An Outdoor Lighting Revolution – The Transition to Solid-State LED Lighting Terry McGowan International Dark-Sky Association

The First Electric Outdoor Lighting NYC

Menlo Park, NJ December 31, 1879

4 Incandescent “Radial Wave” Luminaire 1940s

Standard Full Cutoff “Cobra Head” Street Lighting Luminaires

Lights of San Diego from Mt. Palomar

7 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

13 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

15 Terry McGowan, International Dark-Sky Association