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With this definition and sub-categorization, the use of light pollution as a framework for evaluating artificial nighttime lighting begins to come into focus. The undesired outputs of artificial nighttime lighting—be it any of the four broad types listed above—can then be considered in terms of effects. The consequences of light pollution are far reaching, and supporting research is often still at an early stage. However, the effects can likewise be subdivided into five broad categories: energy usage, ecology, health, safety, and the night sky. The past few decades have seen the first large-scale investigations of energy usage by artificial nighttime lighting, as well as its connection to economic costs and greenhouse gas emissions. The International Dark-Sky Association estimates that 22% of all energy in the USA is used for lighting, and of that around 8% is used for outdoor nighttime lighting (IDA, 2014 IDA. (2014). International Dark-Sky Association. International Dark-Sky Association. Retrieved 15 January, 2015, from https://darksky.org/ [Google Scholar]). Another recent study concluded that this number is closer to 6% (Gallaway, Olsen, & Mitchell, 2010 Gallaway, T., Olsen, R., & Mitchell, D. (2010). The economics of global light pollution. Ecological Economics, 69, 658–665.10.1016/j.ecolecon.2009.10.003[Crossref], [Web of Science ®] [Google Scholar]). Such studies often focus not just on the amount of energy used for lighting, but specifically the amount of wasted light. A consistent estimate is that approximately 30% of outdoor lighting in the United States is wasted (Gallaway et al., 2010 Gallaway, T., Olsen, R., & Mitchell, D. (2010). The economics of global light pollution. Ecological Economics, 69, 658–665.10.1016/j.ecolecon.2009.10.003[Crossref], [Web of Science ®] [Google Scholar]; Henderson, 2010 Henderson, D. (2010). Valuing the stars: On the economics of light pollution. Environmental Philosophy, 7, 17–26.10.5840/envirophil2010712[Crossref] [Google Scholar]).77. By wasted, we can assume this percentage of lighting is deemed to fall within one (or more) of the categories listed above (skyglow, glare, light trespass, or clutter).View all notes This translates into roughly 73 million megawatt hours of ‘needlessly generated’ electricty, with an estimated annual cost of US$6.9 billion. Elimating this wasted light, in terms of CO2 reduction, is equivalent to removing 9.5 million cars from the road (Gallaway et al., 2010 Gallaway, T., Olsen, R., & Mitchell, D. (2010). The economics of global light pollution. Ecological Economics, 69, 658–665.10.1016/j.ecolecon.2009.10.003[Crossref], [Web of Science ®] [Google Scholar]). Similar estimates of wasted light in the European Union have predicted that the direct costs amount to €5.2 billion, or 23.5 billion kg of CO2 annually (Morgan-Taylor, 2014 Morgan-Taylor, M. (2014). Regulating light pollution in Europe: Legal challenges and ways forward. In J. Meier, U. Hasenöhrl, K. Krause, & M. Pottharst (Eds.), Urban lighting, light pollution and society (pp. 159–176). New York, NY: Taylor & Francis. [Google Scholar]). Report a street light problem  Some lights are flickering or blinking. This represents a Poor connection somewhere along the circuit. If the blink happens through much of the home, a Main wire connection could be the one having the trouble. If an outdoor lighting pole is broken, please call Xcel Energy Customer Care at 1-800-895-4999. (Except in Minnesota; continue form submission) In light of all this potential, why have organizations been so slow to embrace MOOCs? Here I’ll draw on data from more than 28,000 learners in 127 countries as well as survey and interview results to answer that question and to offer insights into how companies can better capitalize on this form of learning. Use the form below to let us know where the problem is.  Our field personnel typically address light issues within 72 hours of a reported issue. Access to electricity and poverty are closely linked, countries that have the lowest levels of electrification also have the highest levels of poverty. Without adequate electricity and lighting, adults are unable to continue income generating activities into the evening that may lessen the burden of poverty. At the same time, children are unable to study, read or do school work. Rural communities need a reliable and sustainable solution for lighting to give them hope for a brighter future. In 1964/5, Penzias and Wilson discovered that the earth was bathed in a faint microwave radiation, apparently coming from the most distant observable regions of the universe, and this earned them the Nobel Prize for Physics in 1978.1 This Cosmic Microwave Background (CMB) comes from all directions in space and has a characteristic temperature.2,3 While the discovery of the CMB has been called a successful prediction of the big bang model,4 it is actually a problem for the big bang. This is because the precisely uniform temperature of the CMB creates a light-travel–time problem for big bang models of the origin of the universe. We aim to fix streetlights within 28 working days. If it can’t be fixed on the first visit, we may need to order extra parts and the repair will be planned as soon as possible. A common criticism of full cutoff lighting fixtures is that they are sometimes not as aesthetically pleasing to look at. This is most likely because historically there has not been a large market specifically for full cutoff fixtures, and because people typically like to see the source of illumination. Due to the specificity with their direction of light, full cutoff fixtures sometimes also require expertise to install for maximum effect. To report emergency problems with a street light, contact us Monday to Friday 8am to 5pm on 0845 601 0939, or outside these hours phone 0845 795 9639 CarMD published a list of the five most common Check Engine light codes in 2010 and estimated cost of repair. In order of frequency, they are: We’re converting many of our street lights to energy-efficient Light Emitting Diode (LED) technology. Read more about our LED street lighting project. Recessed canister lights are subject to some of the same problems found in ordinary ceiling light fixtures (see above). In addition, sometimes a recessed light fixture may mysteriously go on and of by itself. This is because recessed lights are equipped with limit switches designed to turn a fixture off automatically if the heat reaches an unsafe level. This can be for one of several reasons:  Street light or pole serial number The serial number can be found on a sticker or tag at eye level on the street light standard or pole. The IDA, founded 30 years ago, gathers and disseminates light-pollution information and solutions. It has played a pivotal role in turning the tide in the light-pollution war. The IDA is winning over key sectors of the nonastronomical public — including government groups, sections of the lighting industry and electric utilities — arguing that good lighting for astronomers equals energy savings and more attractive surroundings for everyone else. Requesting new street lights  Requests for new street lighting should be passed to the parish or town council with as much information as possible. Street light replacement project – We’re investing in a £25 million capital project to update and replace thousands of street lights across the town. My instax camera fell about less than 1m height, and now the red light next to the viewing lens is not disappearing. Due to that, i cannot take photos when i press the button. Help? Please use this form to report a lighting issue. 5. Criticisms can be found as early as 1662, when a London pastor stated ‘We ought not to turn day into night, nor night into day … without some very special and urgent occasion’ (Ekirch, 2005 Ekirch, R. A. (2005). At day’s close: Night in times past. New York, NY: W. W. Norton & Company Inc. [Google Scholar], p. 74). This was due to the disruption of the perceived natural (Christian) order that such lighting may cause. However, most criticisms are found in the nineteenth century onward, and specifically around times of transition between technologies. Early objections were often esthetic, however moral objections can also be found (Hasenöhrl, 2014 Hasenöhrl, U. (2014). Lighting conflicts from a historical perspective. In J. Meier, U. Hasenöhrl, K. Krause, & M. Pottharst (Eds.), Urban lighting, light pollution, and society (pp. 105–124). New York, NY: Taylor & Francis. [Google Scholar]). There are documented criticisms of artificial nighttime lighting in astronomy-related literature as early as 1866 (Sperling, 1991 Sperling, N. (1991). The disappearance of darkness. In D. L. Crawford (Ed.), Light pollution, radio interference, and space debris (Vol. 17, pp. 101–108). San Francisco, CA: Astronomical Society of the Pacific Conference Series. [Google Scholar]). Already in the 1880s, Alexander Pelham Tottler—generally regarded as the originator of the scientific study of lighting—identified issues with street lighting that predict modern debates. For example, he argued that too much light is wasted, and that glare causes safety concerns (Bowers, 1998 Bowers, B. (1998). Lengthening the day: A history of lighting technology. Oxford: Oxford University Press. [Google Scholar]). Naturalists and artists expressed ambiguity (at best) towards artificial light as early as the 1920s (Nye, 1990 Nye, D. E. (1990). Electrifying America: Social meanings of a new technology, 1880–1940. Cambridge: MIT Press. [Google Scholar]), and by this time there were already some calls for lighting engineers to reduce urban brightness (Isenstadt, 2014 Isenstadt, S. (2014). Good night. Places Journal. Retrieved 22 October, 2014, from https://placesjournal.org/article/good-night/[Crossref] [Google Scholar]). 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