Abstract: The invention relates to a luminescent converter (10, 12) for a phosphor-enhanced light source (100, 102, 104). The luminescent converter comprises a first luminescent material (20) configured for absorbing at least a part of excitation light (hv0) emitted by a light emitter (40, 42) of the phosphor-enhanced light source, and for converting at least a part of the absorbed excitation light into first emission light (hv1) comprising a longer wavelength compared to the excitation light. The luminescent converter further comprising a second luminescent material (30) comprising organic luminescent material (30) and configured for absorbing at least a part of the first emission light emitted by the first luminescent material, and for converting at least a part of the absorbed first emission light into second emission light (hv2) having a longer wavelength compared to the first emission light.

Abstract: The invention provides an illumination device comprising an envelope enclosing a light source, preferably a LED, and a luminescent material. The envelope comprises a transmissive part, and a reflective part, wherein the reflective part comprises a reflective ceramic material. The ceramic material can be used for heat dissipation.

Abstract: The invention provides an illumination device comprising an envelope enclosing a light source, preferably a LED, and a luminescent material. The envelope comprises a transmissive part, and a reflective part, wherein the reflective part comprises a reflective ceramic material. The ceramic material can be used for heat dissipation.

Abstract: The invention provides an illumination device comprising an envelope enclosing a light source, preferably a LED, and a luminescent material. The envelope comprises a transmissive part, and a reflective part, wherein the reflective part comprises a reflective ceramic material. The ceramic material can be used for heat dissipation.

Abstract: The invention relates to a luminescent converter (10, 12) for a phosphor-enhanced light source (100, 102, 104). The luminescent converter comprises a first luminescent material (20) configured for absorbing at least a part of excitation light (hv0) emitted by a light emitter (40, 42) of the phosphor-enhanced light source, and for converting at least a part of the absorbed excitation light into first emission light (hv1) comprising a longer wavelength compared to the excitation light. The luminescent converter further comprising a second luminescent material (30) comprising organic luminescent material (30) and configured for absorbing at least a part of the first emission light emitted by the first luminescent material, and for converting at least a part of the absorbed first emission light into second emission light (hv2) having a longer wavelength compared to the first emission light.

Abstract: A low-pressure mercury vapor discharge lamp (1) has a discharge vessel (3) enclosing, in a gastight manner, a discharge space provided with a filling of mercury and a rare gas. The discharge vessel (3) comprises means for maintaining an electric discharge in the discharge space. A portion of the surface (15) of the discharge vessel (3) facing the discharge space is provided with a protective layer (16) comprising yttrium oxide or aluminum oxide and further comprises a borate and/or a phosphate of an alkaline earth metal and/or of scandium, yttrium, or a further rare earth metal. Preferably, the alkaline earth metal is calcium, strontium, and/or barium. Preferably, the further rare earth metal is lanthanum, cerium, and/or gadolinium. The lamp according to the invention has a comparatively low mercury consumption.

Abstract: A system 1 for controlling ambience of a designated environment comprises input means (3, 4-11) configured to receive at least one ambience input data, processing means (18) configured to process the at least one ambience input data in conjunction with a desired ambience profile for the designated environment, thereby generating at least one ambience output signal, and means (20) for providing said at least one ambience output signal to an ambience output unit, the unit being capable of generating a desired ambience corresponding to said ambience profile.

Abstract: An area light source (1) comprising a first light source (2) emitting light (L2) in a first wavelength range, and a light-transparent carrier screen (4) coated with a phosphorous layer (5) is disclosed. The area light source is characterised in that it comprises at least one additional light source (3) projecting light L3 in a second wavelength range, differing from said first wavelength range onto the carrier screen (4), said projected light L3 being capable of exciting the phosphorous layer (5).

Abstract: The artificial window (1) for use in apartments which lack a window through which day light may enter, has a light box (10) in which three sets of color lamps as light sources (13R,13G,13B) are mounted behind a diffuser (14). A window frame (20) is present in front of the diffuser (14) and a transparent plate (21) in the window frame (20), remote from the diffuser (14). Drivers (15) are present to start, to operate and to dim the light sources (13) thereby allowing to imitate natural light at different seasonal and time conditions. A number of features are described that further enhance the appearance of a real window.