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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 16 — Aug. 2, 2010
  • pp: 17460–17476

Analysis of condition for uniform lighting generated by array of light emitting diodes with large view angle

Zong Qin, Kai Wang, Fei Chen, Xiaobing Luo, and Sheng Liu  »View Author Affiliations

Optics Express, Vol. 18, Issue 16, pp. 17460-17476 (2010)

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In this research, the condition for uniform lighting generated by array of LEDs with large view angle was studied. The luminous intensity distribution of LED is not monotone decreasing with view angle. A LED with freeform lens was designed as an example for analysis. In a system based on LEDs designed in house with a thickness of 20mm and rectangular arrangement, the condition for uniform lighting was derived and the analytical results demonstrated that the uniformity was not decreasing monotonously with the increasing of LED-to-LED spacing. The illuminance uniformities were calculated with Monte Carlo ray tracing simulations and the uniformity was found to increase with the increasing of certain LED-to-LED spacings anomalously. Another type of large view angle LED and different arrangements were discussed in addition. Both analysis and simulation results showed that the method is available for LED array lighting system design on the basis of large view angle LED..

© 2010 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(350.4600) Other areas of optics : Optical engineering
(220.2945) Optical design and fabrication : Illumination design
(080.4295) Geometric optics : Nonimaging optical systems

Original Manuscript: May 24, 2010
Revised Manuscript: June 26, 2010
Manuscript Accepted: July 12, 2010
Published: July 30, 2010

Zong Qin, Kai Wang, Fei Chen, Xiaobing Luo, and Sheng Liu, "Analysis of condition for uniform lighting generated by array of light emitting diodes with large view angle," Opt. Express 18, 17460-17476 (2010)

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