Abstract: The invention is related to high pressure sodium lamp having a nominal power Pla. The lamp, which is designed to be operated at a very high frequency (VHF), has a discharge tube with a ceramic wall and an internal vessel diameter Dint, which encloses a discharge space in which a pair of electrodes at a mutual electrode distance ed and a filling of Na-amalgam with a sodium mol fraction (smf). According to the invention the discharge tube has a ratio ed/Dint of at most 7, preferably between about 5.5 and 4.0.

Abstract: Vehicle headlamp provided with a metal halide lamp comprising a discharge vessel surrounded by an outer envelope with clearance and having a ceramic or quartz wall which encloses a discharge space containing Xenon (Xe) and a filling of ionizable particles, wherein in said discharge space two electrodes are arranged whose tips have a mutual interspacing so as to define a discharge path between them, with the special feature that said headlamp comprises means to vary the spatial distribution of the ionizable particles inside the discharge vessel, such that said spatial distribution changes along the axis of the metal halide lamp in the horizontal orientation of the metal halide lamp.

Abstract: Metal halide lamp suitable as projection lamp, for instance as a vehicle headlamp comprising a discharge vessel surrounded by an outer envelope with clearance and having a ceramic wall which encloses a discharge space filled with a filling comprising an inert gas, such as xenon (Xe), and an ionizable salt, wherein in said discharge space two electrodes are arranged whose tips have a mutual interspacing so as to define a discharge path between them, with the special feature that said ionizable salt comprises NaI, TlI, CaI2 and XI3 wherein X is selected from the group comprising rare earth metals.

Abstract: The present invention relates to a metal halide burner with ceramnic discharge vessel, a lamp with said burner, and a method for manufacturing said burner with one discharge vessel having two end parts (2a, 2b) each with one end opening (3a, 3b), a filling (8), two end closure constructions (4a, 4b) for closing said end openings (3a, 3b), and crevices (7a, 7b) between the end openings (3a, 3b) and the end closure constructions (4a, 4b), wherein the first end closure construction (4a) differs from said second end closure construction (4b) in at least shape, type of material of the components and/or arrangement of components; and/or the shape of said first crevice (7a) differs from the shape of said second crevice (7b); and/or the first end part (2a) differs from the second end part (2b) in shape, type of material of one component, and/or the arrangement of components; so that an asymmetric ceramic metal halide burner is achieved.

Abstract: A metal halide lamp is disclosed comprising an elongated discharge vessel, preferably made of a ceramic material, surrounded by an outer envelope and having a wall which encloses a discharge space containing an inert gas, such as xenon, and an ionizable filling, wherein at both ends in said discharge space an electrode is arranged between which a discharge arc can be maintained along a discharge path, wherein one end of the discharge vessel is mounted in a mounting base, said lamp comprising a band-shaped light-shielding strip extending laterally of the discharge path, and a lead-back conductor supplying current from the mounting base to the electrode at the other end of the discharge vessel, wherein, seen in cross section, the lead-back conductor is positioned within the sector defined by the two lines through the center of the discharge vessel and the edges of said strip.

Abstract: A discharge lamp comprising an elongated discharge vessel, preferably made of a ceramic material, surrounded by an outer envelope and having a wall which encloses a discharge space containing an inert gas and an ionizable filling, wherein at both ends in said discharge space an electrode is arranged between which a discharge arc can be maintained along a discharge path, wherein one end of the discharge vessel is mounted in a mounting base, said lamp comprising a lead-back conductor supplying current from the mounting base to the electrode at the other end of the discharge vessel, characterized in that the lead-back conductor extends through the length of the wall of the outer envelope.

Abstract: A lamp (1, 11, 14, 17) for a motor vehicle headlight is described. The lamp (1, 11, 14, 17) comprises a bulb (3) surrounding a light source (4) and a lamp base (2) arranged at an end of the bulb (3) and serving to support the lamp (1, 11, 14, 17) inside a reflector (20) of the headlight. At least one lens structure (7, 12, 15, 18) is present in or at an upper side (O) and/or lower side (U) of the bulb (3). This lens structure (6, 12, 15, 18) is constructed such that at least a portion of the light radiated by the light source (4) in the direction of a region of the reflector (20) close to the lamp base is redirected into a region of the reflector lying farther to the front.

Abstract: The present invention relates to a ceramic gas tight high-pressure burner (1) comprising an ionisable filling, a method of manufacturing said ceramic gas tight high-pressure burner (1), and a lamp comprising said ceramic gas tight high-pressure burner (1), whereby said ceramic gas tight high-pressure burner (1) comprises a discharge vessel (2) having a discharge cavity (3) with a C)volume in the range of 3 mm3 to 30 mm3, and an internal filling pressure of the discharge cavity (3) in the range from 0.1 MPa to 4 MPa at room temperature. Furthermore the present invention relates to an end closure construction designed as a three-part, a two-part or a one-part end closure device (4) with a reduced crevice (11).

Abstract: A Hg-free metal halide lamp comprising a substantially cylindrical discharge vessel with a ceramic wall having an internal diameter Di, an internal length Li and a wall thickness Wt, and filled with an ionizable filling, wherein two electrodes are present having a mutual distance EA for maintaining a discharge in the discharge vessel, wherein the filling comprises an inert gas and a salt, wherein the internal length Li is smaller than 8 mm, wherein the electrode distance EA and the internal diameter Di comply with the relation EA/Di>;2, wherein the inert gas pressure PXe at room temperature is at least 5 bar, and wherein the wall thickness Wt and the internal diameter Di comply with the relation Wt/Di>0.15.