An arrangement comprising a device, wherein the device comprises a luminescent material comprising element and a light transmissive element, wherein: - the device has a first device axis; - the luminescent material comprising element comprises a luminescent material configured to emit luminescent material light upon irradiation with first light, wherein the luminescent material comprising element has a first length and a characteristic first dimension perpendicular to the first length, wherein D1/L1<1; wherein the luminescent material comprising element is configured at a non-zero first distance from the first device axis, and wherein the luminescent material comprising element at least partly surrounds the first device axis; - the light transmissive element is transmissive for the first light, wherein the light transmissive element comprises an element light entrance part and an element light escape part, wherein the element light escape part and the luminescent material are radiationally coupled; wherein one or more of the following applies: (i) the first device axis intersects the light transmissive element, and (ii) the light transmissive element at least partly surrounds the first device axis; and - the luminescent material comprising element is in thermal contact with one or more of (a) the light transmissive element and (b) an optional thermally conductive element, - characterised in that the light transmissive element comprises a dome-shaped body having a curved surface, wherein at least part of the curved surface comprises the element light entrance part, wherein the light transmissive element has a transmissive element axis, wherein the first device axis and the transmissive element axis coincide. - the device has a first device axis; - the luminescent material comprising element comprises a luminescent material configured to emit luminescent material light upon irradiation with first light, wherein the luminescent material comprising element has a first length and a characteristic first dimension perpendicular to the first length, wherein D1/L1<1; wherein the luminescent material comprising element is configured at a non-zero first distance from the first device axis, and wherein the luminescent material comprising element at least partly surrounds the first device axis; - the light transmissive element is transmissive for the first light, wherein the light transmissive element comprises an element light entrance part and an element light escape part, wherein the element light escape part and the luminescent material are radiationally coupled; wherein one or more of the following applies: (i) the first device axis intersects the light transmissive element, and (ii) the light transmissive element at least partly surrounds the first device axis; and - the luminescent material comprising element is in thermal contact with one or more of (a) the light transmissive element and (b) an optional thermally conductive element, - characterised in that the light transmissive element comprises a dome-shaped body having a curved surface, wherein at least part of the curved surface comprises the element light entrance part, wherein the light transmissive element has a transmissive element axis, wherein the first device axis and the transmissive element axis coincide.