High-performance LED Street Lighting using Microlens Arrays

A new LED street luminaire has been proposed by the authors and its performance analyzed. This LED lamp delivers a rectangle light pattern that maximizes illumination performance by directing light only where is needed. The light is efficiently and homogeneously distributed. This is a requirement for reducing glare as well as improving both the eye comfort and the visual discrimination ability of car drivers. The optical concept is both simple and effective: an array of LEDs with TIR lenses are put inside a reflective cavity, which is covered with a microlens sheet. The reflective box improves efficiency by recycling the back-reflected light with each TIR lens efficiently collimates the LED light for the microlens array. The microlens plate combines beam shaping and light diffusion to efficiently and homogeneously deliver light into the street. The authors have assessed the luminaire performance by Monte Carlo ray-tracing for the main types of street pole arrangements: central, zigzag, and single-side. The lamp achieved high optical utilization factors from 58% to 81%, which are high even compared with excellent designs. The authors LED street-light achieved the expected performance, which was set at the highest levels specified by the market and the IESNA.


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01484548
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 20 2013 4:38PM