The light fastness testing machine is designed to assess the color fastness to light, weather, perspiration and alternate dark/light cycle, and it is applicable for a broad range of materials, such as textile, leather, rubber, plastic, paint, coating, auto interior, petrochemical products and so on. More specifically, this light fastness tester exposes specimens to sunlight, rain, mist, temperature change, humidity change and other simulated weather conditions to see their performance.