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Gaslight was followed by the invention of electric lighting in the latter half of the nineteenth century—the most profound technological development in lighting, and arguably one of the most important developments of modern infrastructure. Figuratively, electric lighting became synonymous with—and symbolic of—modern progress. For a Russian poet visiting New York City in the 1920s, the bright electric lights were perceived as modernity’s very medium (Isenstadt, 2014 Isenstadt, S. (2014). Good night. Places Journal. Retrieved 22 October, 2014, from https://placesjournal.org/article/good-night/[Crossref] [Google Scholar]). Aided by various technical advances, for example, floodlights, electric lighting quickly became a ‘sophisticated cultural apparatus’ that could be used for advertising, commemorating history, expressing civic pride, highlighting monuments, etc. (Nye, 1990 Nye, D. E. (1990). Electrifying America: Social meanings of a new technology, 1880–1940. Cambridge: MIT Press. [Google Scholar], p. 73). Via electrification, artificial nighttime lighting became, and remains, a prolific technological artifact capable of esthetic and ideological expression well beyond functional requirements.44. Neumann’s’ Architecture of the Night (2002a Neumann, D. (Ed.). (2002a). Architecture of the night: The illuminated building. New York, NY: Prestel. [Google Scholar]) is arguably the most important recent study of nighttime illumination in architectural history and theory, linking the history of nighttime lighting with the history of modern architecture. Neumann mainly focuses on the esthetic and expressive qualities of ‘illuminated buildings’ throughout the nineteenth and twentieth centuries, providing the first comprehensive catalogue of relevant architectural projects.View all notes Hartnett, J. 2003. A new cosmology: Solution to the starlight travel time problem. TJ 17, no. 2:98–102. In 1957, the U.S. Naval Research Laboratory conducted the first ever radar measurements of the distance from the Earth to the moon. By reflecting light from an Earth-based source off the moon and measuring the back-and-forth time of transit, scientists determined that the moon is approximately 3.84 x108 m from the Earth. Determine the time it takes light to travel from Earth to the moon and back. Check out the FAQ for commonly asked questions about The City street lighting program. The question is then whether there can be a meta-inductive method which is “predictively optimal” in the sense that following that method succeeds best in predictions among all competing methods, no matter what data is received. Gerhard Schurz has highlighted results from the regret-based learning framework of Cesa-Bianchi that there is a meta-inductive strategy that is predictively optimal among all predictive methods that are accessible to an epistemic agent (Cesa-Bianchi & Lugosi 2006; Schurz 2008, forthcoming). This meta-inductive strategy, which Schurz calls “wMI”, predicts a weighted average of the predictions of the accessible methods, where the weights are “attractivities”, which measure the difference between the method’s own success rate and the success rate of wMI. If you’ve noticed an outdoor light within our service area that’s in need of maintenance, please complete and submit the form below. Location of the problem If you don’t know the address, tell us the name of the street and which side the light is on (east, west, north, or south), or the number of lights from the closest cross street (e.g. 2nd pole south of Taylor and Waverley). A full cutoff fixture, when correctly installed, reduces the chance for light to escape above the plane of the horizontal. Light released above the horizontal may sometimes be lighting an intended target, but often serves no purpose. When it enters into the atmosphere, light contributes to sky glow. Some governments and organizations are now considering, or have already implemented, full cutoff fixtures in street lamps and stadium lighting. 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. Medical research on the effects of excessive light on the human body suggests that a variety of adverse health effects may be caused by light pollution or excessive light exposure, and some lighting design textbooks[34] use human health as an explicit criterion for proper interior lighting. Health effects of over-illumination or improper spectral composition of light may include: increased headache incidence, worker fatigue, medically defined stress, decrease in sexual function and increase in anxiety.[35][36][37][38] Likewise, animal models have been studied demonstrating unavoidable light to produce adverse effect on mood and anxiety.[39] For those who need to be awake at night, light at night also has an acute effect on alertness and mood.[40] This paper has critically engaged with the concept of light pollution and identified areas that require further clarification. The limitation of light pollution as a criterion for the moral evaluation of artificial nighttime lighting was discussed, concluding that it can best function in the limited capacity of mitigation or preservation efforts. This led to practical concerns, specifically the ambiguity of thresholds for acceptable levels of light pollution, and the mechanisms that could be used to establish said thresholds. The intention was to highlight conceptual and practical issues that, if addressed, can help to strengthen future regulatory efforts in urban nighttime lighting. Hello. Awhile ago i tried to take photo with my instax. Then the red light were blinking. I tried to change batteries and the red lighy disappeared but i couldnt take photos … public lighting is the single largest source of local government’s greenhouse gas emissions, typically accounting for 30 to 50% of their emissions. There are 1.94 million public lights — one for every 10 Australians — that annually cost A$210 million, use 1,035 GWh of electricity and are responsible for 1.15 million tonnes of CO2 emissions. It is worthwhile to quickly note that, as with most transformational technologies, nighttime lighting has not always been met with open arms. 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], p. 105) notes that while the introduction of new lighting technologies was in general positively received, this did not imply universal endorsement or ‘a universal devaluation of the “dark night” as a whole’. The consequences of artificial nighttime lighting have been under debate since the nineteenth century, and some criticisms of artificial nighttime lighting can be found even earlier.55. 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]).View all notes The most outspoken critics have been astronomers, as reduced stellar visibility has been a long-noticed effect of urban lighting (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]). Still, in the larger narrative of lighting technologies these objections were the exception—nighttime lighting was mostly seen as necessary and desirable for modern urban life (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]). 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