LIGHTING DEVICE WITH CERAMIC GARNET

摘要

The invention provides a lighting device (1) comprising a plurality of solid state light sources (10) and an elongated ceramic body (100) having a first face (141) and a second face (142) defining a length (L) of the elongated ceramic body (100), the elongated ceramic body (100) comprising one or more radiation input faces (111) and a radiation exit window (112), wherein the second face (142) comprises said radiation exit window (112), wherein the plurality of solid state light sources (10) are configured to provide blue light source light (11) to the one or more radiation input faces (111) and are configured to provide to at least one of the radiation input faces (111) a photon flux of at least 1.0* 1017 photons/(s.mm2), wherein the elongated ceramic body (100) comprises a ceramic material (120) configured to wavelength convert at least part of the blue light source light (11) into at least converter light (101, wherein the ceramic material (120) comprises an A3B5O12:Ce3 + ceramic material, wherein A comprises one or more of yttrium (Y), gadolinium (Gd) and lutetium (Lu), and wherein B comprises aluminum (Al).