Light source device for endoscopic or exoscopic applications, comprising: a planar first light source for generating light; a second light source for generating light; an illumination beam path (73, 50; 96; 26) configured to provide a first beam of light emanating from the first light source for endoscopic or exoscopic application; a coupling means (82, 91; 92; 94, 95; 97) for coupling a second light beam from the second light source into the illumination beam path (73, 50; 96; 26), wherein the coupling means (82, 91; 92; 94, 95; 97) is configured in such a way that, at the coupling site, the cross-sectional area of the second light beam is smaller than the cross-sectional area of the first light beam, and that the coupling site is located in the light-emitting surface or in a planar or minimally curved surface which contains the light-emitting surface of the first light source, wherein the first light source either comprises a semiconductor light source with an array of light emitting diodes or an array of other light emitting elements and the coupling site is arranged between light emitting diodes or other light emitting elements of the array, respectively, or the first light source comprises a light emitting diode with an opening, wherein the coupling site is located at the opening, and wherein in each case the coupling means comprises an optical waveguide (82; 97) having a first end and a second end, wherein the first end of the optical waveguide (92; 97) is coupled to the second light source, and wherein the second end of the optical waveguide (92; 97) is located in or adjacent to the light emitting surface of the first light source, or the coupling means comprises at least one of an objective (91; 92), a curved mirror, an optical grating or another imaging means for generating a waist of the second light beam at the edge of the light emitting surface of the first light source or in an opening in the light emitting surface of the first light source. a planar first light source for generating light; a second light source for generating light; an illumination beam path (73, 50; 96; 26) configured to provide a first beam of light emanating from the first light source for endoscopic or exoscopic application; a coupling means (82, 91; 92; 94, 95; 97) for coupling a second light beam from the second light source into the illumination beam path (73, 50; 96; 26), wherein the coupling means (82, 91; 92; 94, 95; 97) is configured in such a way that, at the coupling site, the cross-sectional area of the second light beam is smaller than the cross-sectional area of the first light beam, and that the coupling site is located in the light-emitting surface or in a planar or minimally curved surface which contains the light-emitting surface of the first light source, wherein the first light source either comprises a semiconductor light source with an array of light emitting diodes or an array of other light emitting elements and the coupling site is arranged between light emitting diodes or other light emitting elements of the array, respectively, or the first light source comprises a light emitting diode with an opening, wherein the coupling site is located at the opening, and wherein in each case the coupling means comprises an optical waveguide (82; 97) having a first end and a second end, wherein the first end of the optical waveguide (92; 97) is coupled to the second light source, and wherein the second end of the optical waveguide (92; 97) is located in or adjacent to the light emitting surface of the first light source, or the coupling means comprises at least one of an objective (91; 92), a curved mirror, an optical grating or another imaging means for generating a waist of the second light beam at the edge of the light emitting surface of the first light source or in an opening in the light emitting surface of the first light source.