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Bi-Level Demand-Sensitive LED Street Lighting Systems

Smart bi-level demand-sensitive LED lighting system for outdoor street lighting applications, allowing dimming and traffic sensing for energy savings. Controller adjusts light intensity based on preset levels and traffic detection. Success demonstrated with over 70% energy savings. Challenges include wireless communication restrictions and contractor regulations. Financial considerations show annual electricity savings and positive savings-to-investment ratio. Pros include superior efficacy and quality, longer life, reduced maintenance, speedy response time, and waste disposal reduction. Learn more from ESTCP and Carderock contacts.

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Bi-Level Demand-Sensitive LED Street Lighting Systems

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  1. Bi-Level Demand-Sensitive LED Street Lighting Systems Insert base name

  2. Technology Description • Smart bi-level demand-sensitive LED lighting system for outdoor street lighting applications, allows dimming as well as vehicle and pedestrian traffic sensing capability through a centralized controller

  3. How Does It Work

  4. How Does It Work Continued • LEDs are turned ON after the sunset (with a photocell sensor), and its light intensity is dimmed in two stages (80% intensity from 9pm to 11pm and 60% intensity from 11pm to 4am) to allow additional energy savings. • As soon as foot/vehicle traffic is detected, the light intensity is set back to 100% for about five minutes. All LEDs are turned OFF simultaneously at sunrise. • Both Intensity levels and activation times are adjustable.

  5. Benefits of the Technology • Energy saving, better light quality, and infrastructure savings • Streetlight controllers to enable bi-level and demand-sensitive features • The integration of traffic sensors for detecting moving traffic • The use of a smart server to perform light control

  6. Technology Success Stories • Technology has been successfully demonstrated by ESTCP at Naval Surface Warfare Center (NSWC), Carderock Division in West Bethesda, MD • Demonstrated energy savings from baseline system exceeded 70% • Light-emitting diode (LED) luminaires were substituted for existing High Pressure Sodium (HPS) street lighting units

  7. Potential Challenges and Solutions • Restrictions on wireless communications • The facility must review and approve the operation of some wireless equipment under frequency management and cyber security regulations. A system data sheet must be completed for each wireless transmitting and receiving component and submitted prior to installation to the competent controlling agency. • Restrictions on installation contractors • All electrical work on the base must be performed by State licensed and bonded contractors who have appropriate clearances to perform activities on the installation.

  8. Sample Financial Considerations • Estimated budget Costs • Annual electricity savings of the LED as compared to its HPS counterparts were recorded at 11,060 kWh • Simple payback period 6.0 • Savings-to-Investment Ratio (SIR) 2.15

  9. Bottom Line • Pros • Superior luminous efficacy • Superior light quality • Longer life • Reduced Maintenance Expenses • Instantaneous response time • Reduction in waste disposal • Cons • Initial Acquisition Costs

  10. Where to Learn More • Mr. Tim Tetreault, ESTCP Energy and Water Program Manager, 571-372-6397 • SERDP-ESTCP Website, https://serdp-estcp.org • Mr. Greg Cancila, POC at Carderock, 215-897-7607, Gregory.cancila@navy.mil • Dr. Saifur Rahman, POC at Virginia Tech, 571-858-3300, srahman@vt.edu

  11. Backup Slides

  12. Demonstration Performance Objectives

  13. Demonstration Performance Objectives

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