Patent ID: 8829458

Claim:
A device for artificially weathering or testing the lightfastness of samples, comprising: a weathering chamber, in which an ultraviolet radiation device is arranged and at least one sample can be arranged in a sample plane spaced apart from said ultraviolet radiation device, wherein the ultraviolet radiation device has a plurality of ultraviolet light emitting diodes containing two or more classes of ultraviolet light emitting diodes having different emission bands, wherein the emission bands are chosen in such a way that a spectral distribution with which a specific spectral ultraviolet characteristic is approximated can be obtained in the sample plane, and wherein the ultraviolet light emitting diodes of each one of the emission bands are distributed spatially on a planar area in a point-symmetrical arrangement, the symmetry point being defined by one of the ultraviolet light emitting diodes or a point located in an interspace between the ultra-violet light emitting diodes.