Abstract: The electric lamp-reflector unit has a molded reflector body (1) comprising adjusting lugs (22) integral with a reflector part (2) positioned at the light emission window (28).

Abstract: The electric-lamp/reflector unit has a moulded reflector body (1) comprising a hollow neck-shaped portion (5). An electric lamp having a lamp vessel (11) provided with a first (14) and a second opposed end portion (15) is fixed at its first end portion within the neck-shaped portion. The neck-shaped portion (5) has a narrowed portion (6) adjacent the reflecting surface (3) of the reflector body, from which portion the neck-shaped portion widens conically towards a cap (20) borne by the neck-shaped portion.

Abstract: The electric lamp has a glass lamp vessel in the wall of which current conductors of molybdenum or tungsten are accommodated, which extend to the outside. Exclusively where the current conductors are in contact with gas, they have a skin of their own phosphide. The skin protects the current conductors from being progressively oxidized. The lamps can easily be manufactured.

Abstract: The electric incandescent lamp has a filament connected to current supply conductors and kept taut by a frame of longitudinal arc discharge conductors and transverse insulators. The arc discharge conductors are each connected to a point on the current supply conductors, at least one of them being connected through a arc discharge interruption fuse. When switching on and operating the lamp, the arc discharge interruption fuses and the arc discharge conductors are not included in the current circuit. The arc discharge conductors are positioned with respect to the filament so that upon formation of a discharge arc between fragments of the filament the arc flashes over to the arc discharge conductors. Only upon flash over of the arc to the arc discharge conductors does current flow through the arc discharge interruption fuse. The fuse interrupts the current and extinguishes the arc.

Abstract: The electric lamp has a lamp vessel (1) having a pinched seal (2) in which a metal foil (3) is accommodated as current lead-through conductor, which is connected to several external current conductors (7). The current conductors (7) are secured via a metal strip (8) to a current supply wire (14). Thus, deformations of the external current conductors (7) are avoided, which lead to mechanical stresses in the pinched seal (2) and to rupture thereof.

Abstract: A halogen incandescent lamp has current-supply conductors, at least one of which is enclosed by an insulator tube which is anchored in the wall of the lamp envelope and extends beyond the end of this current-supply conductor as far as the proximity of the filament. The insulator tube protects the lamp during operation in series arrangement at mains voltage from exploding at the end of its life due to overheating by an arc discharge. The speed at which a discharge arc is extinguished can be increased by enclosing each current-supply conductors in its own insulator tube and is further improved if nitrogen or helium is used as an inert gas.

Abstract: The electric incandescent lamp for operation at line voltage has a glass lamp vessel (1) provided with a pinched seal (5), in which a metal foil (9) is embedded, which is connected to an internal current conductor (14) extending to a filament (4). The major surfaces (7, 8) of the pinched seal (5) have above the internal current conductor (14) an embossed part (17, 18), as a result of which a space (23) is present in the pinched seal (5) on either side of said current conductor (14). Depressions (19-23) increase the resistance to pressure of the lamp vessel (1). A discharge arc that can be produced in the lamp extinguishes when the arc has reached the pinched seal (5) if the internal current conductor (14) has a wire diameter of at most 200 .mu.m.

Abstract: An electric lamp having a glass lamp vessel 1 with a seal 7 coated with an intermediate coating layer of zirconium oxide 8. Lamp vessel 1 is connected at its seal 7 by a sealing cement 9 to a lamp cap 2. Zirconium oxide coating 8 completely separates seal 7 from sealing cement 9 and reduces mutual adherence therebetween. During operation of the lamp, zirconium oxide coating 8 reduces the thermal load and prevents cracking of seal 7 of lamp vessel 1.

Abstract: The electric lamp according to the invention has a mainly tubular glass lamp vessel (1) coated with an interference filter (5) of alternating layers of SiO.sub.2 and of a material having a comparatively high refractive index. The lamp vessel 1 has portions at the area of and near its seals (6,7) having a form deviating from the tubular form and is in situ free from the material having a high refractive index of the interference filter (5). As a result, the lamp vessel (1) has a comparatively high resistance to pressure.

Abstract: The sections of the filament of a projection lamp are stretched over two sets of supports anchored in glass beams which are fixed on the rigid current supply conductors to form a frame. The supports each consist of a wire having a hooked end which engages the filament between a respective pair of adjacent sections. The supports of at least one set each have an end portion extending transverse to the main link of the support. Each end portion is located at the same given distance from the bend of the hook, and preferably extends from a free end of the hook. This permits each section to be under the same tension.

Abstract: In halogen incandescent lamps having a filament 5 substantially of tungsten and a filling comprising bromine and an inert gas, a specific attack of internal current conductors 6 consisting substantially of tungsten occurs within the temperature range from 600.degree. to 1300.degree. C., which results in the formation of pits or craters in these internal current conductors 6.In order to obviate such attack of internal current conductors 6, the internal current conductors 6 consist at least at their surface of a tungsten containing at least 0.1% by weight of rhenium.