Bringing back the Night Sky: Lighting In Toronto Parks Peter Hiscocks, RASC 12 August 2010.
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Transcript of Bringing back the Night Sky: Lighting In Toronto Parks Peter Hiscocks, RASC 12 August 2010.
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Bringing back the Night Sky:
Lighting In Toronto Parks
Peter Hiscocks, RASC12 August 2010
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The Royal Astronomical Society of Canada (RASC)
Mandate: to stimulate interest and increase knowledge in astronomy
29 Centres across Canada
4000 members, 700 in the Toronto Centre
2 Meetings per month, 2 sky observing sessions, activities at the David Dunlap Observatory
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The Great Blackout, August 2003
Photo credit Todd Carlson, Goodwood ON Photo credit Todd Carlson, Goodwood ON
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Light Pollution Map
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Toronto at Night
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Skyglow over Calgary
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What can you see?
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Solar Observing
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Active Sun
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Evening Observing
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Toronto parks are an excellent venue for viewing the night sky.
Accessible by the public, safe, good sight lines....
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...except for the problem of obtrusive light and glare
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Lighting Issues
Glare from unshielded fixtures: Top-Hat and Wall-Pack
Unattended and unshielded sports lighting
Car headlights
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Withrow Park Soccer Field
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Withrow Park Soccer Field
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'Top Hat' Light Standard
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Top Hat Light Standard
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Withrow Park Glare Problem
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Defining Glare
Glare: contrast lowering effect of stray light in a visual scene.
Glare forms a veil of luminance which reduces the contrast and thus decreases the visibility of a target. We cannot see intensity differences efficiently in the presence of a high background of light intensity.
The sensitivity to glare is amplified with age as scattering in cornea or lens increases.
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Solution
Full-cutoff fixture that directs light downward
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Boardwalk Lamp
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Boardwalk Lamp Coverage
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Wall Pack Problem Light
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Wall-Pack Problem Light
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Wall-Pack Problem Light
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Wall-Pack Problem Light
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Colonel Samuel Smith Park
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Colonel Samuel Smith Park
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Full Cut-off Illuminators of the Night
Energy efficient too!Energy efficient too!
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Unattended/Unshielded Sports Lighting
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Withrow Park Skating Rink
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Rink Night Shot: No People
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Rink Night Shot
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Beach Pool Lighting
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Beach Pool Fixture Closeup
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Beach Pool Lighting
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Chicago Study on Lighting and Crime
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Recommendations
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High Park Proposed Viewing Site
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High Park Baseball Diamond
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High Park Baseball Diamond
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High Park Recommendations
Control baseball lighting with vegetation barrier
Add shielding to Tennis Court lights
Replace Wall-Packs with cutoff fixtures
High Park Recommendations
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Withrow Park Viewing Sites
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Withrow Park Recommendations
Replace 'Top-Hat' fixtures with full-cutoff
Extinguish arena lamps when not being used
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Marie-Curtis Viewing Site
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Marie-Curtis Recommendations
Replace 'Top-Hat' fixtures with full-cutoff
Berm or foliage between parking lot and observing site
Avoid Wall-Packs in building resdesigns
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Overview and Summary
Park lighting is a mix: some effective, some problematic
Energy efficiency and light pollution can be reduced with modified or new fixtures
With minor fixes, parks could become much more hospitable to public sky observing activities
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The Payoff
Hundreds of Torontonians get an introduction to the night sky.
Parks and Rec credited for first 'Urban sky park' areas in North America.
Aligns with Parks Canada, 12 dark sky preserves
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