基于光与物质相互作用的原理及农产品的基本光特性，研究了一款用于铁观音茶叶和杂质分选的LED 茶叶色选灯光源，并对其光谱进行了研究和设计。通过测试茶叶和杂质的反射光谱，在可见光谱范围内，将茶叶与杂质相对反射率差值较大时对应的光波长作为选择LED 光源的峰值波长，利用多色LED 组合对茶叶色选灯光源光谱进行匹配，LED 组合光源的数量比例由各个峰值波长处对应的茶叶和杂质的相对反射率差值的比例决定。结果表明，该LED 茶叶色选灯光源具有高光效特性，寿命长，能提高茶叶与杂质的对比度及茶叶的加工效率，有利于茶叶的挑选加工；为后续用于其他茶叶色选的新型LED 茶叶色选灯光源的开发及特殊照明用LED 光源光谱的设计奠定了基础。

Based on the principle of light and matter interaction and the basic optical characteristics of agricultural products, a model for LED tea color sorter light source is studied to sort Tieguanyin tea and impurities, and the light source spectrum is studied and designed. By testing the spectral reflectance of the tea and impurities, the wavelength at which the tea and impurities have the maximum reflectivity difference is chosen as the peak wavelength of LED light sources in the range of visible light. The combination of multicolor LEDs is used to match the spectra of tea color sorter light source, and the numerical ratio of combinational LED light sources is decided by the proportion of relative reflectivity difference between tea and impurities at each corresponding peak wavelength. The results show that the tea color sorter light source can improve the processing efficiency of tea sortering and enlarge the contrast between tea and impurities with higher luminous efficiency characteristics and long lifetime, and it is beneficial to the sorter process of tea. Therefore, the study lays foundation for subsequent development of new LED tea color sorter light sources used for other tea color sorting and spectral design for special LED-based light sources.