An Outdoor Lighting Revolution –

The Transition to Solid-State LED

Lighting

Terry McGowan

International Dark-Sky Association

lighting@ieee.org

The First Electric Outdoor Lighting

NYC 1879 - 1881

Menlo Park, NJ December 31, 1879

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Incandescent “Radial Wave” Luminaire 1940s

Standard Full Cutoff

“Cobra Head” Street Lighting Luminaires

Lights of San Diego from Mt. Palomar

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• Environmentally-Sensitive Outdoor Lighting

LED-powered Roadway Lighting

LED-Powered Roadway Lighting

I-35 Bridge LED Lighting - Minneapolis

LED Lighting – Lantern Retrofit

•LED Roadway and Area Lighting

Correlated Color Temperature (CCT) - Kelvin Scale

High Efficiency LED

Metal Halide

Incandescent

High Pressure Sodium

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High CCT Light Source Issues:

More Glaring

Greater Scattering of Light

Higher Impact on Circadian - --- Rhythms

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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Terry McGowan, International Dark-Sky Association

www.darksky.org

lighting@ieee.org