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

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

http://dx.doi.org/10.1364/OE.19.00A225

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### Abstract

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

**History**

Original Manuscript: February 10, 2011

Revised Manuscript: March 10, 2011

Manuscript Accepted: March 10, 2011

Published: March 23, 2011

**Citation**

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)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-S3-A225

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