WO2023135003A1 - Lighting system comprising a control unit and method for controlling a lighting system - Google Patents

Lighting system comprising a control unit and method for controlling a lighting system Download PDF

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Publication number
WO2023135003A1
WO2023135003A1 PCT/EP2022/087701 EP2022087701W WO2023135003A1 WO 2023135003 A1 WO2023135003 A1 WO 2023135003A1 EP 2022087701 W EP2022087701 W EP 2022087701W WO 2023135003 A1 WO2023135003 A1 WO 2023135003A1
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WO
WIPO (PCT)
Prior art keywords
light
light output
power consumption
lighting system
light sources
Prior art date
Application number
PCT/EP2022/087701
Other languages
French (fr)
Inventor
Eliel GARCIA
Marcus Cornelis VAN MEEL
Martinus Hermanus Wilhelmus Maria Van Delden
Original Assignee
Signify Holding B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Signify Holding B.V. filed Critical Signify Holding B.V.
Publication of WO2023135003A1 publication Critical patent/WO2023135003A1/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/14—Controlling the light source in response to determined parameters by determining electrical parameters of the light source

Definitions

  • Lighting system comprising a control unit and method for controlling a lighting system
  • the present invention generally relates to lighting system. More specifically, the present invention is related to a lighting system for controlling a plurality of light sources.
  • Lighting systems involving a plurality of light sources are often controlled using control devices, in order to create a desired lighting.
  • control devices may include one or more light controls, such as normal switches, and/or digital solutions where multiple lamps can be controlled from a single display.
  • Lighting systems of this kind are growing in complexity and in its variety, and it will be appreciated that the systems may use many different light sources of different colours and intensity to create an overall desired light scene.
  • property(ies) of light e.g. the colour and intensity of light
  • US 20100296285 Al discloses a method and system provided for designing improved intelligent, LED based lighting systems.
  • the LED based lighting systems may include fixtures with one or more of rotatable LED light bars, integrated sensors, onboard intelligence to receive signals from the LED light bars and control the LED light bars, and a mesh network connectivity to other fixtures.
  • the method may further include storing a plurality of energy demand parameters wherein each of the plurality of energy demand parameters may be associated with a lighting regulation parameter such that when energy demand information is provided, at least one lighting system may be controlled in accordance with the lighting regulation parameter.
  • This energy demand parameter may relate to utility energy demand and/or alternate energy demand.
  • a lighting system comprising a plurality of light sources arranged to provide a light output arranged to fulfil at least one predetermined criterion.
  • the plurality of light sources comprises at least one first light source arranged to provide a first light output, and at least one second light source arranged to provide a second light output, wherein at least one property of the first light output is different from at least one property of the second light output.
  • the lighting system further comprises a control unit connected to the plurality of light sources.
  • the control unit is configured to obtain a power consumption of the plurality of light sources, and control, in case the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources.
  • a lighting arrangement comprising a lighting system according to the first aspect of the present invention, a first luminaire comprising the at least one first light source, and a second luminaire comprising the at least one second light source.
  • a method for controlling a lighting system comprising a plurality of light sources comprising at least one first light source arranged to provide a first light output and at least one second light source arranged to provide a second light output, wherein at least one property of the first light output is different from at least one property of the second light output.
  • the method comprises providing, by the plurality of light sources, a light output arranged to fulfil at least one predetermined criterion.
  • the method further comprises obtaining a power consumption of the plurality of light sources.
  • the method further comprises determining if the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, and in case the power consumption of the plurality of light sources reaches the predetermined threshold of the power consumption, controlling at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources.
  • the first, second and third aspect of the present invention are based on the common concept or idea of providing a lighting system or method for controlling a lighting system wherein a plurality of light sources are controlled in order to keep the power consumption of the plurality of light sources below a predetermined threshold, while still providing a light output fulfilling one or more predetermined criterions.
  • the first, second and third aspect of the present invention share a common general inventive concept of providing a light output fulfilling (a) certain criterion(s) while keeping the power consumption of the plurality of light sources below a threshold, by controlling property(ies) of the first light source(s) and property(ies), different from the property(ies) for the first light source(s), of the at least one second light source. This allows the lighting system to provide a light output fulfilling (a) predetermined criterion(s) by changing one or more properties of individual light sources, or sets of light sources, in the lighting system.
  • the lighting system can keep the power consumption below the predetermined threshold even if the at least one predetermined criterion would imply that the power consumption of the plurality of light sources needs to go above the predetermined threshold of the power consumption in order to provide a desired light output.
  • the predetermined criterion may be fulfilled, while the power consumption of the plurality of light sources are kept at, or below, the predetermined threshold of the power consumption.
  • the lighting system can be more energy efficient.
  • the system may be more energy efficient because the plurality of light sources may be individually controlled in order to provide a light output for the plurality of light sources with the predetermined condition(s) fulfilled while keeping the power consumption below the predetermined threshold.
  • a lighting system is provided which allows energy to be used in an efficient manner when providing a light output with the predetermined criterion(s) fulfilled while not surpassing the predetermined threshold of the power consumption.
  • the lighting system provides a desired overall light output, fulfilling at least one predetermined criterion, e.g. for a room, by automatically controlling properties of individual light outputs, while still complying with the power consumption threshold.
  • the lighting system comprises a plurality of light sources arranged to provide a light output arranged to fulfil at least one predetermined criterion.
  • predetermined criterion it is here meant any criterion associated with the light output.
  • the one or more predetermined criterions may be, or be related to, physical properties of the light output.
  • the predetermined criterion(s) may be, or be related to, intangible properties such as perceived brightness/intensity which are related to both physical properties of the light and human physiology.
  • the predetermined criterion may furthermore be a desired characteristic of the light output.
  • the plurality of light sources in its turn, comprises at least one first light source arranged to provide a first light output, and at least one second light source arranged to provide a second light output. At least one property of the first light output is different from at least one property of the second light output.
  • light output it is here meant the total light being emitted by the first and second light sources.
  • property it is here meant any physical property of the light being emitted, such as intensity or color/wavelength.
  • the plurality of light sources may all be part of one luminaire, or they may be arranged in different luminaires.
  • the at least one first light source may be part of one first luminaire having a certain light output
  • the at least one second light source may be part of a different luminaire having a different light output than the at least one first light output, in terms of lighting characteristics.
  • the plurality of light sources may be substantially any type of light source which allows at least one property to be changed.
  • a light source may be a light-emitting diode, LED, light source.
  • the lighting system further comprises a control unit connected to the plurality of light sources.
  • control unit it is here meant substantially any unit, device, arrangement, or the like, which is configured and/or arranged to control the plurality of light sources.
  • connected it is here meant, but not limited to, coupled, or linked together, such that e.g. a real or notional link is established.
  • the control unit is configured to obtain a power consumption of the plurality of light sources.
  • the control unit is configured to obtain, it is here meant any action which allows the control unit to receive information regarding the power consumption of the plurality of light sources.
  • the control unit is further configured to control, in case the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, at least one property of the first light output and the second light output, in order to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption, while still providing the light output.
  • predetermined threshold it is here meant a limit, such as a maximum limit, of the power consumption.
  • the control unit is configured to control the property(ies) of the first and/or the second light outputs for keeping the power consumption below the threshold/limit whilst providing the light output fulfilling the predetermined criterion(s).
  • the control unit is configured to control the at least one property of at least one of the first light output and the second light output by a distribution of power between the at least one first light source and the at least one second light source.
  • distributed of power it is here meant how the power is allocated, to e.g. different light sources.
  • the property(ies) of the first light output may be changed by reducing the power used by the first light source(s) and distribute the power being taken from the first light source(s) to the second light source(s).
  • the present embodiment is advantageous in that the property of the at least one light source and the at least one second light source may be changed only by adjusting the distribution of power.
  • the light output of separate light sources may be adjusted by the control unit by a distribution of the power differently while still keeping the power consumption below the predetermined threshold and providing a light output fulfilling at least one predetermined criterion.
  • the at least one property of at least one of the first light output and the second light output comprises at least one of wavelength and intensity.
  • the control unit may be configured to maintain the power consumption of the plurality of light sources below the predetermined threshold by adjusting the wavelength and/or intensity of the fist and/or second light output.
  • the wavelength and/or intensity may be adjusted by the control unit for separate light sources in order to keep the power consumption below the predetermined threshold while still providing a light output fulfilling a predetermined criterion.
  • the lighting system further comprises a light control connected to the control unit, wherein the light control is configured to be operated by a user.
  • light control it here meant substantially any device, unit, or the like for light control, such as a knob, a user interface, a switch, etc.
  • the present embodiment is advantageous in that it allows a user to provide input to the lighting system.
  • the light control is configured to set the at least one predetermined criterion of the light output upon operation of the light control by the user.
  • the present embodiment is advantageous in that it provides a lighting system which allows a user to control the at least one predetermined criterion, and automatically keeps the power consumption below the predetermined threshold.
  • the at least one predetermined criterion of the light output is configured to change with time.
  • the present embodiment is advantageous in that the light output can automatically be adjusted based on the time of day, e.g. such that it automatically correlates with a human’s circadian rhythm.
  • the at least one predetermined criterion comprises a criterion associated with the brightness of the light output.
  • the present embodiment is advantageous in that the light output fulfilling the predetermined criterion may provide a brightness which may be controlled by changing a property of at least one of the first light output and the second light output without increasing the power consumption.
  • brightness it is here meant the perceived brightness, which is associated not only with the physical properties of the light, but also by biological factors in the human body which determines how bright something is perceived.
  • the control unit is configured to control at least one of the first light output and the second light output while keeping the power consumption of the plurality of light sources constant.
  • the present embodiment is advantageous in that the lighting system can keep the power consumption constant while providing a light output fulfilling a predetermined criterion, by controlling at least one property of at least one of the first light source and the at least one second light source.
  • the present embodiment is advantageous in that it allows the lighting system to change the light output of the plurality of light sources without increasing the power consumption.
  • the first light output comprises blue light in a wavelength range of 380-500 nm
  • the second light output comprises light of a different colour than the first light output.
  • the present embodiment is advantageous in that blue light may provide a higher perceived brightness than other colours. Consequently, the blue light may affect the human body by activating it, e.g. by influencing the body’s circadian rhythm. For example, the blue light may reduce secretion of the sleep hormone melatonin, and thus influence the circadian rhythm. This interaction between the human body and different wavelengths of the light output allows the light output to have a higher perceived brightness without increasing the power consumption of the plurality of lights.
  • the power consumption of the plurality of light sources is predetermined.
  • the power consumption of the plurality of light sources may be determined in advance by e.g. performing practical experiments or theoretical calculations, manually by a person or automatically by e.g. a computer.
  • the present embodiment is advantageous in that the power consumption of the plurality of light sources is known, resulting in a faster, more efficient, and more precise control of the power consumption.
  • the control unit is connected to the first luminaire and the second luminaire, and wherein the control unit is configured to individually control the first luminaire and the second luminaire.
  • the present embodiment is advantageous in that the lighting system may control at least two different luminaires separately, allowing improved control of the first and second light outputs and the power consumption.
  • the controlling of the at least one property of at least one of the first light output and the second light output is performed by a distribution of power between the at least one first light source and the at least one second light source.
  • the controlling of the at least one property of at least one of the first light output and the second light output is performed while keeping the power consumption of the plurality of light sources constant.
  • Fig. la schematically shows a lighting system according to an exemplifying embodiment of the present invention.
  • Fig. lb shows a graph illustrating the relation between the power consumption and a predetermined criterion according to exemplifying embodiments of the present invention.
  • Fig. 2 schematically shows a lighting system according to an exemplifying embodiment of the present invention.
  • Fig. 3 schematically shows a lighting system according to an exemplifying embodiment of the present invention.
  • Fig. 4 schematically shows a method for controlling a lighting system according to exemplifying embodiments of the present invention.
  • Fig. la schematically shows a lighting system 100 according to an exemplifying embodiment of the present invention.
  • the lighting system 100 comprises a plurality of light sources 110.
  • the plurality of light sources 110 is exemplified as comprising (only) two light sources, a first light source 112 and a second light source 114, but it should be noted that the plurality of light sources 110 of the lighting system 100 may comprise substantially any number of light sources.
  • the at least one first light source 112 is arranged to provide a first light output.
  • the at least one second light source 114 is configured to provide a second light output having at least one property being different from the first light output.
  • the at least one first light source 112 may emit light with a first set of physical properties
  • the at least one second light source 114 may emit light of a second set of physical properties, wherein at least one property is different between the first set and the second set.
  • the at least one first light source 112 and the at least one second light source 114 may be arranged in the same luminaire.
  • the plurality of light sources 110 is arranged to provide a light output arranged to fulfil at least one predetermined criterion.
  • the predetermined criterion may be a brightness, which may be the brightness as perceived by a human.
  • the predetermined criterion may be a desired property of the emitted light from the plurality of light sources 110 determined by e.g.
  • the lighting system 100 may allow the predetermined criterion to change, e.g. a change of the brightness, by changing one or more property(ies) of the at least one first light source 112 and/or the at least one second light source 114, without having to increase the power consumption.
  • the combined light output of the first light output and the second light output may fulfil the predetermined criterion, such as perceived brightness, without changing the power consumption of the plurality of light sources 110.
  • the brightness may not only depend on the sum of the intensity of the different light outputs, i.e. the sum of the number of emitted photons per unit of time, but also on biological factors of the human body. This is because the human body perceives brightness not only based on intensity but also on e.g. colour.
  • the lighting system 100 further comprises a control unit 120.
  • the control unit 120 is connected to the plurality of light sources 110.
  • the control unit 120 may be connected to the plurality of light sources 110 via wiring and/or wirelessly.
  • the control unit 120 is configured to obtain a power consumption of the plurality of light sources 110.
  • the control unit 120 is further configured to control, in case the obtained power consumption of the plurality of light sources 110 reaches a predetermined threshold of the power consumption, at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources 110 below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources 110.
  • the control unit 120 may be configured to control the at least one property of at least one of the first light output and the second light output by a distribution of power between the at least one first light source and the at least one second light source. For example, the control unit 120 may reduce the power being distributed to the at least one first light source 112, and increase the power being distributed to the at least one second light source 114. This may be performed while the lighting system 100 provides the light output fulfilling the at least one predetermined criterion and keeping the power consumption below the predetermined threshold value.
  • the overall light output from the plurality of light sources 110 may fulfil the at least one predetermined criterion, while at least one property of at least one of the at least one first light source 112 and the at least one second light source 114 is changed by the control unit 120, by changing the distribution of power between the light sources.
  • the predetermined threshold of the power consumption may be determined by lighting standard and/or building rules, i.e. the predetermined threshold may be a legal limit.
  • the predetermined threshold may be 0.7 W/ft 2 for normal spaces and 0.64W/ft 2 for office spaces.
  • the control unit 110 may receive, or have access to, predetermined information on the power consumption of the plurality of light sources 110, for each individual light source.
  • the control unit 110 may also be configured to detect the power consumption of the plurality of light sources 110.
  • the control unit may obtain directly, or indirectly, the power consumption of the plurality of light sources 110, by measuring the power consumption for the plurality of light source 110.
  • the control unit 110, or a connected detector may obtain information about the power consumption of the individual light sources of the plurality of light sources 110 and compare it to information about the power consumption of individual light sources at different usage percentage.
  • usage percentage it is here meant a light source’s percentage of its maximum capability.
  • Fig. lb shows a graph illustrating the relation between the power consumption and the predetermined criterion(s).
  • the predetermined criterion(s) may be the brightness of a lighting system as described in Fig. la.
  • Fig. lb shows on the vertical axis, power consumption.
  • the power consumption is the total power consumption of the plurality of light sources of a lighting system as described in Fig. la.
  • Fig. lb shows, on the horizontal axis, the predetermined criterion(s).
  • the graph shows a mode of operation with a correlation between the power consumption and the predetermined criterion(s).
  • the mode of operation may be a mode in which the lighting system, as described e.g. in Fig. la, may be operated with a set relation between the power consumption and the predetermined criterion(s).
  • the graph illustrates how a control unit, as described in Fig. la, controls the property(ies) of the first output and/or the second light output while keeping the power consumption under the predetermined threshold.
  • Fig. lb it can be seen in the mode of operation that the value of the predetermined criterion(s) may be increased up until a level B, e.g. by increasing the intensity of the light output of the plurality of light sources.
  • the level B may be a certain brightness value.
  • the graph illustrates in the mode of operation how the power consumption is kept below a predetermined threshold of the power consumption, A, of the plurality of light sources after the predetermined criterion(s) reaches the level B. Because then the predetermined criterion(s) is increased by controlling a property(ies) of the first light output and/or the second light output without increasing the power consumption.
  • the graph illustrates how the lighting system according to exemplifying embodiments of the present invention allows the predetermined criterion(s) to be increased above a level/value, B, without increasing the power consumption of the plurality of light sources above the predetermined threshold, A.
  • Fig. 2 schematically shows a lighting system according to an exemplifying embodiment of the present invention.
  • the lighting system 100 comprises a plurality of light sources 110, arranged to provide a light output arranged to fulfil at least one predetermined criterion.
  • the plurality of light sources 100 comprises at least one first light source 112 arranged to provide a first light output, and at least one second light source 114 arranged to provide a second light output. At least one property of the second light output is different from at least one property of the first light output.
  • the lighting system 100 further comprises a control unit 120.
  • the control unit 120 is connected to the plurality of light source 110.
  • the control unit 120 is configured to obtain a power consumption of the plurality of light sources 110.
  • the control unit 120 is further configured to control, in case the obtained power consumption of the plurality of light sources 110 reaches a predetermined threshold of the power consumption, at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources 110 below the predetermined threshold of the power consumption while providing the light output, fulfilling the predetermined criterion(s), from the plurality of light sources 110.
  • the lighting system 100 further comprises a light control 130.
  • the light control 130 is connected to the control unit 120 and is configured to be operated by a user.
  • the light control 130 may be any kind of switch, slider, dimmer or regulator that is configured to set the at least one predetermined criterion of the light output.
  • the light control 130 may be connected to the control unit via wiring or wirelessly.
  • the light control 130 may be configured to set the predetermined criterion(s) of the light output upon operation of the light control 130 by the user.
  • the property(ies) of the first light source(s) 112 and the second light source(s) 114 comprise(s) at least one of wavelength, co, and intensity, I.
  • the at least one property of the at least one first light source 112 comprises a first wavelength, coi, and a first intensity, Ii.
  • the at least one property of the at least one second light source 112 comprises a second wavelength, C02, and a second intensity, I2, wherein on C02.
  • the first light output may comprise blue light in a wavelength range of 380-500 nm
  • the second light output may comprise light of a different colour/wavelength than the first light output.
  • the first intensity, Ii, and the second intensity, I2 may be changed by the control unit 120, e.g. by distributing power differently between the at least one first light source 112 and the at least one second light source 114.
  • the control unit 120 By changing the power distributed to the at least one first light source 112 and the at least one second light source 114 via the control unit 120, the respective intensity of the first and second light output changes.
  • the lighting system 100 may provide a light output fulfilling at least one predetermined criterion, e.g. brightness, while keeping the power consumption of the plurality of light sources 110 below the predetermined threshold, by controlling at least one of the first and second intensity, Ii I2 .
  • Fig. 3 schematically show a lighting system 100 similar to the lighting system 100 in Fig. 2.
  • a detailed description of features common to the embodiment illustrated in Fig. 2 has been omitted for the sake of brevity and conciseness.
  • the plurality of light sources 100 further comprises at least four different light sources, with a respective wavelength, coi, C02, (03 and C04, and a respective individually controllable intensity, Ii, I2, 13, 14. At least one wavelength of coi, C02, (03 and C04 is different from the other three wavelengths. At least one of the intensities, Ii, I2, 13 and I4, may be controlled by the control unit 120 in order to change the power consumption of the plurality of light sources 110, such that the power consumption of the plurality of light sources 110 stay below the predetermined threshold, which may be a legal limit for the room/space the lighting system 100 is arranged in.
  • a user may interact with the light control 130, setting the predetermined criterion, e.g. a desired brightness/perceived brightness, for the light output of the plurality of light sources 110.
  • the control unit 120 thereafter controls the properties of the individual light sources of the plurality of light sources 110, such that the power consumption 110 is kept below the predetermined threshold, e.g. within legal limits, and still provides the desired brightness.
  • the lighting system 100 may keep the power consumption of the plurality of light sources 110 constant, just at the legal limit, while still increasing the brightness to the desired value set by the user interacting with the light control 130.
  • the increase in brightness may be performed by controlling the individual light outputs of the plurality of light sources 110.
  • the brightness may be adjusted by changing the intensity, Ii, of a first light source, with wavelength coi,of the plurality of light sources 110 and the intensity of a second light source, with a wavelength C02, of the plurality of light sources 110, wherein coi C02.
  • the colour and/or the brightness of the overall light output of the plurality of light sources 110 may change when an intensity of a light source of the plurality of light sources 110 is changed.
  • the intensity of a light source of the plurality of light sources 110 may be changed e.g. by distributing power differently between the plurality of light sources 110.
  • the control unit 120 may control any one of the individual light sources of the plurality of light sources 110 individually, e.g. in terms of intensity.
  • Fig. 4 schematically shows a method for controlling a lighting system according to exemplifying embodiments of the present invention.
  • the method 300 comprises providing 310, by the plurality of light sources, a light output arranged to fulfil at least one predetermined criterion.
  • the method 300 further comprises obtaining 320 a power consumption of the plurality of light sources.
  • the method 300 further comprises determining 330 if the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, and in case the power consumption of the plurality of light sources reaches the predetermined threshold of the power consumption.
  • the method 300 further comprises controlling 340 at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources.

Abstract

A lighting system, comprising a plurality of light sources arranged to provide a light output arranged to fulfil at least one predetermined criterion, comprising a first light source and a second light source, arranged to provide a first and second light output. A property of the first light output is different from a property of the second light output. The lighting system comprises a control unit, wherein the control unit is configured to obtain a power consumption of the plurality of light sources, and control, in case the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output.

Description

Lighting system comprising a control unit and method for controlling a lighting system
FIELD OF THE INVENTION
The present invention generally relates to lighting system. More specifically, the present invention is related to a lighting system for controlling a plurality of light sources.
BACKGROUND OF THE INVENTION
Today there is an increasing interest in specialized lighting systems and arrangements, such as an organized set of different lamps using e.g. the versatility of LEDs in order to create a customized lighting scene involving multiple lamps with different lighting characteristics.
Lighting systems involving a plurality of light sources are often controlled using control devices, in order to create a desired lighting. The development of coordinated lighting systems is of increasing interest, in which a plurality of different lamps and control devices are used, in order to create a desired overall lighting scene, e.g. for a specific room or space. These control devices may include one or more light controls, such as normal switches, and/or digital solutions where multiple lamps can be controlled from a single display.
Lighting systems of this kind are growing in complexity and in its variety, and it will be appreciated that the systems may use many different light sources of different colours and intensity to create an overall desired light scene. There are today multiple solutions for how property(ies) of light, e.g. the colour and intensity of light, may be controlled, based on the needs of a user. For example, there are methods which correlate colour and intensity in order to provide a desired lighting for a human.
US 20100296285 Al discloses a method and system provided for designing improved intelligent, LED based lighting systems. The LED based lighting systems may include fixtures with one or more of rotatable LED light bars, integrated sensors, onboard intelligence to receive signals from the LED light bars and control the LED light bars, and a mesh network connectivity to other fixtures. The method may further include storing a plurality of energy demand parameters wherein each of the plurality of energy demand parameters may be associated with a lighting regulation parameter such that when energy demand information is provided, at least one lighting system may be controlled in accordance with the lighting regulation parameter. This energy demand parameter may relate to utility energy demand and/or alternate energy demand.
The more complex these systems become, the more problematic it becomes to control them in an efficient and precise manner. Furthermore, considerations regarding limitations set by building regulations and other legal limitations are becoming more important in the society of today, with increased usage of electrical appliances, lamps, and gadgets.
Hence, it is an object of the present invention to provide alternatives to the systems of the prior art in order to improve the control of these systems.
SUMMARY OF THE INVENTION
It is of interest to provide alternatives to the lighting systems of the prior art in order to provide lighting systems with an improved control and energy efficiency.
This and other objects are achieved by providing a lighting system and a method for controlling a lighting system having the features in the independent claims. Preferred embodiments are defined in the dependent claims.
Hence, according to a first aspect of the present invention, there is provided a lighting system. The lighting system comprises a plurality of light sources arranged to provide a light output arranged to fulfil at least one predetermined criterion. The plurality of light sources comprises at least one first light source arranged to provide a first light output, and at least one second light source arranged to provide a second light output, wherein at least one property of the first light output is different from at least one property of the second light output. The lighting system further comprises a control unit connected to the plurality of light sources. The control unit is configured to obtain a power consumption of the plurality of light sources, and control, in case the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources.
According to a second aspect of the present invention, there is provided a lighting arrangement, comprising a lighting system according to the first aspect of the present invention, a first luminaire comprising the at least one first light source, and a second luminaire comprising the at least one second light source.
According to a third aspect of the present invention, there is provided a method for controlling a lighting system, wherein the lighting system comprises a plurality of light sources comprising at least one first light source arranged to provide a first light output and at least one second light source arranged to provide a second light output, wherein at least one property of the first light output is different from at least one property of the second light output. The method comprises providing, by the plurality of light sources, a light output arranged to fulfil at least one predetermined criterion. The method further comprises obtaining a power consumption of the plurality of light sources. The method further comprises determining if the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, and in case the power consumption of the plurality of light sources reaches the predetermined threshold of the power consumption, controlling at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources.
Thus, the first, second and third aspect of the present invention are based on the common concept or idea of providing a lighting system or method for controlling a lighting system wherein a plurality of light sources are controlled in order to keep the power consumption of the plurality of light sources below a predetermined threshold, while still providing a light output fulfilling one or more predetermined criterions. Hence, the first, second and third aspect of the present invention share a common general inventive concept of providing a light output fulfilling (a) certain criterion(s) while keeping the power consumption of the plurality of light sources below a threshold, by controlling property(ies) of the first light source(s) and property(ies), different from the property(ies) for the first light source(s), of the at least one second light source. This allows the lighting system to provide a light output fulfilling (a) predetermined criterion(s) by changing one or more properties of individual light sources, or sets of light sources, in the lighting system.
It will be appreciated that the lighting system can keep the power consumption below the predetermined threshold even if the at least one predetermined criterion would imply that the power consumption of the plurality of light sources needs to go above the predetermined threshold of the power consumption in order to provide a desired light output. By controlling at least one property of the at least one first light source, and at least one property of the at least one second light source, the predetermined criterion may be fulfilled, while the power consumption of the plurality of light sources are kept at, or below, the predetermined threshold of the power consumption.
It will be further appreciated that the lighting system can be more energy efficient. The system may be more energy efficient because the plurality of light sources may be individually controlled in order to provide a light output for the plurality of light sources with the predetermined condition(s) fulfilled while keeping the power consumption below the predetermined threshold. Thus, a lighting system is provided which allows energy to be used in an efficient manner when providing a light output with the predetermined criterion(s) fulfilled while not surpassing the predetermined threshold of the power consumption.
Hence, the lighting system provides a desired overall light output, fulfilling at least one predetermined criterion, e.g. for a room, by automatically controlling properties of individual light outputs, while still complying with the power consumption threshold.
The lighting system according to the first aspect of the present invention comprises a plurality of light sources arranged to provide a light output arranged to fulfil at least one predetermined criterion. By the term “predetermined criterion” it is here meant any criterion associated with the light output. For example, the one or more predetermined criterions may be, or be related to, physical properties of the light output. According to another example, the predetermined criterion(s) may be, or be related to, intangible properties such as perceived brightness/intensity which are related to both physical properties of the light and human physiology. The predetermined criterion may furthermore be a desired characteristic of the light output.
The plurality of light sources, in its turn, comprises at least one first light source arranged to provide a first light output, and at least one second light source arranged to provide a second light output. At least one property of the first light output is different from at least one property of the second light output. By the term “light output” it is here meant the total light being emitted by the first and second light sources. By the term “property” it is here meant any physical property of the light being emitted, such as intensity or color/wavelength.
The plurality of light sources may all be part of one luminaire, or they may be arranged in different luminaires. For example, the at least one first light source may be part of one first luminaire having a certain light output, and the at least one second light source may be part of a different luminaire having a different light output than the at least one first light output, in terms of lighting characteristics. The plurality of light sources may be substantially any type of light source which allows at least one property to be changed. For example, a light source may be a light-emitting diode, LED, light source.
The lighting system further comprises a control unit connected to the plurality of light sources. By the term “control unit”, it is here meant substantially any unit, device, arrangement, or the like, which is configured and/or arranged to control the plurality of light sources. By the term “connected” it is here meant, but not limited to, coupled, or linked together, such that e.g. a real or notional link is established.
The control unit is configured to obtain a power consumption of the plurality of light sources. By the wording “the control unit is configured to obtain”, it is here meant any action which allows the control unit to receive information regarding the power consumption of the plurality of light sources.
The control unit is further configured to control, in case the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, at least one property of the first light output and the second light output, in order to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption, while still providing the light output. By the term “predetermined threshold” it is here meant a limit, such as a maximum limit, of the power consumption. Hence, in case the obtained power consumption of the plurality of light sources reaches a (maximum) threshold or limit, the control unit is configured to control the property(ies) of the first and/or the second light outputs for keeping the power consumption below the threshold/limit whilst providing the light output fulfilling the predetermined criterion(s).
According to an embodiment of the present invention, the control unit is configured to control the at least one property of at least one of the first light output and the second light output by a distribution of power between the at least one first light source and the at least one second light source. By the term “distribution of power” it is here meant how the power is allocated, to e.g. different light sources. For example, the property(ies) of the first light output may be changed by reducing the power used by the first light source(s) and distribute the power being taken from the first light source(s) to the second light source(s). The present embodiment is advantageous in that the property of the at least one light source and the at least one second light source may be changed only by adjusting the distribution of power. In other words, the light output of separate light sources may be adjusted by the control unit by a distribution of the power differently while still keeping the power consumption below the predetermined threshold and providing a light output fulfilling at least one predetermined criterion.
According to an embodiment of the present invention, the at least one property of at least one of the first light output and the second light output comprises at least one of wavelength and intensity. The present embodiment is advantageous in that the control unit may be configured to maintain the power consumption of the plurality of light sources below the predetermined threshold by adjusting the wavelength and/or intensity of the fist and/or second light output. In other words, the wavelength and/or intensity may be adjusted by the control unit for separate light sources in order to keep the power consumption below the predetermined threshold while still providing a light output fulfilling a predetermined criterion.
According to an embodiment of the present invention, the lighting system further comprises a light control connected to the control unit, wherein the light control is configured to be operated by a user. By the term “light control”, it here meant substantially any device, unit, or the like for light control, such as a knob, a user interface, a switch, etc. The present embodiment is advantageous in that it allows a user to provide input to the lighting system.
According to an embodiment of the first aspect of the present invention, the light control is configured to set the at least one predetermined criterion of the light output upon operation of the light control by the user. The present embodiment is advantageous in that it provides a lighting system which allows a user to control the at least one predetermined criterion, and automatically keeps the power consumption below the predetermined threshold.
According to an embodiment of the first aspect of the present invention, the at least one predetermined criterion of the light output is configured to change with time. The present embodiment is advantageous in that the light output can automatically be adjusted based on the time of day, e.g. such that it automatically correlates with a human’s circadian rhythm.
According to an embodiment of the present invention, the at least one predetermined criterion comprises a criterion associated with the brightness of the light output. The present embodiment is advantageous in that the light output fulfilling the predetermined criterion may provide a brightness which may be controlled by changing a property of at least one of the first light output and the second light output without increasing the power consumption. By the term “brightness” it is here meant the perceived brightness, which is associated not only with the physical properties of the light, but also by biological factors in the human body which determines how bright something is perceived.
According to an embodiment of the present invention, the control unit is configured to control at least one of the first light output and the second light output while keeping the power consumption of the plurality of light sources constant. The present embodiment is advantageous in that the lighting system can keep the power consumption constant while providing a light output fulfilling a predetermined criterion, by controlling at least one property of at least one of the first light source and the at least one second light source. The present embodiment is advantageous in that it allows the lighting system to change the light output of the plurality of light sources without increasing the power consumption.
According to an embodiment of the present invention, the first light output comprises blue light in a wavelength range of 380-500 nm, and the second light output comprises light of a different colour than the first light output. The present embodiment is advantageous in that blue light may provide a higher perceived brightness than other colours. Consequently, the blue light may affect the human body by activating it, e.g. by influencing the body’s circadian rhythm. For example, the blue light may reduce secretion of the sleep hormone melatonin, and thus influence the circadian rhythm. This interaction between the human body and different wavelengths of the light output allows the light output to have a higher perceived brightness without increasing the power consumption of the plurality of lights.
According to an embodiment of the present invention, the power consumption of the plurality of light sources is predetermined. The power consumption of the plurality of light sources may be determined in advance by e.g. performing practical experiments or theoretical calculations, manually by a person or automatically by e.g. a computer. The present embodiment is advantageous in that the power consumption of the plurality of light sources is known, resulting in a faster, more efficient, and more precise control of the power consumption.
According to an embodiment of the present invention, the control unit is connected to the first luminaire and the second luminaire, and wherein the control unit is configured to individually control the first luminaire and the second luminaire. The present embodiment is advantageous in that the lighting system may control at least two different luminaires separately, allowing improved control of the first and second light outputs and the power consumption. According to an embodiment of the present invention, wherein the controlling of the at least one property of at least one of the first light output and the second light output is performed by a distribution of power between the at least one first light source and the at least one second light source.
According to an embodiment of the present invention, the controlling of the at least one property of at least one of the first light output and the second light output is performed while keeping the power consumption of the plurality of light sources constant.
Further objectives of, features of, and advantages with, the present invention will become apparent when studying the following detailed disclosure, the drawings and the appended claims. Those skilled in the art will realize that different features of the present invention can be combined to create embodiments other than those described in the following.
BRIEF DESCRIPTION OF THE DRAWINGS
This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention.
Fig. la schematically shows a lighting system according to an exemplifying embodiment of the present invention.
Fig. lb shows a graph illustrating the relation between the power consumption and a predetermined criterion according to exemplifying embodiments of the present invention.
Fig. 2 schematically shows a lighting system according to an exemplifying embodiment of the present invention.
Fig. 3 schematically shows a lighting system according to an exemplifying embodiment of the present invention.
Fig. 4 schematically shows a method for controlling a lighting system according to exemplifying embodiments of the present invention.
DETAILED DESCRIPTION
Fig. la schematically shows a lighting system 100 according to an exemplifying embodiment of the present invention. The lighting system 100 comprises a plurality of light sources 110. In Fig. la, the plurality of light sources 110 is exemplified as comprising (only) two light sources, a first light source 112 and a second light source 114, but it should be noted that the plurality of light sources 110 of the lighting system 100 may comprise substantially any number of light sources. The at least one first light source 112 is arranged to provide a first light output. The at least one second light source 114 is configured to provide a second light output having at least one property being different from the first light output. For example, the at least one first light source 112 may emit light with a first set of physical properties, and the at least one second light source 114 may emit light of a second set of physical properties, wherein at least one property is different between the first set and the second set. The at least one first light source 112 and the at least one second light source 114 may be arranged in the same luminaire. The plurality of light sources 110 is arranged to provide a light output arranged to fulfil at least one predetermined criterion. The predetermined criterion may be a brightness, which may be the brightness as perceived by a human. The predetermined criterion may be a desired property of the emitted light from the plurality of light sources 110 determined by e.g. user action, a function of time and/or the time of day. It is to be understood that from the wording “a light output arranged to fulfil at least one predetermined criterion” that the lighting system 100 provides a desired light output. The lighting system 100 may allow the predetermined criterion to change, e.g. a change of the brightness, by changing one or more property(ies) of the at least one first light source 112 and/or the at least one second light source 114, without having to increase the power consumption. The combined light output of the first light output and the second light output may fulfil the predetermined criterion, such as perceived brightness, without changing the power consumption of the plurality of light sources 110. In other words, the brightness may not only depend on the sum of the intensity of the different light outputs, i.e. the sum of the number of emitted photons per unit of time, but also on biological factors of the human body. This is because the human body perceives brightness not only based on intensity but also on e.g. colour.
The lighting system 100 further comprises a control unit 120. The control unit 120 is connected to the plurality of light sources 110. The control unit 120 may be connected to the plurality of light sources 110 via wiring and/or wirelessly. The control unit 120 is configured to obtain a power consumption of the plurality of light sources 110. The control unit 120 is further configured to control, in case the obtained power consumption of the plurality of light sources 110 reaches a predetermined threshold of the power consumption, at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources 110 below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources 110. The control unit 120 may be configured to control the at least one property of at least one of the first light output and the second light output by a distribution of power between the at least one first light source and the at least one second light source. For example, the control unit 120 may reduce the power being distributed to the at least one first light source 112, and increase the power being distributed to the at least one second light source 114. This may be performed while the lighting system 100 provides the light output fulfilling the at least one predetermined criterion and keeping the power consumption below the predetermined threshold value. Thus, the overall light output from the plurality of light sources 110 may fulfil the at least one predetermined criterion, while at least one property of at least one of the at least one first light source 112 and the at least one second light source 114 is changed by the control unit 120, by changing the distribution of power between the light sources. The predetermined threshold of the power consumption may be determined by lighting standard and/or building rules, i.e. the predetermined threshold may be a legal limit. For example, the predetermined threshold may be 0.7 W/ft2 for normal spaces and 0.64W/ft2 for office spaces.
The control unit 110 may receive, or have access to, predetermined information on the power consumption of the plurality of light sources 110, for each individual light source. The control unit 110 may also be configured to detect the power consumption of the plurality of light sources 110. For example, the control unit may obtain directly, or indirectly, the power consumption of the plurality of light sources 110, by measuring the power consumption for the plurality of light source 110. The control unit 110, or a connected detector, may obtain information about the power consumption of the individual light sources of the plurality of light sources 110 and compare it to information about the power consumption of individual light sources at different usage percentage. By the term “usage percentage” it is here meant a light source’s percentage of its maximum capability.
Fig. lb shows a graph illustrating the relation between the power consumption and the predetermined criterion(s). The predetermined criterion(s) may be the brightness of a lighting system as described in Fig. la. Fig. lb shows on the vertical axis, power consumption. The power consumption is the total power consumption of the plurality of light sources of a lighting system as described in Fig. la. Fig. lb shows, on the horizontal axis, the predetermined criterion(s). The graph shows a mode of operation with a correlation between the power consumption and the predetermined criterion(s). The mode of operation may be a mode in which the lighting system, as described e.g. in Fig. la, may be operated with a set relation between the power consumption and the predetermined criterion(s).
The graph illustrates how a control unit, as described in Fig. la, controls the property(ies) of the first output and/or the second light output while keeping the power consumption under the predetermined threshold. In Fig. lb, it can be seen in the mode of operation that the value of the predetermined criterion(s) may be increased up until a level B, e.g. by increasing the intensity of the light output of the plurality of light sources. The level B may be a certain brightness value.
Furthermore, the graph illustrates in the mode of operation how the power consumption is kept below a predetermined threshold of the power consumption, A, of the plurality of light sources after the predetermined criterion(s) reaches the level B. Because then the predetermined criterion(s) is increased by controlling a property(ies) of the first light output and/or the second light output without increasing the power consumption.
In other words, the graph illustrates how the lighting system according to exemplifying embodiments of the present invention allows the predetermined criterion(s) to be increased above a level/value, B, without increasing the power consumption of the plurality of light sources above the predetermined threshold, A.
Fig. 2 schematically shows a lighting system according to an exemplifying embodiment of the present invention. The lighting system 100 comprises a plurality of light sources 110, arranged to provide a light output arranged to fulfil at least one predetermined criterion. The plurality of light sources 100 comprises at least one first light source 112 arranged to provide a first light output, and at least one second light source 114 arranged to provide a second light output. At least one property of the second light output is different from at least one property of the first light output.
The lighting system 100 further comprises a control unit 120. The control unit 120 is connected to the plurality of light source 110. The control unit 120 is configured to obtain a power consumption of the plurality of light sources 110. The control unit 120 is further configured to control, in case the obtained power consumption of the plurality of light sources 110 reaches a predetermined threshold of the power consumption, at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources 110 below the predetermined threshold of the power consumption while providing the light output, fulfilling the predetermined criterion(s), from the plurality of light sources 110. The lighting system 100 further comprises a light control 130. The light control 130 is connected to the control unit 120 and is configured to be operated by a user. The light control 130 may be any kind of switch, slider, dimmer or regulator that is configured to set the at least one predetermined criterion of the light output. The light control 130 may be connected to the control unit via wiring or wirelessly. The light control 130 may be configured to set the predetermined criterion(s) of the light output upon operation of the light control 130 by the user.
In Fig. 2, the property(ies) of the first light source(s) 112 and the second light source(s) 114 comprise(s) at least one of wavelength, co, and intensity, I. The at least one property of the at least one first light source 112 comprises a first wavelength, coi, and a first intensity, Ii. The at least one property of the at least one second light source 112 comprises a second wavelength, C02, and a second intensity, I2, wherein on C02. For example, the first light output may comprise blue light in a wavelength range of 380-500 nm, and the second light output may comprise light of a different colour/wavelength than the first light output.
In Fig. 2, the first intensity, Ii, and the second intensity, I2, may be changed by the control unit 120, e.g. by distributing power differently between the at least one first light source 112 and the at least one second light source 114. By changing the power distributed to the at least one first light source 112 and the at least one second light source 114 via the control unit 120, the respective intensity of the first and second light output changes. Hence, the lighting system 100 may provide a light output fulfilling at least one predetermined criterion, e.g. brightness, while keeping the power consumption of the plurality of light sources 110 below the predetermined threshold, by controlling at least one of the first and second intensity, Ii I2 .
Fig. 3 schematically show a lighting system 100 similar to the lighting system 100 in Fig. 2. As many features of the configuration and operation of the lighting system 100 is substantially similar to that described in Fig. 2, a detailed description of features common to the embodiment illustrated in Fig. 2 has been omitted for the sake of brevity and conciseness.
In Fig. 3, the plurality of light sources 100 further comprises at least four different light sources, with a respective wavelength, coi, C02, (03 and C04, and a respective individually controllable intensity, Ii, I2, 13, 14. At least one wavelength of coi, C02, (03 and C04 is different from the other three wavelengths. At least one of the intensities, Ii, I2, 13 and I4, may be controlled by the control unit 120 in order to change the power consumption of the plurality of light sources 110, such that the power consumption of the plurality of light sources 110 stay below the predetermined threshold, which may be a legal limit for the room/space the lighting system 100 is arranged in.
In Fig. 3, a user may interact with the light control 130, setting the predetermined criterion, e.g. a desired brightness/perceived brightness, for the light output of the plurality of light sources 110. The control unit 120 thereafter controls the properties of the individual light sources of the plurality of light sources 110, such that the power consumption 110 is kept below the predetermined threshold, e.g. within legal limits, and still provides the desired brightness. The lighting system 100 may keep the power consumption of the plurality of light sources 110 constant, just at the legal limit, while still increasing the brightness to the desired value set by the user interacting with the light control 130. The increase in brightness may be performed by controlling the individual light outputs of the plurality of light sources 110. For example, the brightness, may be adjusted by changing the intensity, Ii, of a first light source, with wavelength coi,of the plurality of light sources 110 and the intensity of a second light source, with a wavelength C02, of the plurality of light sources 110, wherein coi C02. Hence, the colour and/or the brightness of the overall light output of the plurality of light sources 110 may change when an intensity of a light source of the plurality of light sources 110 is changed. The intensity of a light source of the plurality of light sources 110 may be changed e.g. by distributing power differently between the plurality of light sources 110. It is to be understood that the control unit 120 may control any one of the individual light sources of the plurality of light sources 110 individually, e.g. in terms of intensity.
Fig. 4 schematically shows a method for controlling a lighting system according to exemplifying embodiments of the present invention. The method 300 comprises providing 310, by the plurality of light sources, a light output arranged to fulfil at least one predetermined criterion. The method 300 further comprises obtaining 320 a power consumption of the plurality of light sources. The method 300 further comprises determining 330 if the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, and in case the power consumption of the plurality of light sources reaches the predetermined threshold of the power consumption. The method 300 further comprises controlling 340 at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources.

Claims

CLAIMS:
1. A lighting system (100), comprising a plurality of light sources (110) arranged to provide a light output arranged to fulfil at least one predetermined criterion, comprising a first luminaire comprising at least one first light source (112) arranged to provide a first light output, and a second luminaire comprising at least one second light source (114) arranged to provide a second light output, wherein at least one property of the first light output is different from at least one property of the second light output, a control unit (120) connected connected to the first luminaire and the second luminaire, and wherein the control unit is configured to individually control the first luminaire and the second luminaire, and wherein the control unit is configured to obtain a power consumption of the plurality of light sources, and control, in case the obtained power consumption of the plurality of light sources reaches a predetermined threshold of the power consumption, at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources, and a light control (130) connected to the control unit, wherein the light control is configured to be operated by a user, wherein the light control is configured to set the at least one predetermined criterion of the light output upon operation of the light control by the user.
2. The lighting system according to claim 1, wherein the control unit is configured to control the at least one property of at least one of the first light output and the second light output by a distribution of power between the at least one first light source and the at least one second light source.
3. The lighting system according to claim 1 or 2, wherein the at least one property of at least one of the first light output and the second light output comprises at least one of wavelength and intensity.
4. The lighting system according to any one of the preceding claims, wherein the at least one predetermined criterion of the light output is configured to change with time.
5. The lighting system according to any one of the preceding claims, wherein the at least one predetermined criterion comprises a criterion associated with the brightness of the light output.
6. The lighting system according to any one of the preceding claims, wherein the control unit is configured to control at least one of the first light output and the second light output while keeping the power consumption of the plurality of light sources constant.
7. The lighting system according to any one of the preceding claims, wherein the first light output comprises blue light in a wavelength range of 380-500 nm, and the second light output comprises light of a different colour than the first light output.
8. The lighting system according to any one of the preceding claims, wherein the power consumption of the plurality of light sources is predetermined.
9. A method (300) for controlling a lighting system, wherein the lighting system comprises a first luminaire comprising at least one first light source arranged to provide a first light output and a first luminaire comprising at least one second light source arranged to provide a second light output, wherein at least one property of the first light output is different from at least one property of the second light output, wherein the lighting system further comprises a light control configured to be operated by a user, wherein the method comprises providing (310), by the plurality of light sources, a light output arranged to fulfil at least one predetermined criterion, wherein the at least one predetermined criterion of the light output is set upon operation of the light control by the user, obtaining (320) a power consumption of the plurality of light sources, determining (330) if the obtained power consumption of the plurality of light 16 sources reaches a predetermined threshold of the power consumption, and in case the power consumption of the plurality of light sources reaches the predetermined threshold of the power consumption, controlling (340) at least one property of at least one of the first light output and the second light output, to keep the power consumption of the plurality of light sources below the predetermined threshold of the power consumption while providing the light output, fulfilling the at least one predetermined criterion, from the plurality of light sources.
10. The method according to claim 9, wherein the controlling of the at least one property of at least one of the first light output and the second light output is performed by a distribution of power between the at least one first light source and the at least one second light source.
11. The method according to any one of claims 9 to 10, wherein the controlling of the at least one property of at least one of the first light output and the second light output is performed while keeping the power consumption of the plurality of light sources constant.
PCT/EP2022/087701 2022-01-11 2022-12-23 Lighting system comprising a control unit and method for controlling a lighting system WO2023135003A1 (en)

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EP2312569A2 (en) * 2009-10-16 2011-04-20 Samsung Electronics Co., Ltd. Method and apparatus for controlling power consumption of light source in mobile projector
JP2012183014A (en) * 2011-03-04 2012-09-27 Panasonic Corp Plant disease damage preventive lighting device
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