A photostability test chamber is a climate chamber with light which generates defined light conditions in addition to temperature and humidity. Light climate chambers are used for stability testing to determine the shelf life of products. They are used in different sectors, such as the pharmaceutical, cosmetics, and food industries. Photostability tests examine the influence of temperature, humidity, and exposure to light on a product. The test materials are first stored in a climate chamber under defined conditions for a specified period of time before the shelf life is checked.