An optimisation of a freeform lens design for LED street lighting

The number of light emitting diodes (LEDs) used in a variety of applications is increasing rapidly. A good example of an application where this is happening is street lighting. The increasing use of LEDs is due to their advantages compared to other sources of illumination. However, LEDs are not without disadvantages. One of their main drawbacks when used for street lighting without an adequate secondary optic is that they tend to produce a circular footprint with high intensity at the centre and low intensity at the edge of the illuminated area, which prevents them from satisfying national and international standards for uniformity of illumination. This paper presents a new energy mapping method to design a freeform lens to generate uniform illumination of over 95% on the target plane. The lenses presented in this paper have been designed with two different entrance apertures: (i) A hemisphere subtracted aperture (ii) a flat entrance aperture.

[1]  Leonid L Doskolovich,et al.  Design of high-efficient freeform LED lens for illumination of elongated rectangular regions. , 2011, Optics express.

[2]  A Antal Haans,et al.  Light distribution in dynamic street lighting: Two experimental studies on its effects on perceived safety, prospect, concealment, and escape , 2012 .

[3]  Xu Liu,et al.  Freeform LED lens for uniform illumination. , 2008, Optics express.

[4]  Christian Brecher,et al.  Off-axis machining of NURBS freeform surfaces by Fast Tool Servo Systems , 2006 .

[5]  Asghar Akbari,et al.  Partial discharge defects classification using neuro-fuzzy inference system , 2010, 2010 10th IEEE International Conference on Solid Dielectrics.

[6]  R. Ramirez-Iniguez,et al.  Analysis of uniformity of illumination of a freeform lens when combined with different optical sources , 2016, SPIE OPTO.

[7]  Xu Liu,et al.  Optimization design of irradiance array for LED uniform rectangular illumination. , 2012, Applied optics.

[8]  R. Ramirez-Iniguez,et al.  Performance analysis of a DTIRC-LED illumination structure , 2015, Other Conferences.

[9]  Julio Chaves,et al.  Review of SMS design methods and real-world applications , 2004, SPIE Optics + Photonics.

[10]  R. Ramirez-Iniguez,et al.  Novel non-imaging optic design for uniform illumination , 2016, SPIE OPTO.

[11]  Seyed Mohammad Ghoreyshi,et al.  An inherently void avoidance routing protocol for Underwater Sensor Networks , 2015, 2015 International Symposium on Wireless Communication Systems (ISWCS).