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Mobile Light Pollution

Mobile Light Pollution

by Ian Ashdown | Feb 15, 2019 | Blog, Light Pollution, Roadway Lighting, Sports Lighting

Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd.   Published: 2016/01/21 At first glance, this appears to be an innocuous question: How much light pollution is attributable to automotive headlights? It is also a good question in that if...

Light Pollution and Uplight Ratings

Light Pollution and Uplight Ratings

by Ian Ashdown | Feb 15, 2019 | Blog, Light Pollution, Roadway Lighting

Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd.   Published: 2015/07/20 "Oh, East is East, and West is West, and never the twain shall meet." When Rudyard Kipling wrote this line in his poem The Ballad of East and West (Kipling 1892),...

Filtered LEDs and Light Pollution

Filtered LEDs and Light Pollution

by Ian Ashdown | Feb 15, 2019 | Architecture, Blog, Light Pollution, Roadway Lighting

Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd.   Published: 2016/03/03 UPDATE 2016/03/03 - Revised Figure 6. The problem is astronomical -- the blue light emitted by LED roadway luminaires has been shown to contribute to light...

Color Temperature and Outdoor Lighting

Color Temperature and Outdoor Lighting

by Ian Ashdown | Feb 15, 2019 | Blog, Light Pollution, Roadway Lighting

Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd. Published: 2015/07/22 UPDATE: Sports field lighting analysis added 15/10/12. [An edited version of this article was published as "STREET LIGHTS: Light pollution depends on the light source CCT"...

Botanical Light Pollution

Botanical Light Pollution

by Ian Ashdown | Feb 13, 2019 | Blog, Horticulture, Light Pollution, Roadway Lighting

Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd. Published: 2016/02/17 Blue-rich light from LED streetlights, we are told, is the nemesis of professional and amateur astronomers. Blue light is preferentially scattered by the atmosphere,...

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Recent Posts

  • Lighting Uniformity in Horticulture
  • Modeling Spherical Irradiance for UV-C Air Disinfection
  • Visible Light Disinfection

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