Optical System Design

Free-form lenses for high illumination quality light-emitting diode MR16 lamps

[+] Author Affiliations
Fei Chen

National Laboratory for Optoelectronics,Division of MOEMS, and Huazhong University of Science and Technology,School of Optoelectronics Science and Engineering, Wuhan, 430074 China

Sheng Liu

National Laboratory for Optoelectronics,Division of MOEMS, and Huazhong University of Science and Technology,Institute for Microsystems, School of Mechanical Engineering, and School of Optoelectronics Science and Engineering,Wuhan, 430074 China

Kai Wang

National Laboratory for Optoelectronics,Division of MOEMS, and Huazhong University of Science and Technology,School of Optoelectronics Science and Engineering, Wuhan, 430074 China

Zongyuan Liu

National Laboratory for Optoelectronics,Division of MOEMS, and Huazhong University of Science and Technology,Institute for Microsystems, School of Mechanical Engineering, Wuhan, 430074 China

Xiaobing Luo

National Laboratory for Optoelectronics,Division of MOEMS, and Huazhong University of Science and Technology,School of Energy and Power Engineering, Wuhan, 430074 China

Opt. Eng. 48(12), 123002 (December 21, 2009). doi:10.1117/1.3274677
History: Received April 13, 2009; Revised September 22, 2009; Accepted October 20, 2009; Published December 21, 2009; Online December 21, 2009
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Light-emitting diode (LED) MR16 lamps, regarded as one typical general lighting product of LEDs, are being widely used in many applications. Light efficiency into a main beam and uniformity are two key issues for high quality illumination of LED MR16 lamps. In this study, a practical and precise nonimaging optical design method is presented, and two novel 90- and 120-deg free-form lenses for high illumination quality LED MR16 lamps are designed according to this method. Based on the Monte-Carlo ray-tracing method, numerical simulation results demonstrate that the light output efficiencies of these novel lenses reach as high as 98% and are 17% higher than that of traditional total internal reflection (TIR) MR16 lens. Moreover, more than 89% of light exiting from the surfaces of these novel lenses irradiate within the desired receive target, while only 60% irradiate for traditional TIR lens. The uniformities of illuminance distribution across the target of these novel MR16 lamps also are much higher. In addition, these novel lenses are both quite compact and no more than 15 of that of the TIR lens. Therefore, these LED MR16 lamps integrated by novel lenses provide an effective solution to high quality illumination.

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© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Fei Chen ; Sheng Liu ; Kai Wang ; Zongyuan Liu and Xiaobing Luo
"Free-form lenses for high illumination quality light-emitting diode MR16 lamps", Opt. Eng. 48(12), 123002 (December 21, 2009). ; http://dx.doi.org/10.1117/1.3274677


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