The DHT® Automotive Lamp Fogging Test Chamber is specifically designed to simulate the anti-fog performance of automotive lighting systems under real-world environmental conditions. Featuring a dual-temperature zone configuration, both chambers are walk-in accessible. The left chamber replicates the external environment of the headlamp, incorporating functions such as cold water rainfall simulation, constant temperature and humidity control, wind speed adjustment, and front-facing illumination. The right chamber simulates the rear environment of the headlamp, providing high and low-temperature cycling, constant temperature and humidity control, and wind speed adjustment. The central area is designated for installing the test samples. This test chamber enables rapid evaluation of headlamp anti-fog performance under various environmental conditions, assisting users in optimizing product designs to ensure reliability and safety across diverse weather scenarios.