Abstract: In the case of an apparatus for providing a sinusoidally amplitude-modulated operating voltage, two switches are arranged in the form of a half bridge, and an LC element is arranged downstream of the half bridge. The first switch is driven by a first square-wave signal in a clocking with the amplitude modulation frequency per clock cycle, and the second switch (QLOW) is driven by a second square-wave signal, which is shorter than the first signal, with a temporal offset with respect to the first signal in each clock cycle. The LC element (LMOD, CMOD) acts as a filter for the signal resulting from the driving of the switches at a connection point (K) between the switches and allows a DC voltage component and a sinusoidal component of the signal with the fundamental frequency of the clocking to pass through, but substantially filters out harmonics.

Abstract: An illumination device comprising a connection carrier (1), at least one light-emitting diode (10), an electrically insulating layer (3) and a fixing device (4) is specified. The connection carrier (1) has a first main area (1a) and a second main area (1b) remote from the first main area. The light-emitting diode (10) is fixed on the first main area (1a) of the connection carrier (1). The electrically insulating layer (3) is fitted to the second main area (1b) of the connection carrier (1) and projects laterally beyond the second main area (1b) of the connection carrier (1). The fixing device (4) is suitable for fixing the illumination device to a mounting area (2a) of a carrier (2), wherein the electrically insulating layer (3) is arranged between the second main area (1b) of the connection carrier (1) and the mounting area (2a) of the carrier (2). Furthermore, the fixing device (4) presses the connection carrier (1) against the mounting area (2a).

Abstract: A lamp module for projectors, in particular for digital cinema and video projectors, has a reflector system which has at least two reflectors and in which a lamp is accommodated. The reflector system is electrically connected to the lamp and bears the lamp such that the reflector system and the lamp can be inserted into the projector as a preassembled unit and considerably simplifies assembly.

Abstract: A base for a reflector lamp arrangement has a cutout, into which a section of a built-in lamp of the reflector lamp arrangement can be inserted. The insertion can take place in such a way that the contacts of the built-in lamp can be connected to the contacts of the base in the cutout, and the built-in lamp is held via at least one wall section of the cutout. In addition, a base with a built-in lamp for a reflector lamp arrangement is provided. In this case, the base is cast with the built-in lamp by a composition which has low viscosity in the unhardened state, preferably by means of cement.

Abstract: A lighting device includes at least one light-emitting diode and a cooling aggregate (400) for cooling the at least one light-emitting diode, wherein the at least one light-emitting diode is arranged on the cooling aggregate (400) and the cooling aggregate (400) is provided with at least one recess in which a mounting plate (408) equipped with electrical components is located. Also described is a vehicle headlight including at least one lighting device of the aforementioned kind.

Abstract: The operating method is based on the simultaneous application of FM and AM. In this process, the fundamental frequency of the AM is derived from at least one, preferably the second, longitudinal mode. In continuous operation of the lamp, the color temperature is set for a prescribed power by setting the AM degree controllably.

Abstract: An LED illumination system comprising an LED light source (3) which emits light (8) in a main direction (9) and a first optical element (1), a second optical element (2) is arranged downstream of the first optical element (1) in the main direction (9), and the second optical element (2) has on a light entrance surface (6) which faces the LED light source (3) a surface structure (4) that comprises a plurality of pillow-shaped prominences (5).

Abstract: An inventive method for determining the bulb temperature (T) of high pressure discharge lamps is disclosed that comprises the following steps: ascertaining a first spectral radiant power (MP) at a first wavelength (?P); ascertaining a second spectral radiant power (MC) at a second wavelength (?C) different from the first; determining the quotient (?) from the first and second radiant power; and determining the temperature (T) of the bulb on the basis of this quotient. It likewise discloses an apparatus for carrying out the inventive method.

Abstract: A lighting device includes at least one light-emitting diode (3) and a cooling aggregate (1) for cooling the at least one light-emitting diode (3), wherein the cooling aggregate (1) is provided with locking elements (17, 18, 19) adapted to form a bayonet catch with a fixing device (30) holding the lighting device. Preferably, at least one of the lighting devices is mounted as the light source in a vehicle headlight.

Abstract: An electronic ballast for the operation of a lamp arrangement includes at least one lamp, in particular, a low-pressure discharge lamp and at least one transformer for balancing the lamp currents, whereby the transformer has two windings, provided for one or more lamps of the lamp arrangement. The transformer is embodied as a saturation balancing choke.

Abstract: A method for making electrically conductive contact with and mechanically fixing a power supply element (12a) with a base element (10) of a lamp. The lamp comprises a luminous element (24), which is arranged within a closed luminous body (22) and can be connected to the power supply element (12a) so as to supply electrical energy. The base element (10) comprises at least one connection contact (28), by means of which the base element (10) can be connected to an electrical power source.

Abstract: A reflector lamp whose lamp receptacle (1) is provided in part with a reflective coating (6) as well as a reflector contour. The coating is composed of at least two layers of highly heat-resistant metals. One of the layers reflects as well as possible while the superimposed layer absorbs as well as possible.

Abstract: A luminous means having a first, light-transmissive carrier (1), a second carrier (3), and an organic layer stack (4), which is arranged between the first carrier (1) and the second carrier (3), at least one electrical connection region (5) being provided on the rear side (4), which faces away from the first carrier (1), of the second carrier (3), which connection region is provided for connecting the luminous means (20) to a further, identical luminous means. In addition, the invention specifies a lighting device with such a luminous means.

Abstract: A light-emitting diode system (1) comprising at least one light-emitting diode component (2), in which a light-emitting diode chip is arranged in a light-emitting diode housing (21) on a heat sink (22) which can be thermally connected at the rear side (25) of the light-emitting diode housing (21). A carrier plate (3) having a front side (34) and a rear side (31) and a hole for receiving the light-emitting diode component (2) is provided. The light-emitting diode component (2) projects into the hole from the rear side (31) of the carrier plate (3). An electrically insulating thermal connection layer (5) is applied at the rear side (31) of the carrier plate (3), said thermal connection layer being thermally conductively connected to the heat sink (22). A method for producing a light-emitting diode system is also described.

Abstract: A heatsink (2), comprising a heatsink body (3) extending between two endsides (4, 5) of the heatsink body. The heatsink is designed for introducing the heatsink with the first endside ahead into an aperture (16), which is provided in a wall (17), and for a thermal conductive connection of a heat-generating element (14) to the second endside, with a main direction of extent (6) of the heatsink body (3) from the first endside (4) to the second endside (5) being bent or sharply bent. Furthermore, an illumination system with such a heatsink is disclosed.

Abstract: A method for operating a high-pressure discharge lamp having an electrical voltage with a periodically alternating polarity. According to said method, during the operation of the high-pressure discharge lamp, the lamp is monitored for flickering, the occurrence of vibration, and preferably the exceeding of static parameters (e.g. lamp overvoltage) of the high-pressure discharge lamp.

Abstract: A method for producing a light emitting diode arrangement. A plurality of LED modules (110, 120, 130) are provided, which in each case comprise at least one radiation emitting semiconductor component (1000) on a carrier body (1300). At least one separately fabricated connection carrier (200) is provided. The LED modules are arranged in such a way that they are adjacent to one another in pairs. A mechanically stable and electrically conductive connection between the carrier bodies of two LED modules is produced by means of the connection carrier. Furthermore, a light emitting diode arrangement is disclosed.

Abstract: The bulb of the lamp is closed at opposite ends by sealing parts (6), with in each case one cap (8) being fitted at one end, the cap having an electrical contact element (13) which is connected in an electrically conductive manner to a supply conductor (15) leading to a luminous means, the contact element being accommodated in a tubular extension (11) of the sealing part. The cap part (8) has an adjustment part (14; 24), which is directed inward with respect to the interior of the lamp and is in contact with the sleeve (11) via a bracket.

Abstract: Circuit arrangement having a converter without a transformer but with an inductor for the pulsed operation of dielectric barrier discharge lamps The circuit arrangement according to the invention comprises an inductor-type converter for the pulsed operation of dielectric barrier discharge lamps (EL). The invention proposes both a half bridge variant and a full bridge variant. By selecting the inductance value of the inductor (L), it is possible to influence the edge steepness of the pulses, in the case of more than one inductor even independently for the rising and falling edges.

Abstract: The invention relates to a novel ballast for a discharge lamp, in which a continuous-operation control circuit is brought out of operation when a physical operation, which defines a preheating time, of a preheating timer has as yet not been sufficiently returned if the lamp is intended to be restarted.