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Topic: Light pollution


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In the News (Thu 18 Apr 19)

  
  Light Pollution Information by Starry Night Lights
In a nutshell, Light Pollution is misdirected or misused light...
Light pollution is a problem that affects much of the world’s population.
In a nutshell, light pollution is misdirected or misused light generally resulting from an inappropriate application of outdoor lighting.
www.starrynightlights.com /lpIndex.html   (1222 words)

  
 EEK! - Light Pollution
Light pollution is caused by our ever expanding cities as people build and install lots of outdoor lighting in their communities.
Light fixtures that control light placement and brightness, minimize glare, and save on energy use are the best kind (low pressure sodium lights minimize "sky glow" best and are energy efficient as well for street lighting, parking lots, and security lighting).
Learn all you can about light pollution and/or get involved with an astronomy club or a group that works with their local community to keep skies dark enough for everyone to enjoy.
www.dnr.state.wi.us /org/caer/ce/eek/earth/air/lightpollution.htm   (367 words)

  
 Canberra Astronomical Society - Light Pollution   (Site not responding. Last check: 2007-10-10)
Most domestic lighting is improperly shielded and spreads light in all directions, casts shadows, makes blind spots and puts very little illumination where it is needed.
Lower voltage lights with full cut-off shields are less likely to dazzle you and most importantly they use less power and this saves energy and money.
The fight against light pollution is not designed to put you "in the dark" it is not aimed at disadvantaging anyone.
msowww.anu.edu.au /cas/light_pollution.html   (461 words)

  
 Satellite Photo of Light Pollution
Light pollution on the east coast is made much worse by the condition of the atmosphere, which spreads much more light into the sky than in the western United States, due to atmospheric pollution and haze.
There is some light pollution on the horizon in different directions, particularly in the direction of Atlantic City, which goes up about 45 degrees in that direction.
There is also a lot of light pollution in the northwest from Vineland and Philadelphia that stretches from north to west and goes up about 30-45 degrees.
www.astropix.com /HTML/H_OTHER/SATPOL1.HTM   (1469 words)

  
 Light Pollution   (Site not responding. Last check: 2007-10-10)
This problem has become quite widespread: any light that interferes with astronomical observations is called “light pollution.” Light pollution can be a problem even if you are miles away from the nearest city, this is particularly true if it is large city.
However the problem has not been solved and greater awareness of light pollution is needed (a few organizations are attempting to educate the public on this issue).
The types of lights that interfere with astronomy are not necessary: they waste electricity, cause excess pollution, but can easily be replaced with more efficient lighting that still illuminates the ground without sending as much light into the sky.
www.umich.edu /~lowbrows/light   (270 words)

  
 New England Light Pollution Advisory Group (NELPAG)   (Site not responding. Last check: 2007-10-10)
A majority of outdoor lights are not properly shielded, and thus cause unwanted and unsafe and expensive light trespass and glare.
We tend to light areas at night with fixtures that spread light where it is not needed (outwards and upwards).
Shielding lights with a full-cutoff lens that directs the light properly and uniformly onto the ground can produce huge savings now by utilizing low- and high-pressure-sodium (LPS and HPS) and metal-halide lamps with wattages of 50 or less even for most streetlights (a 50-watt HPS or MH lamp is very bright!).
cfa-www.harvard.edu /~graff/nelpag.html   (2879 words)

  
 Light pollution - Wikipedia, the free encyclopedia
They posit that light pollution is a problem similar to traditional forms of pollution, where established trends in society have long term negative effects.
Energy conservation advocates contend that light pollution must be addressed by changing the habits of society, so that lighting is used more efficiently, with less waste and less creation of unwanted or unneeded illumination.
Since not everyone is irritated by the same lighting sources, the term "Light Pollution" has a measure of subjectivity.
en.wikipedia.org /wiki/Light_pollution   (4587 words)

  
 ASP: Light Pollution
This is true not only in cities but also in suburbs and in rural areas where street lamps and other sources of "light pollution" have obscured our view of constellations, meteor showers, and even the planets.
The light that obscures our view of the night sky comes mainly from inefficient lighting sources that do little to increase nighttime safety, security, or utility.
Unlike other pollution issues, it presents us with a rare case where we should strive to be kept in the dark.
www.astrosociety.org /education/publications/tnl/44/lightpoll.html   (538 words)

  
 EMU Astro Club-Light Pollution   (Site not responding. Last check: 2007-10-10)
The light pollution that results from this misuse is, however, the easiest of pollution sources to fix.
Lighting a brick wall and landscaping simply for architectural vanity is a sin.
The restaurant and surrounding area are saturated with glaring light, a problem easily fixed with a reduction in the number of fixtures and the lights aimed down, not sideways.
www.physics.emich.edu /sherzer/lightpol.htm   (2236 words)

  
 Light Pollution- Astronomers Point of View
We now have light pollution, washing the stars of the sky and jeopardizing the future of astronomy and to some extent, science education.
Light Pollution seems to be a TABU subject in the professional astronomy community.
The state of Arizona is by far the most "vigilant" state with regard to light pollution, mainly due to the presence of a large number of astronomical observatories there.
www.pha.jhu.edu /~atolea/second/page3.html   (1486 words)

  
 Light Pollution
Over the spring and summer of 1999 I drafted a lighting ordinanace with their input, and this was adopted by Williams Bay in September of 1999.
Lights On, Lights Off T-shirt showing North America at night on the front, the Milky Way on the back.
A light pollution project being done at the local Williams Bay High School by Kara Rowbotham and and Jeff Bailey.
astro.uchicago.edu /home/web/rhe/Astronomy/lightpollution.html   (811 words)

  
 Light Pollution- the problem
BAD LIGHTING is a light that leaks light sideways or upward, as most of the commonly used street lights are.
Letting you yard light shine on your neighbor window or yard is rightly qualified as LIGHT TRESPASS in some states or states counties and one could get a fine for an offending light.
The tremendous amount of light that is wasted from poor designed lights has been acknowledged for the first time the moment satellite imagery of the Earth at night has become available.
www.pha.jhu.edu /~atolea/second/page1.html   (1598 words)

  
 The New Jersey Astronomical Association
Whether it be a poorly aimed street light shining in your bedroom window at night, or a neighbor's dusk to dawn backyard light shining into your backyard.
The wasted light therefore equates to an annual waste of at least six million tons of coal (think of the added acid rain and air pollution!) or 23 million barrels of oil (think of the added oil imports).
Lighting on demand may not be as energy conscious as some of the energy efficient high intensity discharge (HID) sources, but it saves energy by not being on when light is not required.
www.njaa.org /light.html   (1376 words)

  
 Light Pollution
Also of local light pollution interest is that Croydon Airport used to have a lighthouse or visual beacon mounted on the tower of the waterworks opposite the aerodrome.
The situation with street lighting is very unclear there seems to be a debate if a street is a premise or not - if it is proved to be a premise one can have the interesting effect of one part of the council investigating another for braking the act.
For instance on the light pollution maps of the UK one of the darkest places in the West of London are the runways at Heathrow Airport.
www.croydonastro.org.uk /lights.htm   (2452 words)

  
 Night Sky Friendly Outdoor Lighting Products by Starry Night Lights » A Beginners Guide To Light Pollution   (Site not responding. Last check: 2007-10-10)
Light pollution can be seen as the glow above our towns and cities, as the glare that makes it hard to see at night and as the light trespass that shines into our bedrooms at night.
Light pollution wastes incredible amounts of our valuable natural resources, consuming hundreds of millions of barrels of oil and hundreds of millions of tons of coal.
Light pollution harms nocturnal wildlife with many species being unable to cope with the loss of a dark night environment.
starrynightlights.com /blog/?p=22   (826 words)

  
 NSCA - Light Pollution
It has many uses including illumination of streets, roads and hazardous areas; for security lighting; to increase the hours of usage for outdoor sports and recreation facilities, to enhance the appearance of buildings at night.
Light in the wrong place at the wrong time can be intrusive.
This leaflet looks at the different aspects of light pollution, explains the steps that can be taken to reduce it and describes what you can do if faced with the problem of pollution from light.
www.nsca.org.uk /pages/environment_facts/light_pollution.cfm   (144 words)

  
 Light Pollution
Light from poorly designed outdoor lighting fixtures is filling our night sky with a sea of pale orange light that covers the dark between the stars, leaving only the brightest points of light visible through the murk.
As an astronomer I am professionally concerned with light pollution, yet I am more afraid of its impact on the general population.
Put the light on a switch and add an infrared sensor that will turn it on when it detects an intruder (or your car pulling up).
www.geocities.com /CapeCanaveral/6389/Light_Pollution.htm   (1025 words)

  
 Prairie Astronomy Club: Light Pollution Fact Sheet
This telescope is severely limited in its research capabilities because of light pollution.
The light is produced when the electric current passes through a container of gas, causing the energized gas to give off characteristic bands of color.
Light from an unshielded fixture that is suppose to be illuminating the ground is also casting light upward.
www.prairieastronomyclub.org /light.htm   (734 words)

  
 SPACE.com -- Spacewatch Friday - Disappearing Stars: How 2,500 Points of Light have Dwindled to 15
Dark-sky advocates say light pollution is the excessive or misdirected outdoor lighting that is threatening to destroy virtually all casual stargazing.
A generation from now, if the current siege of "light blight" goes unchecked, seeing the stars will be reduced to a museum rendition, with the artificial firmament of your local planetarium becoming our childrens only view of the universe.
Light pollution can be controlled and even reduced, by several approaches: installing more efficient, properly shielded lighting fixtures; determining systematic criteria for how much lighting is needed in a given situation; perhaps even imposing late-night "curfews" on outdoor advertising signs.
www.space.com /spacewatch/light_pollution_030321.html   (1004 words)

  
 Is light pollution killing our birds? - Light Pollution dot Org
Light pollution is simply light that is having a bad effect on the environment.
Light pollution is unnecessary and can be controlled with very simple measures that cost very little.
Light pollution is a "green" issue and those organisations concerned about the environment, as well as the astronomical community, should be involved in combating the problem.
www.lightpollution.org.uk   (1693 words)

  
 Light Pollution: The Bane of Astronomer Amateur and Professional
The light pollution in the Springfield MA area is very bad (and Springfield is considered a small city by most people).
To an astronomer, Light Pollution is analogous to having a sewage treatment plant located in the middle of a residential neighborhood.
The state of Wyoming introduced a Light Pollution law to the legislature that was to become law in July of 2000 but it failed to pass the state Senate due to not enough public urging and support.
www.rocketroberts.com /astro/litepol.htm   (11434 words)

  
 [No title]
Disco lights are luring baby turtles to their deaths on the fringes of a Greek marine park in the Mediterranean Sea.
This light is one of the most offensive light pollution devices in the area.
lighting at night is a necessity, but it must be done in a wise manner: light only when necessary; use motion-sensors when possible; use full-cutoff designs to minimize glare, uplighting and trespass; and use appropriately-bright and energy-wise lamps in all cases.
www.utahskies.org /lpIndex.htm   (2539 words)

  
 Light Pollution
Light pollution is stray light emitted from poorly designed and aimed lighting installations for advertising, business, security and street lighting.
While some light is unavoidably reflected upward from illuminated surfaces, much of it spills outside the area that it is meant to illuminate creating glare, light-trespass and skyglow.
We do need outdoor lighting at night but there are better alternatives that save energy and improve the quality of nighttime lighting that also help to reduce skyglow and preserve the night sky.
www.assa.org.au /lightpollution   (196 words)

  
 Science NetLinks: Too Bright at Night?
In particular, they will learn how excessive night lighting in suburbs and in rural areas from street lamps and other sources of "light pollution" have obscured our view of constellations, meteor showers, and even the planets.
Then, ask students if they have heard of light pollution, and what they suppose that it might be.
Light Pollution: An Overview provides additional information about the problems associated with light pollution.
www.sciencenetlinks.com /lessons.cfm?DocID=242   (1098 words)

  
 The night sky in the World
The interest for the protection of the night sky from light pollution is growing every day.
We measure the upward light flux of sources on the Earth surface based on DMSP satellite data and then we compute the effects on the night sky modelling the light propagation in the atmosphere.
and aerosols, the extinction along light paths, the atmospheric aerosol content, the Earth curvature, the altitude of each area, the mountain screening, the observed sky direction, the natural sky brightness, the stellar extinction, the eye capability.
www.lightpollution.it /dmsp   (381 words)

  
 SPACE.com -- Czech Republic Enacts World's First National Light Pollution Law
The group, which has grown to more than 4,000 members in 69 countries across the globe since 1988, works to combat light pollution to preserve and protect the nocturnal environment.
Key to compliance with the new Czech Republic law is the use of fully shielded light fixtures.
The IDA defines these as "fixtures that emit no light above the horizontal direction." Citizens and organizations found in violation of the law's anti-light pollution provisions will be subject to fines ranging from 500 to 150,000 Czech crowns.
www.space.com /spacewatch/skies_czech_020318.html   (494 words)

  
 Light Pollution - darksky.org
Light Pollution - The Bane of Astronomers (Amateur and Professional)
Light Pollution - from the Database for Use in Schools project.
Light Pollution Filters, an exclent review and analysis of LP Filters for CCD work and Lamp Spectrum, by Don S. Goldman of
www.darksky.org /links/lighpoll.html   (542 words)

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