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An Outdoor Lighting Revolution – The Transition to Solid-State LED Lighting Terry McGowan International Dark-Sky Association lighting@ieee.org
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The First Electric Outdoor Lighting NYC 1879 - 1881
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Menlo Park, NJ December 31, 1879
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4 Incandescent “Radial Wave” Luminaire 1940s
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Standard Full Cutoff “Cobra Head” Street Lighting Luminaires
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Lights of San Diego from Mt. Palomar
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7 Environmentally-Sensitive Outdoor Lighting
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LED-powered Roadway Lighting LED-Powered Roadway Lighting
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I-35 Bridge LED Lighting - Minneapolis
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LED Lighting – Lantern Retrofit
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LED Roadway and Area Lighting
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Correlated Color Temperature (CCT) - Kelvin Scale High Efficiency LED Metal Halide Incandescent High Pressure Sodium
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13 High CCT Light Source Issues: More Glaring Greater Scattering of Light Higher Impact on Circadian - -- - Rhythms
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Quality Outdoor Lighting Requirements See the effect, not the source No glare! Light only where and when needed Shine the light down Don’t over light Choose low CCT light sources (4000 Kelvins max.) Use energy efficient sources & Systems
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15 Terry McGowan, International Dark-Sky Association www.darksky.org lighting@ieee.org
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