Abstract: A first excimer lamp includes: a quartz glass-made light-emitting tube containing an excimer emission gas sealed therein; and a pair of electrodes for generating dielectric barrier discharge. One of the pair of electrodes is disposed in the inner space of the light-emitting tube so as to extend in the direction of a tube axis of the light-emitting tube, and the other one of the pair of electrodes is embedded in the tube wall of the light-emitting tube so as to extend in the direction of the tube axis of the light-emitting tube. The one electrode is electrically connected to a conductive foil hermetically embedded in an end portion of the light-emitting tube.

Abstract: An internal induction lamp with a glass envelope bulb assembly and an inductor shaft assembly. The glass envelope bulb assembly is a hollow glass envelope bulb with a mercury amalgam stem protruding downwards from the bottom of the hollow glass envelope bulb. The mercury amalgam stem is fragile, and protected by a stem protector. The inductor shaft assembly, which inserts into the glass envelope bulb assembly accommodates the protrusion of the mercury amalgam stem along with the stem protector. The inductor shaft assembly and envelope bulb assembly may attach via a threaded ring connector. The inductor shaft assembly may have a heat sink, and a gap within the heat sink to accommodate placement of the stem protector within this gap.

Abstract: A Lucent Waveguide Electromagnetic wave Plasma Light Source has a fabrication of fused quartz sheet and drawn tube. An inner closed void enclosure is formed of 8 mm outside diameter, 4 mm inside diameter drawn tube. Electromagnetic wave excitable plasma material is sealed inside the enclosure. The end plate is circular and has the enclosure sealed in a central bore in it, the bore not being numbered as such. A similar plate is positioned to leave a small gap between the inner end of the enclosure and itself. The two tubes are concentric with the two plates extending at right angles to their central axis. The outer tube extends back from the back surface of the inner plate as a skirt.

Abstract: The present invention relates to a metal halide lamp with a ceramic discharge tube, which includes a ceramic discharge tube and two electrodes. The ceramic discharge tube includes a main discharge tube and two ceramic capillary tubes respectively located at two ends of the main discharge tube, the main discharge tube has a central protuberant part located in the middle thereof and two cylindrical parts respectively connected to two ends of the central protuberant part, the two cylindrical parts are respectively connected to the two ceramic capillary tubes.

Abstract: The invention provides a high intensity discharge lamp comprising a ceramic discharge vessel having sealed first and second end plugs and an external electrical antenna, which is used as “active” antenna for facilitating ignition of the high intensity discharge lamp. The discharge vessel encloses a discharge volume and comprises two electrodes and contains a filling.

Abstract: A Lucent Waveguide Electromagnetic wave Plasma Light Source has a fabrication of fused quartz sheet and drawn tube. An inner closed void enclosure is formed of 8 mm outside diameter, 4 mm inside diameter drawn tube. Electromagnetic wave excitable plasma material is sealed inside the enclosure. The end plate is circular and has the enclosure sealed in a central bore in it, the bore not being numbered as such. A similar plate is positioned to leave a small gap between the inner end of the enclosure and itself. The two tubes are concentric with the two plates extending at right angles to their central axis. The outer tube extends back from the back surface of the inner plate as a skirt.

Abstract: A high-power ceramic discharge metal halide (CDM) lamp with a shroud-type containment assembly is disclosed. The lamp includes: a first shroud (138) with a first wall which forms a cylinder and which defines a first cavity; a second shroud (136) situated within the first cavity and which includes a second wall which forms a cylinder and which defines a second cavity situated within the first cavity of the first shroud; a first coil portion (140, 142) is situated about at least the one or the first and second shrouds (respectively); a ceramic arc tube (102) is situated in the second cavity and includes first and second openings, first and second leads (104, 106) with electrodes, and a lamp cavity (103) for containing a fill.

Abstract: An integrated gas discharge lamp (5) with ignition electronics integrated into the base, comprising an ignition transformer (TIP), an ignition capacitor (CIP), and a controlled switching element (SIP), wherein the integrated ignition electronics are configured to generate an asymmetrical ignition pulse, and wherein the voltage ratio between the first lamp electrode near the base and the second lamp electrode distant from the base ranges from 22:1 to 5:4.

Abstract: A high brightness excimer light source has an elongated tube containing an excimer-forming gas and electrodes for exciting the gas to form a plasma, and thus create excimers such as a rare gas halogen excimer or a rare gas excimer. Light emitted from the excimer propagating axially along the tube passes out of the tube through an exit device such as a lens or optical fiber at one or both ends of the tube.

Abstract: A lamp for receiving at least one light emitting diode as a light-emitting means, having a bottom part as a supporting element and for feeding the electric connecting wires to a mounting device carrying the at least one light emitting diode, and having a lamp shade. The mounting device is a separate mounting substrate having a breaking strength between 100 and 1,000 MPa and is arranged on the bottom of the device.

Abstract: Known mercury-vapor discharge lamps for planar irradiation are provided with a lamp bulb made of quartz glass, which encloses a closed discharge space having a non-linear gas-discharge channel. In order to provide a structurally simple lamp, which also guarantees a highest possible homogeneity of the UV irradiation, even for a small distance to the surface to be treated, the lamp bulb is formed as a quartz-glass chamber defined by straight walls and having bottom, top, and side walls and is divided into sub-chambers by several separating webs made of quartz glass and projecting from the bottom wall to the top wall. These sub-chambers include a front-most sub-chamber and a rear-most sub-chamber and form in series interconnection the non-linear gas-discharge channel. The separating webs extend alternately from one side wall up to close to the opposite side wall, while leaving open a gap connecting adjacent sub-chambers in a fluid-communicating manner.

Abstract: A low pressure Ultra Violet (UV) light source produces a high intensity output proportional to the inside diameter and length of a arc discharge column. The light source includes a cathode and anode contained within a high density ceramic body and a sapphire window mounted in line with the arc discharge column. The anode is in line with the arc column at the end opposite the sapphire window, and the cathode is disposed to an area outside the arc discharge column to which the arc moves through an aperture in the side of the arc discharge column structure. As the electrons move through the low pressure gas ionization of the gas occurs releasing photons in the UV region of the spectrum. The sum of the photons generated at each location along the arc discharge column produces the high intensity UV radiation that exits the lamp through a sapphire window.

Abstract: A compact fluorescent lamp includes a discharge tube such as a spiral discharge tube having a wall forming a discharge chamber between cathodes at first and second ends thereof. At least one auxiliary amalgam assembly is disposed in the discharge chamber at an intermediate region disposed between the first and second ends. The auxiliary amalgam assembly is secured at a location spaced from the inner wall of the discharge chamber.

Abstract: It is intended to enable accurate positioning of an electrode top end such that the arc length is constant and prevent leakage from sealing portions due to bending or twisting of a molybdenum foil upon sealing an electrode mount by heating the sealing portion. For attaining the object described above, a quartz bulb in which extension tubes each having an inner diameter larger than the inner diameter of the opening of a body tube is welded the openings of both ends of a body tube formed with light emitting portion and a sealing portion thereby forming to a positioning step is used, and electrode mounts each formed with a positioning engagement portion at a position spaced apart by a predetermined length from the electrode top end are inserted to engage the positioning engagement portion of the electrode mounts to the positioning step and, in this state, the sealing portions are sealed.

Abstract: An automotive discharge lamp, having an inner tube including a light emitting unit having a first space therein and seal portions formed on the light emitting unit, a discharge medium containing a first gas enclosed in the first space, a metal foil sealed in the seal portions, electrodes with one end connected to the metal foil and other end extended into the first space, and an outer tube connected to the inner tube to form a second space between the outer tube and the inner tube, wherein the second space has a second gas enclosed therein and the oxygen concentration in the second space is 1.0 volume % or less.

Abstract: The invention provides a high intensity discharge lamp comprising a ceramic discharge vessel having sealed first and second end plugs and an external electrical antenna, which is used as “active” antenna for facilitating ignition of the high intensity discharge lamp. The discharge vessel encloses a discharge volume and comprises two electrodes and contains a filling.

Abstract: A high-pressure discharge lamp having a discharge vessel with a central part that bulges out and which defines a lamp axis with a sealing part being attached to each end of the discharge vessel. The shaft of in each case one electrode, comprising a head and a shaft, is sealed in the sealing part, and a capillary tube closely surrounding the shaft of the electrode is between the central part of the discharge vessel and the sealing part. A tubular neck is integrally formed as a component of the discharge vessel between the central part and the capillary tube, and is separated from the shaft.

Abstract: A quick start energy-saving fluorescent lamp comprising a bulb holder assembly, a light tube, a glass shade, a protruding cold end, a thermal insulation glue, and an amalgam vapor source. The protruding cold end is disposed at the front end of the light tube and contacts with the glass shade. The thermal insulation glue is disposed outside and around the cold end. The amalgam vapor source is disposed inside the cold end. The lamp can work at high temperature with low temperature amalgam vapor source and maintain high luminous efficiency, and the lamp can reach the rated brightness quickly. A method for producing the lamp is also provided.

Abstract: The invention relates to the electrotechnical industry. Said invention makes it possible to reduce the production cost of, and improve the quality of, gas-discharge reflector lamps. The inventive gas-discharge reflector lamp comprises a light bulb and a burner arranged on current leads into the bulb. At least one half of the bulb's internal surface is coated with a reflective layer in such a way that a plane crossing the parallel edges thereof is parallel to the longitudinal axis of the burner. The bulb is embodied in the form of an ellipsoid. In the area delimited by the bulb neck and dome, the transversal edges of the reflecting layer are located on the cross-sections where the bulb neck and dome gradually transform into the ellipsoidal section, The plane passing through the longitudinal edges of the reflecting layer are located from the bulb axis at a distance H and falls in the range of 0.04-0.11 of the bulb maximum diameter D.

Abstract: A direct-current high-voltage discharge bulb includes a ceramic arc tube body having a discharge emission chamber at a middle portion in a longitudinal direction thereof, a light-emitting substance which is sealed inside the discharge emission chamber together with a starting rare gas, and an anode and a cathode which are disposed so as to face each other inside the discharge emission chamber. An inside diameter of the ceramic arc tube body where the discharge emission chamber is defined is made to gradually decrease from the anode side to the cathode side.

Abstract: A low power ceramic gas discharge metal halide (CDM) lamp 10 capable of retrofitting into existing low power HPS lamp fixtures, the CDM lamp 10 having an elliptically-shaped ceramic discharge vessel 12 containing a mixture of the rare gases neon and argon at a fill pressure of at least 400 mbar, and a pair of electrodes (17, 18) extending into the discharge vessel 12, the electrodes (17, 18) having an electrode clearance ratio E=D1/D2 of at least 0.36, where D1 is the shortest distance from an electrode (17) tip to the inner wall of the central portion 13 of the discharge vessel 12 and D2 is the distance between the discharge electrodes 17 and 18.

Abstract: A ceramic gas discharge metal halide (CDM) lamp (10) capable of retrofitting into existing high pressure iodide (HPI) metal halide and high pressure mercury vapor (HP) lamp fixtures for significient energy savings, the CDM lamp (10) having a ceramic discharge vessel (12) containing a pair of discharge electrodes (17, 18), a Penning mixture of the rare gases neon and argon, and a chemical fill which includes an oxygen dispenser and which restricts strong oxygen binders to 5 mole percent or less. In a preferred embodiment, the discharge vessel (12) has an aspect ratio R of less than 2, a wall thickness t of up to 1.2 mm, a spacing d between the discharge electrodes (17, 18) of up to 14 mm, and a passive antenna (26) on the outer wall of the discharge vessel (12), with the shortest distance a between a discharge electrode (17, 18) and the floating antenna (26) of up to 7 mm.

Abstract: A discharge lamp and a method for forming the lamp, the lamp including a ceramic discharge vessel defining at least part of a cavity containing a metal halide (MH) chemical filling having a power factor of between about 0.75 and 0.85 located within the cavity; and one or more feedthroughs having first and second ends, the first end located in the cavity. The cavity may have an internal length LINT and an internal diameter DINT that are proportional to each other, such that an aspect ratio defined as LINT/DINT is less than or equal to two. The lamp may be started and operated with a probe-start ballast without an internal igniter circuit or without a starting electrode (or internal igniter).

Abstract: A high intensity discharge lamp, in certain embodiments, includes a uniquely shaped shoulder and dimensions selected to reduce stress and associated cracking. The uniquely shaped shoulder has a variable diameter, such as, e.g., a cup-shaped geometry, a curved funnel-shaped geometry, or a conical-shaped geometry. The selected or optimized dimensions may include a tip-to-neck distance, a tip-to-wall distance, and an internal diameter of the lamp. The selected or optimized dimensions also may include a uniform wall thickness, an arc gap distance, and an electrode thickness. These dimensions and shapes are selected to reduce undesirably high maximum stresses and temperatures in the lamp. As a result, the lamp is able to provide higher performance with a longer life due to a decreased risk of stress cracking during rapid start up and steady state operation.

Abstract: In order to achieve a discharge lamp suited to operate under reduced nominal power of e.g. 20-30 W, a lamp is proposed with two electrodes (24) arranged at a distance in a discharge vessel (20, 120) for generating an arc discharge. The discharge vessel (20, 120) has a filling with a substantially free of mercury and comprises a metal halide and a rare gas. The lamp (10, 110) further comprises an outer bulb (18) arranged around the discharge vessel at a distance (d2). The outer bulb (18) is sealed and has a gas filling of a thermal conductivity (?). The inner diameter (d1) of the discharge vessel is preferably in a range from 2-2.7 mm. The wall thickness (w1) is in a range from 1.4-2 mm. A heat transition coefficient (?/d2) is calculated as thermal conductivity (?) at 800° C. of the outer bulb filling divided by the distance (d2). The so-defined heat 10 transition coefficient is below 150 W/(m2K).

Abstract: A bulb-shaped outer envelope for accommodating at least one lamp including a light-emitting body and a control gear is disclosed. The envelope has a substantially spherical section for receiving the light-emitting body, and an elongated end section for receiving at least a part of the control gear components. The elongated end section is provided with a neck section. A substantially tubular neck-extension portion connects to an inner surface portion of and protruding from the neck section. The neck-extension portion is suitable for accommodating a remaining part of the control gear components. In a method for the manufacture of a glass outer envelope, a flare that is normally used in the manufacture of incandescent lamps is turned around by 180°, put into a skirted bulbous envelope, melted into the envelope while the skirt is detached and the flare is formed into a neck-extension portion. A self-ballasted compact fluorescent lamp with the bulb-shaped outer envelope is also disclosed.

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: An improved germicidal lamp of the type containing mercury, having a ceramic base, and disposed in, and preventing contact with, a transparent quartz sleeve to prevent formation of a cold spot in the germicidal lamp caused by an undesirable thermal transfer between the lamp and the sleeve and which causes condensation of the mercury at the cold spot in the germicidal lamp. The improvement includes the ceramic base having a circumferential groove therearound, and a thermally insulating ring siting in the circumferential groove of the ceramic base so as to prevent the ceramic base from contacting the sleeve to prevent formation of the cold spot in the germicidal lamp caused by the undesirable thermal transfer between the lamp and the sleeve and prevent the condensation of the mercury at the cold spot in the germicidal lamp.

Abstract: The present invention relates to a deuterium lamp with a structure to enable high-accuracy positioning with respect to a mounting object such as an analyzer. The deuterium lamp comprises a sealed container in which a light-emitting portion to emit a discharge light in a predetermined direction is stored. The sealed container is constituted by a hollow body portion in which the light-emitting portion is stored and a hollow guide portion which guides a discharge light from the light-emitting portion to a light exit window provided at its front end. The deuterium lamp further comprises an axis adjusting member fixed to the hollow guide portion while storing at least a part of the hollow guide portion and a sealing layer for fixing the hollow guide portion and the axis adjusting member to each other.

Abstract: A high-intensity discharge lamp includes a discharge vessel made of an insulator, and a cathode and anode. A V-shaped gap is provided between the anode and a first region of the vessel directly adjacent to where the anode separates from an interior surface of the vessel. A secondary cathode is provided on an exterior surface of the vessel at the first region, where the secondary cathode is positioned so that the V-shaped gap and the first region are between the secondary cathode and the anode. An electric field at the first region produces a dielectric barrier discharge (DBD) which generates ultraviolet (UV) and vacuum ultraviolet VUV photons that impinge on the cathode and initiate a breakdown between the cathode and anode.

Abstract: A xenon short arc lamp which has a middle section with a length to diameter ratio greater than 1.6 and which is directly interchangeable with a xenon short arc lamp of the same wattage in a lamphouse without modifying the lamphouse.

Abstract: A high-pressure discharge lamp with an axial symmetry axis and metal halogenide filling has electrodes with shafts designed as pins with a diameter of 0.5 to 1.15 mm. The halogen for the halogenide is composed of iodine and possibly bromine components, iodine being used alone or in combination with bromine, and the bromine/iodine atomic ratio amounting to maximum 2.

Abstract: The invention relates to a metal halide lamp for a vehicle headlamp comprising a cylindrically-shaped discharge vessel (23) having a ceramic wall which encloses a discharge space comprising Xe and ionizable filling, and a cylindrically-shaped outer bulb (21) surrounding the discharge vessel (23). According to the invention a portion (25, 26) of the surface of the outer bulb (21) facing away from the discharge vessel (23) is shaped as a negative lens. Preferably, the portion (25, 26) encompasses a segment of the outer bulb (21) with a segment angle ? in the range between 30???60°. Preferably, the portion (25) forming the negative lens is shaped as a flat surface.

Abstract: The invention relates to a novel compact fluorescent lamp with a helical discharge tube 2 and a tube piece 8 which is fitted to it and can serve to accommodate an Hg source 14 and also as an exhaust tube, and to a corresponding production process.

Abstract: A lighting device comprises a serpentine shaped CCFL, a driver driving the CCFL, a connector that allows the device to connect to and receive power from conventional power sockets, and a fixture that connects them into a single device. Such device can be used for general lighting purposes and replaces incandescent and other fluorescent lamps in current use without having to change electrical sockets. The fixture mechanically connects the CCFL, the driver and the connector to form an unitary mechanical structure. Preferably an air gap is maintained between the CCFL and the driver.

Abstract: A T8 fluorescent lamp can comprise a light-transmissive glass envelope, means for providing an electrical discharge to the glass envelope, a phosphor layer within the glass envelope and a discharge-sustaining fill gas inside the glass envelope. The phosphor layer can comprise phosphors of a type for producing a daylight lighting spectrum or of a type for producing a tungsten/halogen lighting spectrum. The fill gas can comprise a mixture of argon and neon. In a particular mode of operation, the T8 lamp can operate at a power of at least 45 watts. In another mode of operation, the T8 fluorescent lamp can operate at a power of approximately 70 watts. A lighting fixture can comprise an array of such T8 fluorescent lamps arranged substantially side-to-side on longitudinal centerlines that are less than one and one-half inches apart. In a particular instance, the fixture can have been retrofitted from having been outfitted to accommodate T12 lamps.

Abstract: A low-pressure mercury vapor discharge lamp has a lamp envelope enclosing, in a gastight manner, a discharge space provided with a filling of mercury and a rare gas. The lamp envelope includes electrodes for maintaining a discharge in the discharge space. The lamp envelope transmits UV-light and is made of a black glass component. The composition of the black glass component is free of PbO and comprises, expressed as a percentage by weight, the following constituents: 65-70% by weight of SiO2, 1.4-2.2% by weight of Li2O, 1.5-2.5% by weight of Na2O, 11-13% by weight of K2O, 1.8-2.6% by weight of MgO, 2.5-5% by weight of CaO, 2-3.5% by weight of SrO, 8-9.5% by weight of BaO, 0.2-0.4% by weight of CoO, and 1.7-3.25% by weight of NiO.

Abstract: An ultraminiature light source using a double-spiral shaped tungsten filament includes end contact portions which are separated to allow for radial and length-wise unwinding of the spiral. The double-spiral filament is spaced relatively far apart at the end portions thereof so that contact between portions of the filament upon expansion is avoided. The light source is made by fabricating a double-spiral ultraminiature tungsten filament from tungsten foil and housing the filament in a ceramic package having a reflective bottom and a well wherein the filament is suspended. A vacuum furnace brazing process attaches the filament to contacts of the ceramic package. Finally, a cover with a transparent window is attached onto the top of the ceramic package by solder reflow in a second vacuum furnace process to form a complete hermetically sealed package.

Abstract: A mercury-free gas discharge lamp suitable in particular for motor vehicles has an enhanced discharge arc diffuseness. The lamp according includes an inner vessel and/or outer bulb with a structured arrangement or pattern such that the discharge arc diffuseness of the lamp is increased, such as by 0.01 mm to 1.5 mm.

Abstract: An electrodeless lamp assembly includes a tubular lamp envelope, at least one core having a closed-loop body disposed so as to surround a core mounting portion of the tubular lamp envelope. The core includes an indented coil winding section formed by an indentation formed in an inner side section of the closed-loop body adjacent to a centrally located opening. The electrodeless lamp assembly further includes an induction coil wound around the indented coil winding section of the core.

Abstract: In order to achieve a discharge lamp suited to operate under reduced nominal power of e.g. 20-30 W, a lamp is proposed with two electrodes (24) arranged at a distance in a discharge vessel (20, 120) for generating an arc discharge. The discharge vessel (20, 120) has a filling with a substantially free of mercury and comprises a metal halide and a rare gas. The lamp (10, 110) further comprises an outer bulb (18) arranged around the discharge vessel at a distance (d2). The outer bulb (18) is sealed and has a gas filling of a thermal conductivity (?). The inner diameter (d1) of the discharge vessel is preferably in a range from 2-2.7 mm. The wall thickness (w1) is in a range from 1.4-2 mm. A heat transition coefficient (?/d2) is calculated as thermal conductivity (?) at 800° C. of the outer bulb filling divided by the distance (d2). The so-defined heat 10 transition coefficient is below 150 W/(m2K).

Abstract: A gas-discharge lamp (1) is described having an inner envelope (2) comprising a discharge vessel (3) and two tubular sections (6, 7) arranged on the discharge vessel (3), having two electrodes (4, 5) that project from the tubular sections into the discharge vessel (3) and that, to enable them to be supplied with power, are electrically connected to respective electrical conductors (10, 11) that extend through their associated tubular sections (6, 7) and that are enclosed in the tubular sections (6, 7) with a gastight seal along a sealing section (8, 9) and having an outer envelope (18) that surrounds the discharge vessel (3), with an airtight seal, while leaving an outer cavity (20) between itself and the discharge vessel (3) and that is filled with a gas at a pressure of not more than 1,000 mbar.

Abstract: A method of detecting a leak in an outer jacket of a metal halide lamp having an arc tube inside the outer jacket and operated by a ballast, where the ballast monitors an electrical characteristic of the lamp during start and detects a leak in the outer jacket when the electrical characteristic deviates from that of a corresponding metal halide lamp whose outer jacket does not have a leak. The electrical characteristic is one of six markers, namely (1) V?(E) at a predetermined E, where V?(E) is a derivative of lamp voltage V as a function of cumulative energy E delivered to the ballast since ignition, (2) a value of E at which V?(E) reaches a maximum, (3) V at a predetermined E, (4) a local maximum of V?(E) up to a predetermined E, (5) a global maximum of V?(E), and (6) E required to achieve a predetermined V.

Abstract: The elongate inner bulb (1) defines a longitudinal axis (A) and is sealed at mutually opposing ends by sealing parts (6; 32), an outer bulb being placed, with an adjoining tube piece, over the inner bulb and being fixed to the sealing part by means of an annular beading formed there, the end of the tube piece being radially attached to the beading, the maximum inner diameter of the beading being larger than the outer diameter of the sealing part in the region of the beading.

Abstract: The hot re-strike time of a high wattage (150 W or greater) ceramic discharge metal halide (CDM) lamp is reduced by: (a) increasing the ratio A of the diameter (D2) of the outer bulb (1) to the inner diameter (ID) of the discharge vessel (3); or (b) filling the outer bulb with an inactive gas such as nitrogen, helium, neon, argon, krypton or xenon; or by implementing both (a) and (b). The hot re-strike time can be further reduced by combining (a) and/or (b) with (c), the addition of a getter metal for iodine, such as Sc, Ce or Na, to the discharge vessel (3).

Abstract: A gas discharge lamp (1) with a discharge vessel (2), a first electrode (3) projecting into the discharge vessel (2), and a second electrode (4) projecting into the discharge vessel (2) is described. The first electrode (3) is connected to an electrically conductive first conductor surface (5) surrounding the discharge vessel (2). The second electrode (4) is connected to an electrically conductive second conductor surface (6) surrounding the discharge vessel (2) and arranged such that it overlaps the first conductor surface (5) so as to form a capacitance (C).

Abstract: A metal halide arc discharge lamp (10) having a lamp envelope (12) and an arc tube (14) mounted within the envelope; a shroud (20) surrounding the arc tube (14); electrical lead-ins (26, 28) for supplying electrical energy to the arc tube (14); and a chemical fill within the arc tube to produce light when an arc is formed within the arc tube; the improvement comprising: the shroud (20) having a given thickness T and a given inside diameter ID having a relationship such that T is less than 2 mm and ID/T is less than 22.

Abstract: A low-pressure mercury discharge lamp includes: an arc tube made by winding a glass tube into double spiral configuration; a holding member that is in a form of a cylinder with a closed bottom and is for holding the arc tube; an electronic ballast for lighting the arc tube; a case in a cone form for covering the electronic ballast by being fit to a circumferential wall of the holding member; and a globe covering the arc tube. When an inner diameter of the arc tube is represented as Di mm, and tube wall loading of the arc tube is represented as L W/cm2, rectangular coordinates (Di, L) are confined within a range defined by points of: (2.5, 0.31), (4.0, 0.35), (5.5, 0.30), (6.5, 0.19), and (2.5, 0.01).

Abstract: A ceramic gas tight high-pressure burner includes an ionizable filling. The burner further includes a discharge vessel having a discharge cavity with a volume in the range of 3 mm3 to 30 mm 3, and an internal filling pressure of the discharge cavity in the range from 0.1 MPa to 4 MPa at room temperature. An end closure of the burner may be designed as a three-part, a two-part or a one-part end closure device with a reduced crevice.

Abstract: In order to achieve a discharge lamp suited to operate under reduced nominal power of e.g. 20-30 W, a lamp is proposed with two electrodes (24) arranged at a distance in a discharge vessel (20, 120) for generating an arc discharge. The discharge vessel (20,120) has a filling with a substantially free of mercury and comprises a metal halide and a rare gas. The lamp (10, 110) further comprises an outer bulb (18) arranged around the discharge vessel at a distance (d2). The outer bulb (18) is sealed and has a gas filling of a thermal conductivity (?). The inner diameter (d1) of the discharge vessel is preferably in a range from 2-2.7 mm. The wall thickness (w1) is in a range from 1.4-2 mm. A heat transition coefficient (?/d2) is calculated as thermal conductivity (?) at 800° C. of the outer bulb filling divided by the distance (d2). The so-defined heat 10 transition coefficient is below 150 W/(m2K).