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Desert Foothills Astronomy Club

Explore the impact of light pollution and efforts to minimize it, from regulations to new technologies. Learn how shielding outdoor light fixtures can help preserve dark skies. Discover what communities like Flagstaff and Tucson are doing to combat light pollution and promote stargazing. Find out about different lighting options and how you can contribute to preserving our night skies.

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Desert Foothills Astronomy Club

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  1. Desert Foothills Astronomy Club www.dfacaz.org

  2. International Dark-Sky Association

  3. LIGHT POLLUTION Where We Are In 2016

  4. The LA earthquake of 1994: “I got 3 dozen phone calls about the ‘weird sky’ and whether it was caused by the earthquake!” — Director Ed Krupp, Griffith Observatory

  5. ONTARIO AUGUST 13, 2003

  6. ONTARIO AUGUST 14, 2003

  7. WASTED LIGHT …$1.5 BILLION ANNUAL COST = 6 MILLION TONS OF COAL = 24 MILLION BARRELS OF OIL ( just in the USA )

  8. Phoenix seen from orbit in 2016 — Courtesy of IDA

  9. 10:30 PM

  10. 11:30 PM

  11. 12:30 AM

  12. MEAN = 36.98 MEDIAN = 27 MEAN = 35.38 MEDIAN = 25 MEAN = 34.13 MEDIAN = 24

  13. MCZO Article 1112: Shielding of Outdoor Light Fixtures All outdoor light fixtures (except those exempt from this ordinance) shall be fully or partially shielded as required in Article 1112.4.2. Exemptions: Fixtures installed before 1985, LP sodium, fossil fuel, neon, incandescent fixtures of one hundred fifty watts or less and other sources of seventy watts or less. Streetlight fixtures are also exempt if shielding is not available from the manufacturer.

  14. ARS 49-7: Light Pollution All outdoor light fixtures shall be fully or partially shielded except incandescent fixtures of one hundred fifty watts or less and other sources of seventy watts or less. [Note: Billboards are considered “outdoor light fixtures.”] In addition to other exemptions provided in this article, outdoor light fixtures not meeting the provisions of this article shall be allowed provided such fixtures are extinguished between the hours of midnight and sunrise by an automatic shutoff device.

  15. WHAT’S BEING DONE?

  16. Flagstaff: 1958 world’s first lighting ordinance • Tucson: 1972 to protect Kitt Peak • Pima County: 1972 following Tucson’s lead • Arizona: 1985 ARS Title 49 Chapter 7 • Maricopa County: 1985 Zoning Ordinance • 2001: IDA establishes International Dark Sky Places • Arizona: 2003 ARS (shielded street lights) • 2005-10: IDA expands Dark Sky program to include certification for Communities, Parks, Reserves, Sanctuaries

  17. HB 2507

  18. OK, SO SHIELDING IS A GOOD THING, BUT WHAT ELSE CAN BE DONE?

  19. CONTINUOUS SOLAR INCANDESCENT METAL HALIDE FLUORESCENT MERCURY VAPOR HP SODIUM LP SODIUM IKEA MULTI-LED PHILIPS SOFT WHITE LED

  20. WHAT CAN YOU DO?

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