Abstract: A light source module includes a substrate made with a recess portion formed on one face and an unformed portion not having the recess portion formed therein; a light emitting diode disposed on the recess portion of the substrate; a pair of power supply members disposed on the unformed portion of the substrate; and a connecting portion formed on the substrate and connecting the light emitting diode and the pair of power supply members. A part of an end edge of the recess portion conforms to a part of a side edge of the substrate.

Abstract: A light emitting device includes first and second substrates facing each other, and a sealing member interposed between the first and second substrates. The sealing member includes a first supporting frame having a groove portion and a second supporting frame having an end inserted into the groove portion, and an external surface of an end of the second supporting frame, inserted into the groove portion, is surrounded by the first supporting frame.

Abstract: A laminated flat lamp and its manufacturing process, including: two walls in a form of first and second glass sheets held parallel to each other and sealed by an inner seal, defining an internal space including an electrically supplied visible and/or ultraviolet light source; a first electrode associated with a first glass sheet and a second electrode associated with the first or the second glass sheet; at least another glass sheet, as a first glass backing, joined to the first sheet via a plastic interlayer film; and a peripheral seal made of a polymeric material masking the groove external to the seal and extending beyond the edges of the first and second glass sheets.

Abstract: An assembly for an electric lamp with an elongated inner bulb, which is sealed at two ends, the inner bulb including a lamp axis, and a light-emitter-being accommodated in the inner bulb, the inner bulb being surrounded by an outer bulb, wherein the outer bulb is substantially circular-cylindrical, and includes two parts, at least one part having a rounded-off, sealed first end, and the two parts each having an open second end, which ends are matched to one another in terms of diameter, and the parts being connected to one another in the region of the open end via a certain sealing path, the inner bulb being held in the outer bulb via two frame wires, which are passed out of the outer bulb between the two parts.

Abstract: An induction lamp includes a bulb enclosing an induction coil and having a threaded base. The threaded base is electrically connected to the induction coil without an electrically intermediate frequency generator disposed between the threaded base and the induction coil. An induction lamp fixture includes a female threaded electrical bulb socket and a frequency generator convertor unit 50-60 Hz A/C electricity to a sufficient frequency to illuminate an induction bulb. A method for retrofitting a light fixture includes connecting an output of a frequency generator having an input receiving 50-60 Hz A/C electricity, to a female threaded electrical bulb socket.

Abstract: The present invention is related to an OLED display, and one aspect of the OLED display includes a substrate member, an insulating layer formed on the substrate member, a metal wire formed on the insulating layer and having a plurality of joining enhancement holes, a sealant formed on the metal wire, and a sealing member attached on the sealant. In some embodiments, the joining enhancement holes efficiently suppress stripping of the sealant from the metal wire, since the sealant can integrally bond with the interlayer insulating layer through the joining enhancement holes. This feature may compensate for any weak bonding adherence between the sealant and metal wire. In some embodiments, the area of the joining enhancement holes may range from about 5% to about 60% of the entire area of the metal wire.

Abstract: An automotive headlamp bulb provides the two light or three filament sources in a single bulb. One source may be used to generate a standard headlamp beam, while the second source may be used to generate an augmenting side beam in response to a turning signal. A similar third filament may provide an augmenting beam to the opposite side, or farther to the same side. The single bulb eliminates the need for a second bulb, or a second reflector in an advanced headlamp system with turning light augmentation.

Abstract: A spontaneous break in a glass tube can be sufficiently suppressed in a hot cathode low pressure discharge lamp. A hot cathode low pressure discharge lamp (10) includes a glass tube (1) in which a filament (2) is arranged. The glass tube (1) has a cross section that is flat in configuration, and a flattening x and a thickness ratio T satisfy the below expression, where the flattening x is a ratio A/B between a major diameter A and a minor diameter B of the cross section of the glass tube, the thickness ratio T is a ratio t/A between a thickness t of the glass tube and the major diameter A of the cross section of the glass tube, a=?0.809, b=0.728, c=?3.46, d=?0.0689, e=0.926, and f=?2.12.

Abstract: The invention relates to a lamp (8), in particular a vehicle lamp, having a base (17), a burner (7) having a light-generating element (11, 12), and an adapter plate (1) having a connecting region (2) and a receiving portion (3), the connecting region (2) being connected to the base (17) and the receiving portion (3) to the burner (7). The adapter plate (1) has cutouts (4) between the connecting region (2) and the receiving portion (3) such that the connection region (2) is no longer rigid but has a certain flexibility.

Abstract: A vibration resistant, energy efficient lamp (10) that is suitable for, for example, ceiling fan operation where vibration is always a concern. The lamp (10) comprises an envelope (12) of a suitable transparent glass, for example, a borosilicate glass, having a substantially spherical upper body (14) with a given diameter D, a substantially cylindrical waist (16) having a diameter W of about 38% of the given diameter; a neck portion (18) having a diameter N of about 31 to about 32% of the given diameter and a threaded base (20) having a diameter B of about 25 to 27% of the given diameter. The base (20) has a skirt portion (22) adjacent the neck portion having diameter S substantially equal to the neck portion (18) diameter N and larger than the diameter B of the base (20).

Abstract: A lamp with a base at one end, in particular a high-pressure lamp, with a light bulb sealed in a vacuum-tight fashion, with the latter being surrounded by an outer bulb and an enveloping part, with a base supporting firstly the outer bulb and secondly the enveloping part, having the following features: a) the base has a base insulator which is produced from an insulating material and has a central opening which holds the outer bulb; b) the base insulator has a circular segment with a plateau; c) the enveloping part has a circular opening with a radially projecting edge which has a lower and upper contact face relative to the base on the base side, the lower contact face of the edge fitting together with the upper plateau of the circular, radially projecting segment on the base insulator; d) the enveloping part is attached to the base insulator by a cement-free mechanical holding mechanism, with an annular damping element being inserted between enveloping bulb and base insulator.

Abstract: An LED light bulb device including a bulb body, a cap and an LED assembly. The bulb body defines an exterior surface and an interior. The cap is mounted to the bulb body, combining to define a light bulb-like structure. The LED assembly includes a substrate, LEDs, transformer circuitry and connective circuitry. The LEDs and the connective circuitry are maintained by the substrate, with the connective circuitry electrically connecting the LEDs and the transformer circuitry. The transformer circuitry is adapted to modify incoming power for powering the LEDs. The LED assembly is mounted to the light bulb-like structure such that the LEDs are disposed along the exterior surface of the bulb body, with light from the LEDs being directed inwardly into the interior and then outwardly from the interior. The LED assembly can further include a heat sink body encompassing the LEDs.

Abstract: A method of making a carbon nanotube structure includes forming a plurality of carbon nanotubes and contacting the carbon nanotubes with a polymer. A solid composition is formed from the carbon nanotubes and polymer and then shaped. For example, the solid composition can be shaped into an elongated structure such as a filament, wire, rope, cable, and the like. In at least some instances, at least some, or all, of the polymer is removed from the solid composition after it is shaped.

Abstract: [Objects] The object of present invention, in regard to a lamp with outer bulb, is to attach an outer bulb to the attaching member of a base by simple and convenient fabrication, and prevent reliably detachment of the outer bulb from the attaching member. [Meaning] An outer peripheral surface of a supporting post 9 formed to an attaching member 6 of a base 4 and an inner peripheral surface of an outer bulb 5 define a gap therebetween for filling a heat resistant adhesive or filler S, convex portions 13, 14 facing the gap 12 are formed to the outer peripheral surface of the supporting post 9 and the inner peripheral surface of the outer bulb 5 respectively, and a joint body J for joining the outer bulb 5 and the supporting post 9 is cast in mold being defined with the outer peripheral surface of the supporting post 9 and the inner peripheral surface of the outer bulb 5 by means of the adhesive or filler S filled in the gap 12.

Abstract: The invention relates to a lamp for a light system, which lamp comprises at least: a lamp envelope (1) in which at least one electrical radiant source is enclosed and from which project at least two current supply means, a lamp base (2) that has at least one part by which the lamp envelope is fixed to the lamp base, and a reference element (3, 4) that is arranged on the lamp base wherein the material of the part of the lamp base by which the lamp base (2) is fixed to the lamp envelope (1) is composed of a plastics material or a mixture of plastics materials that is resistant to high temperatures.

Abstract: The light source has external electrical power supply lines which are held in contact pins in the cap. The connection is made by crimping, with the electrical power supply line in each case having a plurality of notches.

Abstract: Provides are a light emitting apparatus and a light unit having the same. The light emitting apparatus comprises a light emitting device comprising a light emitting element and a plurality of external leads, and a plurality of electrode pads under the light emitting device.

Abstract: A high-pressure discharge lamp has an outer envelope (1) in which a discharge vessel (11) is arranged. The discharge vessel encloses a discharge space (13) with an ionizable filling. The discharge vessel has two mutually opposed neck-shaped portions (2,3) through which current supply conductors (4,5) extend to a pair of electrodes (6,7) in the discharge space. A lamp base (8) of electrically insulating material supports the discharge vessel. The lamp base also supports the outer envelope (1). The outer envelope encloses the current supply conductors and is connected to the lamp base in a gas-tight manner. By controlling the atmosphere in the outer envelope, a simplified and compact high-pressure discharge lamp is provided with an accurate positioning of the discharge vessel with respect to the optical axis of the lighting system. The high-pressure discharge lamp can be suitably applied in an assembly with a reflector.

Abstract: The invention proposes a lamp (1), in particular a halogen incandescent lamp for system voltage, having a luminous element (8), which is retained by pinches (10a, 10b) which are in the form of funnel-shaped turned-in sections in the end face (3) of the lamp vessel (2), the pinches (10a, 10b) being oriented essentially axially with respect to the longitudinal axis of the lamp (1).

Abstract: The invention relates to a discharge vessel of a quartz glass for discharge lamps with a diffusion barrier inner layer of silicon oxide, which as a single layer is applied and/or is generated on the inner surface as well as to a method for generating and/or applying such a diffusion barrier inner layer and to the use of such a discharge vessel.

Abstract: A universal mounting supports high intensity LEDs in a lighting fixture with heat removal and electrical connection facilities. A holder includes a peripheral sidewall defining a cavity for accepting a printed circuit board assembly. A support member supports the printed circuit board assembly along the peripheral sidewall. Electrical contact elements are provided the printed circuit board. A thermal conduction member is in thermal communication with the printed circuit board assembly. The receptacle portion removably engages with the holder portion. A plurality of contact sockets conductively engages the electrical contact elements of the holder portion to interconnect the contact elements to external wires. An aperture in the receptacle portion accepts the thermal conduction member, wherein the thermal conduction member passes through the aperture and into a space for dissipating heat from the printed circuit board.

Abstract: An electric discharge lamp is provided. The electric discharge lamp includes a ceramic luminous tube; electrodes held by the ceramic luminous tube; a first outer tube which is made of glass and covers the ceramic luminous tube to form a first space between the ceramic luminous tube and the first outer tube; and a second outer tube which is made of glass and covers the first outer tube to form a second space between the first outer tube and the second outer tube. A vacuum is formed in the first space.

Abstract: Provided herein is a light-emitting apparatus which is capable of causing the light emitted at the entire face of a fluorescent material to be exteriorly emitted with no interference and with enhanced light emission efficiency, thereby attaining an exteriorly radiated high brightness light. A cathode electrode 10 is mounted on a periphery of a transmission member 30, the anode electrode 15 is also mounted on a domain opposite to a light transmission member 30, and the surface 16a of the fluorescent material 16 to be mounted on a top layer of the anode electrode 15 is formed with a concave face.

Abstract: Disclosed is a glass composition composed of an oxide glass wherein the percentages of constitutional elements other than oxygen (O) expressed in atomic % are as follows: boron (B) is not less than 56% and not more than 72%; silicon (Si) is not less than 0% and not more than 15%; Zinc (Zn) is not less than 0% and not more than 18%; potassium (K) is not less than 8% and not more than 20%; and the total of K, sodium (Na) and lithium (Li) is not less than 12% and not more than 20%. This glass composition further may contain at least one of magnesium (Mg), calcium (Ca), strontium (Sr) and barium (Ba) in an amount of more than 0% and not more than 5%, and molybdenum (Mo) and/or tungsten (W) in an amount of more than 0% and not more than 3%.

Abstract: The invention relates to a high temperature material modified to exhibit enhanced IR emittance in the wavelength range where a black body operating at the same high temperature exhibits peak emittance, to a light-transmissive body comprising the high temperature material, to a high intensity lamp comprising the high temperature material, and to a method of preparing the same.

Abstract: The invention relates to a lamp (1), particularly a mains-operated halogen lamp, comprising a luminous element (8) that is fixed at least at one mounting point by means of exactly one funnel-shaped recess, i.e. a knob (10a-10d), which is formed from the lamp vessel (2). Each knob (10a-10d) extends substantially perpendicular to the longitudinal axis (L) of the lamp (1).

Abstract: A sealing glass substrate that allows control of adhesion width and ready cutting of the glass substrate without extending the cutting position in a process of manufacturing organic EL displays by sealing and cutting an organic EL substrate containing one or more organic EL (electroluminescent) display parts. The sealing glass substrate seals an organic EL substrate that includes one or more organic EL laminates. The sealing glass substrate is formed of a glass plate and includes one or more recesses each opposing one of the organic EL laminates. An adhesion region surrounds each recess, and an adhesion escape groove surrounds each adhesion region. The recesses and adhesion escape grooves are of substantially equal depth.

Abstract: A glass package is disclosed comprising a first substrate and a second substrate, where the substrates are attached in at least two locations, both attachments comprising frits, and wherein the frits comprise a glass portion comprising: a base component comprising and at least one absorbing component. Also disclosed is a method of sealing a light emitting display device comprising providing a light emitting layer, a first substrate and a second substrate, where a frits are deposited between the substrates, and where the frits are sealed with a radiation source.

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: A vibration resistant, energy efficient lamp (10) that is suitable for, for example, ceiling fan operation where vibration is always a concern. The lamp (10) comprises an envelope (12) of a suitable transparent glass, for example, a borosilicate glass, having a substantially spherical upper body (14) with a given diameter D, a substantially cylindrical waist (16) having a diameter W of about 38% of the given diameter; a neck portion (18) having a diameter N of about 31 to about 32% of the given diameter and a threaded base (20) having a diameter B of about 25 to 27% of the given diameter. The base (20) has a skirt portion (22) adjacent the neck portion having diameter S substantially equal to the neck portion (18) diameter N and larger than the diameter B of the base (20).

Abstract: An objective is to provide a compact self-ballasted fluorescent lamp which can reduce occurrence of a short circuit without protecting lead wires extending from each end portion of a spiral arc tube. To achieve the objective, a pair of connection pins is provided on a circuit board of the compact self-ballasted fluorescent lamp, near a periphery of the circuit board so as to oppose another pair of connection pins formed near the periphery. In this way, the pairs of connection pins can be respectively provided directly above the end portions of the spiral arc tube. Thus, lead wires extending from each of the end portions can be connected to a corresponding one of the pairs of connection pins with a relatively short distance. This prevents the lead wires from being in contact with the circuit board, thereby reducing occurrence of a short circuit.

Abstract: A reversible base for a lamp can reduce the number of parts needed for differing lamp assemblies. The preferred base is an insulating body with a first receptacle for a lamp capsule including a cavity, and a second receptacle. The second receptacle is aligned in opposition to the first receptacle, being similar in size and shape. A support is positioned between an end of the first receptacle and an end of the second receptacle and extends radially from a mid-region between the first and second receptacles. The support includes a radially extending flange having a face and a sidewall. Electrical contacts are held on the support, and may be axially aligned pins extending from the face of the flange. The pins may be electrically extended for coupling in either the first or second receptacle to lamp leads.

Abstract: An optical member comprising OD-doped silica glass, optionally doped with fluorine. The optical member is particularly advantageous for use in connection with radiation having a wavelength shorter than about 248 nm. In certain embodiments the optical member can be advantageously used for wavelength as short as about 157 nm.

Abstract: A lamp comprising a light-transmissive envelope, the inner surface of which is only partially coated by a reflective barrier coating layer such that an aperture is created in the coating for light emission, the lamp exhibiting asymmetric light output through the aperture and lumens substantially equivalent to a lamp wherein the envelope inner surface is completely coated with a reflective barrier coating layer having no aperture, and a laser ablation process for creating the reflective barrier coating layer aperture.

Abstract: The invention relates to a lamp having a light source (10) and a sub-assembly comprising a protective sleeve (1) and two frame members, wherein the two frame members (2, 3) are each supporting the sleeve. Each frame member may comprise a clamping spring, which serves as a connection between the frame member and the sleeve. The invention also relates particularly to a lamp with an outer vessel (45), which is a parabolic aluminized reflector, and a light source, which is a ceramic discharge metal halide burner.

Abstract: An arc tube is formed by a glass tube that is turned at a substantially middle thereof and wound around a spiral axis from the middle, to have a double-spiral structure. End portions of the arc tub are wound around the spiral axis. A holder has insertion openings formed therein in such shapes that correspond to shapes of the ends of the arc tube. The insertion openings allow the ends of the arc tube to be inserted along a bottom wall of the holder. The holder also includes guide grooves provided in the areas before the insertion openings in the spiral direction of the ends of the arc tube. The guide grooves allow the end portions of the arc tube to come in contact, and when the arc tube is rotated around the axis, guide the ends of the arc tube to the insertion openings.

Abstract: A metal halide lamp includes a translucent air tight vessel having a light emitting tube portion with an internal discharge space, and sealing portions formed on both sides. A discharge medium in the discharge space contains at least metal halide and rare gas. A pair of electrodes, one ends of which are sealed at sealing portion and the other end of which are arranged in the discharge space facing each other. The discharge space has a nearly circular shape in a cross section perpendicular to the tube axis and has a structure in which the discharge medium is accumulated between the electrodes. The light emitting tube portion has a wall thickness of a lower portion thinner than that of an upper portion. The metal halide lamp has a high luminous efficiency, a quick rise of light flux and an easy manufacturing ability.

Abstract: An electronic ballast circuit for a handheld fluorescent task lamp, comprising a self-starting electronic driver circuit operated by a power supply and operable to start and run at least first and second compact fluorescent bulbs from a single output; first and second receptacles for connecting the first and second bulbs to the single output; and a bulb accommodation circuit in the electronic driver circuit that enables operation of the electronic ballast circuit with either starter or non-starter type fluorescent bulbs and with either one or both bulbs.

Abstract: A ceramic arc tube for high intensity discharge (HID) lighting applications is provided wherein the arc tube contains a high buffer gas pressure. A method and apparatus for making the arc tube are also provided wherein RF induction heating is used to melt a frit material to form a hermetic seal.

Abstract: A compact self-ballasted fluorescent lamp includes a double-spiral arc tube formed by winding a glass tube to its both ends around a spiral axis, and sealing electrodes each having a filament coil at the ends of the glass tube, and a holding member that has a closed bottom and holds the arc tube. The holding member has, at its end wall, insertion openings through which the ends of the glass tube are inserted. The ends of the glass tube are inserted to such positions that enable the filament coils to be positioned within the holding member, and the minimum distance L, in the insertion direction of the ends of the glass tube, between the filament coil and the edge of the insertion opening of the holding member is 6 mm.

Abstract: A new fluorescent lamp comprises a lamp tube and an electronic ballast, it is characterized in that it is provided with an outer tube, there are respectively an outer plug at both ends of the outer tube, in which inserts a socket for the lamp tube. The electronic ballast is between the outer plug and the socket for the lamp tube at one end, said lamp tube is disposed between two sockets for the lamp tube.

Abstract: A bulb-type fluorescent lamp has a case having an open end portion for housing a lighting circuit therein, an arc tube extending outside through the open end portion of the case, and a globe having an open end portion for housing the arc tube therein. An adhesive is supplied to the inner surface of the open end portion of the case at four circumferentially spaced areas, and the open end portion of the globe is inserted into the open end portion of the case. As a result, the globe is fixed to the case with the adhesive.

Abstract: This invention is related to a lamp bulb with optical pattern, which consists of a bulb body, a filament and a conducting wire. The filament in the bulb body was conducted out from the tail of the bulb body by the conducting wire. The head of the bulb body is a solid, the outside is a convey arc and the inside is a triangle. The filament is connected to the conducting wire in a straight line. The bulb of the present invention has a higher luminosity and can use fully the light emitted from the filament. Because of the special structure in the bulb body, the light beam emitted by the bulb forms beautiful patterns. For example, it can form directly eye-shaped or solar eclipse-like aureola halo patterns.

Abstract: A high intensity discharge (HID) headlight structure according to the invention includes a light bulb base and a light tube. One end of the light bulb tube is provided with a positioning base consisted of an upper cover and an accommodating washer. The light tube is fastened in the light bulb base via the positioning base. An interior of the light tube is provided with a light source having a positive electrode and a negative electrode. An exterior of the light source is a light capsule as a formed integral. The positive and negative electrodes are penetrated to an exterior via two ends of the light capsule. One electrode of the positive and negative electrodes, after being penetrated out of the light capsule, is bent by two times, connected with a conductor, and accommodating by an accommodating tube.

Abstract: An incandescent automotive lamp having a glass envelope with a polyetherimide sleeve attached to a press-sealed end of the glass envelope. The sleeve includes a base portion having an interior passage that permits the sleeve to be slid onto the press-sealed end. Attached to the base portion of the sleeve are a pair of opposed locking members, with each locking member having a free, cantilevered end located near the bottom side of the base portion. When the sleeve is assembled onto the press-sealed end of the glass envelope, the free end engages an associated bearing surface on the press-sealed end which inhibits the sleeve from sliding back off the glass envelope. The polyetherimide sleeve is capable of withstanding relative high temperature operation of the lamp without outgassing of the plastic, and the locking members allow secure attachment of the sleeve to the glass envelope without cracking of the polyetherimide material.

Abstract: A circular fluorescent lamp comprises a light-transmitting circular tube, filled with a discharge gas including mercury and a rare gas, having an outer diameter between about 14 mm and 18 mm. A phosphor layer is coated on the inner surface of the light-transmitting circular tube. A stem seals each end of the light-transmitting circular tube air-tightly, and holds a pair of conductive wires. One of the ends of each pair are connected to a filament, and the other of the ends extend outwardly from the circular tube. A lamp base is arranged between the ends of the light-transmitting circular tube so as to rotate slightly around the center axis of the circular tube and includes conductive pins, which are connected to the conductive wires. An insulator, arranged between at least one pair of the conductive wires, limits the movement of the conductive wires. The circular fluorescent lamp may be used for a lighting fixture.

Abstract: The present invention provides a metal halide lamp having a ceramic arc tube vessel that includes a discharge arc tube member and thin tube members, the discharge arc tube member including taper parts and a main tube part in the middle in a longitudinal direction, the taper parts and the main tube part having a larger outside diameter than an outside diameter of ends of the discharge arc tube in a longitudinal direction, and the thin tube members each being fit to the respective ends of the discharge arc tube, where a minimum curvature radius R is set to be 0.3 mm or more at each transitional area of an external surface between each taper part and a corresponding end of the discharge arc tube.

Abstract: The present invention relates to a decorative bulb of a series connected light string. The bulb is provided with at least one outer conductive fuse connected with two conductive wires to obtain a promised conductive purpose when the bulb is burned out. The light string can still work by use of the outer conductive fuse decorative bulb of a series connected light string.

Abstract: Low-pressure gas discharge lamp provided with a discharge vessel (1) enclosing a discharge space provided with a gas filling in a gastight manner, the discharge vessel (1) having tubular end portions each with a capacitive coupling element (2) made from an electrically insulating material for producing and maintaining a discharge in the discharge space. The lamp is structurally confined to prevent the occurrence of (hair) cracks in a wall of the discharge vessel as a result of piezoelectric properties of the electrically insulating material.

Abstract: This invention concerns a compact fluorescent lamp with a double helix shaped discharge tube in which the two strands of the helix are constituted by two helix shaped tube portions. These tube portions define a central axis of the discharge tube. The double helix formed by the discharge tube has a central section and a first end section. These sections are defined along the central axis, and the lamp base for receiving ends of the tube portions is disposed at the first end section. An inner diameter of the central section of the helix is larger than an inner diameter of the first end section. The invention further relates to a method and apparatus for manufacturing coiled shaped discharge tubes, in particular the above described discharge tube of the discharge lamp. A radially segmented molding core is used for manufacturing the discharge tube.