Abstract: The invention relates to a closure system (1) for closing an opening (20) of a vehicle light, having a closure element (10) and an opening (20) of a vehicle light, wherein the opening (20) has an edge (21), the edge (21) of the opening (20) being in particular conical or at least substantially conical in shape. The invention further relates to a vehicle light having such a closure system (1).

Abstract: The invention relates to a ventilation system for vehicle lighting systems having a housing opening with a protruding opening wall and a ventilation body, which is fixed to the housing opening by engagement with an inner part. The ventilation body and the housing opening have walls for forming a ventilation duct with a plurality of direction changes between an edge of the ventilation body and an aperture of the housing opening, wherein an inner part and an outer part which surround the opening wall of the housing opening have walls, which respectively sectionally lie circumferentially sealingly against the opening wall of the housing opening, and wherein the ventilation body and the housing opening are formed such that the ventilation body can be brought from an unlocked position into a locked position or vice versa by rotation according to a predetermined angle of rotation relative to the housing opening.

Abstract: A ventilation system for a vehicle headlight housing. The ventilation body has an inner part extending into the housing opening as well as an outer part extending circumferentially about the opening wall of the housing opening, which on the one hand offers, in the locked position thereof, a sealing attachment and on the other hand provides a labyrinthic ventilation channel.

Abstract: A ventilation system for a vehicle headlight housing. The ventilation body has an inner part extending into the housing opening as well as an outer part extending circumferentially about the opening wall of the housing opening, which on the one hand offers, in the locked position thereof, a sealing attachment and on the other hand provides a labyrinthic ventilation channel.

Abstract: The invention relates to a ventilation system for vehicle lighting systems comprising a housing opening with a protruding opening wall, a ventilation body, which is fixed to the housing opening by engagement with an inner part thereof, wherein the ventilation body and the housing opening have walls for forming a ventilation duct with a plurality of direction changes between an edge of the ventilation body and an aperture of the housing opening, wherein an inner part and an outer part which surround the opening wall of the housing opening have walls, which respectively sectionally lie circumferentially sealingly against the opening wall of the housing opening, the ventilation body and the housing opening are formed such that the ventilation body can be brought from an unlocked position into a locked position or vice versa by rotation according to a predetermined angle of rotation relative to the housing opening.

Abstract: The invention relates to a closure system (1) for closing an opening (20) of a vehicle light, having a closure element (10) and an opening (20) of a vehicle light, wherein the opening (20) has an edge (21), the edge (21) of the opening (20) being in particular conical or at least substantially conical in shape. The invention further relates to a vehicle light having such a closure system (1).

Abstract: To largely, or entirely inhibit glow discharges during the start-up or run-on phase (Ta) of a high-pressure discharge lamp, the lamp is operated in a second time period (T2) immediately after ignition (T1) with continuous direct current during which the electrode of the lamp which then functions as an anode has reached emission temperature; in a third time period (T3), the polarity of the direct current is reversed and the other electrode, which now will function as an anode, is heated to emission temperature; thereafter, alternating current energy is supplied to both electrodes, typically in frequencies between 90 and 150 Hz. A suitable second time period (T2) can be about 2 to 21/2 second, the third time period (T3) being shorter. The total warm-up time may extend to a minute or more; current being supplied during the second, third and subsequent periods is usually higher, for example by a factor of 1.5 of the normal or rated operating current.

Abstract: To ensure ignition of a high-pressure discharge lamp, for example a metal vapor halogen high-pressure dicharge lamp which has an ignition circuit, and is operated by direct current from an inverter circuit controlled for pulse width modulation, current flow to the lamp is extended in time upon initial energization thereof so that an initial hot spot which forms on an electrode can remain hot to establish a stabilized arc. This extension of current flow can be obtained by an R/C circuit in parallel to the output or storage capacitor (C.sub.A) of the inverter circuit (FIG. 1) or by an NTC resistor (H) in series with the lamp, or by a resistor which is short-circuited by a relay contact as the lamp operates, or the like.

Abstract: A switched mode power supply (SNT) is coupled to a source of d-c energy (U.sub.Batt) and provides electrical energy to a lamp within widely varying limits. The switching conditions of the switched mode power supply are controlled by an operation control circuit (ADD) which has a current sensing resistor, serially connected to the lamp, to provide a lamp current signal, and a voltage divider (R2, R3) connected across the lamp to sense lamp voltage and provide a lamp voltage signal. The lamp current signal and the lamp voltage signal are added, compared in a comparator formed by an operational amplifier (IC2-A), with respect to a reference setting power level, and the output signal from the comparator is coupled back to the switched mode power supply to control the switching rate thereof, based on the instantaneous lamp current and lamp voltage. Excess voltage can be compensated by providing either an active semiconductor switching network (T1, T2, FIG.

Abstract: A control circuit for controlling a known active harmonic filter operating as a step-up converter in a power supply with sinusoidal network current input and a power factor of almost unity. The step-up converter comprises: a main rectifier, a storage inductance (L.sub.S), a cross-connected high-speed transistor (T.sub.Q), a diode (D1) and a power storage capacitor (C.sub.L). The high-speed transistor (T.sub.Q) is controlled by a first threshold switch (STc) whose input is controlled by a control capacitor (C12) coupled to receive a signal representative of instantaneous rectified d.c. output voltage (U.sub.E), instantaneous power output voltage (U.sub.o) and a signal representative of the charge state of the inductance.