照度计和亮度计的特性由ISO/CIE 19476:2014《照度计和亮度计性能的表征》中定义的若干选定质量指标表征，该标准先前发布为CIE S 023:2013。CIE 231:2019总结了现有的国家和地区照度计和亮度计分类系统，并推荐了CIE分类系统。与现有系统一样，拟议的CIE分类系统基于不同指数的限值；但与所有现有系统不同的是，在分类中明确考虑了质量指标确定的不确定性。在附录中，建议在适当的情况下考虑一些与应用相关的要求。 CIE分类系统为每个质量指数赋予一个等级，从4*到1*，其中4*是最佳质量。所有质量指标的最低等级指定了仪器的等级。它是第一个国际认可的光度测量设备分类系统。

The properties of illuminance meters and luminance meters are characterized by a number of selected quality indices defined in ISO/CIE 19476:2014 "Characterization of the Performance of Illuminance Meters and Luminance Meters", previously published as CIE S 023:2013. CIE 231:2019 summarizes existing national and regional classification systems of illuminance meters and luminance meters and recommends a CIE classification system. Like existing systems, the proposed CIE classification system is based on limit values for the different indices; but differently to all existing systems, the uncertainty of the determination of the quality indices is explicitly considered in the classification. In the annex some application-related requirements are recommended that should be considered where appropriate. The CIE classification system attributes a class to each quality index from 4* down to 1*, where 4* is the best quality. The lowest class of all quality indices specifies the class of the instrument. It is the first internationally agreed classification system for photometric measurement devices.