LED光源反射器特征参数对被照面照度的影响

在普通LED照明应用中，常采用多颗LED光源加装抛物线型反射器来满足照明要求。本文以9颗LED光源为例，探讨抛物线型反射器特征参数对被照面照度的影响。模拟结果表明：反射器长度不变，焦距越小，光能聚集效果越好；反射器口径不变，随着焦距的增大，被照面照度分布由光斑逐渐变为光环，中心照度逐渐降低；反射器焦距不变，随着口径的减小，被照面中心区域的照度几乎不变，但两侧的照度略有下降。在反射器口径面加装磨砂透光板后，被照面聚光区域的照度下降明显，但是被照面照度分布更加均匀；按环形排列方式增加LED光源的数目仅增大被照面的照度。

The Influence of the Parabolic Reflector Characteristic Parameters on the Illuminance of the LED Light

In order to meet the lighting needs, the multi-LED light sources and the parabolic reflector are usually applied in the ordinary LED lighting. Taking 9-LED light source as an example, the influences of the parabolic reflector characteristic parameters on the illuminance of the illuminated target plane are discussed. The results show that, for the fixed reflector length, the smaller focal length, the better is the effect of light gathering. For the fixed reflector aperture, the illuminance shape gradually changes from speckle to halo and the ifluminance at the central region gradually decreases with the increase of the focal length. When the reflector focal length is fixed, the illuminance at edge region slightly decreases and the illuminance at central region position is almost constant with the decrease of the diameter. With the frosted glass installed at the aperture plane, the illuminance of the whole target plane significantly decreases and the illuminance distribution is more uniform. However, the increase in number of LED light source only increases the illuminance.