CIE在1967年推荐了日光光源。这些日光光源 含有紫外线辐射，其比例与室外自然日光中的比例相同。 在室内，日光通过窗户玻璃的透射而被过滤；因此 因此有必要定义室内日光的光谱功率分布 阶段。TC建议采用两种室内日光光源ID50和ID50 ID65，对应于约5000 K和6500 K的日光阶段。本出版物用英文编写，并用法文和英文进行简短总结 德国的它由22页5图2表组成。 相关色温。光谱表以5nm的间隔提供 从300纳米到780纳米，以及它们的发展原理和详细说明 与现有日光光源的比较。

The CIE recommended daylight illuminants in 1967. These daylight illuminants contained ultraviolet radiation in proportions as found in natural outdoor daylight. Indoors this daylight is filtered by the transmission of the window glass; therefore it became necessary to define spectral power distributions also for the indoor daylight phases. The TC recommends adoption of two indoor daylight illuminants ID50 and ID65, that correspond to the phases of daylight of about 5000 K and 6500 KThe publication is written in English, with a short summary in French and German. It consists of 22 pages with 5 figures and 2 tables. correlated colour temperature. Tables of the spectra are provided at 5 nm intervals from 300 nm to 780 nm, along with the rationale for their development and detailed comparison with existing daylight illuminants.