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LEDs: A Bright New Idea!
As part of Mayor Menino's overall efforts to "green" Boston, the City has been exploring the use of LED lighting for public spaces, sidewalks and roadways through the installation of a demonstration project on Boston Common, with others proposed across the City. By trying out LED lighting in these demonstration projects and soliciting comments, the City will be better able to evaluate the technology as well as its aesthetic impacts. Light Emitting Diodes (LEDs) use far less energy in producing more and better quality light than traditional lighting and last far longer. But it has only been recently that advances in LED technology have made street lighting retrofits viable.
Here are some facts about LED lighting:
- The large number of city street lights (67,000+) has the potential to significantly cut energy use and carbon emissions (currently 24,000 tons/yr) by switching to LED lighting.
- LED fixtures can be "aimed" to minimize light trespass and light pollution.
- LEDs can produce enhanced visibility with better color rending (colors seem more natural).
- There are a growing number of quality LED street light vendors which helps to drive costs down.
- LED street lights are now available from a variety of vendors to address the full range of applications, from decorative post tops to high-speed roadway designs.
- Long life and high reliability. Quality street lights can last 10-25 years depending on usage and can therefore offer significant reduction in maintenance costs compared with traditional lights sources that require replacement every 2-3 years.
- High efficiency with the potential to offer 50 to 80 percent energy savings, the Boston Transportation Department has been converting traffic and pedestrian signals and saves over $400,000 annually.
- Whiter light in a range of color temperatures with a higher color rendering index for enhanced visibility.
- Light from each LED can be guided with secondary optics to provide far more even illumination using lower light levels than traditional lighting sources. Traditional light sources typically over light the area directly under the pole to ensure that the outer areas surrounding the pole are well lit. LED fixtures are designed to spread the light more evenly eliminating the need for over lighting.
Please visit the demonstration project on Boston Common beginning near the Brewer Fountain near Park Street and continuing along the Mayor's Walk to the Public Garden, afterward please take our short survey and tell us what you think!
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