Abstract: In an embodiment a light emitting device includes a light source, a switching element having an input capacitance associated therewith, the switching element being configured to control a current flow to the light source in accordance with a charging of the input capacitance; a voltage control element coupled with the switching element and having a voltage supply node, the voltage control element having a second capacitance associated therewith, wherein the voltage control element and an input of the switching element are coupled to one another such that the voltage control element and the input of the switching element form a capacitive voltage divider and a driving element configured to provide a driving voltage at the voltage supply node, the driving voltage being greater than a maximum allowable input voltage of the switching element, wherein a relationship between the input capacitance and the second capacitance is in accordance with a relationship between the driving voltage and the maximum allowable in

Abstract: A lighting device for mechanical connection to a textile, comprising comprises an electrically operable illuminant, a light guiding element which, in terms of lighting engineering, is coupled to the at least one illuminant and is configured at least partly to receive, guide and emit the light emitted by the at least one illuminant, an at least three-pole electrical luminaire plug connector for electrical connection to an electrical battery appliance, wherein the luminaire plug connector is electrically connected to the at least one illuminant, wherein the illuminant and/or the light guiding element have/has a connection element for mechanical connection to the textile, a control voltage unit, which is electrically coupled to the luminaire plug connector for application of the electrical operating voltage and is configured to provide depending on the illuminant at the luminaire plug connector a control voltage for control of the operating voltage by of the battery appliance.

Abstract: In various embodiments, a retrofit lamp for vehicle headlight is provided. The retrofit lamp includes at least one semiconductor light source, a plurality of light output coupling optical units, and a light-guide apparatus which is embodied to guide light from the at least one semiconductor light source to the light output coupling optical units. The light-guide apparatus includes at least one light-exit end, at which the light output coupling optical units are arranged spaced apart from one another.

Abstract: In various embodiments, a retrofit lamp for vehicle headlights is provided. The retrofit lamp includes at least one semiconductor light source, a light output coupling optical unit, and a light guide configured to guide light from the at least one semiconductor light source to the light output coupling optical unit. The light output coupling optical unit has a light-reflecting embodiment and includes a first end and a second end. The first end is arranged closer to the at least one semiconductor light source than the second end. The light output coupling optical unit, proceeding from the second end, has a tapering embodiment in the direction of the first end.

Abstract: A high-pressure discharge lamp comprising a translucent discharge vessel which encloses a discharge space and has two sealed ends. Two electrodes extend from the sealed ends into the discharge space, and a fill is arranged in the discharge space for generating a gas discharge. Electrical feeds lead out of the sealed ends for supplying energy to the electrodes, with an electrically conductive layer acting as an ignition aid being arranged on the surface of the discharge vessel. The electrically conductive layer comprises at least a first layer section and a second layer section, the first layer section being arranged on a first sealed end of the discharge vessel and extends onto the surface of that region of the discharge vessel which encloses the discharge space. The second layer section is arranged on the second sealed end of the discharge vessel and extends onto the surface of that region of the discharge vessel which encloses the discharge space.

Abstract: A device for operating a high-pressure discharge lamp (930) with a bipolar supply current and a regulated power input. The device includes a regulator (961) with an asymmetrical regulating characteristic curve for forming a current or power impulse (K1, K2) close to the zero crossing of the supply current.

Abstract: The invention relates to a high-pressure discharge lamp having a discharge vessel (10) sealed at both ends, a filling which can be ionized and is enclosed in the discharge area (106) of the discharge vessel (10), and electrodes (11, 12) which extend into the discharge area (106), in order to produce a gas discharge, with the discharge vessel (10) having an electrically conductive coating (107) which is designed as a starting aid and is arranged at least in the boundary area (109) between the discharge area (106) and a first sealed end (102) of the discharge vessel (10).

Abstract: The invention relates to a high-pressure discharge lamp having a transparent discharge vessel, an ionizable filling which is arranged in the discharge space of the discharge vessel and electrodes, which extend into the discharge space of the discharge vessel, for the purpose of producing a gas discharge, as well as power supply lines, which are passed out of the discharge vessel, for the purpose of supplying energy to the electrodes, the discharge vessel of the high-pressure discharge lamp being provided partially with an electrically conductive coating, with the result that a capacitive coupling is produced between the coating and at least one electrode and/or power supply line. As a result, the starting properties and the luminous efficiency of the lamp are improved.

Abstract: A device for operating a high-pressure discharge lamp (930) with a bipolar supply current and a regulated power input. The device includes a regulator (961) with an asymmetrical regulating characteristic curve for forming a current or power impulse (K1, K2) close to the zero crossing of the supply current.

Abstract: Sodium high-pressure lamps can be operated by a circuit arrangement which rectifies the AC line voltage and, dispensing with smoothing, feeds it directly to an inverter for generating a frequency above 1 kHz. Via an RF inductor and an ignition transformer, the lamp, which preferably contains a xenon filling above 1 bar, is fed the voltage modulated with twice the line frequency. The saving in electric energy of the lamp/ballast system is 30% by comparison with an inductor-driven Hg-free standard lamp, given the same luminous flux. The use of a microprocessor to control the half bridge permits an externally controlled or automatic lowering of power with a further potential energy saving of 35% on average over the year, and an end-of-life shutdown of the system in order to avoid cycling.

Abstract: A high-pressure discharge lamp has integrated in its base or base housing a circuit arrangement (SCH) which combines a starting device and a power reducing circuit which comprises a phase-gating control (PS). A capacitor (C2) connected in parallel with the lamp (L) provides a transfer voltage which is distinctly higher than the input voltage of the arrangement.

Abstract: A circuit arrangement for starting and for operating high-pressure lamps makes an increased transfer voltage available to the discharge lamp. The increased transfer voltage is generated by voltage doubling across a rectifier unit by means of a charging capacitor (LK), separated into two individual capacitors (C1, C2), the common midpoint (M) of the capacitors (C1, C2) being connected to the two network inputs of the rectifier unit.

Abstract: To provide for effective control of a discharge lamp, typically, a sodium gh pressure discharge lamp, which operates in two phases, namely, a power pulse phase, followed by a holding phase, without extensive and complex electronic circuitry, two individual oscillator systems are provided, one for each phase; the oscillator systems include a first power burst oscillator formed as a first half bridge by two transistors (T1, T2), and an individual connecting current limiting inductance (L1) to the lamp (E), and a second oscillator including a two-transistor second half bridge (T3, T4) and an individual current limiting inductance (L2) coupled to the lamp. The respective oscillators are controlled, in a closed control loop, by a burst generator (BG) and a holding pulse generator (SG), each of which provide their signals to a logic circuit (LK) which provides for exclusive control of the respective first or second half bridge.

Abstract: To control the color temperature of a sodium high-pressure discharge lamp, preferably having a sodium and xenon fill, which may also include mercury, without essentially affecting the color rendition index of the emitted light, or the light flux or intensity of light radiation emitted, the lamp is operated under pulsed conditions, in which the instantaneous pulse power of recurring power pulses, separated by a holding phase to prevent extinction of the lamp, is controlled. Preferably, the overall energy of any one of said power pulses and the intervening holding pulse is maintained essentially constant, for example by varying the frequency of sub-pulses or oscillations of which the sequential power pulses are constituted. A frequency and power controllable oscillator (1) is connected to the lamp (3) through a series LC network to effect such control, thereby permitting adjustment of color temperature and matching of the light output to selective color reflectivity of illuminated objects.

Abstract: To provide for optimum control of a sodium high-pressure discharge lamp operating under saturated operating conditions, such that the lamp will be operating stably and providing light output which is an optimum with respect to the color rendition index (Ra), light output or luminous flux, and color temperature, without regard to manufacturing tolerances or variations in power supply voltage, the energy supplied to the lamp is controlled with respect to a quotient formed of lamp voltage and lamp current (V.sub.L /I.sub.L), said quotient being determined with respect to optimum light values. The power supply for the lamp (3) either is a stabilized output voltage power supply (22) in which the output current is controlled, or an oscillator (32) providing bursts or power pulses (10, 10') formed of oscillations (11).