描述了两种方法:第一种方法使用光谱辐射计，它给出被测量光源的光谱能量分布，从中可以计算色度:第二种方法使用三刺激色度计，它采用光敏器件和滤光片的组合，在适当的场角下再现光谱三刺激值的分布。

Describes two methods: the first method uses a spectroradiometer, which gives a spectral energy distribution of the light source being measured from which the chromaticity can be calculated: the second method uses the tristimulus colorimeter, which employs a combination of a photosensitive device and a filter to reproduce the distribution of spectral tristimulus values for the appropriate field angle.