This standard is Part 9 of the GB/T 12085 series, "Optics and Photonics – Environmental Test Methods." It primarily specifies the test methods for optical instruments and photonic equipment under combined environmental conditions of solar radiation and natural weathering, aimed at evaluating the product's weather resistance, material aging, and performance stability during long-term outdoor use. The standard simulates the coupled effects of multiple factors, including solar spectrum, temperature, and humidity, and is applicable to environmental adaptability testing for various optical components, lenses, and photoelectric products. Related tests typically employ climate aging test chambers equipped with simulated light sources such as xenon arc lamps or fluorescent ultraviolet lamps to reproduce solar radiation conditions with specific spectral and irradiance characteristics, thereby verifying the product's reliability in actual outdoor environments.