In this study, pattern search was used to optimize the secondary optical lens for LED lighting. Under the assumption of point light source, the lens with uniform illumination can be constructed by using energy mapping relationship and Snell's law. However, the non-uniform illumination is found in the luminaire designed with LED light source due to the size effect. Although larger LED lens can eliminate the size effect, the drawbacks are complex mechanical assembly of luminaire and higher production cost. Therefore, the pattern search was implemented to adjust the designed parameters of lens for keeping a uniform illumination without increasing the size of lens, so that the size effect of LED is less obvious.
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