A luminous means comprising a substrate having a first main surface, to which a first electrode is applied, a second electrode, an organic layer stack within an active region of the substrate between the first and the second electrode, wherein the organic layer stack comprises at least one organic layer which is suitable for generating light, and at least one reflective element, which is formed along a main plane of the luminous means, wherein the luminous means has two operating states, such that the luminous means is an illumination source in a first operating state and the luminous means is a mirror in a second operating state.