A radiation device comprises: a housing comprising: a base portion; a head portion connected to the base portion; a radiation emission window in the head portion; a radiation source arranged in the region of the base portion in the interior of the housing for emitting electromagnetic radiation, the radiation source having an emission intensity maximum at a wavelength in the range from 350 to 600 nm; and a mirror arranged in the region of the head portion in the interior of the housing. A radiation path extends between the radiation source and the mirror. Electromagnetic radiation emitted by the radiation source arrives at the mirror via the radiation path. The electromagnetic radiation arriving at the mirror via the radiation path is reflected by the mirror, such that the reflected electromagnetic radiation exits the housing through the radiation emission window.