Abstract: A single-ended glass halogen lamp includes an infrared reflecting shroud surrounding a lamp filament which reflects infrared energy back to the lamp filament to heat the filament and improve overall lamp efficiency. The shroud is supported within the lamp enclosure by the electrical leads which connect the lamp filament to a source of electricity. The optical interference filter is preferably a tantala-silica coating formed on an exterior of an ellipsoidal shaped shroud.

Abstract: A modular lamp assembly and method of assembling same is provided. The modular lamp assembly includes a lamp/ballast subassembly and a reflector which is positioned in a space provided between the lamp and the ballast. The reflector is unassembled in relation to the lamp and the ballast so that if the lamp or ballast are defective, the reflector may be readily removed from the subassembly and placed between a lamp and ballast of a replacement subassembly. The lamp/ballast subassembly, including the reflector, are held in place within a housing by sandwiching the ballast and the reflector between interior surfaces of the housing and a housing cover which contains an opening aligned with the lamp.

Abstract: There are provided a decomposition apparatus by emission of a UV light which is irradiated from an excimer lamp, a decomposition method thereof and an excimer lamp and an excimer emission apparatus which may suitable be used for a decomposition apparatus and a decomposition method of an organic compound. The decomposition apparatus comprises an excimer lamp emitting UV light for decomposing the organic compound and a decomposition container provided with the excimer lamp for decomposing the organic compound in a liquid or a gas. In the decomposition apparatus, since the UV light irradiated from excimer lamp is emitted to the liquid or the gas, the organic compound in the liquid or the gas can be decomposed easily by the simple decomposition apparatus and method.

Abstract: A mount assembly for supporting the arc tube of a lamp within an outer envelope has first and second axially aligned banding straps. Each of the straps has a closed crimp section and an open crimp section. The straps are positioned so that an open crimp section of one strap overlies a closed crimp section of the other strap, thereby equalizing tensions when the crimps are closed. The mount assembly includes also a mount frame comprised of two elongated rods which are affixed to the banding straps. The straps are mounted upon the glass stem of the lamp.

Abstract: A halogen bulb is composed essentially of a tubular halogen bulb having two conductive ends, a thick hollow glass envelope and a socket for holding securely the tubular halogen bulb in the thick hollow glass envelope. The thick glass envelope has a thickness ranging between about 2 mm and about 8 mm, which is made integrally or made of two component parts joined together. The thick hollow glass envelope may be provided with protuberances perpendicular to an outer surface opposite to the socket, and/or ventilation holes to reduce the temperature of the double-enveloped halogen bulb at work. The socket may be provided with one or more ventilation holes at the closed end thereof. A bracket is used inside the thick hollow glass envelope for holding the tubular halogen bulb such that the tubular halogen bulb is perpendicular to the longitudinal axis of socket.

Abstract: The invention relates to an electric luminaire having a luminaire housing 0, 11) and at least one low-pressure discharge lamp (12) as well as an operating device for operating the at least one low-pressure discharge lamp (12), the operating device having lamp-side (19a) and line-side electric terminals (19e, 19f) for supplying voltage to the at least one low-pressure discharge lamp (12) and to the operating device. According to the invention, the at least one low-pressure discharge lamp (12) is fastened to the luminaire housing (10) with the aid of an adhesive means (13), preferably by means of a double-sided adhesive tape. Moreover, according to the invention the at least one low-pressure discharge lamp (12) is uncapped and has a plurality of supply leads (14a, 14b, 14c, 14d) which project from its discharge vessel and are connected according to the invention in each case to one of the lamp-side electric terminals (19a) of the operating device.

Abstract: A lamp apparatus for producing a beam of light that can be used as a part of a source for a projection system. The lamp apparatus of the present invention produces a beam of light originating from a small aperture. The apparatus includes an electrodeless lamp body in the form of elongated outer tube having a hollow interior. An inner sleeve fits or is deposited inside the outer tube, the inner sleeve having a fill containing generally cylindrically or spherical shaped bore. The sleeve provides temperature resistant and reflection properties. Electrodes positioned either internally or externally of the lamp body are provided for producing radio frequency energy that excite the fill contained in the bore of the inner sleeve to form a plasma light source of intense heat. The light thus generated by the plasma in a relatively large volume is constrained to exit through a small aperture at either one, or both, ends of the apparatus.

Abstract: A linear double ended lamp can be modified into a number of non-linear arrangements by heating selected regions of the lamp ends to the softening temperature and bending the lamp ends to a desired angular configuration. Preferably, the lamp ends are bent across the sealing foil that is hermetically sealed to the lamp envelope. One or both ends of the lamp can be bent as desired to define a variety of configurations. According to the method of forming the bent double ended lamp, selected regions of the lamp are raised above the softening temperature while the remainder of the lamp is maintained at a lower temperature. Preferably, the lamp ends are bent along an axis offset and parallel to the longitudinal axis of the lamp to prevent accumulation of material.

Abstract: A plasma-based generator for use with a power source including a plasma tube having a hollow tube body in which a plasma is generated by the power source; a first support structure supporting a downstream end of the plasma tube; and a second support structure holding an upstream end of the plasma tube, the second support structure connected to the first support structure, the second support structure including an expansion joint which changes its length to accommodate a lengthening and a shortening of the plasma tube due to its thermal expansion and contraction when plasma processing is performed within the plasma tube.

Abstract: An image display apparatus includes a display panel formed by arranging in juxtaposition a face plate carrying thereon a phosphor and a rear plate carrying thereon electron-emitting devices within a housing. The phosphor is so arranged as to be irradiated with electrons emitted from the electron-emitting devices to display images. The image display apparatus further includes an air blower for causing air to flow between the display panel and the housing.

Abstract: The capped high-pressure discharge lamp has a discharge vessel having opposite neck-shaped portions. A tubular glass sleeve envelopes the discharge vessel and has constrictions coupling the sleeve to a respective neck-shaped portion. The sleeve has an end-portion adjacent a constriction at the side thereof which is remote from the other constriction, in which end portion a pinch is present. A clamping member having lugs which hold the pinch is secured to a mounting member which is fixed to a cap. The pinch provides for a mechanically strong portion to secure the discharge vessel to the cap. The construction is able to withstand heavy shocks which may occur during transport.

Abstract: In a metal halide arc discharge lamp having a light emitting arc discharge tube surrounded by a heat absorbing, light transmissive shroud hermetically sealed within an outer lamp envelope, more nearly isothermal operation of the arc tube surface is achieved by using a shroud having a geometry (e.g., a hollow frustum of a cone) such that the shroud is closer to the cooler portions of the arc tube than to the hotter portions. At steady state lamp operation, the shroud absorbs heat emitted by the arc tube and radiates a portion of the absorbed heat back to the arc tube. By having a shroud geometry and spacing such that the inner surface of the shroud is closest to the coolest portions of the arc tube and furthest away from the hottest portions of the arc tube, the shroud radiates more heat back to the cooler portions, thereby providing more nearly isothermal operation of the surface of the arc tube than can be accomplished with a coaxial, cylindrical shroud or no shroud.

Abstract: A gas plasma display panel heater device for use with a gas plasma panel display, and methods for using and mounting the same. The gas plasma display panel has a display viewing area, external connection and heather. The gas plasma display heater device includes a thermally conductive layer, preferably a foil or coating, arranged and configured to substantially envelop the gas plasma display panel while not covering the display viewing area. The gas plasma display heater device is operative to conduct heat generated by the heater to other portions of the gas plasma display panel. The plasma display heater further includes a supplemental heater device. The supplemental heater device includes a heating element which is formed from an electrically resistive material such that, when a current is passed through the heating element, the same will generate heat. The supplemental heater also has electrical leads electrically connected with the heating element.

Abstract: A light bulb cooling jacket is adapted to confine a light bulb in a space through which cooling liquid, such as water, may be circulated. The light bulb cooling jacket includes an shell having a rim, the rim defining an opening in the shell. A stopper fits in the opening in the shell and seals against the rim of the shell. The stopper has an aperture in it. The aperture is adapted to receive a portion of a light bulb, which is held and sealed in place in the aperture. The means employed to hold the bulb in place is adapted to engage a generally cylindrical portion of the light bulb, such as the neck of a standard 1000 W bulb. An important characteristic of the present invention that follows from this construction is that the light bulb cooling jacket may be used with a variety of standard high intensity light bulbs. Ports are provided in the stopper for introducing and withdrawing cooling liquid from the space enclosed by the shell and the stopper.

Abstract: A high pressure discharge lamp is disclosed. The high pressure discharge lamp includes: a discharge tube which is filled with gas; a first electrode having a first end, the first electrode being provided in the discharge tube; and a second electrode having a second end which is positioned away from the first end by a certain distance, the second electrode being provided in the discharge tube. In the high pressure discharge lamp, arc discharge is induced by a voltage applied between the first end of the first electrode and the second end of the second electrode. The high pressure discharge lamp further includes a convection regulating member which is electrically insulating and provided in the discharge tube. The convection regulating member suppresses the deformation of the arc discharge caused by the convection of the gas in the discharge tube.

Abstract: To simply and reliably retain a heat retention tube or sleeve (10) within envelope (1) and surrounding the arc tube or discharge vessel (4) of the lamp, end regions of the heat retention or conservation tube are pinched around current supply leads (7) which pass through the pinch or press region (11). To prevent dislocation of the tube or sleeve (10), axially as well as rotationally with respect to the arc tube, the current supply leads are deformed in the region of the pinch or press (11), for example by being flattened or deflected in a bend or V-shape from a straight wire. An exhaust tube (12) can be passed through the pinch (11) if the pinch extends across the entire diameter of the heat retention tube; otherwise, the pinch need only extend over a portion thereof, thus providing for pneumatic communication between the interior of the heat retention tube and the envelope (1).

Abstract: An additional capacitance in the form of a molding (12") composed of dielectric material is inserted in an inner space of an ultraviolet light excimer radiator, making it possible to enforce loss-free control of the axial and/or radial distribution of the power consumption and ultraviolet light intensity. In the irradiation of wide substrates such as sheets, papers, and the like coated with paint, lacquers or adhesives, in particular, this measure is advantageous if all the regions of the substrate are to be irradiated with approximately the same dose.

Abstract: A discharge tube for emitting light of the present invention includes an inner bulb including a hollow portion for defining therein an arc discharge chamber which encloses therein gas for emitting light, the inner bulb further including a pair of electrodes and a pair of metal members each of which is connected to a corresponding one of the pair of electrodes, the pair of electrodes being projected in the arc discharge chamber from the inner bulb and the pair of metal members being projected outwardly of the inner bulb, the hollow portion having an outer diameter of a first value and an outer tube for sealingly enclosing therein the inner bulb, the outer tube including a small-diameter portion having an outer diameter of a second value which is equal to or smaller than the first value, wherein the inner bulb is held in the interior of the outer tube, with a gap being formed between an outer surface of the inner bulb and an inner surface of the outer tube, in such a manner that the outer tube supports the meta

Abstract: In a UV high-power radiator, a plurality of dielectric tubes (6) having internal electrodes (7) are disposed in the interior of a quartz housing having rectangular cross section. The interior of the housing is filled with a filling gas which emits UV radiation under discharge conditions. The electrical supply is provided in such a way that the discharges (17) develop between adjacent dielectric tubes (6). A notable feature of this construction is its compactness, economical nature and service friendliness.

Abstract: In order to be able in the case of UV high-power omni-directional radiators to direct the generated radiation only in a preferred direction, and to avoid shading by the inner dielectric tube (2), the outer electrodes (4) are arranged only on a part of the circumference of the outer dielectric tubes (1). In this way, the object to be irradiated or the substance to be irradiated can thus be arranged directly in the range of emission of the discharges (7).

Abstract: In the cooling of UV high-power radiators, the cooling of the inner electrodes (5) which are at high tension potential is critical insofar as it is necessary to use fully demineralized water or oil for this purpose. Since a cooling body (9) must in any event be employed for the external cooling, this cooling body is utilized at the same time as heat exchanger for the internal cooling.

Abstract: The invention provides a ceramic electric-discharge lamp having a pinch-sealer which is set to an end of an outer envelope and covered by a base having a pair of base pins projecting themselves into the base. The outer envelope is in vacuum, in which an arc tube composed of a square U-shaped tube is installed. Apertures of both ends of the square U-shaped illuminant are closed by ceramic discs each containing an electrode. Linear illuminant is formed in such regions where the radius of curvature of the square U-shaped arc tube greatly varies, in other words, between the curved portions.

Abstract: The invention relates to a high-pressure sodium discharge lamp provided with a discharge vessel having a ceramic wall and enclosed with intervening space by an outer bulb. The discharge vessel is provided with two electrodes whose respective tips have a mutual distance D. The discharge vessel has a substantially circular cross-section with an interior diameter d.sub.i over the distance D. Under nominal operating conditions, according to the invention, the wall has a wall load of at least 60 W/cm.sup.2, the space between the outer bulb and the discharge vessel contains a gas filling, and D/d.sub.i being >6.

Abstract: Heat transfer means are disclosed to remove heat from a fused quartz arc tube being employed as the light source in an electric discharge lamp. The heat removal is carried out during lamp operation with a fused quartz protuberance that cooperates to remove heat being conducted through the arc tube walls. Various lamp embodiments are disclosed whereby such fused quartz protuberance is physically disposed adjacent the hot spot region of the arc tube in a xenon-metal halide lamp.

Abstract: In a traveling wave tube, an electron beam collector and an electrically insulating cylinder having good thermal conductivity and dielectric strength are arranged in a bore of a cooling housing to improve heat elimination from the electron beam collector. The cylinder is deformable in a radial direction, is of an elastic material, and is dimensioned so that it fixes the electron beam collector in the bore of the housing with a tight fit.

Abstract: A coupled-cavity delay line for a traveling-wave tube which includes a device for focusing an electron beam along the axis of the delay line for interaction between the electron beam and an electromagnetic wave propagating along the delay line. The focusing device includes an alternate series of permanent magnets and pole pieces which confine resonant cavities on each side. Each of the pole pieces is common to a pair of adjacent cavities and is provided with a drift tube which is positioned at a center thereof and which has a central aperture for passage of the electron beam. Each of the pole pieces is also pierced by at least one intercavity coupling aperture. The delay line also comprises a heat transfer member provided in at least one of the pole pieces to extend from the drift tube to the outside of the pole piece. This heat transfer member is made of a material such as copper having a heat conductivity higher than that of a pole piece.

Abstract: A high-efficacy, high power ultraviolet radiation lamp is disclosed. Electrodes are respectively provided at two ends of a discharge tube, and at least a rare gas is sealed in the discharge tube. The discharge tube is curved in a U shape. A reservoir for reserving a radiant material for radiating ultraviolet rays projects from the discharge tube. An isolating section is provided to surround at least the reservoir. The isolating section adjusts the temperature of the reservoir and supplies an appropriate amount of radiant material into the discharge tube.

Abstract: Discharge tube apparatus includes an outer containing vessel and a structure comprising for example five metal cylinders located co-axially within it. Each of the metal cylinders includes projecting spacers on its outer surface which serve to space it from adjacent ones. Such a structure is thermally insulating and may be arranged to enable a large temperature difference to be maintained between the interior of the discharge tube and the outer containing vessel. In other embodiments, a plurality of structures are included disposed along the axis of the tube. Also, dispenser segments for dispensing part of the active medium of a metal vapor laser may be included and arranged to shield vulnerable surfaces in the tube from direct exposure to the discharge.

Abstract: A magnetron apparatus comprises a magnetron with an anode cylinder, and a radiator having an integral construction and attached to the outer peripheral surface of the anode cylinder so as to allow cooling air to pass therethrough. The radiator includes a plurality of horizontal plates arranged in stages and each having a cylindrical portion for receiving the anode cylinder, and a pair of vertical walls which connect adjacent ends of the horizontal plates, the vertical walls serving to maintain, between adjacent horizontal plates, a gap which is greater than the axial length of the cylindrical portion. The radiator, which has an integral construction of cooling plates; can be installed on the anode cylinder of the magnetron easily in such a manner to ensure a close contact between the radiator and the anode cylinder.

Abstract: A high intensity discharge lamp having an inner tube in which a discharge takes place to produce visible light and ultraviolet radiation and an outer envelope which blocks harmful ultraviolet radiation. A mechanical switching element is provided to extinguish the discharge when the outer envelope is broken.

Abstract: A projector lamp comprising a single ended metal halide discharge lamp in a generally spherical reflector has been found to exhibit turbulence when running. The resulting fluctuation of light especially when used in conjunction with the reflector to concentrate the light for studio or theatre applications provides an apparent movement which is extremely disturbing to the eye. It has been found the turbulent movement of gas around the electrodes in the lamp envelope can be regularised by the application of a magnetic field to the envelope. The turbulence is sensitive to conditions within the discharge arc tube and the strength and position of the magnetic field has to be variable to cater for this. The magnetic field is conveniently applied by an electro-magnet using lamp current.

Abstract: A fluorescent lamp is described in which spontaneous excimer UV emission in an inner tube results from reacting an inert gas molecule with a halide molecule in the excited state. The UV emission travels through the inner tube envelope to an outer tube and is absorbed by a fluorescent material, i.e., phosphor, to produce visible light which passes through the outer tube envelope. The halide may be supplied by metal halide pellets or liquid droplets, which when heated by an initial discharge through an inert gas, produces metal halide vapors which dissociate and combine with the inert gas (Xe, Ar, Ne, Kr) in the excited state and result in UV excimer emission.

Abstract: A tungsten-halogen electric lamp having permeable means closing an outer envelope. Such non-hermetic means may be relatively free-breathing or weather-tight. Tungsten-halogen lamps with permeable means may be manufactured more simply and economically than those currently available.

Abstract: The pinch seal (12) of an electric lamp (11) is kept during operation at a lower temperature by a metal envelope (10), space between this metal envelope (10) and faces of the pinch seal (12) being filled with a heat-conducting mass comprising metal fibers. A considerable temperature decrease is obtained when the spaces between the oppositely arranged major surfaces (13) of the pinch seal (12) and the metal envelope (10) are filled with metal fibers.

Abstract: For the glow discharge between a receptacle and a workpiece, the glow discharge path is connected in series with a first switch. A capacitor circuit is charged via the glow discharge path and two diodes. By closing a switch, the previously positive pole of the capacitor circuit is set to the zero potential, whereby the potential of the other pole is shifted negative. By closing a switch, the capacitor circuit is discharged through the glow discharge path while the first switch is closed. Upon the discharging of the capacitor circuit, the supply voltage continues to be present at the glow discharge path for the remaining pulse time. In the initial range, the voltage pulses have a pulse peak for ignition followed by a maintenance range, the height of which corresponds to the supply voltage.

Abstract: A high-pressure discharge lamp comprising a discharge vessel (3) enclosed by an outer envelope (1) provided with a neck (10) which is adjoined by a sleeve (20) of a lamp cap (2). The lamp cap (2) accommodates an electrical circuit provided with a semiconductor switching element (26) which controls the discharge current in the operating condition of the lamp. The semiconductor switching element (26) is provided with a cooling member (24) which is preferably secured to the sleeve (20). This lamp may be used without further expedients in combination with a stabilization ballast not adapted to the lamp.

Abstract: An electric lamp having a relatively high outer-envelope to inner-envelope wall-thickness ratio whereby the risk of a containment failure of the lamp is substantially eliminated. In an alternate embodiment, the outer envelope has a concave top. In another embodiment, the neck of the outer envelope has a relatively thick wall. Lamps having a wall-thickness ratio falling within the prescribed range, i.e., approximately equal to or greater than 3, have the property that the outer envelope will contain shards of the inner light-source capsule in the unlikely event such inner capsule should burst.

Abstract: A low-pressure mercury vapor discharge lamp having a lamp envelope (1) which encloses a folded tubular discharge vessel (2), the discharge vessel being provided with an appendix (6) which is kept at a relatively low temperature by a heat shield (7) located within the lamp envelope. The heat shield shields the outer wall surface of the appendix from the outer wall of the discharge vessel. The cooler appendix serves to maintain the mercury vapor pressure at an optimum value during operation of the lamp.

Abstract: A coupled-cavity delay line for traveling-wave tubes is provided with a cooling system which permits heat distribution along the entire length of the delay line and ensures that the outer surface of the vacuum enclosure is isothermal. The cooling system consists of a cylindrical sleeve containing heat pipes. The cylindrical sleeve is located between the external wall of the resonant cavities and the permanent magnets. The heat pipes are disposed at uniform angular intervals within the double-walled sleeve and extend lengthwise along the delay line.

Abstract: A high pressure metal (sodium) vapor lamp comprises an outer vitreous envelope and an inner ceramic arc tube supported within it. The arc tube contains vaporizable metal in excess of the quantity vaporized in operation and the heat balance determines a cold spot whereat excess metal collects. The temperature of the cold spot determines the vapor pressure and the voltage drop across the lamp which must lie between specified limits. A thermal link is provided to a metal member such as the exhaust tube, the heat loss from which influences significantly the temperature of the cold spot. In completed lamps measuring too low in voltage, such thermal link may be partly severed without breaking open the outer envelope in order to raise the voltage. One convenient way utilizes an auxiliary wire which is cut by aiming a laser beam at it. Another convenient way to reduce the conductive cross section of the thermal link is to use a laser to drill one or more holes through a metallic member comprising the thermal link.

Abstract: A high pressure arc discharge lamp comprises an elongated arc tube disposed substantially axially within a concave shaped outer jacket.

Abstract: A microwave device of the magnetron type comprises an anode block with straps which are located with respect to one another along the axis of the block and are electrically connected to respective vanes of resonators of the block, these vanes having like polarity at the .pi.-mode of oscillations. The anode block is provided with cooling channels adapted to cool the vanes of the resonators and straps, said channels communicating with at least one chamber designed to distribute a liquid coolant and with at least one chamber designed to collect the liquid coolant, said chambers being rigidly connected with the anode block and provided with a hydraulic coupling between them. The straps of the anode block are implemented in the form of ring-like tubes.

Abstract: A delay line for a high frequency tube that is cooled by circulating fluid.The cooling fluid circulates in a duct (FIG. 3, 10), formed in the space between two sleeves (8 and 9). The sleeves are of non-magnetic material, impervious to the cooling fluid, and have an axis parallel to the axis of the delay line. The first sleeve (8), is vacuum tight, brazed or hard soldered to dielectric supports (2) and, in cross section connects two adjacent supports in a straight line. The second sleeve (9), is cylindrical, and contains the first sleeve to which it is brazed at several points. A focusing device made of permanent magnets is mounted on the second sleeve.The invention will find use in high frequency tubes.

Abstract: High-pressure discharge lamps, having a sealed discharge vessel surrounded by a sealed glass envelope, are known in which an oxidizable metal foil (e.g. of molybdenum) is located, in the space between the vessel and the envelope substantial on the axis of the vessel and is electrically in series with the discharge path. If the envelope is fractured for any reason and the lamp is subsequently ignited, the temperature of the foil is increased due to the discharge current passing through it. The foil is oxidized, and hence fractured, by the air which has permeated said space and the lamp is, extinguished. Such oxidation and fracture normally takes about ten minutes. In accordance with the invention, the foil (14) in the space between the envelope (1) and vessel (2) is arranged close to the wall of the vessel adjacent to an electrode (6) so as to be heated mainly by heat generated in the vessel. This reduces the fracturing time to about one minute.

Abstract: An HID lamp has a very positive acting and simple resilient safety switch positioned proximate the inner surface of the bulb portion of the protective outer envelope and in contact therewith which maintains the switch in a closed position. When the envelope is shattered, the closed switch will open to break the electrical path to the arc tube, thereby rendering the lamp inoperative.

Abstract: A mechanical safety switch for high intensity discharge lamps designed to open and remove the current from the arc tube to extinguish the discharge when the lamp envelope is broken in which a leaf spring switch arrangement is used comprising two leaf spring members which are in contact along a substantial portion of their lengths to thereby reduce the current carrying requirement per unit area of the leaf springs.

Abstract: Magnetically focussed tube having a gate cooler separate from the anode cooler and of higher power capacity than previous magnetically focussed tubes. Other structural features include simplified anode and cooling jacket and heat barrier at ends of cathode.

Abstract: A lamp changing module for totally enclosing a lamp when the module is withdrawn from a support such as an illuminator cabinet, and permitting exposure of the lamp when properly installed and connected to the support. A potentially explosive lamp is thereby contained within the module when it is removed so that even if it explodes it will not harm nearby personnel. It also protects personnel from burn hazards associated with lamp changing.

Abstract: An HID lamp utilizes a thin, fragile, strip-like conductor member affixed to and carried on a portion of the inner surface of the lamp protective envelope. Upon breakage of the protective envelope, the fragile conductor will break and interrupt the electrical continuity of the lamp's electrical circuit, thereby rendering the lamp inoperative.

Abstract: A light fastness and weather resistance testing apparatus which has a testing tank, a hollow shaft rotatably mounted in the center of the testing tank, a sample frame mounted on the hollow shaft and extending beyond one end of said hollow shaft, a motor connected to the shaft for rotating the shaft, a tube of electrically conductive metal extending through the hollow shaft and having one end at the space within the sample frame and a supply of cooling liquid connected to the other end of the tube for supplying a cooling liquid to the tube. A xenon lamp is in the space within the sample frame and has a cooling device mounted thereon constituted by a single wall cylindrical tube of an ultraviolet transmissive glass around the lamp and spaced therefrom, the low voltage end of the lamp being mounted on the one end of the metal tube and having the low voltage terminal thereof electrically connected to the metal tube, the other end of the glass tube having a drainage tube connected thereto.