volume 24, issue 2, P217-223 2015
DOI: 10.7735/ksmte.2015.24.2.217
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Abstract: ABSTRACTArticle history:In this paper, the performance of a system was analyzed according to the design parameters of a LED secondary lens that can be applied at a very close range, e.g., for direct lighting or display systems. We designed the secondary lens of the very-close-range LED using an aspheric equation and analyzed its performanceparticularly the angle of the beam spread, central luminous intensity, and light uniformity-with respect to the thickness of lens, radius, conic constant, and asphericity (…

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