Abstract:
The present invention relates to a flexible light source (100), adapted to be bent in at least one direction so as to form a line of curvature (Lc), comprising a translucent substrate (104), at least one light emitting diode (102) arranged to emit light into said substrate, and at least one light guide (103) arranged in the path of light between said at least one light emitting diode and said substrate. By placing the LEDs on the rear side of the translucent substrate, heat generated during operation of the LEDs may be transferred to the surrounding atmosphere, thus reducing the risk of overheating. In this way, the LEDs may be operated at temperatures which promote their efficient and long-lasting performance.
Abstract:
A luminaire arrangement for providing a luminous flux in a target direction (z) comprising a light guide (101), multiple light sources (103) arranged at said light guide for emitting light into said light guide, out coupling means (106) arranged at said light guide and adapted to direct light out from said light guide; and a cover layer (102) arranged in front of said light guide at the side where light it to be directed out, said cover layer being provided with at least one optically transparent area (104) such that light directed out from said light guide is allowed to pass said cover layer. The cover layer allows for use of the same or similar light guide, light sources and out coupling means in a number of different luminaire applications, where each application may have different requirements on e.g. appearance, and/or collimation and/or directivity of the luminous flux.
Abstract:
A light emitting diode (LED) lighting system for producing white light is disclosed. The system comprises sets of LEDs arranged to emit light with different wavelength ranges and associated with different sets of characteristics, and a driving circuit arranged to drive the LEDs. The driving circuit comprises an input for desired light intensity, color rendering index, and color temperature, an input for signals for LED temperature, a model for determining driving currents for said sets of LEDs from said parameters, signals, and characteristics for each of said sets of LEDs; and a current driver for the LEDs. At least one of the sets of LEDs comprises a first subset of LEDs with a first wavelength sub-range and a first set of characteristics, and a second subset of LEDs with a second wavelenght sub- range and a second set of characteristics. A lumped wavelength range of the set of LEDs is a range of said first and second wavelength sub-ranges, and the set of characteristics of the set of LEDs is a function of said first and second sets of characteristics. A method for controlling the sets of LEDs is also disclosed.
Abstract:
The application relates to setting color point and light intensity.Bycontrolling the phase aswell as the amplitudes of a driving voltage for a lighting device, the color point as well as the light intensity of a lighting device may be set.
Abstract:
The present invention relates to a LED lighting system (100) comprising at least a central controller (40) for just controlling a communication databus (50) in broadcast mode, and a distribution of LED controllers (30R, 30G, 30B) for individually controlling each LED (10R, 10G, 10B) through a respective driver (20R, 20G, 20B). The central controller (40) broadcasts targeted setting values from an external user (60) to all the distributed LED controllers (30R, 30G, 30B) through the databus (50). The LED controllers (30R, 30G, 30B) convert the values using a shared calibration matrix into transformed values for each LED color (R, G, B). In the case that some of these transformed values cannot be rendered by the LED lighting system (100), the targeted setting values can be properly adjusted either externally through a feedback signal sent over a link (70) back to the user (60), or internally through a notification signal broadcast over the databus (50) back to the central controller (40).
Abstract:
The present invention relates to alighting device (10) comprising a tiled light guide (16) comprising a central tile (12b) and at least one end tile (12a, 12c), the end tile(s) (12a, 12c) being arranged at an edge (24, 26) of the light guide (16); at least one solid state light source (18) arranged for coupling light into the light guide (16) in a general direction towards or awayfrom the end tile(s) (12a, 12c); and a plurality of out-coupling structures (20) arranged for coupling light out of the light guide (16); wherein the end tile(s) (12a, 12c) has inherent in-coupling and/or inherent out-coupling of light different from the central tile (12b).
Abstract:
The present invention relates to a light emitting diode (LED) luminary system (10) comprising a plurality of LED light sources (14) of multiple colors for producing a mixed color light, and means (28) for controlling the LED light sources in accordance with differences between set point values representing a mixed color light having a desired color and first control data representing the color of the mixed color light produced by the LED light sources, the first control data being provided by at least one color sensor (22). The system is characterized by means (30, 32) for deriving the temperature of each LED light source, and means (26) for compensating the set point values in accordance with second control data including the LED light source temperatures. This offers increased color stability for the system. The invention also relates to a method and system for controlling a LED luminary.
Abstract:
Controlling an arrangement of semiconductors of which different semiconductors emit light of different distinct colors is disclosed, whereby a feed forward control part, which is dependent on a junction temperature of semiconductors for each color, is operated with first intervals and is adjusted dependent on measure light output for each color with much longer second intervals.
Abstract:
The present inventions relates to a method for adjusting the light setting for a multi-color light source, which method comprises receiving input from a user related to at least one of white color, hue, and chroma, and adjusting white color, hue, and chroma of the light source in accordance with the user input. The method is characterized in the step of automatically changing a current hue and chroma level when the user input is received. This automatic change makes possible to render the subsequent adjustment in setting perceivable for the user, which facilitates the adjustment of the light source. The present invention also relates to a corresponding system and computer program product.
Abstract:
The present inventions relates to a method for adjusting the light setting for a multi-color light source, which method comprises receiving input from a user related to at least one of white color, hue, and chroma, and adjusting white color, hue, and chroma of the light source in accordance with the user input. The method is characterized in the step of automatically changing a current hue and chroma level when the user input is received. This automatic change makes possible to render the subsequent adjustment in setting perceivable for the user, which facilitates the adjustment of the light source. The present invention also relates to a corresponding system and computer program product.