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Energies 2017, 10(12), 2091;

LED Uniform Illumination Using Double Linear Fresnel Lenses for Energy Saving

Department of Information and Communication Engineering, Myongji University, San 38-2 Nam-dong, Yongin 449-728, Korea
Authors to whom correspondence should be addressed.
Received: 9 November 2017 / Revised: 4 December 2017 / Accepted: 6 December 2017 / Published: 11 December 2017
(This article belongs to the Special Issue Solid State Lighting)
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We present a linear Fresnel lens design for light-emitting diode (LED) uniform illumination applications. The LED source is an array of LEDs. An array of collimating lens is applied to collimate output from the LED array. Two linear Fresnel lenses are used to redistribute the collimated beam along two dimensions in the illumination area. Collimating lens and linear Fresnel lens surfaces are calculated by geometrical optics and nonimaging optics. The collimated beam output from the collimating lens array is divided into many fragments. Each fragment is refracted by a segment of Fresnel lens and distributed over the illumination area, so that the total beam can be distributed to the illumination target uniformly. The simulation results show that this design has a compact structure, high optical efficiency of 82% and good uniformity of 76.9%. Some consideration of the energy savings and optical performance are discussed by comparison with other typical light sources. The results show that our proposed LED lighting system can reduce energy consumption five-times in comparison to using a conventional fluorescent lamp. Our research is a strong candidate for low cost, energy savings for indoor and outdoor lighting applications. View Full-Text
Keywords: geometric optical design; illumination design; light-emitting diodes; nonimaging optics geometric optical design; illumination design; light-emitting diodes; nonimaging optics

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Vu, N.H.; Pham, T.T.; Shin, S. LED Uniform Illumination Using Double Linear Fresnel Lenses for Energy Saving. Energies 2017, 10, 2091.

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