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Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S3 — May. 9, 2011
  • pp: A225–A233

Design of high-efficient freeform LED lens for illumination of elongated rectangular regions

Mikhail A. Moiseev, Leonid L. Doskolovich, and Nikolay L. Kazanskiy  »View Author Affiliations

Optics Express, Vol. 19, Issue S3, pp. A225-A233 (2011)

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We propose a method for the design of an optical element generating the required irradiance distribution in a rectangular area with a large aspect ratio. Application fields include streetlights, the illumination of halls or corridors, and so forth. The design assumes that the optical element has a complex form and contains two refractive surfaces. The first one converts a spherical beam from the light source to a cylindrical beam. The second one transforms an incident cylindrical beam and generates the required irradiance distribution in the target plane. Two optical elements producing a uniform irradiance distribution from a Cree® XLamp® source in rectangular regions of 17 m × 4 m and 17 m × 2 m are designed. The light efficiency of the designed optical element is larger than 83%, whereas the irradiance nonuniformity is less than 9%.

© 2011 OSA

OCIS Codes
(080.2740) Geometric optics : Geometric optical design
(080.4298) Geometric optics : Nonimaging optics

Original Manuscript: February 10, 2011
Revised Manuscript: March 10, 2011
Manuscript Accepted: March 10, 2011
Published: March 23, 2011

Mikhail A. Moiseev, Leonid L. Doskolovich, and Nikolay L. Kazanskiy, "Design of high-efficient freeform LED lens for illumination of elongated rectangular regions," Opt. Express 19, A225-A233 (2011)

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