The illumination source comprises a single illumination source having an output of illumination light (11) transmitted through one or more lenses (42) and focused upon an optical fiber (60) and a dimming mechanism comprising a mount (44) on one or more of said lenses (42) which is capable of steering one or more of said lenses (42) whereby a peak illumination of said illumination light (11) is not centered on said optical fiber (60) during dimming.
