An optimisation of a freeform lens design for LED street lighting

Sina Babadi, Roberto Ramirez-Iniguez, Tuleen Boutaleb, Tapas Mallick

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    7 Citations (Scopus)
    366 Downloads (Pure)


    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.
    Original languageEnglish
    Title of host publication2016 International Conference for Students on Applied Engineering, ICSAE 2016
    Number of pages4
    ISBN (Electronic)9781467390538
    Publication statusPublished - 9 Jan 2017


    • LED
    • street lighting
    • freeform lens
    • illumination


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