Abstract: A luminaire is provided, the luminaire is fitted with a decorative element (3) that is simple to exchange for a user without the need for additional tooling. Further, a range of optical structures (2) are provided that enable the user to easily tailor the light distribution generated by his luminaire without having to purchase an entire new luminaire.

Abstract: A luminaire is provided, the luminaire is fitted with a decorative element (3) that is simple to exchange for a user without the need for additional tooling. Further, a range of optical structures (2) are provided that enable the user to easily tailor the light distribution generated by his luminaire without having to purchase an entire new luminaire.

Abstract: A dielectric barrier discharge, DBD, lamp device comprises a toroid shaped discharge chamber (10) having a discharge chamber wall (12). The discharge chamber wall comprises a tubular inner wall section (14), a tubular outer wall section (16), and two ring-shaped end wall sections (18, 20). Each of the end wall sections extend between an end of the outer wall section and an end of the inner wall section. A high voltage electrode (22) is provided at an outer surface of the outer wall section of the discharge chamber wall. A low voltage electrode comprises an electrically conducting fluid surrounded by the inner wall section of the discharge chamber wall. The DBD lamp device may be part of an optical fluid treatment device.

Abstract: A dielectric barrier discharge, DBD, lamp device comprises a toroid shaped discharge chamber (10) having a discharge chamber wall (12). The discharge chamber wall comprises a tubular inner wall section (14), a tubular outer wall section (16), and two ring-shaped end wall sections (18, 20). Each of the end wall sections extend between an end of the outer wall section and an end of the inner wall section. A high voltage electrode (22) is provided at an outer surface of the outer wall section of the discharge chamber wall. A low voltage electrode comprises an electrically conducting fluid surrounded by the inner wall section of the discharge chamber wall. The DBD lamp device may be part of an optical fluid treatment device.

Abstract: A low-pressure gas discharge lamp includes a gas discharge vessel having a gas filling with a discharge-maintaining composition. At least part of a wall of the discharge vessel is provided with a luminescent material including a first UV-B phosphor containing, in a host lattice, gadolinium(III) as an activator and praseodymium(III) as a sensitizer.

Abstract: The present invention relates to a fluorescent lamp including a visible radiation and/or UV-radiation transmissive discharge vessel, at least one luminescent layer coated onto the inner wall of the discharge vessel for converting UV-radiation to other wavelengths of UV-A, UV-B and/or visible radiation characterized in, that at a section to which no luminescent layer is applied on the inner surface area of said discharge vessel at least one substrate layer is applied on the outer surface of this area of said discharge vessel, and/or at least a section to which luminescent layer is applied on the inner surface area of said discharge vessel at least one substrate layer is applied on the outer surface of this area of said discharge vessel; whereby said substrate layer comprises at least one volatile organic material being releasable over an extended time period, whereby the volatile organic material is released by UV-radiation and/or thermal heat generated from said fluorescent lamp and, whereby at operation the

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 identification system for a light radiation source (103) having a control circuit (107) for communicating with an identification circuit (108) associated with the light radiation source, wherein the identification circuit is arranged for storing data relating to the light radiation source. During operation, the control circuit communicates with the identification circuit via a signal path comprising at least a portion of a first electric wire (112) provided for energizing the light radiation source such that it is used as a first transmitting antenna for communicating with the identification circuit. The operation of the light radiation source is controlled in dependence on the data retrieved from the identification circuit. Depending on the result of the identification, operation of the light radiation source can be authorized or prevented, thus blocking the use of an incorrect radiation source for a given application.

Abstract: The present invention relates to glow-switch starters 1, lighting devices therewith and use thereof. The glow-switch starter 1 is suitable for use with three phase supply voltages substantially higher than the common 230V supply voltage 26. This allows more efficient gas discharges in e.g. fluorescent lamps 20, and/or more lamp power, and/or less energy losses in ballasts 22 and lamp electrodes. To make the glow-switch starter suited for such use, according to the invention, the gas filling 5 of the starter 1 is adapted. An important criterion is that the glow current in the steady state operation of the fluorescent lamp that is started by the starter is small enough to prevent closing of the (bimetallic) switch.

Abstract: The low-pressure mercury vapor discharge lamp has a lamp envelope (10) enclosing, in a gastight manner, a discharge space provided with a filling of mercury and a rare gas. The lamp envelope comprises discharge means 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. The low-pressure mercury vapor discharge lamp is preferably used in an apparatus for treatment with radiation for personal care.

Abstract: The present invention relates to a fluorescent lamp including a visible radiation and/or UV-radiation transmissive discharge vessel, at least one luminescent layer coated onto the inner wall of the discharge vessel for converting UV-radiation to other wavelengths of UV-A, UV-B and/or visible radiation characterized in, that at a section to which no luminescent layer is applied on the inner surface area of said discharge vessel at least one substrate layer is applied on the outer surface of this area of said discharge vessel, and/or at least a section to which luminescent layer is applied on the inner surface area of said discharge vessel at least one substrate layer is applied on the outer surface of this area of said discharge vessel; whereby said substrate layer comprises at least one volatile organic material being releasable over an extended time period, whereby the volatile organic material is released by UV-radiation and/or thermal heat generated from said fluorescent lamp and, whereby at operation the

Abstract: An identification system for a light radiation source (103) having a control circuit (107) for communicating with an identification circuit (108) associated with the light radiation source, wherein the identification circuit is arranged for storing data relating to the light radiation source. During operation, the control circuit communicates with the identification circuit via a signal path comprising at least a portion of a first electric wire (112) provided for energizing the light radiation source such that it is used as a first transmitting antenna for communicating with the identification circuit. The operation of the light radiation source is controlled in dependence on the data retrieved from the identification circuit. Depending on the result of the identification, operation of the light radiation source can be authorized or prevented, thus blocking the use of an incorrect radiation source for a given application.

Abstract: The present invention relates to glow-switch starters 1, lighting devices therewith and use thereof. The glow-switch starter 1 is suitable for use with three phase supply voltages substantially higher than the common 230V supply voltage 26. This allows more efficient gas discharges in e.g. fluorescent lamps 20, and/or more lamp power, and/or less energy losses in ballasts 22 and lamp electrodes. To make the glow-switch starter suited for such use, according to the invention, the gas filling 5 of the starter 1 is adapted. An important criterion is that the glow current in the steady state operation of the fluorescent lamp that is started by the starter is small enough to prevent closing of the (bimetallic) switch.

Abstract: A tanning device is described by which the bluish light emitted by mercury vapor lamps is converted into yellow or white light. For this purpose, the mercury lamps, or the sheets of transparent plastics material covering these lamps, are doped or coated with one or more organic or inorganic fluorescent dyes that partially absorb the blue light emitted by the mercury lamps and convert it into light of wavelengths of 550 to 650 nm.

Abstract: The invention relates to a low-pressure gas discharge lamp provided with a gas discharge vessel comprising a gas filling with a discharge-maintaining composition, wherein at least part of a wall of the discharge vessel is provided with a luminescent material comprising a first UV-B phosphor containing, in a host lattice, gadolinium(III) as an activator and praseodymium(III) as a sensitizer, which lowpressure gas discharge lamp is further provided with means for generating and maintaining a low-pressure gas discharge Such a lamp is particularly useful for narrow-band UV-B phototherapy. The invention also relates to a UV-B phosphor containing, in a host lattice, gadolinium(III) as an activator and praseodymium(III) as a sensitizer.

Abstract: A tanning device is described by which the bluish light emitted by mercury vapor lamps is converted into yellow or white light. For this purpose, the mercury lamps, or the sheets of transparent plastics material covering these lamps, are doped or coated with one or more organic or inorganic fluorescent dyes that partially absorb the blue light emitted by the mercury lamps and convert it into light of wavelengths of 550 to 650 nm.