Patent ID: 7427731

Claim:
An illumination unit comprising a high-power light source ( 1 ), a first optical element ( 12 ) for focusing the light emitted from the high-power light source ( 1 ), a photometric head ( 8 ) for illuminating an object ( 3 ) with a predefined brightness value, an optical waveguide ( 2 ) for transmitting the emitted and focused light to the photometric head ( 8 ), a displacement unit ( 6 ) for varying the axial distance between the high-power light source ( 1 ) with the first optical element ( 12 ) and the inlet of the optical waveguide, wherein the cross-sectional surface of the focal point is at least twice as large as the cross-sectional surface of the optical waveguide ( 2 ) on the light inlet side, and the intensity of the light coupled into the optical waveguide ( 2 ) can be varied by axial displacement of the high-power light source ( 1 ).