Abstract: A lighting system and method for the growing of a plant seedling is disclosed, including at least one light source (30) for illuminating the plant seedling (39) with grow light during growth stages of the plant seedling growth process, and a controller for the controlling the spectral power distribution of the grow light emitted from the light source (30) such that the grow light in at least some growth stages of the plant seedling growth process comprises more energy in the blue wavelength range than in other growth stages of the plant seedling growth process. In use cases where the grow light is supplementing available daylight, an additional sensor (33) may be used to measure the amount and spectral composition of daylight and control the grow light such that spectral power distribution of total light received by the plant seedling is controlled accordingly.

Abstract: The invention provides an interface (20) for converting a desired physiological plant response into control instructions for at least one lighting system (4,5) which has an adjustable lighting property, said interface (20) comprising: a receiver for receiving a desired physiological plant response; a processor functionally coupled to said receiver for converting said desired physiological plant response into said control instructions, and a transmitter (7), functionally coupled to said processor for transmitting said control instructions to said at least one lighting system (4,5) wherein said desired physiological plant response is defined as a set point in a multi-dimensional horticulture action space.

Abstract: The invention relates to a current determination apparatus for determining an operational driving current for driving a light source of a group of light sources. A same color shift function defining a light color shift depending on a driving current can be provided for all light sources of the group. An operational driving current is determined based on the color shift function such that the light color (43) of the light source of the group of light sources is shifted from a nominal color, which may be specific for each light source, to a light color (45) within a target color window (41). Since for the different light sources the same color shift function can be used, a determination of individual operational driving currents such that the light sources of the group emit light having substantially the same color can be simplified.

Abstract: The present invention relates to a method for adjusting a color point (507, 509, 511) of light emitted (111) from an organic light emitting diode OLED (107) by using current (115) with a modulated waveform for driving the OLED (107), wherein the waveform is characterized by at least three different parameters, and wherein the color point (507, 509, 511) is located in a color space, the method comprising: —defining a color point target (501); —adjusting simultaneously the at least three parameters to tune the waveform such that the resulting light output of the OLED (107) is lying within a predefined area around the color point target and for which the brightness of the OLED (107) remains at a predefined level; and —employing the tuned waveform to provide the current (115) with the modulated waveform to the OLED (107).

Abstract: The invention provides a lighting system comprising (i) a lighting device comprising a plurality of light sources for application in a horticulture production facility, wherein the light sources are configured to illuminate with horticulture light crops, wherein the lighting system further comprises (ii) a control unit configured to control the light intensity of local light at a location, wherein the local light is the sum of the horticulture light and light at the location originating from an optional other light source, and wherein the control unit is configured to prevent a change in the photosynthetic photon flux density (PPFD) of the local light at the location of on average more than 50 ?mol/sec/m2 over a predetermined period of time selected from the range of equal to or smaller than 5 minutes by controlling the contribution of the horticulture light to the local light.

Abstract: The invention provides a lighting device (100) with light emitting diodes (10) configured to generate light (11) having a wavelength selected from the range of 400-475 nm, wherein the lighting device (100) comprises at least two light emitting parts (100a, 100b). The first light emitting part (100a) comprises a first subset (10a) of light emitting diodes (10), and is configured to provide a first light (111a) having the first spectral light distribution substantially in the range of 400-475 nm. The second light emitting part (100b) comprises a second subset (10b) of light emitting diodes (10) and comprising a light conversion element (20) configured to convert at least part of the light (11) generated from the second subset (10b) of the plurality of light emitting diodes (10) into the second light (111b), with the second spectral light distribution substantially in the range of 625-800 nm.

Abstract: The present invention relates to a method for adjusting a color point (507, 509, 511) of light emitted (111) from an organic light emitting diode OLED (107) by using current (115) with a modulated waveform for driving the OLED (107), wherein the waveform is characterized by at least three different parameters, and wherein the color point (507, 509, 511) is located in a color space, the method comprising: - defining a color point target (501);-adjusting simultaneously the at least three parameters to tune the waveform such that the resulting light output of the OLED (107) is lying within a predefined area around the color point target and for which the brightness of the OLED (107) remains at a predefined level; and-employing the tuned waveform to provide the current (115) with the modulated waveform to the OLED (107).

Abstract: The invention relates to a window (1), in particular, a building window, wherein the window comprises photoluminescent material (2) located within the window. The photoluminescent material (2) is preferentially a phosphorescent material provided on a sun blind which is located within a sealed space (5) between two transparent plates (3, 4) of the window. The photoluminescent material can be charged up by daylight and during the night the photoluminescent material can emanate light. Since the photoluminescent material is located within the window, the photoluminescent material is protected against environmental influences, in particular, against humidity, thereby increasing the lifetime of the photoluminescent material and, thus, of the window. The invention relates further to an object, in particular, a building, comprising the window, thereby giving the object an ambient glow.

Abstract: The invention relates to a current determination apparatus for determining an operational driving current for driving a light source of a group of light sources. A same color shift function defining a light color shift depending on a driving current can be provided for all light sources of the group. An operational driving current is determined based on the color shift function such that the light color (43) of the light source of the group of light sources is shifted from a nominal color, which may be specific for each light source, to a light color (45) within a target color window (41). Since for the different light sources the same color shift function can be used, a determination of individual operational driving currents such that the light sources of the group emit light having substantially the same color can be simplified.

Abstract: The invention relates to an electroluminescent device for emitting light having an adjustable color point. An electroluminescent region (1) emits light in response to a lighting current and a heating element (7) applies heat to the electroluminescent region A heating control unit (9) controls the heating element (7) in applying the heat in order to adjust the color point of the emitted light. The color point of the light emitted by the electroluminescent device is dependent on the temperature of the electroluminescent region (1). Since the electroluminescent device comprises a heating element (7) for applying heat to the electroluminescent region (1) and a heating control unit (9) for controlling the heating element (7) in applying the heat, the color point can be adjusted in a simple way by using the heating control unit (9).

Abstract: The invention relates to a window (1), in particular, a building window, wherein the window comprises photoluminescent material (2) located within the window. The photoluminescent material (2) is preferentially a phosphorescent material provided on a sun blind which is located within a sealed space (5) between two transparent plates (3, 4) of the window. The photoluminescent material can be charged up by daylight and during the night the photoluminescent material can emanate light. Since the photoluminescent material is located within the window, the photoluminescent material is protected against environmental influences, in particular, against humidity, thereby increasing the lifetime of the photoluminescent material and, thus, of the window. The invention relates further to an object, in particular, a building, comprising the window, thereby giving the object an ambient glow.

Abstract: The present invention relates to a light emitting device, comprising: a LED die (10) having a first surface (12), a second surface (14) and at least one side facet (16) connecting the first and the second surface (12, 14). Further, the LED die comprises a light polarizing layer (20), a light blocking layer (30), and a light reflecting layer (40). The light polarizing layer (20) is arranged on the first surface (12), the light blocking layer (30) is arranged on the at least one side facet (16), and the light reflecting layer (40) is arranged on the second surface (14) of the LED die.

Abstract: A device (1) is provided with a configuration of two walls (3a; 5a) confining a substantially closed gap-like space (7) containing a gaseous medium. For cooling purposes the device is further provided with a synthetic jet generator (9) for generating a gaseous synthetic jet, wherein the generator is fluidically coupled to the gas-like space.

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, comprising: a LED die (10) having a first surface (12), a second surface (14) and at least one side facet (16) connecting the first and the second surface (12, 14). Further, the LED die comprises a light polarizing layer (20), a light blocking layer (30), and a light reflecting layer (40). The light polarizing layer (20) is arranged on the first surface (12), the light blocking layer (30) is arranged on the at least one side facet (16), and the light reflecting layer (40) is arranged on the second surface (14) of the LED die.

Abstract: A cooling assembly for cooling a heat source, such an electronic components, with a coolant includes micro jets adapted to eject the coolant onto the heat source in response to a control signal, and a controller adapted to control the ejection of the coolant from the micro jets in a sweep mode in which the micro jets eject the coolant sequentially. The micro jets may be arranged as an array and the coolant is forced induce velocity perturbations of the coolant, to avoid the occurrence of free circulation areas in the cooling channel, and to obtain a microscopic transport of the cooling through the cooling channel.

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.