multiple scattering processes of the red light are drastically less probable than in the known solution in principle the coupling out of light in tachometer needles or side illuminated lcd backlights functions in a similar way the novel feature here is the use of a phosphor which is absorption free in the red as possible in the layer 6 as a component used for coupling out suitable here in particular is a green emitting phosphor of the type garnet a3b5012 ce in particular yagag ce which at the same time contains aluminum and gallium primarily suitable as component a is y and or lu advantageously a garnet with the cation a lu is suitable as phosphor for a peak wavelength of the primary radiation in the range 430 to 450 nm in particular up to 445 nm and wherein b at the same time has contents of al and ga in particular contains from 10 to 40 mol of ga in particular from 20 to 30 in component b with the rest being al the carrier element 5 can and should be structured in such a way that the coupling out of light in the red is adjusted in such a way that an emission is achieved which is as homogeneous as possible.