A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting. LEDs present many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved robustness, smaller size, faster switching, and greater durability and reliability. However, they are relatively expensive and require more precise current and heat management than traditional light sources.
Various jurisdictions across the United States are taking steps to reduce energy consumption by introducing and testing the use of LED street lights. It is envisaged that the use of LED street lights will reduce the cost of energy of various municipalities. The District Department of Transportation (DDOT) is exploring new advances in lighting technology to reduce energy and operating costs. DDOT is initiating this pilot project to install and test various new lighting technologies including LED street lighting fixtures.
The Howard University Transportation Research Center (HUTRC) submits the FINAL EVALUATION REPORT: Light-Emitting Diode (LED) Energy Efficient Streetlight Evaluation Study. The project team conducted a literature review, obtained samples and specifications of LED lights from vendors, suppliers and/or manufacturers. The LED lights from the suppliers/vendors were evaluated based on DDOT’s (and industries) minimum mechanical, electrical and lighting specifications, appearance and field reviews.
An additional report, LED STREET LIGHTS: Field and Laboratory Evaluation Results, describes the results of the field and laboratory evaluation of sample LED street lighting fixtures procured by Science Applications International Corporation (SAIC) and the Virginia Tech Transportation Institute (VTTI) under contract to the Washington, DC Department of Transportation (DDOT). The results of this report will inform DDOT’s decision to incorporate one or more LED fixtures into its catalogue of standard fixtures.