Method for operating a luminaire with multiple light sources or groups of light sources

Abstract

Method for operating a luminaire (100) with several individually controllable units for light emission (110), wherein several external brightness setpoints are transmitted to the luminaire (100) and an internal brightness setpoint is determined for each controllable unit for light emission (110) on the basis of all external brightness setpoints taking into account associated weighting factors, characterized by that the external brightness setpoints of the luminaire (100) are transmitted using different operating addresses.

Description

[0001] The present invention relates to a method for operating a luminaire comprising multiple illuminants or groups of illuminants whose light output can be independently controlled. Furthermore, the present invention relates to a corresponding luminaire and a control unit for such a luminaire.

[0002] Luminaires are known from the state of the art which have several separate light emission units that can be controlled independently of one another. In the simplest case, these are luminaires which, on the one hand, have light sources for direct light emission and, on the other hand, have light sources for indirect light emission. The direct light emission can then be further divided into a highly directed component, which is used, for example, to illuminate workplaces or for the targeted illumination of objects, and a diffuse light component, which is used to create a larger-area but less intense additional or background lighting. Finally, luminaires which have individual so-called light modules, which, for example,are arranged in an elongated arrangement one behind the other or in a matrix, whereby the individual lighting modules can be individually adjusted in terms of their brightness and / or the color coordinate of the emitted light. A luminaire with several individually controllable lighting units is known, for example, from US 2010 / 0 277 340 A1.

[0003] With all these complex luminaires, the question arises as to how they can be conveniently controlled from a central control unit. Luminaires used in larger buildings or building complexes are typically integrated into large lighting systems, with the control of the luminaires being handled at least partially by a central control unit within the system. This central control unit typically transmits digital commands for brightness or color control to the individual luminaires.

[0004] In the context of digital lighting control, the so-called DALI (Digital Addressable Lighting Interface) standard has become particularly established in recent years. This is a communications standard for transmitting commands for lighting control, with which, in particular, brightness control values ​​can be transmitted to the luminaires connected to the system, which are then implemented accordingly by the luminaires. Within the DALI standard, each brightness command is assigned address information that specifies which system participant should implement the command sent from the central unit. In this case, the luminaires are usually assigned an individual operating address, and the luminaires can then be individually controlled based on this corresponding operating address.In addition, it is also possible to assign several lights to a group, which is controlled collectively within the framework of a corresponding group command and then behaves accordingly.

[0005] To ensure that, for example, each luminaire in a DALI system can be controlled individually, it is necessary for each luminaire to be assigned its own operating address. Therefore, it is known from the prior art that, for luminaires of the type described above, which have several independently controllable light emitting units, the luminaires can be assigned multiple DALI addresses, which are then used to control each individual unit.

[0006] This state-of-the-art approach has proven successful in the past, but it has the disadvantage that such luminaires then each occupy multiple DALI addresses. This is problematic because the DALI standard only specifies a limited number of addresses, meaning that an arbitrary number cannot be assigned. In the current version, a maximum of 64 operating addresses can be assigned within a DALI system, so the approach described above significantly reduces the number of luminaires that can actually be controlled. This problem becomes more pronounced the more complex the individual luminaires are designed, i.e. the more individually controllable lighting units the luminaires have.

[0007] Furthermore, it should be noted that the DALI standard is not necessarily designed for extensive, and especially fast, data communication. The strength of the DALI standard lies in its ability to adjust the brightness of luminaires using relatively short and simple commands. If it were now necessary to transmit a large number of DALI brightness commands to control a luminaire, this would significantly impair the efficiency of brightness control.

[0008] In this context, it is known from DE 600 23 730 T2 that, for programming lighting sequences, the starting and ending brightness values ​​for an arrangement of lighting units can be specified with just a few commands. Based on these few values, the system then determines brightness target values ​​for all lighting units, which are used by the lighting units to control the associated lamps within the lighting sequence.

[0009] The present invention is therefore based on the object of providing a novel solution for controlling more complex luminaires, in which the disadvantages described above are at least partially avoided.

[0010] The object is achieved by a method for operating a luminaire having the features of claim 1 and by a control unit for a luminaire according to claim 9. Advantageous developments of the invention are the subject of the dependent claims.

[0011] The inventive solution is based on the idea of ​​supplying a number of external brightness setpoints to the luminaire's control unit. The number of these externally supplied brightness setpoints, which then originate, for example, from the central control unit of the lighting system, is less than the number of individually controllable units of the luminaire. However, an internal brightness setpoint is determined for each controllable unit based on these externally supplied values. This is achieved by all external brightness setpoints contributing to the internal brightness setpoint, taking into account an individual weighting factor. The external brightness setpoints of the luminaire are each transmitted using different operating addresses.

[0012] According to the invention, a method for operating a luminaire with a plurality of individually controllable units for light emission is proposed, wherein a plurality of external brightness setpoints are transmitted to the luminaire and then an internal brightness setpoint is determined for each controllable unit of the luminaire on the basis of all external brightness setpoints taking into account associated weighting factors and wherein the external brightness setpoints of the luminaire are each transmitted using different operating addresses.

[0013] Furthermore, according to the invention, a control unit for a luminaire with a plurality of controllable units for the light output is proposed, wherein the control unit is designed to receive a plurality of external brightness setpoint values ​​and then to determine an internal brightness setpoint value for each unit of the luminaire on the basis of all external brightness setpoint values ​​taking into account associated weighting factors, and wherein the control unit is designed to receive the external brightness setpoint values ​​using different operating addresses.

[0014] The weighting factors mentioned above are crucial for the final internal brightness setpoint, i.e., the brightness value at which the corresponding light-emitting unit is actually operated. These are clearly summarized in a so-called weighting matrix, with the individual entries in the matrix establishing the relationship between an externally supplied brightness setpoint and a single controllable unit. This makes it possible to specifically influence the implementation of the externally supplied brightness setpoints by the luminaire's control unit.For example, the weighting matrix can be used to define a specific brightness profile which - in the case of several lighting units arranged one behind the other in an elongated arrangement - describes the brightness progression in the longitudinal direction, whereby the absolute brightness values ​​are determined by the external target values.

[0015] Conveniently, several corresponding weighting matrices are stored in the luminaire's control unit, which then define different light output profiles. The consumer or the system's central control unit can then select one of the matrices, which then determines the implementation of the externally supplied brightness target values. As already mentioned, for practical reasons, these are pre-stored weighting matrices, each corresponding to a specific lighting profile. However, it is also conceivable that special measures could influence the matrix entries, allowing the consumer to individually program the corresponding behavior of the luminaire.

[0016] According to an advantageous development of the concept described above, it can be provided that the end user has the option of setting the number of externally supplied brightness setpoints. This therefore specifies how many DALI addresses the luminaire should occupy, whereby the options for individual influence on the brightness output naturally increase the higher the number of DALI addresses used. A smaller number of DALI addresses, on the other hand, leads to a reduction in the options for influence, but the luminaire then also occupies fewer addresses, i.e. more luminaires can be connected to the DALI system. Furthermore, the number of DALI addresses used naturally affects the volume of data to be transmitted overall and thus the overall speed of the brightness control.Depending on the number of addresses used, an appropriate weighting matrix must then be selected.

[0017] Another refinement of the inventive concept involves the use of the so-called scene commands already provided for in the DALI standard. These are commands that do not directly contain brightness target values, but instead cause the luminaire to access pre-stored brightness values ​​stored in the luminaire's memory. In this case, more complex lighting settings for a luminaire do not have to be laboriously transmitted using numerous commands; instead, the luminaire can access pre-stored information.

[0018] The inventive concept can also provide for the use of such scene commands, which is desirable insofar as the luminaire should naturally function according to the DALI standard. In the present case, an addition can be made in that, when a corresponding scene command is transmitted, which in turn causes the luminaire to access pre-stored brightness setpoints, the corresponding weighting matrix is ​​also specified. In combination with the weighting matrix, this ensures that the pre-stored values ​​are correctly implemented to control the individual units.

[0019] Ultimately, this means that, according to the inventive concept, a luminaire can operate fully compatible with the DALI standard, while still allowing for the possibility of influencing a multitude of individually controllable light-emitting units with relatively little effort in terms of the data to be transmitted. This represents a significant advantage over the previously known solutions described above.

[0020] It should be noted that the inventive concept does not necessarily have to be implemented on the basis of the DALI standard, but that very clear advantages arise, particularly in this case.

[0021] The invention will be explained in more detail below with reference to the accompanying drawings. They show: Fig. 1 to 3 views of a luminaire in which the control concept according to the invention is to be used; Fig. 4 and Fig. 5 views of a lamp of the Fig. 1 to 3 lighting modules used; Fig. 6 schematically shows a DALI lighting system with a luminaire according to the invention; Fig. 7 schematically shows the procedure for calculating the internal brightness values ​​for the individual units; Fig. 8 an example of a weighting matrix; Fig. 9 an example of calculating the individual brightness values ​​according to the inventive concept and Fig. 10 to 12 different examples for variable lighting control of a luminaire according to the present invention.

[0022] Based on the Fig. 1 to 5, a luminaire will first be explained in which the inventive concept for controlling a plurality of lighting units is used in a particularly advantageous manner. Of course, the invention is by no means limited to the specific embodiment of a luminaire shown, but can be used whenever a luminaire has several separately controllable units for emitting light.

[0023] This is initially shown in the Fig. 1 and Fig. 2 shows two different views of a luminaire generally designated by reference numeral 100, which in the illustrated embodiment is designed as a pendant luminaire and is attached to a support element (not shown), for example, to the ceiling of a room, via at least one suspension element, in the present case via two cables 101. In the same way, however, the luminaire 100 could also be used as a ceiling-mounted luminaire.

[0024] As can be seen in the figures, the luminaire 100 is designed to be elongated overall. Its shape is primarily determined by a support element 102, which represents the central element of the luminaire 100 and to which all other components are arranged or attached. The support element 102 has, on its underside or the light-emitting side of the luminaire 100, a receiving area with an approximately U-shaped cross-section, in which several interchangeable lighting modules are arranged.

[0025] Two views of such a lighting module are shown in the Fig. 4 and Fig. 5, where Fig. 4 a perspective view of the lighting module from the top and Fig. 5 shows the underside through which the light is emitted. As can be seen, the lighting module 110 is approximately box-shaped and has on its rear side 111 - not shown in detail - means for mechanically fastening to the carrier element 102 as well as means for electrically contacting power supply and control lines. In particular, these contacting means are formed by a plug 112, which, when the module 110 is inserted into the receiving area of ​​the carrier element 102, is coupled to corresponding mating plug elements of the luminaire 100 and thus connected to a control unit of the luminaire 100. In the inserted state, the lighting module 110 is therefore not only mechanically fastened to the carrier element 102, but is also electrically connected to the control unit of the luminaire 100.This allows the control unit of the luminaire 100 to supply the module 110 with power and to control it individually, for example to adjust the brightness of the light output.

[0026] For the light emission, several LEDs (not shown in detail) are arranged within the module 110. These LEDs are arranged in a matrix-like manner, with the light emission occurring in two different ways in the illustrated embodiment. As can be seen from the view of the module 110 from below according to Fig. 5, several lenses 115 are arranged in a 3x6 matrix in the more central area. Each lens is assigned an LED, so that the corresponding light is then emitted via the assigned lens 115 in a directed manner towards the underside. This light emission thus achieves, for example, intensive and targeted illumination of a workplace or other object. In the peripheral area of ​​this LED lens matrix there is an additional frame-like area 116, which is also assigned LEDs. This frame area 116 is designed such that light emitted via it is emitted in a more diffuse manner. Ultimately, this means that the module 110 emits light in two different ways: on the one hand in the form of directed light emission via the lenses 115 and, on the other hand, diffusely via the surrounding frame 116.

[0027] As already mentioned, several such modules 110 are arranged in the receiving area of ​​the carrier element 102, so that a view of the lamp 100 is obtained from the underside, as shown in Fig. 3. It can therefore be seen that in the illustrated embodiment, a total of 14 lighting modules 110 are used, which are essentially identical in design, but can each be controlled individually. Strictly speaking, it would be conceivable that when controlling the individual modules 110, a distinction is again made between the light sources for directed light emission and the light sources for diffuse light emission. In this case, with regard to light emission towards the underside of the luminaire 100, there would be as many as 28 (14 x 2) LED groups or units whose light output can be adjusted independently of one another. To simplify the following explanations, however, it should initially be assumed that there is no separation between directed and diffuse light emission. Furthermore, anyAdditional light sources, such as those used for indirect light distribution toward the top, are not taken into account. In this simplified case, there are 14 units that need to be controlled individually.

[0028] As mentioned at the beginning, it has previously been common practice in such cases to assign an individual DALI operating address to each luminaire with multiple separately adjustable light units. In this case, such an approach would result in luminaire 100, even in the simplified version, which does not distinguish between directed and diffuse light emission and dispenses with indirect lighting, occupying 14 operating addresses of the DALI system. This not only means that a maximum of four such luminaires could be connected to a corresponding DALI system (since a maximum of 64 addresses are available), but also that extensive data transmission would be required to adjust the brightness of all modules.However, since communication according to the DALI standard is relatively slow, such an approach would obviously not be practical for the luminaire shown here.

[0029] According to the invention, a completely new concept for controlling the luminaire, or more precisely the individual lighting modules, is therefore proposed, which will be explained in more detail below.

[0030] The problem underlying the invention is schematically shown again in Fig. 6. Shown here is a DALI system 50, which has a central control unit 51, from which the system's bus line 52 extends. Connected to this bus line 52, among other things, is the luminaire 100, which internally has a control unit 120 provided for communication with the central control unit 51. DALI commands issued by the control unit 51 are thus received and implemented by the internal control unit 120 of the luminaire 100, such that the modules 110 are operated at the desired brightness.

[0031] The manner in which the control unit 120 causes the individual modules 110 to assume the ultimately desired brightness plays a rather subordinate role for the present invention. For example, it could be provided that each module 110 is individually supplied by the control unit 120 with a correspondingly designed current. However, it would also be conceivable for the control unit 120 to merely issue internal brightness commands to the modules 110, which then in turn independently assume the corresponding brightness. In all variants, however, it is necessary that brightness target values ​​are determined for each individual module 110 within the luminaire 100 or the control unit 120, which are referred to below as internal brightness target values. The invention relates to the task of providing or determining these internal brightness target values ​​in the simplest and most efficient manner possible.

[0032] The solution according to the invention is based on the idea of ​​transmitting only a small number of external brightness setpoints through the central control unit 51 of the DALI system 50, but then generating individual internal brightness setpoints for all individual units 110 from these few external brightness setpoints. This procedure is schematically shown in Fig. 7. Several DALI brightness setpoints (DALI control values), in this case, four brightness values, are thus supplied externally to the luminaire's control unit 120 using different operating addresses. However, the control unit 120 then generates an individual internal brightness setpoint (control value module 1, control value module 2, etc.) for each lighting module 110 from these four external brightness values ​​and then transmits this to the corresponding lighting module 110 or controls it accordingly.

[0033] The special feature of the inventive procedure is that, in principle, for each individual internal brightness setpoint output to one of the lighting modules 110, all externally supplied DALI brightness control values ​​are taken into account. This is achieved via weighting factors, each of which establishes a relationship between the external values ​​and the lighting module to be controlled. These weighting values ​​can be summarized in a matrix, as shown, for example, in Fig. 8 is shown.

[0034] As can be seen, the matrix contains a certain number of rows, which corresponds to the number of externally supplied brightness setpoints. For the above case, in which four DALI values ​​are supplied, the matrix would initially contain four rows, each corresponding to a DALI address used by the luminaire 100. Furthermore, columns are provided, with each column corresponding to a lighting module to be controlled. In the present embodiment, this means that the matrix, as shown, contains 14 columns, although the meaning between the rows and columns could obviously also be interchanged. The matrix entry m i,jA specific combination of column i and row j defines the extent to which the external brightness setpoint corresponding to the row influences the light output of the lighting module associated with the column. These are, for example, percentage values ​​that weight the corresponding external brightness setpoint.

[0035] In mathematical terms, this results in an internally calculated brightness setpoint S i for a specific lighting module with the number i the following relationship: Si=1100∑j=1jmaxmij⋅dj where m ij as already mentioned corresponds to the weighting factor of the i-th column and the j-th row of the weighting matrix and d j represents the DALI brightness setpoint of the jth address. Ultimately, the external brightness setpoints weighted with the matrix weighting values ​​are summed to the internal setpoint and standardized if necessary. A calculation example for this is shown in Fig. 9, where the matrix is ​​now designed for eight external brightness setpoints and, based on these, 32 internal brightness setpoints to be calculated.

[0036] Accordingly, the matrix entries within a column should always add up to 100, provided the weighting values ​​are specified as a percentage. However, since the matrix is ​​stored digitally, it is also possible to assign weighting values ​​between 0 and 200 to optimize memory utilization. Accordingly, the final value of the sum must then be divided by 200 instead of 100. The weighted sum must therefore be standardized accordingly, depending on the range of the weighting values.

[0037] Using the previously described procedure and the weighting matrix, a large number of internal brightness setpoints for controlling the individual lighting modules can be calculated from a relatively small number of externally supplied DALI brightness setpoints. The entries in the weighting matrix primarily specify certain patterns regarding the brightness progression along the luminaire. It is important to note that with this procedure, the light output of the luminaire is still primarily determined by the brightness setpoints transmitted by the system's central control unit. Thus, it is still possible to easily influence the light output of the luminaire externally.

[0038] This is illustrated by the following examples, the Fig. 10 to 12, in each of which it is assumed that only six lighting modules are used, which are to be controlled using two external brightness setpoints (DALI 1 and DALI 2).

[0039] In the example of Fig. 10 is taken from the Fig. 10a. If the two external brightness setpoints are as follows: DALI 1 = 100; DALI 2 = 0, the brightness curve across the six lighting modules is as shown in Fig. 10b. However, if the external brightness values ​​are swapped (DALI 1 = 0; DALI 2 = 100), the lighting scenario according to Fig. 10c. If both external brightness setpoints contain the maximum value of 100, the lighting is finally calculated according to Fig. 10d. The weighting matrix used in this example therefore ensures a more linear brightness gradient between the modules.

[0040] Fig. 11 shows another example, which is derived from the matrix according to Fig. 11a. External brightness setpoints DALI 1 = 100 and DALI 2 = 0 now produce the appearance according to Fig. 11b, while the light output according to Fig. 11c with external brightness setpoints DALI 1 = 50 and DALI 2 = 100. The weighting matrix according to Fig. 11a therefore achieves a more gradual brightness transition in the longitudinal direction of the luminaire.

[0041] Finally, the example of the Fig. 12, where the weighting matrix is Fig. 12a, it is possible to achieve significantly different illumination patterns with the appropriate matrix. Thus, the light output is Fig. 12b in the example shown with the external brightness setpoints DALI 1 = 100 and DALI 2 = 25.

[0042] The matrix entries therefore primarily influence the brightness distribution between the adjacent light modules of the luminaire, so that the possibilities for individual control of the modules are only slightly impaired despite significantly lower data transmission costs. Thus, the solution according to the invention offers the possibility of a luminaire as in the Fig. 1 to 5, in a simple but efficient way.

[0043] It should be noted that—as shown in the examples—individual weighting values ​​in the matrix can also assume the value 0, so that in this case, the corresponding external brightness setpoint makes no contribution to the internal brightness setpoint. However, the calculation of an internal brightness setpoint is always based on all external brightness setpoints, since the control unit obviously does not check in advance whether one of the matrix entries is equal to 0 or not.

[0044] During operation, the luminaire or its internal control unit accesses a single weighting matrix. Preferably, however, several weighting matrices are stored in a memory within the luminaire's control unit, which can be selectively accessed and, if necessary, modified. Preferably, some basic principles of the brightness progression (step-like progression, linear progression, or similar) are stored as unmodified matrices so that they are always available when needed. Additional, possibly individually configurable matrices can then be available, which can be programmed by the consumer as required. The selection and / or programming of a matrix can be done using special commands of the DALI standard, which provide the option of accessing the memory area of ​​the control unit.

[0045] In addition, individual control of the units can also be carried out in a special mode. First, a so-called base matrix is ​​selected from the pre-stored matrices, in which the weighting values ​​are such that a subset of the units is controlled individually by the external brightness setpoints. This matrix then contains a maximum of one entry other than 0 (usually 100) in each row (which corresponds to a DALI address). After transmitting the external brightness setpoints and setting the brightness of the lighting units, the matrix is ​​then modified so that additional units can now be controlled individually. This process is repeated until each unit has assumed an individual brightness.A special feature of this individual control is that only those units for which the weighting matrix contains an entry other than 0 actually receive an internal brightness setpoint, since otherwise all other units would always be switched off.

[0046] In the above examples, as already mentioned, it was assumed that the individual lighting modules of the luminaire do not differentiate between directed and diffuse light emission, i.e., there are a total of 14 individually controlled lighting units. Accordingly, the weighting matrix according to Fig. 8 also has 14 columns, as mentioned above. Obviously, however, the inventive principle can also be easily extended to the case where a distinction is to be made between directed and diffuse light emission. In this case, the matrix must then be expanded to a total of 28 columns, with two columns belonging to each module, one column relating to directed light emission and the other column to diffuse light emission. Furthermore, an additional column could also be provided for calculating a brightness target value for indirect light emission.

[0047] Another extension of the inventive principle would be conceivable if the light sources of a module were formed by separately controllable RGB modules, i.e., if a mixed light of any desired hue or color temperature were to be generated by separately adjusting the three primary colors red, green, and blue. Again, instead of a single column with corresponding weighting entries in the matrix, multiplication would have to be performed. The matrix must therefore always contain as many columns as the number of separately controllable light sources or groups of light sources to be used. The term "lighting unit" refers to such an individually controllable light source group or an individually controllable light source.

[0048] As already mentioned at the beginning, the DALI standard also supports so-called scene commands, which do not transmit brightness values ​​but instead instruct the receiving units to retrieve pre-stored brightness values. This can also be done in the same way with the inventive concept, whereby it is preferably provided that, at least for certain scenes, the information regarding which associated weighting matrix should be selected is also stored. Only the correct interaction between the pre-stored DALI brightness values, which – in the sense of the DALI standard – define the scene, and the associated weighting matrix ensures that the desired brightness pattern is actually achieved.

[0049] Another development of the inventive concept can be that the end user can select how many DALI addresses are to be occupied by the luminaire. In the above example according to Fig.9 it was assumed that the luminaire could occupy up to eight DALI addresses, with the help of which up to 32 units could be controlled. However, it may be desirable for the luminaire to use fewer DALI addresses. In this case, a corresponding matrix must be selected which uses fewer rows. For practical reasons, however, matrices of the same size are always stored in the memory of the control unit, whereby if the number of DALI addresses used is reduced, only the corresponding rows are used. This means that if the consumer decides to use only four DALI addresses, only the first four rows of the associated weighting matrix will actually contain entries, the four further rows contain only zeros.This further increases flexibility, as the consumer can individually select how many addresses should actually be used by the luminaire, depending on the number of addresses available in the system.

[0050] In this context, it should be noted that the invention provides for the externally supplied brightness setpoints to be transmitted individually using different operating addresses. This is actually the simplest approach to implement. In a variant not covered by the claims, it would also be conceivable for the external values ​​to be transmitted one after the other under the same DALI address, and for the control unit to initially buffer them. Only after the complete package, i.e. all external brightness setpoints, have been received and saved, can the internal brightness setpoints for the units to be controlled be calculated in the manner described above. In this case, the number of addresses to be occupied by the luminaire can be further reduced – in extreme cases, to one address.

[0051] It should also be taken into account that the transmission of new external brightness setpoints can result in significant changes in the light output of the luminaire. To avoid changes that occur too quickly, it can be provided that an internally resulting control value difference between the previous setpoint and a newly calculated setpoint is realized in several - e.g. 8 - individual steps over a period of approximately 250ms. If the target value changes during this transition (due to the receipt of another external control value), the process is restarted, i.e. the last output value is the start value and the difference to the target value is again output in 8 individual steps. This can apply, for example, in the case that the internal setpoints are calculated immediately after receipt of an external setpoint. However, it would also be conceivable for the calculation to only take place after all external setpoints have been received.In this case, the entire matrix is ​​reloaded, and an even slower transition is attempted to reliably avoid effects caused by slower DALI value transmissions, which could result in brief flashes. In this case, the target value is controlled in 32 individual steps, for example, and the complete transition takes approximately 1 second. If the target value changes again during this time, the process can be restarted, with the last output value becoming the new starting value.

[0052] Ultimately, the solution according to the invention leads to a significant improvement in the control of more complex luminaires. It should be noted that communication between the central control unit and the luminaire does not necessarily have to follow the DALI standard; other communication standards could also be used. Nevertheless, use in a DALI system represents a particularly preferred embodiment of the invention, as the described advantages are particularly evident here.

Claims

[1] Method for operating a luminaire (100) with a plurality of individually controllable units for emitting light (110), wherein a plurality of external brightness setpoints are transmitted to the luminaire (100) and an internal brightness setpoint is determined for each controllable light emitting unit (110) on the basis of all external brightness setpoints, taking into account associated weighting factors, characterized by , that the external brightness setpoints of the luminaire (100) are each transmitted using different operating addresses. [2] Method according to claim 1, characterized by that to determine an internal brightness setpoint, each external brightness setpoint is weighted by a weighting factor (m ij ) and the internal brightness setpoint represents the sum of the weighted external brightness setpoints. [3] Method according to claim 2, characterized bythat the weighting factors are summarized in the form of a weighting matrix and are stored in the luminaire (100), preferably in a control unit (120) of the luminaire (100). [4] Method according to claim 3, characterized by that several weighting matrices are stored in the luminaire (100) which can be selected by a user. [5] Method according to claim 4, characterized by that at least one of the weighting matrices can be changed by the user. [6] Method according to claim 4 or 5, characterized by that the user can select on the basis of how many external brightness setpoints the internal brightness setpoints are calculated, whereby a corresponding weighting matrix is ​​selected depending on this. [7] Method according to one of the preceding claims, characterized by that the external brightness setpoints are transmitted via DALI commands. [8] Method according to claim 7, characterized bythat when a DALI scene command is transmitted, weighting factors corresponding to the selected scene are selected at the same time. [9] Control unit (120) for a luminaire, which has several individually controllable units for light emission (110), wherein the control unit (120) is designed to receive a plurality of external brightness setpoints and to determine an internal brightness setpoint for each controllable light emitting unit (110) on the basis of all external brightness setpoints, taking into account associated weighting factors, characterized by , that the control unit (120) is designed to receive the external brightness setpoints using different operating addresses. [10] Control unit according to claim 9, characterized bythat the control unit (120) is designed to determine an internal brightness setpoint by comparing each external brightness setpoint with a weighting factor (m ij ) and then calculate the sum of the weighted external brightness setpoints. [11] Control unit according to claim 10, characterized by that the weighting factors are summarized in the form of a weighting matrix and are stored in the luminaire (100), preferably in a memory of the control unit (120). [12] Control unit according to claim 11, characterized by that several weighting matrices are stored, which can be selected by a user. [13] Control unit according to claim 12, characterized by that at least one of the weighting matrices can be changed by the user. [14] Control unit according to claim 12 or 13, characterized bythat several weighting matrices are stored, which correspond to different numbers of external brightness setpoints. [15] Control unit according to one of claims 9 to 14, characterized by that the control unit (120) is designed to receive the external brightness setpoints in the form of DALI commands. [16] Control unit according to claim 15, characterized by that the control unit (120) is designed to use weighting factors corresponding to the selected scene simultaneously upon receipt of a DALI scene command. [17] Luminaire comprising a plurality of individually controllable units for light emission (110), as well as a control unit for determining desired brightness values ​​for the units (110) according to one of claims 9 to 16. [18] Lighting system (50) with a central control unit (50) and at least one luminaire (100) according to claim 17.

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