在LED光学设计中，传统方法多以LED光源的远场测试数据为设计依据，而远场测试仅仅是对LED光源相对粗糙的测量，并不能精确地描述光源的空间光分布情况。对LED光源详细空间光分布信息的获取，即LED光线集的获取已经成为LED光学设计的瓶颈问题。获取并合理利用精确、详实的LED光源信息尤其是光源空间光分布信息是LED光学设计的关键点。分别利用单颗LED芯片和LED模块做了两组对照实验，并利用照明解析软件对获得的实验数据进行处理和分析，通过对比实验中光源远场测试和近场测试获得结果之间的差异，强调了通过LED光源近场测试获取光源光线集对LED光学设计的重要作用。实验结果表明，LED光源近场测量获取的光源光线集可以为LED光学设计提供更为详细的光源的光空间分布信息。

It is a traditional method to take obtained far-field data as the basis of LED optical design. However, far-field measurement, which is just relatively rough measuring of LED source, cannot describe the source′s space light distribution accurately. It has become a bottleneck problem of LED optical design to obtain detailed information of LED space light distribution, that is to obtain ray set. It is the key point to achieve and to use detailed and accurate information of LED source reasonably, especially information of light source′s spatial light distribution. This paper conducts two groups of experiments on LED chip and module, and then processes and analyzes the data gained in the experiments by using the lighting analytic software. By contrasting the difference in results of two test methods, the paper stresses the importance of obtaining ray set of light source to optical design. Final result shows that ray set obtained from near-field goniophotometer measurement can offer more detailed spatial distribution information of light source for LED optical design.