led sports lighting at duke university case study: williams field at jack katz stadium casey a....
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LED Sports Lighting at Duke UniversityCase Study: Williams Field at Jack Katz Stadium
Casey A. Collins, PE, CEMDuke University Facilities Management Department
27 February 2015
Facilities ManagementUtilities & Engineering ServicesDuk
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Williams Field at Jack Katz Stadium
Varsity Field Hockey competition & practice
Intramural & recreational events
Host Site of the 2014 ACC Field Hockey Tournament
Big Problem: Not Enough Light for Competition or
Videography
Facilities ManagementUtilities & Engineering ServicesDuk
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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 ManagementUtilities & Engineering ServicesDuk
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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
Resi
denti
al
Mix
ed U
se
Facilities ManagementUtilities & Engineering ServicesDuk
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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 ManagementUtilities & Engineering ServicesDuk
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LED solution are 1000W, but only require 56 lamps for more than 7x illuminance
What Does LED Lighting Mean For Duke?
Maintenance Savings: $6K/yr
Energy Savings: 40-50%
Increased Operational FlexibilitySatisfied Coaches & Players
Before Lighting Retrofit: 9 foot-candles After Lighting Retrofit: 75 foot-candles
Happy Broadcasters
Existing Lights were 1000W metal halide lamps, 88 across 6 poles
LED solution avoided an additional 55 MH lamps to increase illumination, and avoided pole redesign due to structural issues
Facilities ManagementUtilities & Engineering ServicesDuk
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What’s Next?
Questions & Discussion