LIGHTING DEVICE FOR EXAMPLE FOR SPOT LIGHTING APPLICATIONS

摘要

A lighting device (20, 40) is disclosed. The lighting device (20, 40) comprises a segmented light guide (19), comprising a plurality of segments (21, 22), where each segment (21, 22) may be ‘pumped’ with light via respective first light in-coupling surfaces located on a lateral surface of the light guide (19), and where each of the segments (21, 22) is configured to convert at least a part of light input therein into light having a selected wavelength range. The light guide (19) extends in an axial direction between a first base surface (25) at one end (23) of the light guide (19) and a second base surface (26) at another end (24) of the light guide (19), the first base surface (25) and the second base surface (26) being located on different ones of the segments (21, 22). At least a portion of the first base surface (25) comprises a second light in-coupling surface for coupling of light into the light guide (19) and at least a portion of the second base surface (26) comprises a light out-coupling surface for coupling of light out of the light guide (19). The lighting device (20, 40) comprises at least one first light-emitting element (29) configured to emit light of a first wavelength range and being optically coupled to the second light in-coupling surface such that light emitted by the at least one first light-emitting element (29) is coupled into the light guide (19) via the second light in-coupling surface, wherein the at least one first light-emitting element (29) is configured so as to reflect at least part of incident light thereon having a wavelength within at least one of the selected wavelength ranges back into the light guide (19).