Patent ID: 7488102

Claim:
Apparatus for irradiating targets to change their properties, said apparatus comprising: at least one LED having a predetermined spectral output that is at least in part capable of interacting with a target to effect changes in its properties, said output being emitted from said LED over a predetermined solid angle; a non-imaging concentrator for collecting radiation emitted by said LED and re-emitting substantially all said collected radiation as a beam having a diverging solid angle smaller than said predetermined solid angle over which radiation is emitted by said LED, said non-imaging concentrator having an entrance aperture for receiving radiation emitted by said LED and an exit aperture from which said LED output emerges spatially and spectrally uniform in the near field of said exit aperture, said non-imaging concentrator having a shape that continuously enlarges from said entrance aperture to said exit aperture thereof; and a light guide having an entrance aperture optically coupled to said exit aperture of said non-imaging concentrator for receiving radiation there through and conducting it to an exit aperture thereof from which radiation is emitted to irradiate a target.