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

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

How Does It Work

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.

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

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

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.

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

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

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

Backup Slides

Demonstration Performance Objectives

Demonstration Performance Objectives