Abstract: The invention provides a lighting system (100) comprising a first lighting element (10) and a control unit (50), wherein: a) the first lighting element (10) is configured to provide first lighting element light (11) with controllable lighting intensity, wherein the first lighting intensity can be selected from a plurality of values in the range of 0-I, with I being a predetermined first lighting element maximum intensity; b) the control unit (50) is configured to maintain a first lighting element intensity, during a first predetermined period at an intensity value larger than zero when a general lighting intensity is below a predetermined first threshold level; c) the control unit (50) is further configured to maintain the first lighting element intensity during a second predetermined period at an intensity value a*y*I when the general lighting intensity level is y*I, y being the factor the general lighting intensity is below I, with 0<y<1, the parameter a being a predetermined lighting setting with 0&l

Abstract: A lighting device comprising a housing with a light emission window and, opposite thereto, a reflector. A planar light transmissive carrier arranged in between the light emission window and the reflector and comprising, at least on a side facing towards the reflector, a grid of a plurality of light sources. The plurality of light sources comprise a first group of first light sources and a second group of second light sources. Each first light source has a respective first emission orientation in a respective first direction away from the reflector and each second light source has a respective second emission orientation to issue light towards the reflector, which light, after reflection, is redirected into a respective first direction. The lighting device is able to provide accent lighting and/or diffuse lighting issued by light sources arranged on one planar carrier.

Abstract: A lighting device (1) comprising a housing (3) with a light emission window (5) and, opposite thereto, a reflector (7). A planar light transmissive carrier (9) arranged in between the light emission window and the reflector and comprising, at least on a side (11) facing towards the reflector, a grid (13) of a plurality of light sources (15,17). The plurality of light sources comprise a first group (19) of first light sources (15) and a second group (21) of second light sources (19). Each first light source has a respective first emission orientation (23) in a respective first direction (25) away from the reflector and each second light source has a respective second emission orientation (31) to issue light towards the reflector, which light, after reflection, is redirected into a respective first direction (25a). The lighting device is able to provide accent lighting and/or diffuse lighting issued by light sources arranged on one planar carrier.

Abstract: Disclosed is a lighting fixture including a tubular housing and a cylindrical member that extends within the tubular housing parallel to a longitudinal axis of the tubular housing. A lighting assembly including a strip of light sources may be movably mounted on the surface of the cylindrical member so that the strip of light sources extends parallel to the longitudinal axis. In various embodiments, the lighting assembly is movable about an arc of the surface of the cylindrical member. In various embodiments, the light sources may be LED-based or another type of light source. In some embodiments, one or more lighting fixtures described herein may be used as replacement bulbs in conventional fluorescent light fixtures.

Abstract: According to an aspect of the present inventive concept, this and other objects are achieved by a lighting system (100) for illuminating an article (112) comprising: a lighting device (102) arranged to emit light (103) towards the article (112), wherein a spectrum of the emitted light (103) is controllable. The lighting system (100) further comprises a controller (104) configured to control the lighting device (102) responsive to detection of presence or movement of an object (110) within a detection zone (108) associated with the article (112). The controller (104) is configured to: control the lighting device (102) to emit light (103) having a first spectrum in response to absence of an object (110) or movement of an object (110) within the detection zone (108), and control the lighting device (102) to emit light having a second spectrum in response to presence of an object (110) or movement of an object (110) within the detection zone (108).

Abstract: A lighting arrangement (100, 300, 400, 600) configured to illuminate an object (108, 308, 408, 608), the lighting arrangement (100, 300, 400, 600) configured to emit light of a plurality of colors, and a control unit for controlling mixed light emitted by the lighting arrangement is disclosed. The control unit is configured to determine the object (108, 308, 408, 608) to be illuminated and to receive a reflection spectrum of the object. Then, the control unit selects control parameters for mixed light emitted by the lighting arrangement, the mixed light having an illumination spectrum matching the reflection spectrum of the object based on predetermined parameters relating to the type of object. Furthermore, the lighting arrangement illuminates the object based on the selected control parameters provided by the control unit. A corresponding method and a computer program product are also disclosed.

Abstract: A lighting system 100 and a method of controlling a lighting system are provided. The lighting system comprises a lighting arrangement 106 with a first light emitter 108, a second light emitter 114 and a driving circuitry 104 and comprises a controller 102 providing a control signal 103 to the driving circuitry. The first and second light emitters emit different colors or light L1, L2. The controller is configured to generate the control signal such that a required minimum amount of light is received at a relative position P with respect to the lighting arrangement and that the amount of power used by the lighting arrangement is minimized when the lighting arrangement emits light in accordance with the generated control signal. In the generation of the control signal efficiency ratios R1, R2 for the different light emitters are taken in to account.

Abstract: An illumination system and method is disclosed. In one example, the illumination system comprises a lamp assembly for generating color-variable light, a controller for generating control signals for the lamp assembly, source color input means, preferably a color sensor, for inputting to the controller information defining a source color; a memory associated with the controller, containing information defining at least one color harmony rule. On the basis of the input source color, and using the harmony rule from the memory, the controller calculates a target color and generates its output control signals accordingly. Thus, the light output from the lamp assembly harmoniously matches the measured color of surroundings or objects.

Abstract: Methods and apparatus that provide first lighting having first light output characteristics to a first user and simultaneously provide second lighting having second light output characteristics to a second user. The first lighting and the second lighting are distinct and may optionally be dynamic and responsive to lighting needs of the respective users.

Abstract: A lighting system 100 and a method of controlling a lighting system are provided. The lighting system comprises a lighting arrangement 106 with a first light emitter 108, a second light emitter 114 and a driving circuitry 104 and comprises a controller 102 providing a control signal 103 to the driving circuitry. The first and second light emitters emit different colors or light L1, L2. The controller is configured to generate the control signal such that a required minimum amount of light is received at a relative position P with respect to the lighting arrangement and that the amount of power used by the lighting arrangement is minimized when the lighting arrangement emits light in accordance with the generated control signal. In the generation of the control signal efficiency ratios R1, R2 for the different light emitters are taken in to account.

Abstract: Methods for providing personalized lighting to users (102A, 102H) positioned proximal to one another. First lighting (103A, 106A) may be provided to a first user (102A) when the first user is not proximal any conflicting lighting users (102H). Second lighting (103A, 106A) may be provided to the first user (102A) when a first user lighting need is in conflict with a conflicting user (103H, 106H) lighting need of a conflicting user (102H) that is proximal the first user (102A). The second lighting (103A, 106A) may be set to minimize contrast with lighting supplied to the conflicting user.

Abstract: A lighting system comprises a light source having an exit window and an electrically controllable light processing arrangement, in the form of a grid of cells lying in a plane parallel to the exit window. Each cell has a cell wall formed as electrically switchable element which is switchable between at least two processing modes. The cell wall surrounds an opening, such that light emitted in a normal direction from the light source exit window is not processed, and light passing at an angle to the normal direction greater than a threshold angle is processed by the cell wall for color and/or intensity control.

Abstract: The invention provides a lighting system (100) comprising a first lighting element (10) and a control unit (50), wherein: a) the first lighting element (10) is configured to provide first lighting element light (11) with controllable lighting intensity, wherein the first lighting intensity can be selected from a plurality of values in the range of 0-I, with I being a predetermined first lighting element maximum intensity; b) the control unit (50) is configured to maintain a first lighting element intensity, during a first predetermined period at an intensity value larger than zero when a general lighting intensity is below a predetermined first threshold level; c) the control unit (50) is further configured to maintain the first lighting element intensity during a second predetermined period at an intensity value a*y*I when the general lighting intensity level is y*I, y being the factor the general lighting intensity is below I, with 0<y<1, the parameter a being a predetermined lighting setting with 0&l

Abstract: Disclosed are methods and apparatus that enable selectively applied face lighting and, optionally, selectively applied task lighting, for example, in daylight-responsive lighting systems and/or therapeutic lighting systems. The face lighting may be selectively provided in a plurality of modes to one or more user segments, and, optionally, only provided to those user segments having a human presence.

Abstract: According to an aspect, a light guiding assembly (1) with a tubular member (2) for guiding light is provided. The light guiding assembly comprises a first layer (51, 61) having a first optical characteristic, the first layer being arranged on an inner wall (5) of the tubular member, and a second layer (52, 62) having a second optical characteristic, the second layer being adjustable at least with respect to the second optical characteristic and with respect to the extent of light allowed to be transmitted through the second layer. The second layer is coupled to a side of the first layer facing away from the inner wall. One of the first and second optical characteristics effects changing of the color of light guided in the tubular member, and the other one of the first and second optical characteristics effects reflection of light guided in the tubular member. Accordingly, the color of daylight guided through the tubular member can be tuned.

Abstract: According to an aspect, a lighting device (10) for a light guiding assembly (1) is provided. The lighting device is adapted to be arranged at an output end (4) of a tubular member (2) of the light guiding assembly. The lighting device comprises a light source (13), and a layer (11) adjustable at least with respect to reflection of light impinging thereon and with respect to the extent of light allowed to be transmitted through the layer. The layer is arranged to reflect light outputted from the output end of the tubular member when the layer has been adjusted so as to be at least partially reflective, and transmit light emitted by the light source through the layer when the layer has been adjusted so as to be at least partially light transmitting. The light redirected by the layer may be part of the illumination output by the light guiding assembly.

Abstract: According to an aspect, a control unit (130) adapted to be communicatively coupled to a window (110) is provided. The window is adapted to controllably effect changing of color temperature of light transmitted through the window. The control unit is configured to obtain a signal indicative of the color temperature of light which is to be, and/or has been, transmitted through the window, and control the window at least with respect to color temperature of light transmitted through the window based at least on the signal indicative of color temperature. With the present control unit, it may be possible to maintain a certain color temperature even if the color temperature of the light to be transmitted through the window changes.

Abstract: A lighting arrangement for presentation of a first object is disclosed. The arrangement comprises an accent lighting assembly and a decoration lighting assembly. The accent lighting assembly is arranged to provide illumination of the first object, has at least one accent light characteristic, and comprises at least one accent light generating device. The decoration lighting assembly is arranged to provide background lighting of the first object, has at least one decoration light characteristic, and comprises at least one decoration light generating device. The arrangement also comprises at least one sensor, arranged to detect a distance between the sensor and a second object and to generate a signal value representing the distance, and a controller arranged to receive the signal value from the at least one sensor and to adapt the accent light characteristic and the decoration light characteristic based on the signal value. Corresponding use, method and computer program product are also disclosed.

Abstract: A lighting device (1) comprising a housing (3) with a light emission window (5) and, opposite thereto, a reflector (7). A planar light transmissive carrier (9) arranged in between the light emission window and the reflector and comprising, at least on a side (11) facing towards the reflector, a grid (13) of a plurality of light sources (15,17). The plurality of light sources comprise a first group (19) of first light sources (15) and a second group (21) of second light sources (19). Each first light source has a respective first emission orientation (23) in a respective first direction (25) away from the reflector and each second light source has a respective second emission orientation (31) to issue light towards the reflector, which light, after reflection, is redirected into a respective first direction (25a). The lighting device is able to provide accent lighting and/or diffuse lighting issued by light sources arranged on one planar carrier.

Abstract: Methods for providing personalized lighting to users (102A, 102H) positioned proximal to one another. First lighting (103A, 106A) may be provided to a first user (102A) when the first user is not proximal any conflicting lighting users (102H). Second lighting (103A, 106A) may be provided to the first user (102A) when a first user lighting need is in conflict with a conflicting user (103H, 106H) lighting need of a conflicting user (102H) that is proximal the first user (102A). The second lighting (103A, 106A) may be set to minimize contrast with lighting supplied to the conflicting user.