Street lights account for only 20% of light pollution?
- clayton
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Street lights account for only 20% of light pollution?
Clayton Lindsey
- clayton
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- Real Name: Clayton Lindsey
- Location: Woodbury, MN
Re: Street lights account for only 20% of light pollution?
Different Year (2012), Different City ( Berlin) slightly higher 31.6%. Methodology is not quite the same.
Also Tucson, Arizona in the above study has adjustable smart street lights. Would that be cool if all streets lights city wide could be turned down? Even 5 days a month around new moon and only on clear nights would be cool.
White Bear supposedly has these lights in some areas: https://www.businesswire.com/news/home/ ... oor-Lights https://www.echelon.com/assets/blt339a5 ... Report.pdf
https://doi.pangaea.de/10.1594/PANGAEA.785492..lighting associated with streets has been found to be the dominant source of zenith directed light pollution (31.6%), although other land use classes have much higher average brightness. These results are compared with other urban light pollution quantification studies.
Also Tucson, Arizona in the above study has adjustable smart street lights. Would that be cool if all streets lights city wide could be turned down? Even 5 days a month around new moon and only on clear nights would be cool.
White Bear supposedly has these lights in some areas: https://www.businesswire.com/news/home/ ... oor-Lights https://www.echelon.com/assets/blt339a5 ... Report.pdf
Clayton Lindsey
- setnes
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Re: Street lights account for only 20% of light pollution?
Tuscon already has a much better outdoor lighting code than other cities. It would be interesting to know how much that skews the results on such a test.
For example, they outright prohibit bottom mounted sign lighting, searchlights, and Mercury vapor lamps. I assume the Mercury vapor part was to force the use of the warmer color temperature sodium lights before LED. They also have different lighting codes in some areas to try to protect dark sky.
And... rated color temperatures cannot exceed 3500K!
https://www.tucsonaz.gov/files/pdsd/cod ... _code_.pdf
Imagine if cities and business had to follow similar rules here.
For example, they outright prohibit bottom mounted sign lighting, searchlights, and Mercury vapor lamps. I assume the Mercury vapor part was to force the use of the warmer color temperature sodium lights before LED. They also have different lighting codes in some areas to try to protect dark sky.
And... rated color temperatures cannot exceed 3500K!
https://www.tucsonaz.gov/files/pdsd/cod ... _code_.pdf
Imagine if cities and business had to follow similar rules here.
- clayton
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Re: Street lights account for only 20% of light pollution?
Yeah Tuscon is probably an outlier. I wish Commercial Lighting would be more strongly controlled. I doubt we will ever impact the security and safety segment, however these smart systems may help.
https://statetechmagazine.com/article/2 ... es-perfcon
https://statetechmagazine.com/article/2 ... es-perfcon
Clayton Lindsey
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Re: Street lights account for only 20% of light pollution?
Never knew that. Too bad it is only in Railroad Park, a small park in downtown WBL. Lights in the rest of the town seem as out of control as anywhere else.clayton wrote: ↑Tue Nov 10, 2020 6:33 pm White Bear supposedly has these lights in some areas: https://www.businesswire.com/news/home/ ... oor-Lights https://www.echelon.com/assets/blt339a5 ... Report.pdf
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MAS Membership Coordinator
12.5" f/4.7 Obsession Clone Homemade Truss Dob, sometimes equipped with Celestron StarSense Explorer app
Celestron C8 SCT OTA on AVX GEQ mount
Astro-Tech AT72 ED Refractor OTA usually on Explore Scientific Twilight 1 mount or tripod with Benro geared head
Celestron 5" SCT OTA on Explore Scientific Twilight 1 Alt-Az Mount, usually equipped with StarSense Explorer app
Orion 150mm Mak OTA and Orion EQ-G computerized mount
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Re: Street lights account for only 20% of light pollution?
Not sure if this has any bearing on the street lighting code in Tucson, but Tucson is also home to the University of Arizona that has one of the world's best, if not the best, optical engineering and physics departments. The level of optics knowledge per capita in Tucson is higher than elsewhere, I'm sure. It was one of my target schools, and I went to another equally well reputed school that offered me more money
- Deane Clark
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Re: Street lights account for only 20% of light pollution?
It’s mainly because of the nearby observatories. Presence of UA and its strong astronomy program couldn’t hurtpkarri wrote: ↑Thu Nov 12, 2020 2:35 pm Not sure if this has any bearing on the street lighting code in Tucson, but Tucson is also home to the University of Arizona that has one of the world's best, if not the best, optical engineering and physics departments. The level of optics knowledge per capita in Tucson is higher than elsewhere, I'm sure. It was one of my target schools, and I went to another equally well reputed school that offered me more money
Deane Clark
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