DE102012213046B4 - Luminaire for mixing light colours, in particular WW and TW light from LED elements, as well as circuit board and LED module for this purpose - Google Patents

Abstract

Luminaire for mixing light colors, namely warm white (ww) and daylight white (tw) light from LED elements, comprising:a first circuit board (401; 621) with a plurality of first light sources (111) for generating light with a first light color, in particular with LED elements, wherein the light sources are arranged according to a predetermined assembly grid of the first circuit board; anda second circuit board (402; 622) with a plurality of second light sources (112) for generating light with a second light color, in particular with LED elements, wherein the light sources are arranged according to a predetermined assembly grid of the second circuit board;wherein one of the first and second light colors is a warm white (ww) light color and the other of the first and second light colors is a daylight white (tw) light color;characterized in thatat least the first circuit board (401; 621) has recesses (406; 626) which are provided according to the assembly grid of the second circuit board (402; 622) and in the area of which one or more second light sources (112) of the second circuit board are positioned in order to enable a mixture of both light colors, wherein the assembly grids of the first and second circuit boards (401, 402; 621, 622) are regular and congruent and the first and second light sources (111, 112) are arranged regularly alternating in at least one direction, wherein at least the first circuit board (401; 621) has through holes (406; 626) as recesses congruent with the component grid of the second circuit board, wherein the second circuit board (402; 622) is arranged behind the first circuit board (401; 621) and with at least some of the second light sources (112) aligned with the through holes (406; 626) in order to enable a mixture of both light colors.

Description

The invention relates generally to a lamp for adjustable mixing of two different light colors and in particular to a lamp for adjustable mixing of light in warm white (ww) light color and in daylight white (tw) light color, which is generated by two different LED types. The invention also relates to a circuit board or printed circuit board that is especially suitable for this purpose.

Lights, especially LED lights, are typically offered with a predetermined light color, e.g. with a light color in the range of around 3300 to 5300K (nw: neutral white), over 5300K (tw: daylight white) or under 3300K (ww: warm white). Modern lights are often also dimmable. In addition to the light intensity setting in the area of LED lighting, it is also known to provide a white-white (wsws) control, e.g. to mix neutral white and warm white with each other in an adjustable way. This approach also enables an adjustable light color or color temperature that better replicates the course of daylight and is thus optimally adapted to the human biorhythm. An LED light with such a light control, called circadian, is already offered by TRILUX GmbH & Co. KG under the name "Acuro Active".

However, solid-state light sources, especially LEDs, usually produce almost monochromatic light in a very narrow wavelength range, i.e. the light color is fixed and cannot be changed, for example by the semiconductor used. Therefore, in order to optionally adjust the light color or color temperature produced, it is necessary to mix light from at least two different colored light sources. For example, with warm white (ww) and daylight white (tw) light from corresponding LED types, a daylight-like, circadian progression (warm-cool/neutral-warm) can be achieved by proportionally dimming or dosing the respective light emission.

However, in the manufacture of suitable lights, particularly the LED modules to be used, the requirement for different types of light sources means a significant additional effort. It would be possible, for example, to arrange known strip-like circuit boards, each equipped with the corresponding LED type, in alternating colors to achieve a color mixture. Another approach would be to equip a circuit board with two different types of light sources. However, this requires more complex assembly machines that can equip a circuit board with two different types of light sources. Both approaches entail additional effort, either due to more complex assembly and wiring of many smaller circuit boards, or higher costs in the assembly process. EN 20 2010 008 480 U1 discloses an LED module comprising circuit boards equipped with different light sources and arranged next to each other. WO 2008/002073 A1 discloses an LED module that has several circuit boards, each equipped with different light sources that are arranged next to each other in an optimized manner with a variety of geometries. EP 1 930 947 A1 reveals an LED module in which identically equipped circuit boards interlock with each other at their edges to brighten their transition area. US 2010/0110659 A1 discloses an LED module in which identically designed LEDs are arranged at different depths, wherein a fluorescent material of different thickness is provided above the LEDs according to the depth of their arrangement in order to influence the light color emitted by the LED module.

One object of the present invention is therefore to propose a solution for mixing light colors which simplifies production and reduces production costs. This object is achieved by a lamp with the features of claim 1 and also by a circuit board with the features of claim 7.

A generic lamp for adjustable mixing of light colors, in particular LED light, comprises a first circuit board which is provided with a plurality of light sources of a first type according to a predetermined grid, in particular is equipped with LED elements of a first type. These generate light with a first light color. The generic lamp also comprises a second circuit board which is also equipped with a plurality of light sources of a second type according to a predetermined, preferably identical grid. Similarly, the second circuit board can be equipped in particular with LED elements of a second type. These generate light with a second light color which is different from the first light color and is suitable for the desired mixture.

According to the invention, a simplification in terms of production technology is achieved, and the mixture of both light colors enables recesses to be provided in at least the first circuit board or in both circuit boards, corresponding to the grid of the second circuit board, and in the area of the recesses in the first circuit board, one or more second light sources, e.g. LED elements, of the second circuit board are positioned. In this case, all or only some of the second light sources, individually or in groups, can be positioned in the area of corresponding assigned recesses in the first board.

The term recess is to be understood in the broadest sense here and includes any type of translucent, typically material-free area in the first circuit board. Material-removing or machining the circuit board is suitable for creating the recesses, but is not absolutely necessary. The position or area specification of the second light source(s) in relation to the associated recess is also to be understood broadly. This includes any arrangement in which light from a light source of the second type can radiate into the same spatial area as the light from the light sources on the first circuit board, for example from within a recess or through it.

Due to the design according to the invention, all circuit boards can be manufactured in a larger format and each with a large number of identical light sources. Two such circuit boards, each with different types of light source, can then be assembled to form a mixable module, for example an LED module.

In particular, an identical circuit board layout is preferably used for both the first and the second circuit board. The corresponding circuit board can also be used for lights without light mixing, in line with a platform strategy. Due to the design according to the invention, the costs of the circuit board are reduced through higher quantities. Standardization also reduces storage and logistics costs. Furthermore, a single assembly machine can produce all the required variants with a single setting. Only the lamps used need to be changed accordingly during assembly. Accordingly, the modular circuit board layout also simplifies the changeover to a new generation of light sources, e.g. a new LED generation.

In an embodiment not claimed, both the first and the second circuit boards each have, similar to a rake, tooth-like lateral recesses on one side, between which there are tongues that are equipped with light sources. In the assembled module, the tongues and recesses interlock so that light sources of the first light color on the first circuit board and light sources of the second light color on the second circuit board are arranged alternately and with overlapping radiation or directional characteristics in order to achieve the mixture of both light colors. In the unpopulated state, the first and the second circuit boards are preferably identical for standardization so that only one type of circuit board is required.

In the above-mentioned design, it is advisable to ensure the most homogeneous light mixing possible if the centre distance between two tongues is identical to the centre distance between the adjacent recesses. Preferably, all tongues and recesses are regular and complementary in plan. However, if the directional characteristics differ between the two types, irregular distances can also be useful.

According to the invention, at least the first circuit board has through holes as recesses, which are provided so as to coincide with the component grid of the second circuit board. In this case, the second circuit board is arranged behind the first circuit board, viewed against the direction of radiation, in such a way that at least some of the light sources with the second light color are aligned with the through holes or the radiation occurs at least largely through the through holes. Even without arranging the light sources of both light colors in the same plane, a mixture is thus made possible by overlapping directional characteristics. The effort required to shape or process the circuit boards can be reduced in this way. In addition, the production of the holes is basically only actually necessary in the front circuit board. On the other hand, the rake-like design described at the beginning with interlocking tongues and recesses is suitable for easier assembly and allows higher specific heat losses, i.e. higher light intensity and illuminant density.

In both variants, an identical basic type is preferably used as a circuit board for both the light sources of the first and the second type.

In the design with holes, it is advantageous if at least in the first board, alternating rows of light sources and holes are provided. Here too, it is expedient to use a single board layout for both types of light source if the center distance between two rows of light sources is identical to the center distance of the adjacent rows of holes. Preferably, in order to produce a homogeneous light mixture with an almost identical directional characteristic of both types of light source, the drilling template and the assembly grid of the light sources are designed according to a regular pattern and at least largely congruent. By providing an assembly grid that is regular and congruent on the first and second boards, In the composite module, the first and second light sources are arranged regularly and alternately in at least one direction, so that the most homogeneous light mixture possible is achieved.

For effective light mixing and cost reduction, it is advantageous to equip each board with the same surface density and preferably with a plurality of at least 16 LED elements of the same type. In particular, LEDs can be used with a light color of either less than 3300K or more than 5300K to implement a wsws control.

For automatic circadian light control, the luminaire can comprise at least one operating device, preferably two operating devices, for supplying the first and second light sources independently of one another in a dimmable manner. If necessary, a control can be integrated into the luminaire for automatically controlling the respective light sources on each circuit board. In particular, a control can be provided for mixing both light colors according to a pre-programmed time course, in particular a circadian or daylight-like course. Alternatively, the dimmable operating device(s) can be designed to be controllable from outside, for example via DALI, for dimming the first independently dimmable light source and the second light source independently of one another.

The invention also relates to the circuit board itself, which is suitable for a lamp for mixing light colors, in particular warm white (ww) and daylight white (tw) light from LED elements. The circuit board is equipped in a known manner with a plurality of light sources according to a predetermined grid for generating light with a first light color, in particular with LED elements.

According to the invention, the circuit board has recesses which are provided in accordance with the placement grid of the light sources. As a result, by adding another, identical circuit board in the area of each recess, one or more light sources, in particular LED elements, can be positioned and the advantages mentioned at the beginning are achieved.

The invention further relates to an LED module for mixing light colors. According to the invention, this is characterized by a first circuit board with a plurality of light sources of a first light color, and a second circuit board with a plurality of light sources of a second light color, wherein at least the first circuit board has recesses in the area of which one or more light sources of the second light color are positioned.

In principle, despite the preferred design with two identical circuit boards or printed circuit boards in each module, a design with complementary but differently designed circuit boards is not excluded. Furthermore, designs with more than two complementary circuit boards combined to form a module are also conceivable, such as three stacked circuit boards with RGB components to produce any desired color gradient. Furthermore, the invention is not limited to applications with LEDs as lighting sources, but is suitable for any type of lighting source with an approximately single-color light emission spectrum.

The proposed design and construction of the circuit boards and modules is particularly suitable for interior lighting, especially for a ceiling light that has a flat light exit opening in the light housing for several, for example four, tile-like modules that are mounted next to each other, for example on a mounting body. To support light mixing and more even radiation, a translucent or opal cover can be provided in front of the modules or in the light exit opening.

• 1: eine erste und eine zweite Platine in schematischer Draufsicht einer nicht beanspruchten Ausführung, bei Zusammenbau;
• 2A: ein aus Platinen nach 1 zusammengesetztes LED-Modul in schematischer Draufsicht;
• 2B: das LED-Modul aus 2A im schematischen Querschnitt gemäß Schnittlinie IIB-IIB;
• 3: ein erstes Ausführungsbeispiel einer nicht beanspruchten Leuchte mit mehreren Modulen gemäß 2A-2B, in schematischer Frontansicht;
• 4A: eine Ausführung eines erfindungsgemäßen LED-Moduls aus zwei Platinen, in schematischer Draufsicht;
• 4B: das LED-Modul aus 4A im schematischen Querschnitt gemäß Schnittlinie IVB-IVB;
• 5: ein Ausführungsbeispiel einer erfindungsgemäßen Leuchte mit mehreren Modulen gemäß 4A-4B, in schematischer Frontansicht;
• 5: ein Ausführungsbeispiel einer erfindungsgemäßen Leuchte in schematischer Frontansicht, mit mehreren LED-Modulen gemäß einer weiteren Ausführung; sowie
• 7: ein Schaltschema einer Leuchte mit zwei Betriebsgeräten zum Betrieb mehrerer LED-Module.

Further advantages and features of the invention will become apparent from the following description of preferred embodiments with reference to the drawings.

• 1 : a first and a second circuit board in a schematic plan view of a non-claimed embodiment, during assembly;
• 2A : a made of circuit boards 1 assembled LED module in schematic top view;
• 2 B : the LED module from 2A in schematic cross-section according to section line IIB-IIB;
• 3 : a first embodiment of a non-claimed luminaire with several modules according to 2A-2B , in schematic front view;
• 4A : an embodiment of an LED module according to the invention comprising two circuit boards, in a schematic plan view;
• 4B : the LED module from 4A in schematic cross-section according to section line IVB-IVB;
• 5 : an embodiment of a luminaire according to the invention with several modules according to 4A-4B , in schematic front view;
• 5 : an embodiment of a luminaire according to the invention in a schematic front view, with several LED modules according to a further embodiment; and
• 7 : a circuit diagram of a luminaire with two control gears for operating several LED modules.

1 shows a first board 101 and a second board 102, each with an identical, rake-shaped or crenellated plan. The plan of the two boards 101, 102 is designed with E-like areas, with tongues 104 and recesses 106 alternating. The recesses 106 are provided with a substantially rectangular outline perpendicular to one side of the respective board 101, 102. Accordingly, the tongues 104 remaining between the recesses 106 are substantially rectangular and extend parallel in strips and protrude perpendicularly from the web which carries the tongues 104. As can be seen from 1 As can be seen, the tongues 104 and recesses 106 are designed complementarily and can interlock like a toothing.

A plurality of LED lighting elements with the same radiation direction are provided on each of the two circuit boards 101, 102. Only LED lighting elements 111 of a first type, for example ww-LED, are arranged on the first circuit board 101. Only LED lighting elements 112 of a second type, for example tw-LED, are arranged on the second circuit board 102. As in 1 However, the LED lighting elements 111, 112 are shown each provided according to an identical assembly pattern on the identically designed circuit boards 101, 102. The LED lighting elements 111, 112 are in particular arranged in parallel rows. The vast majority of the LED lighting elements 111, 112 are located in the area of the tongues 104. However, some LED lighting elements 111, 112 can also be provided in the remaining area in order to utilize the circuit board surface.

Due to the regular assembly grid of the LED lighting elements 111, 112, the assembled state results in 2A a periodic, uniform pattern of LED lighting elements 111, 112. In particular, the peg-like engagement of the tongues 104 in the recesses 106 creates a regular pattern in which rows of LED lighting elements 111 of the first type alternate with LED lighting elements 112 of the second type.

How best to 2 B As can be seen, the alternating LED lighting elements 111, 112 in the example according to 1-2 arranged next to each other in the same plane with identical radiation direction. The assembly grid according to 2A is also periodic in the direction of both main axes of the circuit boards 101, 102 with the same grid dimension, so that a mixing of the two types of lighting elements 111, 112 that appears as homogeneous as possible is achieved.

2A also shows the center distance D1 between two tongues 104, measured in the direction perpendicular to the row axis of the first light elements 111 or to the main axis of the tongues 104 (or the left-right direction in 2A) . For each board 101, 102, this is identical to the center distance D2 between two recesses 106 and is also regularly selected and corresponds to twice the grid spacing in the example shown. Larger integer multiples of the grid spacing are also possible, ie, for example, two rows per tongue 104 and/or per recess 106. Accordingly, in the example according to 2A On each circuit board 101, 102, the LED lighting elements 111, 112 are arranged at a distance D1 and D2, respectively.

The two assembled circuit boards 101, 102 with alternating light sources 111, 112 of different light colors or color temperatures form in the example according to 2A-2B an approximately square, tile-like LED module 120 that is suitable for mixing the two color temperatures. In the embodiment shown, a relatively low surface density of the light sources 111, 112 is selected in order to reduce the requirements for heat dissipation. Conventional non-thermal materials can be used for the circuit boards 101, 102. However, the use of high-performance LEDs and/or a higher surface or power density is not excluded. In these cases, thermal boards, in particular IMS or metal core boards, can be used as circuit boards 101, 102.

3 shows a schematic front view of a lamp 300 with a lamp housing 301 and with an open light exit opening, ie without a typically attached cover, eg an opal cover. In the lamp housing 301, within the light exit opening on a mounting body 303, four tile-like modules 120 according to 2A-2B mounted next to each other in the same plane, screwed to the mounting body 303 so that it can be replaced for later maintenance.

4A-4B show an alternative design of suitable circuit boards 401, 402 and an LED module 420 composed thereof. As can be seen from the cross section in 4B As can be seen, through holes 406 are provided in the first board 401 as recesses. The through holes 406 are provided in the first board 401 so as to be congruent with the identical assembly grid of the first and second boards 401, 402, but offset laterally by half the center distance D1. Accordingly, the holes 406 are located centrally between the rows of first LED lighting elements 111 in the first circuit board 401. Accordingly, the center distance D2 between the parallel rows of through-holes 406 is also identical to the center distance D1 between the parallel rows of LED lighting elements 111.

Furthermore, 4B , how the second board 402 is mounted behind the first board 401 in such a way that part of the second light sources 112 are arranged in alignment with the through holes 406. Accordingly, the directional characteristics of the first and second LED lighting elements 111, 112 overlap or overlap in order to enable a mixture of both light colors, e.g. warm white and daylight white. For optimal use of the board surface, rows of LED lighting elements 111, 112 are provided on the outside and parallel rows of through holes 406 in the middle between them. In this way, the outer row of LED lighting elements 112 (left in 4A-4B) No through holes 406 are required on the lower, second board 402. These outer LED lighting elements 112 can protrude laterally offset from the first board 401.

The second board 402 can be attached to the back of the first board 401 or can be detachably attached to the carrier together with the first board 401. As shown in 4B shown, it can be stacked in the stacked arrangement according to 4A-4B It may be advisable to place an electrically insulating layer 407 between the two circuit boards 401, 402 to avoid short circuits. The second circuit board 402 can be 4B , apart from the fitting with LED lighting elements 112 of different light colors, be designed to be completely identical to the first circuit board 401 for standardization. The second circuit board 402 can in particular also have through holes 406. However, through holes 406 are not required in the second circuit board 402.

5 shows a schematic front view of a second lamp 500 with a lamp housing 501. The lamp differs from the one according to 3 only by using LED modules 420 according to 4A-4B , so reference is made to the corresponding description above.

6 shows in open front view a third variant of a lamp 600 with a lamp housing 601 for LED modules 620. This lamp 600 differs from the previous examples by the use of LED modules 620 according to an additional design variant. The LED modules 620 also have two circuit boards 621, 622 with through holes 626 as recesses. The circuit boards 621, 622 are analogous to 4B stacked on top of each other on the mounting body 603. In contrast to 4A-4B in the circuit boards 621, 622, the rows with the LED lighting elements 111 of the first light color are offset from the parallel rows with the LED lighting elements 112 of the second light color, also in the parallel direction of the rows by approximately half the grid dimension, ie D1/2 or D2/2. Accordingly, the lower circuit board 622 also protrudes from the front circuit board 621 on two sides, as shown in 6 The first and second LED lighting elements 111, 112 also alternate in the direction of the diagonal. With such a checkerboard-like alternating arrangement, a further improvement or a less direction-dependent light mixture can be achieved. Furthermore, with checkerboard-like alternating first and second LED lighting elements 111, 112, the need for through holes 626 can be reduced and, if desired, a higher surface density can be achieved. The circuit boards 621, 622 according to 6 have a periodic assembly pattern with the same grid size in both directions for the most homogeneous mixing possible. The drilling template for the through holes 626 is also identically regular in both directions and in 6 chosen offset in two directions.

Lights after 3 , after 5 and after 6 In particular, they enable the simulation of the change in natural light over the course of the day by mixing the warm white (ww) light, e.g. at about 3000K, from first LED lighting elements 111 with daylight white (tw) light, e.g. at about 6500K, from second LED lighting elements 112.

In 7 For this purpose, an electrical circuit diagram of a lamp 300 is shown purely as an example and in a simplified manner. A first LED operating device 731 and a second LED operating device 732 are provided for supplying the first and second LED lighting elements 111, 112 with power that can be dimmed independently of one another.

The two operating devices 731, 732 can be dimmed independently of one another. The first operating device 731 operates the first LED lighting elements 111 of all LED modules 120 of a lamp 300. It therefore enables the light output of the first LED lighting elements 111 and thus the relative proportion of ww light in the emitted light output to be adjusted. Similarly, the second LED operating device 732 enables the light output of the second LED lighting elements 112 of all LED modules 120 to be adjusted. The light output of the second LED lighting elements 112 and thus also the relative proportion of tw light in the emitted light output can thus be adjusted. The emitted light output can also be adjusted independently. 7 also shows a common control 730, which is implemented externally and can control the operating devices 731, 732 via a data connection, e.g. according to DALI. Alternatively, the control 730 can be included as an integrated controller in the lamp 300. The control 730 independently dims the two types of LED lighting elements 111, 112 via the dimmable operating devices 731, 732. In this way, for example, a circadian progression of the color temperature of the light emitted by the lamp 300 can take place according to a pre-programmed scheme.

List of reference symbols

• 1 , 2A-2B :

  101

  first board

  102

  second board

  104

  Tongue

  106

  Recess

  111

  first LED lighting elements

  112

  second LED lighting elements

  120

  LED module

  D1

  Center distance

  D2

  Center distance

• 3 :

  120

  LED module

  300

  lamp

  301

  Luminaire housing

  303

  Mounting body

• 4A-4B :

  111

  first LED lighting elements

  112

  second LED lighting elements

  401

  first board

  402

  second board

  406

  Recess

  407

  Insulating layer

  420

  LED module

  D1

  Center distance

  D2

  Center distance

• 5 :

  420

  LED module

  500

  lamp

  501

  Luminaire housing

  503

  Mounting body

• 6 :

  111

  first LED lighting elements

  112

  second LED lighting elements

  600

  lamp

  601

  Luminaire housing

  603

  Mounting body

  626

  Recess

  620

  LED module

  621

  first board

  622

  second board

• 7 :

  120

  LED module

  300

  lamp

  730

  steering

  731

  first operating device

  732

  second operating device

Claims (8)

Luminaire for mixing light colors, namely warm white (ww) and daylight white (tw) light from LED elements, comprising: a first circuit board (401; 621) with a plurality of first light sources (111) for generating light with a first light color, in particular with LED elements, wherein the light sources are arranged according to a predetermined assembly grid of the first circuit board; and a second circuit board (402; 622) with a plurality of second light sources (112) for generating light with a second light color, in particular with LED elements, wherein the light sources are arranged according to a predetermined assembly grid of the second circuit board; wherein one of the first and second light colors is a warm white (ww) light color and the other of the first and second light colors is a daylight white (tw) light color; characterized in that at least the first board (401; 621) has recesses (406; 626) which are provided in accordance with the assembly grid of the second board (402; 622) and in the area of which one or more second light sources (112) of the second board are positioned in order to enable a mixture of both light colors, wherein the assembly grid of the first and second circuit boards (401, 402; 621, 622) are regular and congruent and the first and second light sources (111, 112) are arranged regularly and alternately in at least one direction, wherein at least the first circuit board (401; 621) has through holes (406; 626) as recesses congruent with the component grid of the second circuit board, wherein the second circuit board (402; 622) is arranged behind the first circuit board (401; 621) and with at least some of the second light sources (112) aligned with the through holes (406; 626) in order to enable a mixture of both light colors. Light after Claim 1 , characterized in that at least in the first circuit board (401, 621) the light sources (111) and the bores (406, 626) are provided alternately in rows and the center distance (D1) between two rows of light sources (111) is identical to the center distance (D2) of the respectively adjacent rows of bores (406, 626), and preferably the drilling template and the assembly grid of the light sources correspond to a regular pattern. Lamp according to one of the Claims 1 until 2 , characterized in that the first and second circuit boards (401, 402; 621, 622) are preferably identical in an unpopulated state. Lamp according to one of the Claims 1 until 3 , characterized in that each circuit board (401, 402; 621, 622) is equipped with the same surface density and preferably at least 16 LED elements (111; 112) of the same type, in particular each with either a light color of less than 3300K or with a light color of more than 5300K. Lamp according to one of the Claims 1 until 4 , especially after Claim 7 , characterized in that the luminaire comprises at least one operating device, preferably two operating devices (731; 732), for supplying the first and second light sources (111; 112) in a manner that can be dimmed independently of one another, and preferably has an integrated control or can be connected to a control (730) for independently dimming the respective light sources according to a pre-programmed course, in particular a circadian course. Lamp according to one of the Claims 1 until 5 , , characterized in that the luminaire is designed as an interior luminaire, in particular a ceiling luminaire (300; 500; 600), wherein a plurality, in particular four, tile-like modules (420; 620) are provided in a luminaire housing (301; 501; 621) with a flat light exit opening, which are each composed of a first circuit board (401; 621) and a second circuit board (402; 622). Circuit board for a luminaire (300; 500; 600) according to one of the Claims 1 until 6 , wherein the circuit board (401, 402; 621, 622) is equipped with a plurality of light sources (111; 112) for generating light with a first light color, in particular with LED elements, wherein the light sources are arranged according to a predetermined assembly grid; characterized in that the circuit board is designed as the first circuit board (401; 621) of the luminaire (300; 500; 600) and has through holes (406; 626) as recesses, which are provided according to the component grid of its light sources (111; 112), so that in the region of each recess one or more light sources, in particular LED elements, of the second circuit board (402; 622) of the luminaire can be positioned, the component grid of which is regular and congruent with the component grid of the first circuit board (401; 621). LED module (120; 420; 620) for mixing light colors, comprising a first circuit board (101; 401; 621) with a plurality of light sources (111) of a first light color, which are arranged according to a predetermined assembly grid of the first circuit board (401; 621), and a second circuit board (102; 402; 622) with a plurality of light sources (112) of a second light color, which are arranged according to a predetermined assembly grid of the second circuit board (402; 622), wherein one of the first and second light colors is a warm white (ww) light color and the other of the first and second light colors is a daylight white (tw) light color, characterized in that at least the first circuit board has recesses (406; 626), in the area of which one or more light sources (112) of the second light color are positioned, wherein the The assembly grid of the first and second circuit boards (401, 402; 621, 622) is regular and congruent and the first and second light sources (111, 112) are arranged regularly and alternately in at least one direction, wherein at least the first circuit board (401; 621) has through holes (406; 626) as recesses that are congruent with the assembly grid of the second circuit board, wherein the second circuit board (402; 622) is arranged behind the first circuit board (401; 621) and with at least some of the second light sources (112) aligned with the through holes (406; 626) in order to enable a mixture of both light colors.

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