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Opt Express. 2011 May 9;19 Suppl 3:A225-33. doi: 10.1364/OE.19.00A225.

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

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  • 1Laboratory of Diffraction Optics, Image Processing Systems Institute of the RAS, Molodogvardeyskaya st. 151, Samara 443001, Russia.


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%.

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