Led light system

A light system based on at least one first and one second group of solid-state light sources, wherein a first device that at least partly converts the radiation of at least one first group is disposed in front of said group or each representative of said group or at least one portion of said first group, wherein the first device comprises a phosphor-containing layer as a converter, which layer converts at least one portion of the primary radiation of the first group into secondary radiation having a longer wavelength, wherein the second group emits radiation having a greater wavelength than that of the first group, a second device that at least partly converting the primary radiation of the first group is present, said second device being disposed in front of at least one portion of the first group, wherein said converter exhibits a temperature dependence of the conversion, which is based on a different temperature dependence of the refractive index of a phosphor and of a matrix embedding the phosphor, and wherein phosphor and matrix are chosen such that at room temperature a difference in the refractive index is small and at operating temperature the difference in the refractive index is at least 1.5 times the magnitude of that at room temperature.