二次光学是直接决定舞台灯的输出效率、均匀度的重要环节。绿色环保的舞台照明要求LED舞台灯能够在增加总光通量的前提下，于30 m远处，形成一个4~6 m的均匀圆形光斑。而目前市场上的LED舞台灯在远距离的照明方面，不论是输出效率还是光斑的均匀性，都难以满足舞台照明的需求。设计了一种照明设计的模型，可以实现较高的输出功率和较均匀的圆形光斑。采用匀光棒、反光棱镜和反光碗的组合，可以比较好地实现远距离的照明要求。且该模型易于加工，最终的输出效率可以达到26%左右。

A LED secondary-optics designing is an important step which decides the output efficiency and the uniformity of stage lighting. A green stage lighting requires that LED stage lights can increase the total flux and form a 4~6 m uniform circular spot at 30 m away. However, the LED stage lights currently on the market cannot meet these requirements. This article describes a new model of lighting design which can achieve both higher output power and more uniform circular spot. The model uses a uniform light stick, reflective prism and reflector to meet a longrange requirements. And the final output efficiency can be as high as 26%.