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本文用几何光学基本定律对两种不同外形发光管的光学性能作了一般性的分析和探讨。通过具体的计算，从等效发光点、可被利用光能、聚光性能和使用场合等方面对它们进行了比较，用以指导光路设计，并提出了改进建议
In this paper, the basic laws of geometrical optics are used to analyze and discuss the optical properties of two different shape LEDs. Through the specific calculation, from the equivalent light-emitting point, can be used light energy, condenser performance and the use of occasions compared to them, to guide the optical design, and made recommendations for improvement