This standard specifies in detail the terms and definitions, basic types and parameters, requirements, test methods, inspection rules, marking Encasement, transportation and storage of solar exposure climate colour fastness testers. It is suitable for sun exposure instruments that simulate sunlight for various Spinning & weaving colour fastness tests, including air-cooled swirl/spin, water-cooled swirl/spin and air-cooled flat plate types. Reliability and standardization of testing instruments are ensured by citing a number of necessary national standards. In the terms and definitions section, the meaning of irradiance is clarified, providing an accurate explanation for the understanding and implementation of the standard.