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: Disclosed herein is a light source apparatus for providing an adjustable number of wavelength channels. The light source apparatus comprises at least a first plurality of LED modules, each LED module comprising an LED, a housing which at least partially encloses the LED, and a light director attachable to said housing for directing light emitted by the LED. The first plurality of LED modules are attached to a support structure in a first arrangement via attachment means. In the first arrangement, light emitted by each LED of the first plurality of LEDs is directed along a first optical axis. At least one LED module of the first plurality of LED modules is a removable LED module, and the attachment means is configured to allow the removal and re-attachment of the removable LED module to and from the first arrangement.