Abstract: A hemispherical goniophotometer is disclosed, in which two pivoting arms are articulated on a revolving rotating arm and are each fitted with a measurement head. The geometry of the arrangement is chosen such that the measurement heads can move along the envelope surface of a hemisphere during rotating of the rotating arm through 360° and pivoting of the pivoting arms through 180°.

Abstract: An illumination device with at least one LED as the light source, the LED emitting primary radiation in the range from 370 to 430 nm of the optical spectral region (peak wavelength), this radiation being partially or completely converted into radiation of a longer wavelength by three phosphors which are exposed to the primary radiation from the LED and which emit in the blue, green and red spectral regions, so that white light is formed. The conversion is achieved at least with the aid of a phosphor which emits blue light with a wavelength maximum at 440 to 485 nm, and with the aid of a phosphor which emits green light with a wavelength maximum at 505 to 550 nm, and with the aid of a phosphor which emits red light with a wavelength maximum at 560 to 670 nm.

Abstract: An electrode (35) for metal vapor-containing discharge lamps consists of a high-melting, electrically conductive material, preferably of tungsten or a material which predominantly contains tungsten; it comprises a shaft (36) having a pin-shaped head part (37), which defines a longitudinal axis L, at least one hole (39) being arranged essentially transversely with respect to the longitudinal axis, in particular at an angle of 60 to 90° with respect to the longitudinal axis, in the region of the head part (37).

Abstract: An illumination device, comprising a light emitting diode (11) fixed on a circuit board (12). The illumination device furthermore has an optical element (10) disposed downstream of the light emitting diode (11) in a main emission direction (15), the optical element (10) being configured for directing a first portion (6a) of the electromagnetic radiation (9) emitted by the light emitting diode (11) during operation through the circuit board (12) in a direction away from the circuit board (12).

Abstract: An electric light bulb, in particular a halogen light bulb designed to be operated by mains voltage includes a substantially axially symmetrical bulb and a single-coil filament mounted in the bulb. The filament includes at least one incandescent coil section disposed outside the bulb axis. The incandescent coil is disposed axially in a transparent cylindrical sleeve which has an interference filter that reflects infra-red rays.

Abstract: The invention relates to a luminescence conversion led based illumination deice that emits primarily radiation in the range of from 370 and 430 nm of the optical spectrum (peak wavelength). Said radiation is converted to radiation having a longer wavelength using three luminescent substances that emit in the red, green and blue range.

Abstract: A circuit for operating high-pressure discharge lamps, wherein a voltage transformer for power supply to a loading circuit includes a connection for the high-pressure discharge lamp (La) and for the secondary winding (L1b) of an ignition transformer (T1) for an impulse ignition system for igniting a gaseous discharge in the high-pressure discharge lamp. The loading circuit includes at least one capacitor (C1) serially arranged with the secondary winding (L1b) of the ignition transformer (T1) when the impulse ignition system is reconnected, the capacity of the capacitor (C1) being selected in such away that the capacitor (C1) substantially forms a bridging for ignition impulses generated by the impulse ignition device in such a way that after ignition of the gaseous discharge in the high-pressure discharge lamp (La), at least one partial compensation of the ignition transformer (T1) is produced when the lamp current passes through the secondary winding (L1b).

Abstract: The lamp comprises a discharge vessel (2) which is closed off in a vacuum-tight manner and is arranged in an outer bulb (12), a getter material being held on a support body inside the outer bulb (12). The support body is a support strip (31) to which the getter material is applied, the support strip being bent in such a way that it is automatically held in the outer bulb (12) without the need for any auxiliary means.

Abstract: Phosphor from the class of the oxynitridosilicates, having a cation M which is doped with divalent europium, and having the empirical formula M(1-c)Si2O2N2:Dc, where M=Sr or M=Sr(1-x-y)BaYCax with x+y<0.5, the oxynitridosilicate completely or predominantly comprising the high-temperature-stable modification HT.

Abstract: The incandescent lamp is equipped with a luminous element which is hermetically inserted in a bulb together with a filling, the luminous element having a metal carbide whose melting point is above that of tungsten. The supply lead is fabricated integrally with the luminous element from a wire and provided with an electrically conducting coating which decisively improves the impact strength and make-proofness.

Abstract: The inventive white-light emitting luminescent conversion LED uses a chlorosilicate luminous substance which is doped with europium in addition to containing Ca and Mg and a garnet rare-earth substance, especially Y and/or Tb. This results in high quality color reproduction and highly constant lighting properties at various temperatures.

Abstract: A description is given of an illumination device which emits mixed-color light containing light of at least two different color channels (R, R1, G, G1, B, B1). The illumination device contains at least one primary light source (1) of a first color, the light of which forms a first color channel (R, R1, G, G1, B, B1), and at least one primary light source (1) of a second color, the light of which forms a second color channel (R, R1, G, G1, B, B1), at least one sensor device (3), which is positioned such that it can receive mixed-color light and is suitable for detecting brightness of light of a wavelength range comprising the color channels (R, R1, G, G1, B, B1) and which determines the brightnesses of the different color channels (R, R1, G, G1, B, B1) separately and repeatedly during operation.

Abstract: A lamp 8 has a lamp vessel 16, a portion 58 of which is received in a receiving part 44 of a holding body 4 and fixed by a joining compound 48, wherein a protective layer 60 is applied to the portion 58. A process for producing a lamp of this type is also disclosed.

Abstract: 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: A reflector lamp is disclosed that has an integral lamp, in particular a high pressure discharge lamp, that is surrounded at least partially by a reflector, the reflector being connected to a base via a reflector neck and having a light exit opening. According to the invention, the light exit opening of the reflector is covered at least partially indirectly or directly by a cover disk arrangement that has an optical spectral filter that absorbs or reflects undesired optical spectra.

Abstract: A lamp (10) is disclosed with a single or double-sided socket, whereby a bulb element (11) is arranged on the at least one socket (12), which surrounds a volume of space (14) and said lamp is provided with at least one LED element (13). An irradiation of the LED light into the bulb element occurs and, as a result of reflection, in particular total reflection, on the defining surfaces (16,17) of the bulb element a transmission of the LED light within the bulb element occurs.

Abstract: The operating method is based on the simultaneous use of FM and AM and is distinguished by passing through a number of steps which are used to find an optimum frequency for the AM and, in addition, to define an optimum AM level. An electronic ballast which has a memory module which can be overwritten is used for implementation.

Abstract: High-pressure discharge lamps may explode at the end of their life. In order to be able to predict an explosion, the gradient of the operating voltage is evaluated. If a risk of explosion is detected, the lamp operation is interrupted.

Abstract: The invention relates to a circuit arrangement for detecting a crest factor of a lamp current or a lamp operating voltage of an electric lamp (2), the circuit arrangement having a first subcircuit (15), which is designed to determine an averaged value from an input signal applied to the circuit arrangement, having a second subcircuit (16), which is designed to determine a maximum permissible value from the input signal applied to the circuit arrangement and having a comparator circuit (17), which is designed to produce a comparison signal from the output signal of the first subcircuit (15) characterizing the averaged value and from an output signal of the second subcircuit (16) characterizing the maximum permissible crest factor. The invention also relates to a method for detecting such a crest factor. One further aspect of the invention relates to an electronic ballast (1) which has a circuit arrangement (14a, 14b) according to the invention.

Abstract: A metal halide fill for forming an ionizable fill comprises at least one inert gas, mercury and metal halides, comprising the constituents Na halide, Tl halide, Ca halide and halides of the rare earths. It also comprises Pb halide. This fill may be present in particular in the discharge vessel of a metal halide lamp which has an outer bulb.