AT516656B1 - Extendible illuminant carrier and recessed luminaire - Google Patents

Abstract

The present invention provides a cut-to-length recessed luminaire with a lengthenable luminous means carrier (2) with light units (4), which are distributed over the illuminant carrier (2); with predetermined breaking points (2S), which subdivide the illuminant carrier (2) at least in sections into separating elements (10) with light units (4) located thereon, wherein the predetermined breaking points (2S) are each introduced into the illuminant carrier (2) such that the separating elements (10 ) at the associated predetermined breaking points (2S) of the light source carrier (2) are separable; and with switching devices (14), which are each associated with a predetermined separating element (10) and are designed, after separation of the associated separating element (10) during operation of the illuminant carrier (2) automatically a circuit through all on the illuminant carrier (2) remaining light units (4) and a support rail (3), on which the illuminant carrier (2) is mounted along this, wherein a first longitudinal portion (3A) of the support rail (3) as a supply unit (9) for the electrical supply of the light units (4) of Illuminant carrier (2) is formed, and wherein at least along a second longitudinal portion (3B) of the support rail (3) predetermined breaking points (3S, 2S) are provided in the support rail (3).

Description

SUMMARY OF THE INVENTION Against this background, the present invention is based on the object of providing a recessed luminaire which can be changed geometrically in a practical and rapid manner without requiring special specialist knowledge.

According to the invention this object is achieved by a recessed luminaire with the features of main claim 1.

[0010] The solution according to the invention provides a recessed luminaire which can be cut to length. The recessed luminaire has a lamp holder that can be cut to length. The illuminant carrier comprises lighting units which are distributed over the illuminant carrier. Furthermore, the illuminant carrier comprises predetermined breaking points, which at least in sections subdivide the illuminant carrier into separating elements with lighting units located thereon. The predetermined breaking points are each introduced into the illuminant carrier in such a way that the separating elements can be separated from the illuminant carrier at the associated predetermined breaking points. Furthermore, the illuminant carrier comprises switching devices which are each assigned to a predetermined separating element and are designed, after the associated separating element has been disconnected, to automatically close a circuit through all the lighting units remaining on the illuminant carrier during operation of the illuminant carrier. Furthermore, the recessed luminaire comprises a mounting rail, on which the lamp carrier is attached along this. In this case, a first longitudinal section of the mounting rail is designed as a supply unit for the electrical supply of the lighting units (of the lamp carrier. Furthermore, predetermined breaking points are provided in the mounting rail along at least a second longitudinal section of the mounting rail, the predetermined breaking points in the mounting rail and the predetermined breaking points in the lamp carrier jointly forming the second longitudinal section divide into separating elements which can be separated at the respective predetermined breaking points to shorten the length of the recessed luminaire.

One idea on which the present invention is based is to create a lamp carrier which can be shortened in length by separating elements at predetermined predetermined breaking points from the lamp carrier. Special switching devices ensure that the illuminant carrier automatically and automatically closes a circuit through all remaining lighting units after one or more separating elements have been removed as soon as the illuminant carrier is put into operation. The illuminant carrier advantageously recognizes the disconnection point to a certain extent itself. After disconnection, a user does not have to make any effort to bring the illuminant carrier into a functional state. For this purpose, a switching device is assigned to a predetermined separating element. If the associated separating element is separated from the illuminant carrier, the switching device closes a circuit through the lighting units remaining on the illuminant carrier. The corresponding switching device is therefore not located on the associated separating element and remains on the illuminant carrier after the associated separating element has been separated.

Another idea on which the present invention is based is to create a recessed luminaire with such an illuminant carrier, which can also be shortened in length. For this purpose, the recessed luminaire is divided into a longitudinal section which cannot be changed in length and a longitudinal section which can be cut to length. The non-detachable longitudinal section serves as a supply unit, which regulates the power supply of all the lamps located on the recessed light.

A particular advantage of the aspect of the solution according to the invention based on this idea is that the specific length of the recessed light is not fixed, but can be optimized by a user depending on the application. At the same time, the recessed luminaire according to the invention is particularly simple. After the disconnection of individual or several disconnection elements, no special tools or specialist knowledge are required to close a circuit using the lamps remaining on the built-in lamp. By separating individual or several separation elements

2.15

AT516 656 B1 2018-07-15 Austrian patent office thus the emission characteristics of the recessed luminaire can be changed particularly easily and practically.

When designing specific embodiments of the solution of the recessed luminaire according to the invention, care must be taken that the predetermined breaking points are formed in the lamp carrier in such a way that no short circuits or the like can occur in the area of the predetermined breaking points of the lamp carrier due to the separation of a separating element. If, for example, the illuminant carrier including the open cable ends protrude beyond the mounting rail, there is a risk of a short circuit due to contact with metallic components. In order to avoid this, the mounting rail and the illuminant carrier can be designed, for example, such that the outer end of the illuminant carrier remaining on the recessed light after the separation of a separating element is offset with a recess relative to the outer end of the mounting rail or is flush with the latter.

[0015] A predetermined breaking point in the sense of the invention can be formed, for example, by means of perforations and / or connecting webs or the like. In addition, however, in the context of the invention, predetermined breaking points are also understood to mean areas which only comprise markings or the like. Such markings indicate to the user, for example, by means of colored lines or other marking, at which point a separation can be carried out.

Advantageous refinements and developments result from the further subclaims and from the description with reference to the figures.

According to a further development of the recessed luminaire, a disconnection line is connected to a respective switching device in such a way that the disconnection line is interrupted by disconnecting the associated disconnection element, thereby activating the switching device during operation of the lamp holder and a circuit through all those remaining on the lamp holder Light units is closed. This development offers a simply designed solution for a circuit which automatically and automatically ensures that the circuit is always closed by all the lighting units remaining on the illuminant carrier during operation of the illuminant carrier. The disconnection of a disconnection element interrupts the associated disconnection line, which in turn automatically ensures that the switching device closes the circuit through the remaining lighting units.

[0018] The switching devices can each comprise a transistor. The switching devices can in particular each have a bipolar transistor and / or a field effect transistor, e.g. a MOSFET. The switching device thus advantageously contains an actively switchable semiconductor component, such as can be inexpensively integrated in a miniaturized form on a lamp carrier. Such a transistor can be, for example, a MOSFET (metal oxide semiconductor field effect transistor). In principle, however, alternative suitable transistor technologies can also be used.

[0019] Furthermore, the respective transistor can be designed as an n-channel MOSFET or p-channel MOSFET. The MOSFET can also be self-locking (e.g. n-channel) or self-conducting (e.g. p-channel). A self-blocking MOSFET is particularly advantageous, for example, in an embodiment with a disconnection line. The disconnection line can short-circuit the gate electrode and source electrode of the normally-off MOSFET of the respective switching device. If the associated disconnection element is disconnected from the illuminant carrier, this disconnection line is interrupted and the gate electrode can be raised to a higher potential than the source electrode if the lighting units are connected appropriately. This activates the switching device, i.e. the drain-source connection becomes conductive and the circuit through the lighting units can be closed automatically. In principle, other alternative transistor technologies are also provided instead of or in addition to MOSFETs (if necessary with correspondingly adapted interconnection).

According to a further development of the recessed luminaire, the illuminant carrier can be connected to the target 3/15

AT516 656 B1 2018-07-15 Austrian patent office perforated parts. This development offers the advantage that the illuminant carrier can be easily severed for removing individual severing elements.

The illuminant carrier can also be perforated so that it can be bent at the predetermined breaking points by hand without the use of tools. The lamp holder can advantageously be cut without any tools, so that the separating elements can be removed particularly easily.

In a further development of the recessed luminaire, the illuminant carrier can be designed as an aluminum circuit board, aluminum core circuit board, hard paper circuit board, plastic circuit board or flexible LED carrier or the like. The circuit board or the flexible LED carrier can in turn carry a large number of LEDs or other illuminants. Printed circuit boards or flexible supports are typical, practically usable illuminant supports. Printed circuit boards with a metal core, in particular a core made of aluminum, offer, for example, good cooling properties, the core being usable for dissipating heat from the lamp carrier. Printed circuit boards made of hard paper or similar paper-like materials are particularly cheap to manufacture and can also be assembled in a practical manner.

[0023] In one development, the illuminant carrier can contain plastic. In particular, the illuminant carrier can contain fiber-reinforced plastic. A plastic lamp holder is inexpensive to manufacture and easy to process. In particular, such a lamp carrier can be easily perforated. Fiber-reinforced plastic is characterized by its high stability and low weight.

According to a development of the built-in lamp, the lighting units can have LEDs and / or chip-on-board LED modules. The LED technology is particularly advantageous due to its energy efficiency, diverse design options, miniaturization, durability and robustness. Individual LEDs can be provided, which are distributed over the illuminant carrier, but also LED strips or other geometrical arrangements of LEDs. In addition, LEDs of different colors can be attached, for example. In addition, complex operating modes are also possible in which the individual LEDs are dimmable or are controlled in a time-dependent manner to vary the brightness. In the case of CoB modules, LED chips are bonded directly to a circuit board, for example an aluminum circuit board. Due to the excellent heat conduction properties of this structure, a large number of chips can be accommodated in a CoB module in a small space. Such CoB modules are very bright and at the same time extremely space-saving.

According to a development of the recessed luminaire, the predetermined breaking points in the mounting rail and the illuminant carrier can be aligned with each other for each separating element. This further development has the advantage that both the mounting rail and the illuminant carrier can be cut through for each separating element at a specific fixed position in the longitudinal direction of the mounting rail at the predetermined breaking points aligned with one another. This makes the design of the recessed luminaire particularly simple and practical. As an alternative, however, versions are also provided in which the predetermined breaking points in the mounting rail and the lamp holder are not in alignment.

According to a further development, the mounting rail can be made of metal. The mounting rail can in particular consist of aluminum. For example, the mounting rail can be produced by means of an extrusion process, in which a block made of metal is pressed through a molding die. A metal mounting rail also serves in particular as a heat sink for the recessed light.

[0027] In a further development, the mounting rail can be formed with connecting webs at the predetermined breaking points. The connecting webs can be structured so that they can be cut with a hand saw. Such a connection of the individual partition elements creates a recessed luminaire with a certain basic stability, which is suitable for transport and assembly. On the other hand, the connecting webs are made sufficiently thin so that they are easy to cut through for removing individual separating elements. In the event of

4.15

AT516 656 B1 2018-07-15 Austrian patent office of a mounting rail made of aluminum, these can easily be sawed through with an iron hand saw or the like.

The predetermined breaking points in the mounting rail and the illuminant carrier can be formed at equal relative distances from one another along the mounting rail. Such a recessed light can be shortened in predetermined, identical steps. For example, the mounting rail can have a total length of 1200 mm, whereby one half (i.e. 600 mm) forms the supply unit and the other half is divided into 12 separating elements, each 50 mm long. The length of such a recessed luminaire can be varied between 600 mm and 1200 mm in steps of 50 mm.

[0029] Furthermore, the separating elements can be designed identically to one another. In particular in connection with the previous development, such a recessed luminaire offers an aesthetically uniform lighting system which can be adjusted in length in predetermined steps.

According to a further development, reflectors can be formed on the mounting rail for reflecting light which is emitted by the lighting units. For example, two reflectors can be attached symmetrically or asymmetrically to both long sides of the lamp carrier in order to ensure certain radiation characteristics of the installation light. Advantageously, the mounting rail can be formed in one piece together with the reflectors as a metal part, which can be produced, for example, in an extrusion process.

Furthermore, fasteners can be formed along the mounting rail for mounting the mounting rail in an installation profile in a ceiling, a wall and / or a floor. Such fastening elements can be attached to the supply unit and / or to the separating elements in order to make the fastening of the recessed luminaire as flexible as possible.

According to a further development, the supply unit can have an electrical ballast for operating the lighting units. In this embodiment, the recessed luminaire offers a complete installation system that can be connected directly to a power supply.

The above refinements and developments can, if appropriate, be combined with one another as desired. Further possible refinements, developments and implementations of the invention also include combinations of features of the invention described above or below with reference to the exemplary embodiments, which are not explicitly mentioned. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention.

CONTENTS OF THE FIGURES The present invention is explained in more detail below with reference to the exemplary embodiments given in the schematic figures. It shows:

1a, 1b are schematic representations of shortenable LED boards according to the prior art, [0036] FIG. 2 is a schematic representation of a lamp carrier according to one

Embodiment of the downlight according to the invention, and [0037] FIG. 3 shows a perspective view of a downlight according to the invention obliquely from above according to one embodiment.

The accompanying figures are intended to convey a further understanding of the embodiments of the invention. They illustrate embodiments and, in conjunction with the description, serve to explain principles and concepts of the invention. Other embodiments and many of the advantages mentioned result from the drawings. The elements of the drawings are not necessarily shown to scale with respect to one another.

5.15

AT516 656 B1 2018-07-15 Austrian Patent Office [0039] In the figures of the drawing, elements, features and components that are the same, have the same function and have the same effect - unless otherwise stated - are provided with the same reference numerals.

DESCRIPTION OF EXEMPLARY EMBODIMENTS [0040] FIG. 2 shows a schematic illustration of a lamp carrier according to an embodiment of the recessed luminaire according to the invention.

In Fig. 2, reference numeral 2 denotes the illuminant carrier. The illuminant carrier 2 can be an aluminum circuit board, for example. Alternatively, however, designs are also provided as a plastic circuit board, possibly with an aluminum core, as a hard paper circuit board or the like. In principle, the illuminant carrier 2 can be rigid or can be configured flexibly.

[0042] The illuminant carrier 2 is divided into separation elements 10 by predetermined breaking points 2S. The predetermined breaking points 2S can be designed, for example, as perforations that are dimensioned such that the individual separating elements 10 can be bent manually and without the use of any tools. In any case, the illustrated illuminant carrier 2 can be shortened in length by consecutively separating individual separating elements 10. In this exemplary embodiment, the separation is carried out consecutively from right to left.

[0043] Each separating element comprises a lighting unit 4, which can comprise one or more LEDs, for example. Alternatively, the lighting unit can have one or more CoB modules (chip-on-board module) or corresponding LED-based lamps. Furthermore, other illuminants can be provided or a combination of different illuminants. In principle, it is also possible to distribute a plurality of lighting units 4 to a separating element 10. The circuit shown here can be seen purely by way of example and can be redesigned.

The embodiment of the solution according to the invention shown in FIG. 2 uses an interconnection of the lighting units 4 with constant current in an energy-efficient manner. The circuit is closed after the disconnection of one or more disconnection elements 10 by switching devices 14. For this purpose, each separating element 10 has a self-locking n-channel MOSFET as a switching device 14.

The switching device 14 is kept open via a disconnection line 15. For this purpose, the disconnection line 15 is connected to the gate electrode and the source electrode of the switching device 15. In this case, the separation line 15 continues to be routed beyond the corresponding predetermined breaking points 2S to the downstream separation element 10. If the downstream separating element 10 is present, the respective separating line 15 remains closed and the associated switching device 14 is kept open. Should the downstream separation element 10 be separated, however, the separation line 15 is interrupted. The gate electrode of the switching device 14 is controlled via an upstream resistor 13. The forward voltage of the lighting unit 4, for example an LED, during operation of the illuminant carrier 2 means that the gate electrode is consequently connected to a higher potential. If the downstream disconnection element 10 is now removed and the disconnection line 15 is thus cut through, the switching device 14 is activated via the higher potential of the resistor 13 at the gate electrode and is brought into the conductive state. The circuit is consequently closed via the connection between the drain and source electrodes of the MOSFET. In the switch-on phase of the illuminant carrier 2 with previously switched off lighting units 4, only a rising open circuit voltage is initially generated by the constant current source, since, for example in the case of a MOSFET, when the switching device 14 is switched off, no current flows and therefore no voltage drops at the lighting unit 4. After a short time, this open circuit voltage exceeds the threshold voltage of the MOSFET, so that it switches and current flows through the lighting unit 4.

6.15

AT516 656 B1 2018-07-15 Austrian patent office [0046] The illustrated lamp holder 2 thus “automatically recognizes whether a separating element 10 has been disconnected and automatically closes the circuit through all the lighting units 4 remaining on the lamp holder 4. Special expertise or tools are required for this not required. A user only has to remove the desired number of separating elements 10 in order to bring the illuminant carrier 2 to the desired length.

Fig. 3 shows a perspective view of a recessed luminaire according to the invention obliquely from above according to one embodiment.

In Fig. 3, reference numeral 1 designates the downlight. This recessed luminaire 1 is provided for mounting in a ceiling, a wall or a floor. For example, the recessed light 1 can be installed in a recess in a ceiling. Alternatively, the recessed luminaire 1 can also be installed in any other ceilings, walls or floors that are located, for example, in outside areas, in vehicles or aircraft, etc.

The downlight 1 comprises an elongated mounting rail 3, on one long side of which a lamp carrier 2 is fixedly attached. The illuminant carrier 2 extends along the mounting rail 3 and is covered with a multiplicity of lighting units 4. The recessed light 1 is designed to emit light via the light units 4. The support rail 3 is formed with symmetrical reflectors 8 on both long sides of the illuminant carrier 2. The reflectors 8 serve to bundle the light emitted by the lighting units 4 away from the illuminant carrier 2 or the recessed luminaire 1 in order to achieve optimal lighting.

The downlight 1 is equipped with a plurality of fastening elements 7 along the mounting rail 3, which are designed for mounting the mounting rail 3 or the downlight 1 in a mounting profile, for example in a recess in a ceiling. Such fasteners 7 can be, for example, screw or plug connections for the direct connection of the mounting rail 3 in an installation profile. Alternatively, these can also be interlocks which can be connected to corresponding attachments on the underside of the built-in lamp 1, which in turn are fastened directly in a built-in profile.

The mounting rail 3 is a component made of aluminum with a total length of 1200 mm, which is formed in one piece with the reflectors. For example, such a mounting rail 3 can be produced using an extrusion process. In contrast, in this exemplary embodiment, the illuminant carrier 2 is a plastic component with a core made of aluminum. For example, the illuminant carrier 2 from FIG. 2 could also be installed in the recessed light 1. Alternatively, other designs of the lamp holder 2 are also provided, for example as a printed circuit board made of plastic, metal or a paper-like material. Alternatively, the illuminant carrier can also be a flexible LED carrier, e.g. a so-called flex strip. The mounting rail 3 (or the built-in lamp 1) is divided into a first longitudinal section 3A of 600 mm in length and a second longitudinal section 3B of likewise 600 mm in length. The first longitudinal section 3A is designed as a supply unit 9 for the electrical supply of the lighting units 4 on the illuminant carrier 2. In the second longitudinal section 3B, predetermined breaking points 3S are formed in the mounting rail 3 along the mounting rail 3. These predetermined breaking points 3S of the mounting rail 3 are each aligned with corresponding predetermined breaking points 2S in the illuminant carrier 2. Together, the predetermined breaking points 3S, 2S of the mounting rail 3 and the illuminant carrier 2 divide the second longitudinal section 3B into a total of twelve separating elements 10. The separating elements 10 are in each case identical sections of the mounting rail 3 with the lamp holder 2 fastened thereon.

It should be noted in this exemplary embodiment that the mounting rail 3 itself is continuously connected between the individual sections only at the predetermined breaking points 3S on the lower edge of the mounting rail.

The mounting rail 3 is at the predetermined breaking points 3S with connecting webs of a few

7/15

AT516 656 B1 2018-07-15 Austrian

Patent Office

Millimeters thick. The illuminant carrier 2 is perforated at the predetermined breaking points 2S. The separating elements 10 are connected to one another exclusively via the connecting webs of the mounting rail 3 and the perforated regions of the lamp holder 2. The illuminant carrier 2 is perforated in such a way that it can be bent manually at the predetermined breaking points 2S without the use of additional tools. The connecting webs of the mounting rail 3 are so thin that they can be easily and quickly severed by means of a hand saw (e.g. an iron hand saw) or the like, but at the same time ensure a sufficiently large basic stability of the recessed light 1.

The lighting units 4 are LEDs which are distributed over the illuminant carrier 2 and are operated and controlled by an electrical ballast (not shown) installed in the supply unit 9. For example, the LEDs can be white in color for the most homogeneous illumination possible. Additionally or alternatively, the LEDs can also be dimmable. In principle, however, any other color designs or color temperatures and designs of the LEDS are provided, as can be found in commercially available LED-based lights. Furthermore, other illuminants can be provided or a combination of different illuminants. In addition to individual LEDs, CoB modules can alternatively or additionally be distributed over the lamp carrier.

The adaptation of the length of this embodiment of the recessed luminaire 1 according to the invention will be explained below with reference to this figure. The distal end of the recessed luminaire 1 with respect to the supply unit 9 is formed by the separating element 10 shown at the far left in FIG. 3. This separating element 10 is connected on the rear side via predetermined breaking points 3S, 2S on the mounting rail 3 and the illuminant carrier 2 to the next separating element 10 of the built-in lamp 1.

The recessed lamp 1 can be shortened in length by separating the front separating element 10 from the recessed lamp 1. For this purpose, it is only necessary to cut the connecting webs between this separating element 10 and the adjacent separating element 10, for example using an iron hand saw, and then to bend the illuminant carrier 2 at the perforated predetermined breaking point 2S. The circuit with the supply unit 9 is closed automatically and automatically by the corresponding switching device 14 on the adjacent separating element 10. In an analogous manner, further cut-off elements 10 can now be cut off consecutively from the recessed light 1 until the desired length is reached. The uncut carrier rail 3 has a length of 1200 mm, while the separable longitudinal section is divided into twelve separating elements 10, each 50 mm thick, in the longitudinal direction of the carrier rail 3. Accordingly, it is possible to vary the length of the recessed luminaire 1 between 600 mm and 1200 mm in steps of 50 mm.

In contrast to conventional pre-perforated LED boards, no special knowledge or tools are required in the case of the present invention in order to shorten the built-in lamp 1 or the lamp holder, i.e. for example, no soldering is necessary. In addition, the present invention provides a finished overall concept for a recessed luminaire 1, in which both an illuminant support 2 with lighting units 4 and the associated mounting rail 3 can be adjusted in length in a practical manner.

[0058] Although the present invention has been fully described above with the aid of preferred exemplary embodiments, it is not restricted to this but can be modified in a variety of ways.

In principle, for example, versions of the recessed luminaire 1 are also provided, in which the separating elements 10 are designed differently or the predetermined breaking points 3S, 2S are not arranged at regular intervals. For example, it is also provided that separating elements 10 are formed on both sides of a supply unit 9, which also have different geometries depending on the distance from the supply unit 9. Alternatively, the predetermined breaking points 3S of the mounting rail can also be designed such that they can be severed, for example, by simply kinking or breaking them off by hand. On the other hand, the predetermined breaking points 2S of the lamp holder 2 can also provide more stable connections

8.15

AT516 656 B1 2018-07-15 Austrian patent office, which can be severed with a hand saw or the like, similar to the predetermined breaking points 3S of the mounting rail 3. In principle, versions of the recessed luminaire 1 are also possible in different sizes from a few centimeters to a total length of several meters.

9.15

AT516 656 B1 2018-07-15 Austrian patent office

LIST OF REFERENCE NUMBERS

recessed light

Lamp support

2S predetermined breaking point

rail

3A First longitudinal section

3B second longitudinal section

3S predetermined breaking point

light units

fastener

reflector

supply unit

separating element

connector

Distal end

resistance

switching device

separation line

10/15

AT516 656 B1 2018-07-15 Austrian patent office

Claims (14)

claims 1. Cutable recessed luminaire (1), with: with a cut-to-length lamp carrier (2) Luminaire units (4), which are distributed over the illuminant carrier (2), predetermined breaking points (2S), which at least partially divide the illuminant carrier (2) into separating elements (10) with lighting units (4) located thereon, the predetermined breaking points (2S) in each case in this way are introduced into the illuminant carrier (2) such that the separating elements (10) can be separated from the illuminant carrier (2) at the associated predetermined breaking points (2S), and Switching devices (14), each of which is assigned to a predetermined separating element (10) and which are designed, after the associated separating element (10) has been disconnected, during the operation of the illuminant carrier (2) to independently conduct a circuit through all the lighting units (4) remaining on the illuminant carrier (2) ) close; and a mounting rail (3) on which the illuminant carrier (2) is attached along this; wherein a first longitudinal section (3A) of the mounting rail (3) is designed as a supply unit (9) for the electrical supply of the lighting units (4) of the lamp holder (2); and wherein at least along a second longitudinal section (3B) of the mounting rail (3) predetermined breaking points (3S) are provided in the mounting rail (3), the predetermined breaking points (3S) in the mounting rail (3) and the predetermined breaking points (2S) in the illuminant carrier ( 2) jointly divide the second longitudinal section (3B) into separating elements (10) which can be separated at the respective predetermined breaking points (3S, 2S) in order to shorten the length of the recessed light (1). 2. Cutable recessed luminaire (1) according to claim 1, characterized in that in each case a separation line (15) is connected and designed with a respective switching device (14) in such a way that the separation line (15) is interrupted by separation of the associated separation element (10) , as a result of which the switching device (14) is activated during operation of the lamp holder (2) and a circuit is closed by all the lamp units (4) remaining on the lamp holder (2). 3. Cutable downlight (1) according to claim 1 or 2, characterized in that the switching devices (14) each comprise a transistor. 4. Cutable downlight (1) according to claim 3, characterized in that the transistor is designed as an n-channel MOSFET or p-channel MOSFET. 5. Cutable downlight (1) according to claim 4, characterized in that the respective disconnection lines (15) short-circuit the gate electrode and source electrode of the self-locking MOSFET of the respective switching device (14). 6. Cutable downlight (1) according to one of the preceding claims, characterized in that the illuminant carrier (2) is perforated at the predetermined breaking points (2S). 7. Cutable downlight (1) according to claim 6, characterized in that the illuminant carrier (2) is perforated in such a way that it can be bent manually at the predetermined breaking points (2S) without the use of additional tools. 11/15 AT516 656 B1 2018-07-15 Austrian patent office 8. Cutable downlight (1) according to any one of the preceding claims, characterized in that the illuminant carrier (2) is designed as an aluminum circuit board, aluminum core circuit board, hard paper circuit board, plastic circuit board or flexible LED carrier. 9. Cut-to-length luminaire (1) according to one of the preceding claims, characterized in that the lighting units (4) have individual LEDs and / or chip-on-board LED modules. 10. Cut-to-length luminaire according to one of the preceding claims, characterized in that the predetermined breaking points (3S, 2S) in the mounting rail (3) and the illuminant carrier (2) are aligned with each other for each separating element (10). 11. Cut-to-length luminaire according to one of the preceding claims, characterized in that the mounting rail (3) is formed at the predetermined breaking points (3S) of the mounting rail (3) with connecting webs which can be severed by means of a hand saw. 12. Cut-to-length luminaire according to one of the preceding claims, characterized in that the predetermined breaking points (3S, 2S) in the mounting rail (3) and the illuminant carrier (2) are formed at equal relative distances from one another along the mounting rail (3). 13. Cutable downlight according to one of the preceding claims, characterized in that the separating elements (10) are identical to each other. 14. Cut-to-length luminaire according to one of the preceding claims, characterized in that fastening elements (7) are formed along the mounting rail (3) for mounting the mounting rail (3) in a mounting profile in a ceiling, a wall and / or a floor.