Abstract: A high-pressure gas discharge lamp includes at least a lamp tube and two electrodes. The two electrodes are each attached to the lamp tube by a sealed area and, outside the sealed area, each electrode has a perpendicular minimum distance, with respect to its longitudinal axis, from the lamp tube.

Abstract: A high pressure gas discharge lamp (10) is described with a discharge vessel (20). Electrodes (24) project into a discharge space (22) surrounded by a discharge vessel wall (30) of quartz material. The discharge space has a filling of rare gas and a metal halide composition which is free of mercury. The metal halide composition comprises at least halides of Sodium and Scandium with a mass ratio of halides of Sodium and Scandium of 0.9-1.5. In order to provide a lamp that can be easily manufactured and is well suited for operation at reduced power, the discharge vessel wall (30) is of externally and internally cylindrical shape. The lamp may be manufactured by providing a cylindrical tube (2) of quartz material, heating the tube (2) at least two distant portions and forming grooves (4) there, inserting two electrodes (24) into the tube and heating and pinching the tube (2) at both ends to seal the discharge space (22).

Abstract: A high-intensity discharge (HID) lamp comprising an inner bulb (1) with a discharge vessel (11) and an outer bulb (2), especially for application in an automotive headlight unit is disclosed. A lamp design is proposed by which high thermal stresses and increased quartz temperatures during run-up and steady state operation of the lamp are avoided so that the light output and the lifetime of the lamp is improved. This is substantially achieved by a positioning of the inner and the outer bulb (1, 2) such that a longitudinal axis of the inner bulb (1) is displaced in the operating position of the lamp above a longitudinal axis of the outer bulb (2) so that the distance between the discharge vessel (11) and the outer bulb (2) at the top side of the lamp is decreased and the distance between both at the bottom side is correspondingly increased.

Abstract: A high pressure gas discharge lamp 10 is described with a discharge vessel 20. Electrodes 24 project into a discharge space 22 of a volume of 12-20 mm3. The discharge space has a filling of rare gas and a metal halide composition which is free of mercury. The metal halide composition comprises at least halides of Sodium and Scandium with a mass ratio of halides of Sodium and Scandium of 0.9-1.5. The lamp 10 further comprises an outer enclosure 18 provided around the discharge vessel 20, which is sealed and filled with a gas at a pressure below 1 bar. The lamp 10 has an efficiency equal to or greater than 90 lm/W in a steady state operation at an electrical power of 25 W.

Abstract: An electrode includes thorium as a minor component for a high-pressure discharge lamp, where the electrode rod is free of thorium/thorium oxide, or comprises thorium/thorium oxide, as a minor constituent. A covering member made of refractory metal, free of thorium/thorium oxide, is circumference coated on the electrode rod in the vicinity of the discharge side tip. The entire surface of the electrode rod is completely coated over the range where the covering member extends. The electrode rod tip of the electrode rod is not, or at least partly, coated with the covering member. The part of the electrode tip, which is not coated by the covering member, is free of thorium/thorium oxide.

Abstract: A high-pressure gas discharge lamp 10 is described with a sealed discharge vessel 20 with an inner discharge space 22. Two electrodes 24 project into the discharge space 22. The filling in the discharge space 22 comprises metal halides and a rare gas. In order to provide a lamp with good environmental properties suited for automotive use, in particular with good lumen maintenance, the filling is free of Hg and Th and comprises halides in an amount of 7.1-11.4 ?g/mm3 of the volume of the discharge space 22. The halides comprise at least NaI and ScI3, provided in such amounts that a ratio of the masses of NaI to ScI3 is 1.2-1.6.

Abstract: The lamp, particularly the high pressure discharge lamp, comprises a socket (10) made of an insulating material, a burner (12) for emitting light mechanically connected to the socket, and a backlead wire (14) connected to the burner (12), wherein the socket (10) comprises a color with a weighted absorption of <50% and/or a ceramic dielectric (16) arranged around the backlead wire (14) is provided, wherein the ceramic dielectric (16) comprises a color with a weighted absorption of <50%. By using colors for the socket (10) and/or the ceramic dielectric (16) with a low absorption it is possible to increase the luminous flux of the lamp significantly without increasing the power of the lamp.

Abstract: A mercury-free gas discharge lamp suitable in particular for motor vehicles has an enhanced discharge arc diffuseness. The lamp according includes an inner vessel and/or outer bulb with a structured arrangement or pattern such that the discharge arc diffuseness of the lamp is increased, such as by 0.01 mm to 1.5 mm.

Abstract: In order to achieve a discharge lamp suited to operate under reduced nominal power of e.g. 20-30 W, a lamp is proposed with two electrodes (24) arranged at a distance in a discharge vessel (20, 120) for generating an arc discharge. The discharge vessel (20, 120) has a filling with a substantially free of mercury and comprises a metal halide and a rare gas. The lamp (10, 110) further comprises an outer bulb (18) arranged around the discharge vessel at a distance (d2). The outer bulb (18) is sealed and has a gas filling of a thermal conductivity (?). The inner diameter (d1) of the discharge vessel is preferably in a range from 2-2.7 mm. The wall thickness (w1) is in a range from 1.4-2 mm. A heat transition coefficient (?/d2) is calculated as thermal conductivity (?) at 800° C. of the outer bulb filling divided by the distance (d2). The so-defined heat 10 transition coefficient is below 150 W/(m2K).

Abstract: The invention describes a mercury-free high intensity gas-discharge lamp (1) with nominal power in the range of 25 W to 40 W, and in particular with nominal power of 35 W, comprising a quartz glass discharge chamber (2) enclosing a fill gas and comprising a pair of electrodes (3, 4) arranged at opposing ends of the discharge chamber (2) and extending into the discharge chamber (2), for which lamp (1) the capacity of the discharge chamber (2) is greater than or equal to 17 ?l and less than or equal to 25 ?l; the inner diameter of the discharge chamber (2) is at least 2.3 mm and at most 2.5 mm; the outer diameter of the discharge chamber (2) is at least 5.95 mm and at most 6.15 mm; the thickness of the discharge chamber (2) is at least 3.45 mm and at most 3.85 mm.

Abstract: A lamp, containing ?100 ppm Hg, includes a burner chamber having an axis, the axis having a section ?0.05 mm. The burner chamber has a recess oriented toward a light arc produced in the burning chamber to suppress arc curvature. The lamp has an arc-luminescence profile of luminescence (measured in cd/m2)/mm with an average slope over that section which is ?|300,000,000| (cd/m2)/mm. Preferably, the profile maximum value is ?90,000,000 cd/m2. In one embodiment, the arc-making device includes two electrodes disposed for producing the light arc across their two tips, the depth of the recess being sufficiently small so as not to extend between the two tips.

Abstract: The invention relates to a high-pressure gas discharge lamp which comprises at least a lamp tube (1) and two electrodes (41, 42), wherein the two electrodes (41, 42) are each attached to the lamp tube (1) by a sealed area and, outside the sealed area, each electrode has a perpendicular minimum distance, with respect to its longitudinal axis, from the lamp tube (1).

Abstract: The invention describes a light burner (1) comprising a discharge chamber (2) containing a gas sealed in the discharge chamber (2) by a seal (4, 5) and a pair of electrode shafts (6, 7), each of which partially intrudes from the seal (4, 5) into the discharge chamber (2) whereby a wrapping (8, 9), at least partially contained in the seal (4, 5), is freely wound around at least one of the electrode shafts (6, 7) and constrained in its motion by a number of containment elements (P1, P2, P3, P4) positioned along the longitudinal axis of the electrode shaft (6, 7).

Abstract: An optical waveguide system has a discharge lamp with a reflector and an asymmetrical burner. The reflector has a reflecting surface and a hollow reflector neck. The asymmetrical burner is partly arranged in the hollow reflector neck, without making contact with it. The shape and the size of the inner contour of the reflecting surface of the reflector corresponds substantially to the contour of the asymmetrical burner, and the asymmetrical burner is centrally located in the reflector.

Abstract: A high-intensity discharge (HID) lamp comprising an inner bulb (1) with a discharge vessel (11) and an outer bulb (2), especially for application in an automotive headlight unit is disclosed. A lamp design is proposed by which high thermal stresses and increased quartz temperatures during run-up and steady state operation of the lamp are avoided so that the light output and the lifetime of the lamp is improved. This is substantially achieved by a positioning of the inner and the outer bulb (1, 2) such that a longitudinal axis of the inner bulb (1) is displaced in the operating position of the lamp above a longitudinal axis of the outer bulb (2) so that the distance between the discharge vessel (11) and the outer bulb (2) at the top side of the lamp is decreased and the distance between both at the bottom side is correspondingly increased.

Abstract: A high-pressure gas discharge lamp (HID [high intensity discharge] lamp) is described which is in particular free from mercury and suitable for use in automobile technology. The lamp is remarkable in particular for a discharge space (2) which has a volume which is reduced by a given factor in comparison with the volume of the discharge space of known mercury-containing discharge lamps. The quantity of the light-generating substances in the discharge space (2) is reduced by the same factor in the simplest case, or even more strongly. This avoids the risk of an impairment of the imaging properties of the lamp because of non-evaporated light-generating substances which may shade off a portion of the luminous discharge arc (21) and/or the tips of the electrodes (3).

Abstract: The invention relates to a discharge lamp with a reflector (1) and a burner (2), wherein the reflector (1) comprises at least a reflective contour (3) and a hollow reflector neck (4), the burner (2) is arranged in centered manner in the reflector (1) and the reflector (1) and the lower part (2.1) of the burner (2) are connected firmly together by a mechanical fastening unit and, during assembly, the burner (2) may be guided through the reflector neck (4), starting with its upper part (2.2), and the mechanical fastening unit exhibits such play in the x, y and z directions that the burner (2) can be brought into a defined position relative to the reflector during assembly.

Abstract: The invention relates to a Hg-free Lamp, whereby the lamp has an arcluminescence profile of Luminescence (measured in cd/m2)/mm with at least one section, in which said at least section is at least ?0.05 mm and ?0.5 mm, and the slope in Luminescence/mm for said at least one section is ?1300.000.0001 (cd/m2)/mm.

Abstract: The present invention relates to an electrode comprising thorium as a minor component for a high-pressure discharge lamp, a high-pressure discharge lamp, and a method of manufacturing therefore.

Abstract: The invention describes a light burner (1) comprising a discharge chamber (2) containing a gas sealed in the discharge chamber (2) by a seal (4, 5) and a pair of electrode shafts (6, 7), each of which partially intrudes from the seal (4, 5) into the discharge chamber (2) whereby a wrapping (8, 9), at least partially contained in the seal (4, 5), is freely wound around at least one of the electrode shafts (6, 7) and constrained in its motion by a number of containment elements (P1, P2, P3, P4) positioned along the longitudinal axis of the electrode shaft (6, 7).