Abstract: The invention is a device for operating a high-pressure gas discharge lamp, which is provided with a starting auxiliary electrode, with a current of alternating polarity. The device has a series resonance circuit with a resonance inductive resistor, through which flows the lamp current when the lamp is in operation, and a starting device for subjecting the starting auxiliary electrode to the starting voltage required for starting the gas discharge in the high-pressure gas discharge lamp. There is also a capacitive component, which is connected in series to the resonance inductive resistor and is dimensioned in such a manner that the capacitive component effects, after the gas discharge in the high-pressure gas discharge lamp has been started, at least a partial compensation for the inductance of the resonance inductive resistor, through which the lamp current flows.

Abstract: The invention relates to a light module with at least one light source (4) and a reflector (2), which is arranged so as to reflect the light radiation emitted by the light source (4), a colored anodized layer (22) being formed on at least regions of the upper side (21), which is formed so as to reflect the light radiation, of the reflector (2), which anodized layer is in the form of a spectral filter for the light radiation impinging from the light source (4).

Abstract: An infrared headlight useful in a night vision system may be made with an infrared emitter positioned in a reflector. The radiation source is associated with a filter body which has a first filter layer part and a second uncoated part. The two parts are designed so the radiation transmitted through the uncoated part strikes a different area of the reflector than the infrared radiation transmitted through the filter layer. The two regions of the reflector may have differing reflective characteristics.

Abstract: The elongate bulb (1) of the lamp, which defines a longitudinal axis (A), is closed at opposite ends by sealing parts (6; 32), with in each case one cap being fitted at one end, the cap having an electrical contact element (13; 25) which is connected in an electrically conductive manner to a supply conductor (15; 21) leading to a luminous means, the contact element being accommodated in a tubular extension (11; 22) of the sealing part; the contact element (13; 25) has an attachment part (14; 24) which is directed inward toward the lamp interior and is equipped with at least two barbs (20; 26) which are in contact with the tubular extension (11; 21).

Abstract: The invention relates to a vehicle headlight bulb with a bulb receptacle, a spiral wound filament (2) which is arranged inside the receptacle for the bulb (1) and a lamp base which has a metal base bushing (3) wherein the end (11) of the bulb receptacle (1), which is sealed by means of a molybdenum film seal (112, 113) is fixed. According to the invention, the metal base bushing (3) comprises at least one molded tab (32) which lies adjacent to thc scaled end (11) of the bulb receptacle (1), in the overlapping area of the molybdenum films (112, 113), with current supply wires (23,24) which protrude from the bulb receptacle and which are connected thereto, in order to reduce thermal load in the above-mentioned overlapping area during operation of the bulb.

Abstract: High-pressure lamp with a base, having an inner vessel sealed in a vacuum-tight manner, and surrounded by a sleeve part, a base having electrical terminals bearing, on one side, the inner vessel and, on the other side, the sleeve part, the reflector being of rotationally symmetrical design, and having a contour divided into at least two zonal layers, whose axial height is dimensioned such that each zone captures at least 35% of the light intensity emerging from the center of the inner vessel, and a first zone reflecting back at least 90% of the light incident on it at positive angles in relation to the lamp axis, and a second zone reflecting back at least 90% of the light incident on it at negative angles in relation to the lamp axis, and the inner vessel containing a metal halide filling, and the lamp having a specified average color temperature.

Abstract: The invention relates to an electronic ballast and to a controller which drives this ballast, in which two communication protocols are provided for the digital drive.

Abstract: The invention relates to an operating method and an electronic ballast (EVG) for operating a light-producing apparatus (L), for example a discharge lamp. In this case, an internal timing unit in the ballast (EVG) is corrected with the aid of time information (TM) received in external signals.

Abstract: A luminaire for installing in the cover cap of an exterior rearview mirror for motor vehicles, has a luminaire housing and an electrical lamp arranged therein. The housing is entirely or partly of transparent design, such that in the installed state light exit surfaces of the housing are arranged both on the front side and on the rear side of the exterior rearview mirror. The lamp has a tubular, sealed lamp vessel, at least a portion of the lateral surface of the lamp vessel and an end face of the lamp vessel being of transparent design. Light directing elements for focusing the light emerging from the lateral surface and for deflecting the light emerging from the end face are provided such that the light emerging from the end face is directed toward a light exit surface arranged opposing the light emerging from the lateral surface.

Abstract: To increase the high-voltage resistance of a metal halide high-pressure dharge lamp, the external leads (6, 6', 6") are spaced wider apart than previously at their exit point from a pinch seal (3', 23', 23"). To facilitate manufacture, and to permit the widened spacing of the electrodes, the lamp portion (3) which will form the pinch seal is pre-heated in a first step and deformed into elongated oval cross section, leaving enough space to introduce a subassembly formed of the electrode connecting leads (6), internal electrodes (7) and molybdenum sealing foils (9); the sealing foils (9) may then already be located with a spacing which is increased with respect to spacing usually customary in the prior art. The external connecting leads (6) are secured to the sealing foils (9) so that attachment points extend at right angle to the sealing foils; the attachment leads can be angled within the press seal (FIG.

Abstract: To insure starting of an oscillatory circuit for fluorescent lamp operation scillating, for example, at about 35 kHz, two transistors are serially connected across the output of a rectifier adapted for connection to an a-c network, and the oscillatory circuit is additionally coupled to one of the a-c terminals of the rectifier, to apply to one of the transistors a triggering voltage which recurs with each undulation of the a-c network. The serially connected transistors each have an emitter resistor, which may be a PTC resistor, to balance currents through the transistors and eliminate unbalancing effects of manufacturing tolerances in the transistors. The PTC resistors additionally have current deviation regulating function.