Abstract: To simply and reliably retain a heat retention tube or sleeve (10) within envelope (1) and surrounding the arc tube or discharge vessel (4) of the lamp, end regions of the heat retention or conservation tube are pinched around current supply leads (7) which pass through the pinch or press region (11). To prevent dislocation of the tube or sleeve (10), axially as well as rotationally with respect to the arc tube, the current supply leads are deformed in the region of the pinch or press (11), for example by being flattened or deflected in a bend or V-shape from a straight wire. An exhaust tube (12) can be passed through the pinch (11) if the pinch extends across the entire diameter of the heat retention tube; otherwise, the pinch need only extend over a portion thereof, thus providing for pneumatic communication between the interior of the heat retention tube and the envelope (1).

Abstract: To facilitate manufacture and assembly of a high-pressure discharge lamp ing an inner discharge vessel (4) within an outer bulb (1), and which is protected against explosion or bursting of the discharge vessel by a protective sleeve or body (8), typically formed of two sleeves or tubes (8a, 8b) of quartz glass or hard glass, the two glass tubes surround the discharge vessel (4) over its entire coaxial length and, when coated with an infrared (IR) reflective coating and an ultraviolet (UV) radiation coating, additionally function as a heat retention or heat damming element and a UV radiation protective element. Two ceramic insulating centering and holding elements are carried by a lamp holder structure (9), engaging the open ends of the glass tubes (8a, 8a). The ceramic elements are formed with steps (20a, 20b, 20c) or grooves (520a, 520b) to position the glass tubes spaced from each other and concentric with respect to the discharge vessel.

Abstract: To facilitate manufacture of a high-pressure discharge lamp in which a double-ended discharge vessel is located within an outer, essentially rotation-symmetrical bulb (1), the holder structure for the discharge vessel is formed of first and second punched sheet-metal elements (12a, 12b; 20, 21) which define surface planes, and are electrically separate from each other. A first punched sheet-metal (12a, 20) is electrically connected to a first current supply lead (7a) from the discharge vessel and a first current connector (11a) extending from the base. A second punched sheet-metal element (12b, 21) is electrically connected to the second current supply lead (7b) and the second current connector (11b, 11b') extending from the base. Both punched sheet-metal elements are located essentially in a central plane, and extend essentially perpendicularly with respect to the lamp axis (I--I).