Patent ID: 11371662

Abstract:
The invention provides a light generating device (1000) comprising:—a light source (100) comprising a light emitting surface (110), wherein the light source (100) is configured to generate light source light (101), wherein the light emitting surface (110) is configured in a light chamber (200);—the light chamber (200), wherein the light chamber (200) is at least partly defined by a chamber wall (210), wherein the chamber wall (210) comprises: (i) a first part (211), wherein the first part (211) is transmissive for the light source light (101), wherein the first part (211) has a first reflectance R1 for the light source light (101), and wherein the first part (211) has a first part area (A1); and (ii) one or more second parts (212), wherein each second part (212) is transmissive for the light source light (101), has a second reflectance R2 for the light source light (101), and wherein the one or more second parts (212) together have a second part area (A2), wherein R1−R2≥20%, wherein 65%≤R1<100%, and wherein the second part area (A2) is smaller than the first part area (A1).