Load flicker correction for luminaires

Abstract

A method of operating a luminaire, the luminaire comprising or coupled to a battery, the battery coupled to a mains grid via a grid charging unit, and the luminaire comprising or coupled to a solar unit; the method includes: detecting whether a condition indicative of a lighting condition in an environment of the luminaire is below a predetermined threshold; determining whether the battery is being charged; detecting a load flicker of the luminaire if a condition indicative of the lighting condition is detected to be below a predetermined threshold and if it is determined that the battery is being charged, where the load flicker is attributable to a load ripple through the battery, where the load ripple is due to coupling of the battery with the grid charging unit; and correcting the load flicker of the luminaire if the load flicker of the luminaire is detected.

Description

Technical Field

[0001] The present disclosure generally relates to load flicker in luminaires. Certain embodiments relate to operating the luminaire to correct for such load flicker. Background Art

[0002] Some modern luminaires contain or are coupled with batteries and a solar cell (the solar cell includes one or more solar panels and a solar charge controller that couples the solar panels to the battery). Power from the solar cell can be used to charge the battery during the day, and power can be drawn from the battery during the night (i.e., after dusk) to output light from the luminaire's light unit (such as an LED (light emitting diode) or LED array).

[0003] Sometimes, the operator may add a mains charging unit for charging the battery during the night to avoid a blackout in which the luminaire will not output light during the night. Such a mains charging unit is typically installed later as an external component and is typically coupled directly to the battery.

[0004] However, such mains charging units are not suitable for optimal charging of the batteries, but luminaires are generally compatible with mains charging units and their use is permitted as this is considered to be more user-friendly for the operator.

[0005] However, coupling such a mains charging unit to the battery is equivalent to coupling the mains grid to the battery, which may create ripples in the battery charging voltage and thus in the load output and in the light output, which may be unpleasant for a user of the luminaire.

[0006] US2018238563 A1 relates to the efficient use of solar photovoltaic energy. The problem addressed by this document is to alleviate the problems associated with using photovoltaic energy to provide AC and DC power to a water heating unit. US2018238563 A1 provides a technique for preferentially delivering energy from a variable energy source to an internal consumption system before the utility grid is fed in.

[0007] WO2018007182 A1 relates to a lighting and power control system with increased dynamic response for improving light quality. WO2018007182 A1 aims to reduce ripple components by using a notch filter configured to filter out ripple frequencies in a regulated current output provided to a load. Summary of the Invention

[0008] It is therefore an aim of at least some embodiments of the present disclosure to address this problem.

[0009] Therefore, in a first aspect of the present disclosure, a method of operating a luminaire is provided. The luminaire may include a battery or may be coupled to a battery, and the battery may be coupled to a mains electricity grid via a grid charging unit. The luminaire may include a solar cell or may be coupled to a solar cell. The method may include: - detecting whether a condition indicative of lighting conditions (e.g. any one or more of dusk, darkness, night, etc.) in the environment of the luminaire is below a predetermined threshold; - Determine if the battery is being charged; - if a condition indicative of a lighting condition below a predetermined threshold is detected, and if it is determined that the battery is being charged, detecting a load flicker of the lighting, wherein the load flicker is attributable to a load ripple through the battery, wherein the load ripple is due to coupling the battery to a grid charging unit; and - If load flicker of a luminaire is detected, correcting the load flicker of the luminaire.

[0010] Note that the solar unit may include one or more solar panels and a solar charge controller that couples the solar panels to a battery, but those skilled in the art will appreciate that this is not essential for understanding the above-described method embodiments, which only require that the luminaire be coupled to the utility grid via a grid charging unit and either include or be coupled to a solar unit, and either include or be coupled to a battery. It should also be understood that the luminaire may include a light unit configured to output light, and examples of such a light unit may include an LED (light emitting diode) or an LED array containing a plurality of LEDs. The grid charging unit can be considered an element external to the luminaire, as it is typically directly coupled to the battery and is not part of the luminaire itself. Of course, the logical decisions and operations performed by the luminaire may be performed by a controller. Such a controller may form part of the luminaire and may, for example, include a computer processor and memory, or may, for example, be a dedicated electronic hardware component. In another exemplary embodiment, such a controller may not be embodied within the luminaire, but may instead be a remote (e.g., cloud-based) computer processor with associated memory.

[0011] The expression "condition being indicative of a lighting condition" may be used to refer to a parameter or an indication of external conditions being representative of the light intensity in the surroundings / environment of the luminaire.

[0012] In one embodiment, the method may include maintaining the output state of the luminaire (ie the light output setting of the light unit) if no load flicker of the luminaire is detected or if it is determined that the battery is not being charged.

[0013] It should be understood that luminaires typically have an output state (i.e., a light output setting) that indicates whether the luminaire is emitting light (or, more precisely, whether the luminaire's light unit is emitting light). Furthermore, in a higher-level model of the luminaire's state, additional output states (e.g., an activated or deactivated state, i.e., a warm-up or cool-down state, respectively) or any other relevant states may be considered. It is well known that a luminaire (or, more precisely, a luminaire's light unit) can emit light by driving a load, such as an LED load. This means that the luminaire's output state is determined by whether the load is being driven (and, in a higher-level model, how it is being driven). This, in turn, means that the luminaire's output state is affected by the electrical conditions experienced by the load (such as load ripple, which is a variation in the voltage or current applied to the load). This can result in changes in the luminaire's output state that may or may not be perceptible to the human eye or even to a digital camera with a specific shutter frequency. In this case, the luminaire may, for example, experience load flicker, a condition in which the light output from the luminaire varies by periodically increasing and decreasing intensity (and optionally color). If this effect is very noticeable to the human eye and / or to a digital camera with a certain shutter frequency, then this effect on the output state of the luminaire is generally undesirable. However, if this effect is imperceptible, then the output state of the luminaire can be maintained, which means that the light output can be maintained even in the presence of load ripple on the load, as the load ripple may be considered unimportant to the end user of the luminaire.

[0014] In one embodiment, the method may include: - If no conditions are detected indicating that the lighting condition is below a predetermined threshold, and if it is determined that the battery is being charged, adjusting the charging profile of the battery of the luminaire so as to increase the power drawn from the grid charging unit.

[0015] In one embodiment, the condition indicative of a lighting condition being below a predetermined threshold is detected by detecting a lack of photovoltaic current reaching the battery from the solar unit.

[0016] In one embodiment, the condition indicating that the lighting condition is below a predetermined threshold is detected by consulting a predefined schedule and using a time of day clock.

[0017] In one embodiment, the step of determining whether the battery is being charged is performed by measuring the state of charge of the battery to determine whether the battery voltage is increasing.

[0018] In one embodiment, the step of detecting a flicker in the load of the luminaire comprises detecting a load current ripple that deviates from a load current setting by more than 3.5 percent, preferably more than 5 percent.

[0019] In one embodiment, the predetermined threshold represents a demarcation between daytime with higher lighting conditions and nighttime with lower lighting conditions.

[0020] In one embodiment, the predetermined threshold varies depending on the day and / or season.

[0021] Furthermore, in a second aspect of the present disclosure there is provided a computer program comprising instructions which, when the program is executed by a computer, cause the computer to perform the method of any preceding claim.

[0022] Furthermore, in a third aspect of the present disclosure, there is provided a computer-readable storage medium comprising instructions, which, when executed by a computer, cause the computer to perform the method according to any of the above embodiments.

[0023] Furthermore, in a fourth aspect of the present disclosure, there is provided a computer device comprising a processor and a memory, the memory storing instructions which, when executed by the processor, cause the computer device to perform the method according to any of the above embodiments.

[0024] In addition, in a fifth aspect of the present disclosure, a luminaire is provided, comprising a battery or coupled to a battery, the battery being coupled to a mains grid via a grid charging unit, and the luminaire comprising a solar unit or coupled to a solar unit; wherein the luminaire comprises a controller, the controller being configured to cause the luminaire to perform a method according to any of the above embodiments.

[0025] Those skilled in the art will appreciate that the various considerations and advantages applicable to various embodiments of the method may similarly apply, mutatis mutandis, to various embodiments of the computer program, computer-readable storage medium, computer device, and luminaire. In particular, any one or more steps of the method embodiments described herein may correspond to logic and / or hardware in any referenced element.

[0026] Additionally, in another aspect of the present disclosure, a method of operating a luminaire is provided. The luminaire may include a battery or may be coupled to a battery, and the battery may be coupled to a mains power grid via a grid charging unit. The luminaire may include a solar cell or may be coupled to a solar cell. The method may include: - detecting whether a condition indicative of lighting conditions (e.g. any one or more of dusk, darkness, night, etc.) in the environment of the luminaire is below a predetermined threshold; - Determine if the battery is being charged; - if a condition indicative of a lighting condition below a predetermined threshold is detected, and if it is determined that the battery is being charged, detecting a load flicker of the lighting, wherein the load flicker is attributable to a load ripple through the battery, wherein the load ripple is due to coupling the battery to a grid charging unit; and - If no load flickering of the luminaire is detected, or if it is determined that the battery is not being charged, maintaining the output state (ie light output setting) of the luminaire.

[0027] Additionally, in another aspect of the present disclosure, a method of operating a luminaire is provided. The luminaire may include a battery or may be coupled to a battery, and the battery may be coupled to a mains power grid via a grid charging unit. The luminaire may include a solar cell or may be coupled to a solar cell. The method may include: - detecting whether a condition indicative of lighting conditions (e.g. any one or more of dusk, darkness, night, etc.) in the environment of the luminaire is below a predetermined threshold; - Determine if the battery is being charged; - If no conditions are detected indicating that the lighting condition is below a predetermined threshold, and if it is determined that the battery is being charged, adjusting the charging profile of the battery of the luminaire so as to increase the power drawn from the grid charging unit.

[0028] It will be appreciated that any of the considerations and advantages applied to the above-described more detailed embodiments of the method of the first aspect of the disclosure may be similarly applied to further developed embodiments of the additionally provided methods of the other aspects recited directly above.

[0029] Furthermore, it should be understood that in certain embodiments of any of the methods described above, the method may be computer-implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present disclosure and the above-described embodiments may be more fully understood with the help of the following detailed description taken in conjunction with the accompanying drawings, in which: Figure 1 shows a flow chart schematically illustrating an embodiment of a method according to the present disclosure; and Figure 2 An embodiment of a luminaire 100 according to the present disclosure is schematically illustrated. DETAILED DESCRIPTION

[0031] Figure 1 A flow chart schematically illustrates an embodiment of a method 10 according to the present disclosure. The method is a method of operating a luminaire. The luminaire includes or is coupled to a battery, which is coupled to a mains electricity grid via a grid charging unit. The luminaire includes or is coupled to a solar cell. Reference is made here to the additional considerations regarding the details of the solar cell, the implicit presence of the light unit, and the optional presence of a controller (where any or all of these are necessarily or advantageously included in various embodiments).

[0032] The method embodiment includes the following steps.

[0033] In the first step labeled "BC ", it can be determined whether the battery is being charged. Note that the label "BC " can be used to refer to the English expression "the battery is charging " as a convenient shorthand.

[0034] If it is not determined that the battery is charging, or equivalently, if it is determined that the battery is not charging, no specific further action is required and the method embodiment can stop.

[0035] However, if it is determined that the battery is charging, the operation of the method embodiment can continue.

[0036] In the second step labeled "LC<T ", it is detected whether the condition indicating the lighting condition in the environment of the illuminator is below a predetermined threshold. Note that the label "LC<T " can be used to refer to the English expression "lighting condition is less than threshold" as a convenient shorthand.

[0037] If it is not detected that the condition indicating the lighting condition in the environment is below a predetermined threshold, or equivalently, if it is detected that the lighting condition is at or above the threshold (which is sometimes referred to as "dawn" in industry shorthand), in some embodiments no specific further action is required and the method embodiment can stop (not shown, but this would simply connect the negative "N" option from the determination "LC<T" to the "stop" node). Alternatively, in some other embodiments, a specific step labeled "ACP" can be taken to adjust the charging profile of the battery of the illuminator so as to increase the power extracted from the grid charging unit. Note that the label "ACP" can be used to refer to the English expression "adjust charging profile" as a convenient shorthand.

[0038] If it is detected that the condition indicating the lighting condition in the environment is below a predetermined threshold, or equivalently, if it is detected that the lighting condition is below the threshold (which is sometimes referred to as "dusk" in industry shorthand), the operation of the method embodiment can continue.

[0039] Note that in some further developed embodiments, the threshold and the condition can be reversed, such that the dividing line for determination becomes the question of whether the lighting condition is above rather than below a predetermined threshold. Thus, this would be equivalent to rephrasing the mathematical comparison performed in the second step as "LC>T " or "LC<=T " or "LC>=T ", depending on the selected threshold and / or on the meaning of "above" and "below" (i.e., "greater than" and "less than").

[0040] It is expressly pointed out that the order of the first and second steps can alternatively be interchanged, i.e., in some embodiments, the second step can precede the first step, while in some other embodiments, the first step can precede the second step. In some further developed embodiments, the first and second steps can alternatively be performed simultaneously, i.e., they can occur at the same time.

[0041] In the section marked "LF In the third step of the present invention, the load flicker of the luminaire is detected. The load flicker can be attributed to the load ripple through the battery, wherein the load ripple is due to the coupling of the battery with the grid charging unit, because the inherent ripple from the grid may pass through the grid charging unit, enter the battery and enter the load, thereby causing a perceptible ripple in the load output, which is called "load flicker" in the context of the luminaire. Note that the label "LF " can be used to refer to the English expression "load flicker ” as a convenient shorthand.

[0042] If no load flicker is detected, or equivalently, if no load flicker is detected, no specific further action is required and the method embodiment may stop. This is because if load flicker would be corrected, that is, if ripple would be reduced when the battery is not charging, this could deteriorate the system (battery discharge mode + load) performance when no grid charging unit is coupled to the battery.

[0043] However, if load flicker is detected, the method embodiment may proceed to the step of correcting the load flicker of the luminaire, labeled “CLF.” Note that the label “CLF” may be used to refer to the English expression “correct load flicker” as a convenient shorthand.

[0044] In other words, load flicker is only corrected, i.e., ripple is only reduced, when the mains charging unit is present during reduced lighting conditions. One advantage is that no hardware changes are required. Another advantage is that the luminaire is compatible with many readily available mains charging unit types.

[0045] Those skilled in the art will appreciate that, based on the embodiments described in the above summary of the invention and / or according to the claims, various other embodiments can be derived from the above embodiments. Furthermore, those skilled in the art will appreciate that any or all of the above logical determinations and operations can be performed by a suitable component of the luminaire (e.g., a controller, such as the controller described above).

[0046] Furthermore, in some further developed embodiments, any one of the following preferred features may be implemented.

[0047] An example of such a preferred feature is that a condition indicative of a lighting condition being below a predetermined threshold may be detected by detecting a lack of photovoltaic current from the solar cell reaching the battery.

[0048] Another example of such a preferred feature is by consulting a predefined schedule and using a time of day clock to detect a condition indicating that the lighting condition is below a predetermined threshold. This allows decisions to be made in a more predictable manner.

[0049] Another example of such a preferred feature is that the step of determining whether the battery is being charged is performed by measuring the state of charge of the battery to determine whether the battery voltage is increasing.

[0050] Another example of such a preferred feature is that the step of detecting load flicker of the luminaire comprises detecting that the load current ripple deviates from the load current setting by more than 3.5 percent, preferably more than 5 percent. This allows correction to be initiated only when it is worthwhile, i.e., only when the load flicker is perceptible to the user.

[0051] In practical implementations, load flicker correction can be performed by a PWM controller using PID (Proportional-Integral-Derivative) control. The controller can be configured to determine the PID components and generate a new factor for each grid frequency. This controller can then be configured to control the PWM of a light output driver (e.g., an LED driver) such that the ripple effect on the load is less than 3.5 percent or less than 5 percent. In this context, any suitable PID algorithm can be used, whose parameters can be the voltage V and current I for the load and battery.

[0052] Purely as an example of such a practical implementation, one skilled in the art may consider the following parameter settings to implement the PID control algorithm: Measure current and voltage parameters of both the battery and the lamp / LED load.

[0053] Battery voltage and current are used to measure battery AH (i.e. state of charge). Pled = Iled*Vled. Perror = SetPower–Pled Kp = Kfactor / SetPower Ki = 0 (or other value, as this can be adjusted as needed) Kfactor = 20 (if no load flicker is detected, and to provide a faster control loop; however, this value of Kfactor can also be other than 20) Kfactor = 5 (if load flicker is detected above a threshold of 5%, this may mean adjusting a slower control loop based on the amount of load flicker observed; however, this value of Kfactor can also be other than 5) Pout = Pout + Perror *(Kp+Ki); Set MOSFET PWM = Pout * PwmCoff. PwmCoff = 1.0 Those skilled in the art will understand that the above example parameter settings are provided merely as examples to illustrate how to correct load flicker and are not intended to unduly limit embodiments of the present disclosure.

[0054] Another example of such a preferred feature is that the predetermined threshold represents a demarcation between daytime with higher lighting conditions and nighttime with lower lighting conditions.

[0055] Another example of such a preferred feature is that the predetermined threshold value varies depending on the day and / or season.

[0056] Another example of such a preferred feature is that the load current may be measured for at least 100 cycles to better ensure that it is worthwhile to initiate correction of load flicker.

[0057] In a first exemplary embodiment, a suitable component of the luminaire (e.g., a controller or a solar unit of the luminaire) can be configured to detect a so-called "dusk" condition, i.e., a condition indicating that the lighting conditions in the luminaire's environment are below a predetermined threshold. Similarly, a suitable component of the luminaire (e.g., the luminaire's controller) can be configured to determine whether the battery is being charged. When the controller detects this "dusk" condition and detects that the battery is still being charged (e.g., by measuring the battery's state of charge, where changes in the state of charge can indicate an increase in battery voltage), this indicates that a grid charging unit (i.e., a charging unit connected to the mains electricity grid), and therefore an external current source, may be coupled to the battery to charge it. If, during this condition, a suitable component of the luminaire (e.g., the luminaire's controller) measures or detects load flicker, the load flicker can be corrected. This can be implemented, for example, in an output load control algorithm, where the load factor of the load can be adjusted. This can advantageously occur without any communication between the luminaire's controller and any external charge controller.

[0058] In the context of this disclosure, a controller may be considered a single integrated element, or may alternatively be considered a combination of several different elements such as a solar charge controller, load drivers, and various other electronic hardware components, which will be referred to below. Figure 2 Provide explanation.

[0059] In a second exemplary embodiment, a suitable component of the luminaire (e.g., a charge controller for the luminaire) can be configured to detect a so-called "dusk" condition, i.e., a condition indicating that the lighting conditions in the luminaire's environment are below a predetermined threshold. Similarly, a suitable component of the luminaire (e.g., the luminaire's controller) can be configured to determine whether the battery is being charged. When the controller detects this "dusk" condition and detects that the battery charge is neither increasing nor decreasing, the controller can be configured to detect whether an external mains charging unit, such as an AC-to-DC switch-mode power supply (SMPS), is connected. Once the controller detects the presence of such a mains charging unit (e.g., because the battery voltage is not decreasing), the controller can be configured to implement load flicker detection and correction.

[0060] In a third exemplary embodiment, a suitable element of the luminaire (e.g., the luminaire's controller) can be configured to detect so-called "twilight" conditions, i.e., conditions indicating that the lighting conditions in the luminaire's environment are above a predetermined threshold. Similarly, a suitable element of the luminaire (e.g., the luminaire's controller) can be configured to determine whether the battery is being charged with more power than is provided by the solar cell. When the controller detects this "twilight" condition and detects that the battery is being charged, and therefore detects the presence of a grid charging unit, the controller can adjust the battery's charging profile so that it draws maximum power from the grid and / or from the solar cell via the grid charging unit and is fully charged during "twilight" conditions (i.e., only during daylight hours). The benefit of charging the battery from the grid during daylight hours is that, once the battery is charged during the day, it can supply the luminaire's lighting load throughout the rest of the night without the need for an external grid charging unit. This approach can even help completely avoid the risk of load flicker by decoupling the luminaire's light output from the grid.

[0061] In a fourth exemplary embodiment, a suitable component of the luminaire (e.g., a charge controller for the luminaire) can be configured to detect a so-called "twilight" condition, i.e., a condition indicating that the lighting conditions in the luminaire's environment are below a predetermined threshold. Similarly, a suitable component of the luminaire (e.g., a controller for the luminaire) can be configured to determine whether the battery is being charged. When the controller detects this "twilight" condition and detects that the battery is being charged (e.g., by a grid charging unit, such as an external DC source), the controller can detect the presence of load flicker. If there is no load flicker, no correction may be necessary.

[0062] In a further developed embodiment, the luminaire may be configured to disable any new components, as these may have been sized according to grid conditions and may not be needed during normal DC load driving, as these may otherwise risk causing degradation in the performance of the light output driver of the light unit when operating on DC.

[0063] Figure 2 An embodiment of a luminaire 100 according to the present disclosure is schematically illustrated. Luminaire 100 may include or be coupled to a battery 101. A grid charging unit 102 may be present, coupled to battery 101. Grid charging unit 102 may be fed from a utility grid 107. Luminaire 100 may include or be coupled to a solar unit comprising at least one solar panel 103 and a solar charge controller 104 (which may form part of an overall controller for luminaire 100). Solar charge controller 104 may be coupled to at least one solar panel 103 and battery 101. Luminaire 100 may also include a load driver 105 configured to drive a load 106 (e.g., an LED or LED array), although any other suitable lighting technology may be used. Luminaire 100 may also include a controller 108 configured to discern a load current from load 106 and to feed a control signal back to load driver 105 to effect changes to load output settings.

[0064] Controller 108 may be implemented as a custom electronic hardware device in some embodiments, or as one or more off-the-shelf electronic units in other embodiments. Controller 104 and controller 108 may be considered a single integrated component, or alternatively may be considered a combination of several different components, and in some embodiments, may even include other components of the luminaire (such as load driver 105) if this is convenient.

Claims

1. A method (10) of operating a luminaire, the luminaire (100) comprising a battery (101) or being connectable to a battery (101), the battery being coupled to a mains power grid (107) via a grid charging unit (102), and the luminaire comprising a solar unit or being coupled to a solar unit; the method comprising: - detecting (15) whether a condition indicative of a lighting condition in an environment of the luminaire is below a predetermined threshold; - Determine if the battery is being charged; - if a condition indicative of a lighting condition below a predetermined threshold is detected, and if it is determined that the battery is being charged, detecting a load flicker (20) of the lighting, wherein the load flicker is attributable to a load ripple through the battery (101), wherein the load ripple is due to coupling of the battery to a grid charging unit; and - If load flicker of the luminaire is detected, correcting the load flicker (25) of the luminaire (100).

2. The method (10) according to the preceding claim, comprising maintaining the output state of the luminaire if no load flicker of the luminaire is detected or if it is determined that the battery is not being charged.

3. The method (10) according to any preceding claim, further comprising: - If no conditions are detected indicating that the lighting condition is below a predetermined threshold, and if it is determined that the battery is being charged, adjusting the charging profile of the battery of the luminaire so as to increase the power drawn from the grid charging unit (102).

4. The method (10) according to any preceding claim, wherein the condition indicative of a lighting condition being below a predetermined threshold is detected by detecting a lack of photovoltaic current reaching the battery from the solar unit (103).

5. A method (10) according to any preceding claim, wherein the condition indicative of a lighting condition being below a predetermined threshold is detected by consulting a predefined timetable and using a time-of-day clock.

6. A method (10) as claimed in any preceding claim, wherein the step of determining whether the battery is being charged is performed by measuring the state of charge of the battery to determine whether the battery voltage is increasing.

7. The method (10) according to any preceding claim, wherein the step of detecting a load flicker of the luminaire comprises detecting a load current ripple that deviates from a load current setting by more than 3.5 percent, preferably more than 5 percent.

8. The method (10) according to any preceding claim, wherein the predetermined threshold represents a demarcation between daytime with higher lighting conditions and nighttime with lower lighting conditions.

9. The method (10) according to any preceding claim, wherein the predetermined threshold value varies depending on the day and / or season.

10. A computer program comprising instructions which, when executed by a computer, cause the computer to perform the method (10) according to any preceding claim.

11. A computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to perform the method (10) according to any one of claims 1 to 9.

12. A computer device comprising a processor and a memory, the memory storing instructions which, when executed by the processor, cause the computer device to perform the method (10) according to any one of claims 1 to 9.

13. A luminaire (100) comprising a battery (101) or being connectable to a battery (101), the battery (101) being coupled to a mains grid (107) via a grid charging unit (102), and the luminaire (100) comprising a solar unit (103) or being coupled to a solar unit (103); wherein the luminaire (100) comprises a controller (104), the controller (104) being configured to cause the luminaire (100) to perform the method according to any one of claims 1 to 9.

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