Abstract: The illumination system has a plurality of light emitters (R, G, B) and a light collimator (1) for collimating light emitted by the light emitters. Light propagation in the light-collimator is based on total internal reflection (TIR) towards a light-exit window (4) of the light-collimator. At least one light sensor (8) for optical feedback is placed outside the light-collimator and is arranged to receive light emitted by the light emitters exclusively through reflection at the light-exit window of the light-collimator. Preferably, the light sensor is placed substantially coplanar with the light emitters. Preferably, a side wall (35) of the light-collimator is provided with a protruding portion (9) for guiding the light reflected at the light-exit window of the light-collimator towards the light sensor. Preferably, the illumination system is provided with a reflector (12). Preferably, the illumination system comprises a holographic diffuser (17).

Abstract: An illumination system has a plurality of light emitters (R, G, B), at least one light-collimating section (12, 12?, 12?) for collimating the light emitted by the light emitters arranged along a longitudinal axis (25) of the illumination system. The at least one lightcollimating sections merge into a light-mixing section (3) at a side facing away from the light emitters. The light-mixing section has a plurality of side-faces parallel to the longitudinal axis. A surface of the light-mixing section facing away from the light emitters is provided with a light-shaping diffuser (17). Preferably, the light-shaping diffuser is a holographic diffuser. Preferably, the illumination system comprises a plurality of light-collimating sections each of the light-collimating sections being associated with at least one light emitter. The illumination system provides improved spatial and spatio-angular mixing of the light emitted by the light emitters.

Abstract: The illumination system has a light source (1) with a plurality of light emitters (R, G, B). The light emitters comprise at least a first light-emitting diode of a first primary color and at least a second light-emitting diode of a second primary color, the first and the second primary colors being distinct from each other. The illumination system has a facetted light-collimator (2) for collimating light emitted by the light emitters. The facetted light-collimator is arranged along a longitudinal axis (25) of the illumination system. Light propagation in the facetted light-collimator is based on total internal reflection or on reflection at a reflective coating provided on the facets of the facetted light-collimator. The facetted light-collimator merges into a facetted light-reflector (3) at a side facing away from the light source. The illumination system further comprises a light-shaping diffuser (17). The illumination system emits light with a uniform spatial and spatio-angular color distribution.

Abstract: An illumination system has a plurality (2) of light-collimating sections (12, 12?, 12?) and a light-mixing section (3). The light-collimating sections are arranged substantially parallel to each other along a longitudinal axis (25) of the illumination system. Each of the light-collimating sections is associated with at least one light emitter (R, G, B). Each of the light emitters is being in optical contact with the respective light-collimating section via a dielectric material with a refractive index larger than or equal to 1.3. At a side facing away from the light emitters, the light-collimating sections merge into the light-mixing, the light-collimating sections and the light-mixing section forming one integral part. Light propagation in the light-mixing section is based on total internal reflection and the light-mixing section has a plurality of faces parallel to the longitudinal axis.

Abstract: A light-guiding system comprising a plate-like light-emitting element (20) provided with means for emitting light through at least part of its front surface (22). Light is coupled in by a plate-like light-guiding member (21) connected to a lateral side of said lightemitting element (20). One or more interstices (25) are present between said light-emitting element (20) and said light-guiding member (21).

Abstract: The invention relates to a metal halide lamp for a vehicle headlamp comprising a cylindrically-shaped discharge vessel (23) having a ceramic wall which encloses a discharge space comprising Xe and ionizable filling, and a cylindrically-shaped outer bulb (21) surrounding the discharge vessel (23). According to the invention a portion (25, 26) of the surface of the outer bulb (21) facing away from the discharge vessel (23) is shaped as a negative lens. Preferably, the portion (25, 26) encompasses a segment of the outer bulb (21) with a segment angle ? in the range between 30???60°. Preferably, the portion (25) forming the negative lens is shaped as a flat surface.

Abstract: A color-mixing lighting system has a light-emitting diode (6, 7) emitting first visible light having a first peak wave-length in a first spectral range and has a fluorescent material (8) converting a portion of the first visible light into second visible light having a second peak wavelength in a second spectral range. The second visible light has a full width at half maximum (FWHM) of at least 50 nm. Preferably, the second visible light is red light, the second peak wavelength being in the range from 590 to 630 ran, preferably, in the range from 600 to 615 nm. Preferably, the lighting system comprises a further light-emitting diode (7) for emitting third visible light having a third peak wavelength in a third spectral range. The color-mixing lighting system according to the invention generates white light with a high color-rendering index and allows certain variations in the wavelength of the primaries.

Abstract: A light-guiding system comprising a plate-like light-guiding element (20) having a substantially flat lateral surface and means for coupling in light through said lateral surface. Said means comprise a light-guiding member (1,21) substantially having a flat platelike and triangular shape, wherein a shorter side (2) comprises light-coupling means (5) for coupling in light into said light-guiding member (1,21). A longer side of the triangle comprises a coupling-out surface (7) which faces said lateral surface for coupling in light into said light-guiding element (20). The third side (8) of the triangle comprises a number of surfaces (10) that are positioned at an angle to the direction of said third side (8).

Abstract: A light-guiding system comprising a plate-like light-guiding member (1) provided with a lateral surface for coupling in light into said light-guiding member (1). The ends of a number of light transmission rods (6) are connected to said lateral surface, while said light-guiding member (1) and said light transmission rods (6) are one piece of the same material.

Abstract: Vehicle headlamp with a metal halide lamp comprising: a discharge vessel surrounded with clearance by an outer envelope and having a ceramic wall which encloses a discharge space containing Xenon (Xe) and an ionizable filling; a first and a second current conductor entering the discharge vessel and each supporting an electrode in the discharge vessel, wherein the first and the second current conductor each extend from a ceramic sealing compound sealing the discharge vessel around the current conductors in a gastight manner to the exterior of the discharge vessel, and wherein the discharge vessel has extended end parts in each of which a respective current conductor is enclosed, which plugs each have a free end where the discharge vessel is sealed by the ceramic sealing compound; with the special feature that said vehicle headlamp has a lightreflective coating surrounding at least a portion of at least one of the end parts.

Abstract: Vehicle headlamp provided with a metal halide lamp comprising a discharge vessel surrounded with clearance by an outer envelope and having a ceramic wall which encloses a discharge space containing xenon (Xe) and an ionizable filling, wherein in said discharge space two electrodes are arranged whose tips have a mutual interspacing EA so as to define a discharge path between them, wherein the discharge vessel has an internal diameter Di at least over the distance EA, and wherein Di is smaller than or equal to 2 mm and the relation EA/Di is smaller than 6, with the special feature that said vehicle headlamp has not more than one band-shaped light-absorbing coating laterally of the discharge path.

Abstract: The invention relates to a road illumination system for forming a low beam in traffic applications comprising a light source and a reflecting surface formed by a multiplicity of reflector segments arranged around a central optical axis. According to the invention, the light source emits light over an angle of at most 180° in a direction facing away from the intersection of the central optical axis and the reflecting surface and the reflector segments are parabolically-shaped and have a segment optical axis parallel to the central optical axis, while the reflector segments are positioned such that the segment optical axis substantially intersects with an edge of the light source. Preferably, the illumination system is provided on poles (5, 5?, . . . ) or on a crash barrier adjacent the traffic lanes 1. Alternatively, the illumination system is a vehicle headlamp. Preferably, the light source (13) is a (white) lightemitting diode.

Abstract: An electric lamp (1) comprising an elliptical reflector body (3) with a light emission window (5) and with a light-transmitting cover (11) positioned in the light emission window. A light chamber (7) is defined by the reflector body, in which chamber a light source (13) is positioned in a first focus (F1) of the reflector body. A second focus (F2) of the reflector body is located outside the light chamber and at an end (19) of an optical waveguide (17). The cover is provided with IR-reflecting means (15) and is parabolically or elliptically shaped, the cover having a focus (Flid) which is located on the light source.