newer telescopes to be built in increasingly remote areas. Some astronomers use narrow-band “nebula filters” which only allow specific wavelengths of light commonly seen in nebulae, or broad-band “light pollution filters” which are designed to reduce (but not eliminate) the effects of light pollution by filtering out spectral lines commonly emitted by sodium- and mercury-vapor lamps, thus enhancing contrast and improving the view of dim objects such as galaxies and nebulae.[79] Unfortunately these light pollution reduction (LPR) filters are not a cure for light pollution. LPR filters reduce the brightness of the object under study and this limits the use of higher magnifications. LPR filters work by blocking light of certain wavelengths, which alters the color of the object, often creating a pronounced green cast. Furthermore, LPR filters only work on certain object types (mainly emission nebulae) and are of little use on galaxies and stars. No filter can match the effectiveness of a dark sky for visual or photographic purposes. Due to their low surface brightness, the visibility of diffuse sky objects such as nebulae and galaxies is affected by light pollution more than are stars. Most such objects are rendered invisible in heavily light polluted skies around major cities. A simple method for estimating the darkness of a location is to look for the Milky Way, which from truly dark skies appears bright enough to cast a shadow.[80] Any scarcity of urban nighttime illumination was quickly diminishing as electrification spread across North American and Europe during the twentieth century, developing alongside urbanization and the growth of transportation networks (Isenstadt, 2014 Isenstadt, S. (2014). Good night. Places Journal. Retrieved 22 October, 2014, from https://placesjournal.org/article/good-night/[Crossref] [Google Scholar]). This proliferation of nighttime illumination has been continuous to the present day, save for two major disruptions: World War Two and the energy crisis of the 1970s. However, nighttime illumination efforts quickly resumed shortly after both of these events (Neumann, 2002b Neumann, D. (2002b). Architectural illumination since World War II. In D. Neumann (Ed.), Architecture of the night: The illuminated building (pp. 78–84). New York, NY: Prestel. [Google Scholar]). Current estimates are that artificial nighttime lighting continues to increase globally by about 3–6% annually (Hölker et al., 2010 Hölker, F., Moss, T., Griefahn, B., Kloas, W., Voigt, C., Henckel, D., … Tockner, K. (2010). The dark side of light: A transdisciplinary research agenda for light pollution policy. Ecology and Society, 15(4), 13.10.5751/ES-03685-150413[Crossref], [Web of Science ®] [Google Scholar]). This has been, in many ways, the ultimate realization of values strived for since the seventeenth century. A lengthening of the day has effectively been achieved, creating unmistakably modern nights where the various facets of nightlife can occur, and where many daytime activities can continue well into the night. But this has come with unintended consequences. In his exploration of ‘the world after dark’, Dewdney (2004 Dewdney, C. (2004). Acquainted with the night: Excursions through the world after dark. Toronto: HarperCollins Publishers Ltd. [Google Scholar], p. 101) cleverly evaluates the two-sided nature of this achievement, stating, Tell us about problems with street lights, pedestrian crossings or illuminated bollards: When it finds a problem in the electronic-control system that it can’t correct, a computer turns on a yellow warning indicator labeled “check engine,” “service engine soon,” or “check powertrain.” Or the light may be nothing more than a picture of an engine, perhaps with the word “check.” Faulkner, D. R. 2013. Astronomical distance determination methods and the light travel time problem. Answers Research Journal 6:211–229. Retrieved from http://www.answersingenesis.org/articles/arj/v6/n1/astronomical-distance-light-travel-problem. Sometimes it is not possible to completely get rid of the problem, as this may prevent the street light from being effective so we may need to find a compromise. If there is a problem with the electricity supply, we will need to inform the electricity supplier and could take more time to fix the light. In the effort to reduce light pollution, researchers have developed a “Unified System of Photometry,” which is a way to measure how much or what kind of street lighting is needed. The Unified System of Photometry allows light fixtures to be designed to reduce energy use while maintaining or improving perceptions of visibility, safety, and security.[101] There was a need to create a new system of light measurement at night because the biological way in which the eye’s rods and cones process light is different in nighttime conditions versus daytime conditions. Using this new system of photometry, results from recent studies have indicated that replacing traditional, yellowish, high-pressure sodium (HPS) lights with “cool” white light sources, such as induction, fluorescent, ceramic metal halide, or LEDs can actually reduce the amount of electric power used for lighting while maintaining or improving visibility in nighttime conditions.[102] Disputes are still common when deciding appropriate action; and differences in opinion over what light is considered reasonable, and who should be responsible, mean that negotiation must sometimes take place between parties. Where objective measurement is desired, light levels can be quantified by field measurement or mathematical modeling, with results typically displayed as an isophote map or light contour map. Authorities have also taken a variety of measures for dealing with light pollution, depending on the interests, beliefs and understandings of the society involved.[citation needed] Measures range from doing nothing at all, to implementing strict laws and regulations about how lights may be installed and used. Peruanisches Maca VigRX Plus el macho BioBelt power up premium Tonus Fortis erogran erogan VigRX Plus erogan

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