Abstract: A sorting or classifying apparatus comprising an illumination device for providing illumination or foreground illumination, the illumination device comprising a reflector (61) which has a reflecting surface (63) providing a reflection envelope, a first light source (70) which is disposed in spaced relation in front of the reflecting surface (63) and provides light of a first spectral output to the reflecting surface (63) for reflection thereby and which first light source (70) comprises a plurality of light elements or incandescent lamps (72), wherein the light elements or lamps (72) are disposed on or near a focal axis (X) of the reflector (61), and a second light source (71) which is disposed in spaced relation in front of the reflecting surface (63) and provides light of a second spectral output, different to the first spectral output to the reflecting surface (63) for reflection thereby and which second light source (71) comprises a plurality of light elements or light-emitting diodes (LEDs) (75) arranged

Abstract: A sorting or classifying apparatus comprising an illumination device for providing illumination or foreground illumination, the illumination device comprising a reflector (61) which has a reflecting surface (63) providing a reflection envelope, a first light source (70) which is disposed in spaced relation in front of the reflecting surface (63) and provides light of a first spectral output to the reflecting surface (63) for reflection thereby and which first light source (70) comprises a plurality of light elements or incandescent lamps (72), wherein the light elements or lamps (72) are disposed on or near a focal axis (X) of the reflector (61), and a second light source (71) which is disposed in spaced relation in front of the reflecting surface (63) and provides light of a second spectral output, different to the first spectral output to the reflecting surface (63) for reflection thereby and which second light source (71) comprises a plurality of light elements or light-emitting diodes (LEDs) (75) arranged

Abstract: A light guide (15) for delivering an illumination, in particular a reference or background illumination, the light guide comprising: a mirror box (21) which defines a mirror cavity (23), which receives a light source (19) therein, and includes an illumination aperture (25) from which an illumination is delivered; a transmissive diffuser (27) which is located at the illumination aperture to render the illumination diffuse; and a shutter member (41) which is movable into the cavity to obstruct the light source and provide for control of the radiance of the delivered illumination, whereby control of the radiance of the delivered illumination is determined by a position of the shutter member in the cavity.

Abstract: A light guide (15) for delivering an illumination, in particular a reference or background illumination, the light guide comprising: a mirror box (21) which defines a mirror cavity (23), which receives a light source (19) therein, and includes an illumination aperture (25) from which an illumination is delivered; a transmissive diffuser (27) which is located at the illumination aperture to render the illumination diffuse; and a shutter member (41) which is movable into the cavity to obstruct the light source and provide for control of the radiance of the delivered illumination, whereby control of the radiance of the delivered illumination is determined by a position of the shutter member in the cavity.