Light source

A light source, for emitting collimated or focused light, the light source comprising:

• at least one primary light source and a conversion body (1) formed at least in part of a single crystal phosphor material for converting primary light to secondary light, wherein the single crystal phosphor material has on its surface an incident surface (2) for primary light and an exit surface (3) of the secondary light, wherein the remaining surface of the single crystal phosphor material except the incident surface (2) and the exit surface (3) forms a shaped reflective interface for directing the light by reflection inside the conversion body (1) towards the exit surface (3) wherein the conversion body (1) has a shape of a spatially extending object with an extension in the direction from the incident surface (2) to the exit surface (3) so that the incident surface (2) and the exit surface (3) are spaced apart from each other, wherein the area of the incident surface (2) is less than the area of the exit surface (3), and wherein the single crystal phosphor material is adapted for full conversion of blue primary light into the secondary light with broad spectrum green to yellow light with wavelengths in a range between 470 and 680 nanometers.