Exterior aircraft light unit for emitting light of a first wavelength and light of a second wavelength, different from the first wavelength, with corresponding emission characteristics, the exterior aircraft light unit comprising: at least one first light source configured to emit the light of the first wavelength, at least one second light source configured to emit the light of the second wavelength, and a wavelength selective optical element, which wavelength selective optical element is reflective for the light of the first wavelength and transparent for the light of the second wavelength, wherein the at least one first light source, the at least one second light source and the wavelength selective optical element are arranged in such a way that both the light of the first wavelength and the light of the second wavelength hit the wavelength selective optical element, with the light of the first wavelength being reflected by the wavelength selective optical element and the light of the second wavelength being passed through by the wavelength selective optical element, and with the light of the at least one first light source, upon being reflected by the wavelength selective optical element, and the light of the at least one second light source, upon being passed through by the wavelength selective optical element, having corresponding directional characteristics, wherein the at least one first light source and the at least one second light source are positioned on the same side of the wavelength selective optical element, and wherein the exterior aircraft light unit further comprises at least one additional optical element, disposed on a side of the wavelength selective optical element where the at least one first light source and the at least one second light source are not positioned, wherein the wavelength selective optical element is shaped to give the light of the first wavelength the corresponding directional characteristics and wherein the at least one additional optical element is shaped to give the light of the second wavelength the corresponding directional characteristics. at least one first light source configured to emit the light of the first wavelength, at least one second light source configured to emit the light of the second wavelength, and a wavelength selective optical element, which wavelength selective optical element is reflective for the light of the first wavelength and transparent for the light of the second wavelength, wherein the at least one first light source, the at least one second light source and the wavelength selective optical element are arranged in such a way that both the light of the first wavelength and the light of the second wavelength hit the wavelength selective optical element, with the light of the first wavelength being reflected by the wavelength selective optical element and the light of the second wavelength being passed through by the wavelength selective optical element, and with the light of the at least one first light source, upon being reflected by the wavelength selective optical element, and the light of the at least one second light source, upon being passed through by the wavelength selective optical element, having corresponding directional characteristics, wherein the at least one first light source and the at least one second light source are positioned on the same side of the wavelength selective optical element, and wherein the exterior aircraft light unit further comprises at least one additional optical element, disposed on a side of the wavelength selective optical element where the at least one first light source and the at least one second light source are not positioned, wherein the wavelength selective optical element is shaped to give the light of the first wavelength the corresponding directional characteristics and wherein the at least one additional optical element is shaped to give the light of the second wavelength the corresponding directional characteristics.