Abstract: There is described a spectral output homogenising apparatus, the apparatus comprising; a plurality of light sources, wherein the plurality of light sources emits a spectral output; a first medium proximate the plurality of light sources, wherein the first medium is arranged to spatially homogenise the spectral output of the plurality of light sources; a second medium adjacent the first medium, wherein the second medium is arranged to angularly homogenise the spectral output of the plurality of light sources; wherein the spectral output of the plurality of light sources traverses the first medium before traversing the second medium. There is further provided use of an apparatus to homogenise the spectral output of a plurality of light sources and a method of homogenising light from a plurality of sources.

Abstract: There is described a spectral output homogenising apparatus, the apparatus comprising; a plurality of light sources, wherein the plurality of light sources emits a spectral output; a first medium proximate the plurality of light sources, wherein the first medium is arranged to spatially homogenise the spectral output of the plurality of light sources; a second medium adjacent the first medium, wherein the second medium is arranged to angularly homogenise the spectral output of the plurality of light sources; wherein the spectral output of the plurality of light sources traverses the first medium before traversing the second medium. There is further provided use of an apparatus to homogenise the spectral output of a plurality of light sources and a method of homogenising light from a plurality of sources.

Abstract: The invention relates to an LED illumination device 1. Device 1 comprises at least two collimating optics 10,20,30,40 adapted to collimate light parallel to an illumination axis 2 through one or more dichroic mirrors 50,60,70, and at least two frames 12,22,32,42 each supporting at least two LED light sources, each frame being adapted to present one LED light source onto the focal axis 13,23,33,43 of one of said collimating optics.