With the SUNTEST, it is possible to subject small samples and samples of artificial aging to UV-weathering. The samples are irradiated with high-intensity radiation in a wavelength range of 280 to 800 nm with a high intensity. This stress can be combined with phases of a humidity storage. Thus, investigation into photocuring processes can be carried out by means of controlled control of the radiation intensity and the irradiation time. However, changes in the material, such as discolouration or opacity which affect the properties of the components, can also be caused by photo-induced processes.