Session 8C - Lewis.pdf - ITE Western District
Transcript of Session 8C - Lewis.pdf - ITE Western District
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LED versus HPS Lighting:A Shoot‐Out on the Nason Street Corral
Presented at theITE District 6 Annual Meeting
Phoenix, AZJuly 17, 2013
Authors:
Eric Lewis, P.E., T.E., City Traffic EngineerJohn Kerenyi, P.E., Senior Engineer
City of Moreno Valley
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Summary of Presentation
• Why is Nason Street a corral?• Comparison of Lighting Performance• Comparison of Electricity Consumption• Comparison of Costs
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Nason Street
• Connects hospitals • Direct freeway access• 1 mile of new roadway (no traffic)• $10 million construction cost• Vacant adjacent land (no stray light)• No moonlight
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Street Lighting System
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Analysis Area
Boundary betweencircuits
Current measurementsconducted here
Photometric grid
Limits of HPS vs. LED Analysis
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HPS Bulb Position Is Adjustable• Bulb position is adjustable in two dimensions
• Type 3 Medium Distribution assumes a certain bulb position
• Incorrect positioning can result in unsatisfactory performance
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LED Observed vs. Predicted
Observed Predicted
Average Illuminance: 15.7 luxAvg/Min Ratio: 16:1
Average Illuminance: 17.7 luxAvg/Min Ratio: 4:1
IES Recommendation:Average Illuminance: 9 lux (exceeded)Avg/Min Ratio: 3:1 (less than recommended)
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HPS Observed vs. Predicted
Observed Predicted
Average Illuminance: 13.0 luxAvg/Min Ratio: 13:1
Average Illuminance: 18.4 luxAvg/Min Ratio: 4:1
IES Recommendation:Average Illuminance: 9 lux (exceeded)Avg/Min Ratio: 3:1 (less than recommended)
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Observed: LED vs. HPS
LED Observed HPS Observed
Average Illuminance: 15.7 luxAvg/Min Ratio: 16:1
Average Illuminance: 13.0 luxAvg/Min Ratio: 13:1
IES Recommendation:Average Illuminance: 9 lux (exceeded)Avg/Min Ratio: 3:1 (less than recommended)
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Predicted: LED vs. HPS
LED Predicted HPS Predicted
Average Illuminance: 17.7 luxAvg/Min Ratio: 4:1
Average Illuminance: 18.4 luxAvg/Min Ratio: 4:1
IES Recommendation:Average Illuminance: 9 lux (exceeded)Avg/Min Ratio: 3:1 (less than recommended)
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Electrical Consumption
Circuit isolated – 5 lights total
185W LED – 2.12 kWh / night
200W HPS – 2.60 kWh / night
22.53% more energy consumed by HPS lights
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Comparison of Costs
Initial installation cost
LS-1 vs. LS-3
Replacement schedule
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Further research
Gather more data
Long term degradation
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Questions?