LED Sports Lighting at Duke University Case Study: Williams Field at Jack Katz Stadium Casey A. Collins, PE, CEM Duke University Facilities Management Department 27 February 2015

Facilities Management Utilities & Engineering Services Duke Williams Field at Jack Katz Stadium  Varsity Field Hockey competition & practice  Intramural & recreational events  Host Site of the 2014 ACC Field Hockey Tournament

Facilities Management Utilities & Engineering Services Duke Project Execution – How to Improve Light?  Project Decision Milestones: –Add HID or convert to LED? –Any structural issues with existing poles? –Very tight timeline – less than 3 months to do something  Technical Issues: –Energy reduction –Longevity/Reliability –Siting – light trespass issues –Power quality & surge protection  Economic Issues –Maintenance savings primary –Energy savings secondary (low electric power rate) –Installation Costs –Life Cycle Cost checks

Facilities Management Utilities & Engineering Services Duke Sighting / Neighborhood Concerns Williams Field located in an urban neighborhood setting Light Trespass and glare are a major concern Adjacent to Duke East Campus are Residential & Mixed Use/Retail areas, and main N-S corridor through Durham Williams Field

Facilities Management Utilities & Engineering Services Duke Lighting – Technical Basics for Evaluation  Color Rendering Index (CRI): how “true” colors appears under an artificial light source  Color Temperature (CCT): The color hue of the light source itself  Efficacy: Lumen output per input Wattage  Illuminance: how much usable light ends up on a surface (foot-candles)

Facilities Management Utilities & Engineering Services Duke What Does LED Lighting Mean For Duke?

Facilities Management Utilities & Engineering Services Duke What’s Next?

Questions & Discussion