Abstract: The invention relates to a light source for generating light having a spectral emittance in at least a part of the range of 380 nm to 780 nm, the light having a spectral power distribution E(?) as a function of the wavelength ?, and a general color-rendering index Ra, wherein the ratio of the integral spectral power distribution over a first range of 575 nm???650 nm to that of a second range of 380 nm???780 nm is given by the relation: and wherein Bb, ?0.15 and Ra?20. The light generated by the light source has a relatively small disturbing effect on migrating birds, while it still allows acceptable visibility for human beings.

Abstract: Optical faceplates and methods for manufacturing same are disclosed. An optical faceplate (10) includes a substrate (12) having a major surface, and an array (15) of optical fibers embossed on the substrate. The optical fibers have a length determined in accordance with a layer of material deposited on the substrate from which the optical fibers are formed, a depth of the features in a mold or stamp and a number of processing/stamping steps. A method includes forming (202) a layer on a substrate having a major surface, and processing (204) the layer to form an array of optical fibers transversely disposed to the major surface.

Abstract: A cooling device for cooling a light-emitting semiconductor device, such as a LED device (20), comprises a ceramic plate (15) having coolant-conveying channels (12) incorporated therein. The ceramic plate (15) is adapted for forming an integral part of the optical system of the light-emitting semiconductor device (20) and to cool a light-emitting portion (26) of the light-emitting semiconductor device (20). A method of forming a cooling device comprises the steps of forming a charge of ceramic particles, embossing the charge with a stamp to form coolant-conveying channels in the charge, hardening the charge, and providing a cover on top of the channels to seal them.

Abstract: The invention describes a Light engine (1,2,3,4,5) comprising a chamber (6) with at least one aperture (7) and a number of LED elements (13) positioned inside this chamber, where effectively all inner surfaces of the chamber (6) are realized as high-reflective surfaces (20) which are essentially non-absorbing towards light within a desired wavelength region

Abstract: The invention relates to a light source for generating light having a spectral emittance in at least a part of the range of 380 nm to 780 nm, the light having a spectral power distribution E(?) as a function of the wavelength ?, and a general color-rendering index Ra, wherein the ratio of the integral spectral power distribution over a first range of 575 nm???650 nm to that of a second range of 380 nm???780 nm is given by the relation: and wherein Bb, ?0.15 and Ra?20. The light generated by the light source has a relatively small disturbing effect on migrating birds, while it still allows acceptable visibility for human beings.

Abstract: An electric lamp has a light-transmitting lamp vessel (1) in which a light source (2) is arranged. At least a portion of the lamp vessel is provided with an interference film (5) for allowing passage of visible-light radiation and reflecting infrared radiation. The interference film has either a first plurality of alternating layers of Si02 and TiO2 or a second plurality of alternating layers of SiO2, TiO2 and Ta2O5. The TiO2 layers in the first plurality of alternating layers have a geometrical thickness of at most 75 nm by inserting relatively thin Si02 interlayers into the TiO2 layers, and the SiO2 interlayers have a geometrical thickness of at least 1 nm and at most 7.5 nm. The TiO2 layers in the second plurality of alternating layers have a geometrical thickness of at most 25 nm by inserting relatively thin Ta2O5 interlayers into the TiO2 layers, and the Ta2O5 interlayers have a geometrical thickness of at least 1 nm and at most 5 nm.

Abstract: A cooling device for cooling a light-emitting semiconductor device, such as a LED device (20), comprises a ceramic plate (15) having coolant-conveying channels (12) incorporated therein. The ceramic plate (15) is adapted for forming an integral part of the optical system of the light-emitting semiconductor device (20) and to cool a light-emitting portion (26) of the light-emitting semiconductor device (20). A method of forming a cooling device comprises the steps of forming a charge of ceramic particles, embossing the charge with a stamp to form coolant-conveying channels in the charge, hardening the charge, and providing a cover on top of the channels to seal them.

Abstract: The present invention relates to a light emitting device (10) comprising at least one inorganic light emitting diode (LED) (14) for emitting primary light, a luminescent plate (12) supporting on a first side the LED(s), which plate is adapted to convert the wavelength of at least part of said primary light from the LED(s), and light scattering means for coupling out light from the luminescent plate. The invention makes it possible to omit any bulky extraction optics, and allows for a flat and compact LED module design. The present invention also relates to a method for the manufacture of such a light emitting device.

Abstract: The invention describes a Light engine (1,2,3,4,5) comprising a chamber (6) with at least one aperture (7) and a number of LED elements (13) positioned inside this chamber, where effectively all inner surfaces of the chamber (6) are realized as high-reflective surfaces (20) which are essentially non-absorbing towards light within a desired wavelength region