The ASTM G151-2019 standard guides the procedure for exposure testing of Non-metallic materials under laboratory Light sources. The main significance of this standard is to evaluate the performance changes and failure modes of materials in the actual use environment through accelerated testing. It is important to note, however, that accelerated test results under laboratory conditions are not a direct representation of how materials will behave under actual use conditions, due to differences in factors such as Light spectrum, temperature, Humidity, etc. between laboratory and natural environments. The standard emphasizes the limitations of using Acceleration coefficients for time acceleration calculations and provides practical recommendations for testing using laboratory Light sources, such as comparing the relative performance of materials and determining the conformity of operating conditions. In addition, detailed information on equipment performance requirements and data interpretation is provided, as well as guidance on how to apply statistical methods to analyze test results.