This standard is one of the series of methods for testing the color fastness of textiles. It specifies a test method for determining the resistance of various textile colors to artificial light using a xenon arc lamp to simulate daylight (D65 illuminant). The core principle involves exposing the sample and blue wool reference materials with known light sensitivity together in a xenon arc lamp testing chamber. The color fastness to light of the textile is then assessed by comparing the degree of color change between the sample and the reference materials after irradiation. The key instrument required for this test is the xenon arc lamp light fastness tester, which can simulate and control test conditions such as light exposure, temperature, and humidity. The rating process must be conducted under a standard light source cabinet using a grayscale for color change. This standard is modified from an international standard, ensuring international comparability of the test results.