Abstract: A laser-based light source includes a laser device configured to generate laser light of a predetermined laser wavelength and emit this laser light as a laser beam. A light-conversion device is configured to convert at least part of the laser light into converted light and a laser-output sensor is configured to determine a laser-output signal proportional to the output of laser light emitted by the laser device. Further, a converted-light sensor is configured to determine a converted-light signal proportional to the output of converted light emitted by the light-conversion device. A controller is configured to receive the laser-output signal and the converted-light signal, to determine a safe-to-operate parameter, based on the laser-output signal and the converted-light signal, and to control the operation of the laser-based light source based on a comparison of the safe-to-operate parameter with a at least one predefined threshold.

Abstract: The invention provides a method for providing a non-uniform pigment distribution in a first plant part (110) of a pigment generating plant (100), which accumulates pigment upon exposure by light, during indoor cultivation of said plant (100), wherein the first plant part (110) comprises a second plant part (120) and a third plant part (130), the method comprising subjecting in a first lighting stage at least the first plant part (110) to first light conditions that inhibit or prevent pigment accumulation in said first plant part (110), and subsequently subjecting in a second lighting stage the second plant part (120) of said first plant part (110) to second light conditions that promote pigment accumulation in said second plant part (120) while subjecting the third plant part (130) of said first plant part (110) to third light conditions that inhibit or prevent pigment accumulation in said third plant part (130).

Abstract: A luminaire comprising: a light source (10); an exit window (20) for light from the light source; and a diffuser (25; 200a; 200b; 200c; 200d) at the exit window for diffusing the light. The diffuser comprises a plurality of micro-optical elements (203a; 203b; 204, 205; 206, 207). Each micro-optical element is adapted to redirect light from the light source, so that the redirected light from each element emerges from the diffuser at a respective predetermined polar angle (?). The plurality of micro-optical elements comprise first micro-optical elements, which redirect light from the light source into a first range of polar angles, wherein the first optical elements occupy a greater proportion of the area of the diffuser in a first neighborhood than in a second neighborhood, and wherein the first neighborhood receives less light from the light source than the second neighborhood. Also provided is a method of designing and manufacturing a diffuser for such a luminaire.

Abstract: The invention provides a method for providing horticulture light (511) to a crop (1), the method comprising sideways illuminating the crop (1) with the horticulture light (511) of a lighting device (500), the lighting device (500) comprising a grid (530) comprising a plurality of light emitting diodes (LEDs) (510) and a plurality of through holes (570), wherein one or more of the plurality of LEDs (510) are configured to provide said horticulture light (511).

Abstract: The invention provides a method for enhancing the nutritional value in a first plant part (2) of a crop (1), wherein the first plant part (2) comprises an edible plant part, wherein the crop (1) in addition to the first plant part (2) comprises one or more other plant parts (3), wherein the method comprises illuminating during a nutritional enhancement lighting period a target part (5) of said first plant part (2) with horticulture light (511) that is selected to enhance formation of a nutrient in said first plant part (2) while allowing one or more other plant parts (3) to be subjected to different light conditions, wherein the nutritional enhancement lighting period is started within two weeks from harvest of the first plant part (2).

Abstract: An electronic device (101, 200, 300, 400) is provided comprising optically transmissive electrical components (102, 103, 205-210, 303, 304, 405-410, 413-418) and optically transmissive computer structures such as boards (105, 201-203) or enclosures (302, 311-313). The components of the electronic device communicate through optical signals (212, 214, 309, 314, 422, 428) that propagate freely within the electronic device. That is, the optical signals are not guided and may or may not travel through the optically transmissive structures and components. This enables increased communication paths and reduced number of physical connections between various parts of the electronic device. The components may be placed in a single plane or in a three-dimensional layout and still communicate via the light signals. The invention enables an adaptable layout of an electronic device which is easily constructed.

Abstract: An LED light bulb has a light emitting bulb part 22 which comprises a central core 24 running from the top towards the bottom and which provides an open passageway at least at the top. The LEDs are mounted in thermal contact around the central core 24. This design provides an air flow to promote cooling of the LEDs. This in turn enables a reduced size and cost of the heat sink, or avoids the need for a heat sink altogether.

Abstract: The present invention generally relates to systems and methods of illuminating plants, in particular, to providing supplemental lighting in addition to natural light to plants, and improving the crop yield when using such supplemental lighting. The invention is well suited for use in horticulture, for instance, in greenhouses.

Abstract: A beam shaping system is for example for use over an array of light sources. An array of beam shaping units is arranged in a general plane, each beam shaping unit comprising a central refracting area, an intermediate total internal reflection area for processing of light from a light source beneath the central area, and an outer total internal reflection area for processing light from the nearest light source and an adjacent light source. This outer area essentially extends the useful size of the adjacent beam shaping unit to improve the beam shaping performance and/or the optical efficiency.

Abstract: A floor covering system (10) with (a) a PVC-based floor covering (100) and (b) a lighting system (200) arranged to generate light (210). The PVC-based floor covering (100) has a user side (101) and an opposite back side (102). The lighting system (200) is arranged at the back side (102) of the PVC-based floor covering (100). The PVC-based floor covering (100) has a light transmission for light (210) generated by the lighting system (200) in the range of 0.5% to 30%, especially in the range of 1% to 20%.

Abstract: An optical element for use in front of a light source for obtaining a skylight appearance, and a luminaire are provided. The optical element comprising a plurality of light transmitting cells in a raster structure, a diffuser and an edge wall. A light source emits light towards the raster structure. The raster structure collimates a part of the light and transmits a further part of the light in a predetermined spectral range. White light and colored light that is transmitted by the raster structure may impinge upon the side wall of the optical element. One face of the side wall is a region of specular reflectivity and will reflect the light that impinges upon it back into the chamber that is formed by the cooperation of the raster structure, the diffuser and the edge wall. Light exits the optical element through the diffuser.

Abstract: A lighting device comprising at least four optical devices. Each optical device has an associated light source and comprises a first surface with a plurality of micro sized facets. Each facet has a respective orientation and said plurality of facets has an optical axis which extends parallel to the normal vector to an average orientation of all said respective orientations. The optical devices are divided over at least two sets of optical devices which are designed to mutually issue a different pattern during operation as the optical devices of different sets are arranged in a mutually alternating manner.

Abstract: An optical arrangement having at least a lens mode in which it is a lens arrangement comprising an array (9) of lenticular lenses (11) each of which has a particular lens surface shape such that, when tracing rays through a lenticular lens after they have entered one side of the lenticular lens, there exists at least one ray that hits the lenticular lens surface perpendicularly. This arrangement gives reduced banding and loss of intensity at steep angles when used in an autostereoscopic display.

Abstract: A display device (40) comprising: a display panel (41) comprising a set of pixels (41R, 41L) the pixels being spatially distributed over the display panel, and each pixel being for providing a light output, the set of pixels comprising a plurality of different subsets (411) of pixels, each subset of pixels comprising one or more pixels of the set of pixels, an imaging unit (42) arranged for imaging the one or more pixels of a subset of pixels to form pixel images on a plurality of view areas on an imaginary plane located at a first distance in front of the display, the plurality of view areas not overlapping each other, with at least one pixel image of each one of the different subsets of pixels overlapping on a same one of the plurality of view areas, the imaginary plane comprising an imaginary circle having the diameter of the pupil of an eye, and the imaginary circle enclosing at least a part of at least two of the plurality of view areas, where the at least two of the plurality of view areas at least part

Abstract: An autostereoscopic display device comprises a display arrangement such as an emissive display arrangement or an reflective display arrangement, with an array of spaced pixels. A light guiding arrangement has an array of light guide columns, with one column over each display pixel or over a group (such as a column) of pixels. The light guide columns comprise aside wall which tapers outwardly to define a funnel shape with the pixel at the smaller base of the funnel. The funnel provides collimation to reduce cross talk in the display, which is particularly problematic for 3D autostereoscopic displays.

Abstract: The invention provides an elongated lighting element (200) for attachment to a building part (10) selected from the group consisting of a wall (11), a ceiling (12) and a floor (13), wherein the building part (10) comprises a first attachment unit (131) and a first electrical power connector (141), wherein the elongated lighting element has a front side (210) and at the other side of the front side (210) (i) a second attachment unit (231) for forming with the first attachment unit (131) said attachment to said building part (10), (ii) a second electrical power connector (241) for forming an electrical connection with the first electrical power connector (141), and (iii) a plurality of solid state based light sources (250) configured to provide light source light (251) and functionally connected with the second electrical power connector (241).

Abstract: A switchable autostereoscopic display device includes a display panel having an array of display pixels for producing a display, and a lens arrangement for directing the output from different pixels to different spatial positions to enable a stereoscopic image to be viewed. The lens arrangement is in a plane parallel to the display panel and includes an electrically switchable LC layer which defines a lens pattern or a lens replica pattern. The LC alignment of the LC layer is electrically switchable such that the lens arrangement is switchable between 2D and 3D modes. In the 2D mode, the LC alignment is in a first direction substantially within the plane of the lens arrangement; and in the 3D mode, the LC alignment is in a second, perpendicular direction also substantially within the plane of the lens arrangement. The light output of the display panel is polarized in the second direction.

Abstract: An optical device comprising a first surface with a plurality of micro sized facets, each facet having a respective orientation. Said plurality of facets having an optical axis which extends parallel to the normal vector to an average orientation of all said respective orientations. The plurality of facets comprising at least a first and a second group of facets, each group is formed by a respective number of at least twenty-five compactly arranged neighboring facets. Each group is arranged to generate during operation a respective, mutually identical whole pattern. Each facet in a respective group is arranged to display a sub-pattern of said respective whole pattern. The whole patterns are mutually superpositioned.

Abstract: A horticultural lighting apparatus for illuminating a plant comprises a lighting module with multiple lighting elements. The lighting module is restricted to operating in a plurality of discrete modes which emit light with different discrete spectral compositions, by emitting light from the lighting elements in different predetermined combinations. These modes comprise a growth mode configured with a spectrum that promotes growth of the plant, and at least one steering mode configured with a spectrum that steers another biological process of the plant, wherein at least one of the lighting elements is arranged to emit in both the growth and steering modes. The apparatus further comprises a controller arranged to switch the lighting module between the plurality of discrete modes.

Abstract: The present application relates to a method of controlling an artificial light plant growing system (1). The method includes receiving information indicative of a production demand for a plant type to be grown in the artificial light plant growing system (1) and information indicative of an energy supply for a light source (9) of the artificial light plant growing system (1), and controlling operation of the light source (9) of a plant growing environment of the artificial light plant growing system (1) in dependence on the received information so that the production rate of a plant (8) of said plant type grown in the system (1) versus the production demand and energy supply is optimised. The present application also relates to a computer program comprising instructions which, when executed by at least one processor, cause the method of to be performed, a controller (5) for controlling an artificial light plant growing system (1), and an artificial light plant growing system (1).