Abstract: In various embodiments, a lighting apparatus is provided. The lighting apparatus includes a primary light generating device configured to generate a primary light beam, a phosphor body configured to at least partly convert the primary light beam into secondary light, and a shell-shaped reflector situated in a primary light path between the primary light generating device and the phosphor body. The reflector has in at least one part of its reflection surface a plurality of grooves which run openly in their longitudinal extent and which are arranged parallel to one another.

Abstract: A phosphor device (1) for converting pump light into converted light comprising: a container (3), wherein phosphor particles (5) are movable by a pressure fluid, and an illumination region (9), configured for an illumination of the phosphor particles (5), which are moved by pressure fluid, using pump light, as a result of which converted light is emitted.

Abstract: An electrode (1) for a high-pressure discharge lamp, having an electrode head (3) and an electrode rod (2), connected to electrode head (3) and defines a longitudinal axis (L). The electrode head (3) comprises a main section (4) on the same side as the electrode rod (2), an intermediate section (5) and an end section (9) on the opposite side from the electrode rod (2). The end surface of the end section (9) of the electrode head (3) is formed at least approximately semicircularly, and at least one subsection of the intermediate section (5) is cylindrically shaped. The extent (D2) of the cylindrical subsection of the intermediate section (5) in at least one direction perpendicular to the longitudinal axis is greater than the diameter (D3) of the semicircular end surface of the end section (9), but less than the largest transverse extent (D1) of the main section.

Abstract: A phosphor body (1) for converting pump light into converted light, the extent of said phosphor body being greater in a direction of extent (3) than in a direction perpendicular thereto, and which phosphor body is adapted to emit converted light in the direction of extent (3) as a result of illumination with pump light. The phosphor body (1) comprises at least two phosphor body subvolumes (2a,b,c,d), which are configured in such a way that the converted light emitted in each case by said phosphor body subvolumes differs in terms of the spectral properties. The phosphor body subvolumes are arranged successively in a direction oriented perpendicular to the direction of extent.

Abstract: A phosphor device (1) for converting pump light into converted light comprising: a container (3), wherein phosphor particles (5) are movable by a pressure fluid, and an illumination region (9), configured for an illumination of the phosphor particles (5), which are moved by pressure fluid, using pump light, as a result of which converted light is emitted.

Abstract: An electrode (1) for a high-pressure discharge lamp, having an electrode head (3) and an electrode rod (2), connected to electrode head (3) and defines a longitudinal axis (L). The electrode head (3) comprises a main section (4) on the same side as the electrode rod (2), an intermediate section (5) and an end section (9) on the opposite side from the electrode rod (2). The end surface of the end section (9) of the electrode head (3) is formed at least approximately semicircularly, and at least one subsection of the intermediate section (5) is cylindrically shaped. The extent (D2) of the cylindrical subsection of the intermediate section (5) in at least one direction perpendicular to the longitudinal axis is greater than the diameter (D3) of the semicircular end surface of the end section (9), but less than the largest transverse extent (D1) of the main section.

Abstract: An illumination unit including a discharge lamp is provided. The discharge lamp may have an electrode, and a reflector with a reflective surface and an optical axis, the electrode having in a sectional plane, which includes the optical axis, a sectional area, and a projection of the reflective surface of one of the halves of the reflector that are separated by the section perpendicularly into the sectional plane along optical paths that are free for the light of the illumination unit resulting in a projected area, wherein the overlap of the projected area and the sectional area is smaller than the area of the electrode in a plane which is perpendicular to the sectional plane and includes the optical axis.

Abstract: The invention relates to a method for operating a gas discharge lamp, in which the shape of at least one electrode of the gas discharge lamp is changed, in which by changing the lamp current for a predeterminable duration, at least one current pulse is generated such that structures which have grown on the at least one electrode are at least partially removed, the current pulse being generated for the duration of at least one entire half cycle of the AC voltage or the alternating current if the gas discharge lamp is fed AC voltage or alternating current, and the current pulse being generated with a pulse duration of between approximately 0.1 s and approximately 5 s if the gas discharge lamp is fed DC voltage or direct current.

Abstract: An illumination unit including a discharge lamp is provided. The discharge lamp may have an electrode, and a reflector with a reflective surface and an optical axis, the electrode having in a sectional plane, which includes the optical axis, a sectional area, and a projection of the reflective surface of one of the halves of the reflector that are separated by the section perpendicularly into the sectional plane along optical paths that are free for the light of the illumination unit resulting in a projected area, wherein the overlap of the projected area and the sectional area is smaller than the area of the electrode in a plane which is perpendicular to the sectional plane and includes the optical axis.

Abstract: A lamp arrangement is provided. The lamp arrangement may include a cooling device, which has a reflector housing and a lamp vessel of a lamp, which lamp vessel passes through a cutout in the reflector housing and is cooled by means of the cooling device, wherein the cooling device has a cooling fluid inlet cutout and a cooling fluid outlet cutout, which are provided on the opposite end sections of the lamp vessel within or adjacent to the cutout in the reflector housing.

Abstract: The invention relates to a method for operating a gas discharge lamp, in which the shape of at least one electrode of the gas discharge lamp is changed, in which by changing the lamp current for a predeterminable duration, at least one current pulse is generated such that structures which have grown on the at least one electrode are at least partially removed, the current pulse being generated for the duration of at least one entire half cycle of the AC voltage or the alternating current if the gas discharge lamp is fed AC voltage or alternating current, and the current pulse being generated with a pulse duration of between approximately 0.1 s and approximately 5 s if the gas discharge lamp is fed DC voltage or direct current.