In this work, a scheme of combining an aspheric reflector and a primary packaging freeform lens in phosphor-converted lighting-emitting diode (pc-LED) based lighting system design was developed. In contrast to most of previous works in which the color and illumination uniformity of the pc-LED lighting systems were improved one by one, the developed scheme can improve both indicators simultaneously. To demonstrate the feasibility of the developed design scheme, an initially designed pc-LED optical model, with an average correlated color temperature (CCT) of about 5000 K, was constructed as the light source of the illumination system. The key ingredient to the color uniformity of the illumination system was investigated at first, and then several instances with the cut-off angle ranging from 40 to 60 degrees were further discussed. Detailed analysis shows: for each case, the CCT variation decreases from over 4000 K to smaller than 300 K and the illumination uniformity increases from a very low level to better than 80% on the target region.

中文翻译：

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考虑照明和颜色均匀性的基于荧光粉转换的 LED 照明系统的设计

在这项工作中，开发了一种在基于荧光粉转换发光二极管 (pc-LED) 的照明系统设计中结合非球面反射器和初级封装自由曲面透镜的方案。与之前的大部分作品都对pc-LED照明系统的色彩和照度均匀性进行了逐一提高相比，所开发的方案可以同时提高这两个指标。为了证明所开发设计方案的可行性，构建了一个初始设计的 pc-LED 光学模型，其平均相关色温 (CCT) 约为 5000 K，作为照明系统的光源。首先研究了照明系统颜色均匀性的关键因素，然后进一步讨论了截止角范围为 40 到 60 度的几种情况。