Abstract: A method for recycling thoriated tungsten objects such as thoriated tungsten scrap resulting from the fabrication of electrodes for lamps. The thoriated tungsten objects are oxidized, homogenized by mixing and chemically reduced under a hydrogen gas atmosphere to form thoriated tungsten. This method eliminates the need to separate the tungsten from its dopants. The thoriated tungsten obtained as the end product is returned to the production process and is preferably used as a raw material for the production of welding electrodes or thoriated tungsten discharge lamp electrodes.

Abstract: The reflector high-pressure discharge lamp unit has a reflector (2), a high-pressure discharge lamp (3) arranged on the axis of the reflector (2), a first base part (4) connected to the neck (16) of the reflector (2), and a second base part (5), arranged in front of the radiation/light exit opening of the reflector (2) and in the form of a mechanical auxiliary part. The end of the second supply lead (18), led to the second lamp shank (10), of the high-pressure discharge lamp (3) is electrically connected directly to the end of the second high-voltage cable (7), and this free connecting region is embedded in the second base part (5). The result of this is a high degree of shock resistance and strain relief with this lamp connection.

Abstract: A discharge lamp for dielectrically impeded discharges, having a discharge vessel filled with a discharge medium and having discharge electrodes which are at least partly separated from the discharge medium by a dielectric layer, wherein the discharge vessel is elongated at least in a longitudinal direction, characterized by a thermal device for controlling the heat transport into and out of the lamp nonhomogeneously in the longitudinal direction, which is designed such that in operation, the temperature in the lamp is made homogeneous in the longitudinal direction.

Abstract: A lighting device equipped with an aperture lamp (1) includes two optical means (8, 9) disposed in series, wherein at least the first means (8) viewed in a sectional plane perpendicular to the lamp's longitudinal axis, is curved. The first means (8) bundles the broad light-ray distribution emitted by each area element in the region of the aperture toward the normal to the respective area element. The second means (9) deflects at least some of the light bundles arriving from the first means by a deflection angle, the deflection angles of at least some of the light bundles having different values. In this way the light emitted by the curved aperture surface can be directed in a specific manner, such as “parallelized”.

Abstract: A method and a circuit for operating a direct current metal halide arc lamp. The lamp is activated by a periodic signal UL(t), and the duration Taus between the beginning of the fall from a maximum value and the subsequent rise in signal amplitude ranges from 1 to 50 &mgr;s. A pulsator is arranged between the ballast and the starter in addition to a direct current metal halide arc lamp which is filled by additional constituents, namely thallium, at a concentration of 0.6 to 3.0 &mgr;mol/ml in addition to an ignition gas, mercury, and lithium at a concentration of 0.2 to 0.5 &mgr;mol/ml.

Abstract: A discharge lamp (1) including a tubular discharge vessel (2), filled with inert gas and, optionally, a fluorescent layer, having at least three elongated electrodes (3, 4, 5) arranged parallel to the longitudinal axis of the tubular discharge vessel (2). The electrodes are arranged in such a manner that the relationship s a ≥ 0.1 is satisfied, wherein s is the maximum spacing between an imaginary connecting line of an electrode pair and the most closely neighboring point on the wall of the tubular discharge vessel, and a is the mutual spacing between the electrodes of such electrode pair. A higher luminous density is achieved in this way. The lamp is particularly advantageous for a pulsed, dielectrically impeded discharge.

Abstract: A metal halide discharge lamp having a bulb which contains a fill including an ignition gas, mercury, a halogen, lithium, indium, thallium and tin, and which is devoid of a rare earth element. Such fill serves to lengthen the service life of the lamp. The lamp is especially suitable for effect lighting.

Abstract: To permit easy handling and pivoting of the flash head of a flash gun using n elongated flash tube, in which the reflector units are rotatable relative to each other, a tubular structure (2) is provided retaining electronic and energy supply components for the flash gun, terminating in a cylindrical flange platform (3); the flash tube (8)-reflector (7) combination is located in a cylindrical housing (4) which has a cylinder axis (6) at right angles to the axis (5) of the tube, the housing (4) terminating in a flange-like extension having a cylindrical end portion (11) which fits on the platform (3) of the tube, and is rotatable with respect thereto.