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29 September 2004 Effects on illumination uniformity due to dilution on arrays of LEDs
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Light sources consisting of multiple Light-Emitting Diodes (LEDs) are becoming the preferred choice for many lighting applications that require uniform illumination distribution. However, packaging density of LED arrays is limited by cost, available space, and particularly by thermal problems. Therefore low density or diluted arrays of LEDs are becoming the option for many applications. This paper presents an investigation of the effects on illumination uniformity due to dilution on light sources consisting of multiple LEDs. The characteristics of illumination uniformity are obtained for several diluted-array configurations and degrees of dilution. This analysis is performed using a radiometric analysis, and considering each LED as an imperfect Lambertian emitter. Analytical expressions are derived for the maximum degree of dilution for different configurations of LED arrays.
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Ivan Moreno and Roumen I. Tzonchev "Effects on illumination uniformity due to dilution on arrays of LEDs", Proc. SPIE 5529, Nonimaging Optics and Efficient Illumination Systems, (29 September 2004);

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