A light generating device comprising a light source and a luminescent element, wherein: - the light source is configured to generate first radiation selected from one or more of UV radiation and visible radiation; wherein the light source comprises a laser light source; - the luminescent element comprises (i) a plurality of element bodies and (ii) a thermally conductive support; wherein the plurality of element bodies comprises a plurality of first bodies and a plurality of second bodies, the plurality of second bodies being different from the plurality of first bodies; - the plurality of first bodies comprise a luminescent material, wherein the luminescent material is configured to convert at least part of the first radiation into luminescent material light; wherein the first bodies have a first thermal conductivity K1; wherein the first bodies are configured in a light receiving relationship with the light source; - the plurality of second bodies are light transmissive for one or more wavelengths of the first radiation and the luminescent material light; wherein the second bodies have a second thermal conductivity K2, wherein K2≥0.2*K1; - the plurality of first bodies and the plurality of second bodies are configured in a 2D arrangement, wherein for the plurality of second bodies applies that they are configured adjacent to different first bodies; and the plurality of first bodies and second bodies are configured in thermal contact with the thermally conductive support, - characterized in that the first bodies have a first attenuation coefficient μ1 at one or more wavelengths of the first radiation, wherein the second bodies have a second attenuation coefficient μ2 at one or more wavelengths of the first radiation, wherein μ2≤0.1*μ1, and wherein the first bodies have a third attenuation coefficient μ3 at one or more wavelengths of the luminescent material light, wherein the second bodies have a fourth attenuation coefficient μ4 at one or more wavelengths of the luminescent material light, wherein 0.01*μ3≤μ4≤2*μ3. - the light source is configured to generate first radiation selected from one or more of UV radiation and visible radiation; wherein the light source comprises a laser light source; - the luminescent element comprises (i) a plurality of element bodies and (ii) a thermally conductive support; wherein the plurality of element bodies comprises a plurality of first bodies and a plurality of second bodies, the plurality of second bodies being different from the plurality of first bodies; - the plurality of first bodies comprise a luminescent material, wherein the luminescent material is configured to convert at least part of the first radiation into luminescent material light; wherein the first bodies have a first thermal conductivity K1; wherein the first bodies are configured in a light receiving relationship with the light source; - the plurality of second bodies are light transmissive for one or more wavelengths of the first radiation and the luminescent material light; wherein the second bodies have a second thermal conductivity K2, wherein K2≥0.2*K1; - the plurality of first bodies and the plurality of second bodies are configured in a 2D arrangement, wherein for the plurality of second bodies applies that they are configured adjacent to different first bodies; and the plurality of first bodies and second bodies are configured in thermal contact with the thermally conductive support, - characterized in that the first bodies have a first attenuation coefficient μ1 at one or more wavelengths of the first radiation, wherein the second bodies have a second attenuation coefficient μ2 at one or more wavelengths of the first radiation, wherein μ2≤0.1*μ1, and wherein the first bodies have a third attenuation coefficient μ3 at one or more wavelengths of the luminescent material light, wherein the second bodies have a fourth attenuation coefficient μ4 at one or more wavelengths of the luminescent material light, wherein 0.01*μ3≤μ4≤2*μ3.