DE102019102056A1 - Reflector lamp with three-dimensional light engine - Google Patents

Abstract

The present invention relates to a lamp, in particular a reflector lamp with an improved arrangement of a light engine and light emission distribution. Accordingly, a lamp is specified which has a reflector (24) with a cavity (26) and a light engine (10), the light engine (10) forming a passage and having a frame structure or support structure and inclined areas (16) with a each light source (18), and wherein a light emission distribution from an upper opening (28) of the reflector (24) is predetermined by the arrangement or height of the light engine (10), the inclination of the areas (16) and the reflector (24) is.

Description

Technical field

The present invention relates to a lamp, in particular a reflector lamp with an improved arrangement of a light engine and light emission distribution.

State of the art

In order to provide a desired radiation angle and a sufficient light distribution in conventional reflector lamps, lenses are generally used in addition to the reflector, so that the light emitted from the lamp can be concentrated in a predetermined area and thus a desired light distribution is achieved in the area. However, such beam-shaping lenses add complexity to the design and manufacture of the lamp.

Furthermore, lenses with little or nonexistent beam-shaping properties in lamps, in which a light engine is used to generate light, are often attached to the upper end of the reflector due to the two-dimensional design of the light engine. However, this has the disadvantage that a large part of the reflector is covered and is therefore no longer visible. This changes the appearance so that the lamp only slightly resembles a classic halogen lamp preferred by the user.

An alternative arrangement of a beam-shaping lens at the lower end of the reflector also leads to a smaller size of the light engine, so that it can be equipped with a smaller number of LEDs and at the same time less space is provided for the driver required for the light engine. This means that both the lighting engine complexity and the light output can be significantly reduced.

Furthermore, such an arrangement can result in the cooling capacity being reduced if, for example, the inner surface of the reflector simultaneously has a heat-conducting property.

Accordingly, there is a need to develop a light engine that generates the desired light distribution with the help of the existing reflector and makes it visible.

Presentation of the invention

Starting from the known prior art, it is an object of the present invention to reduce the above disadvantages and to provide an improved lamp, in particular a lamp with a visible reflector and at the same time the desired light distribution.

The object is achieved by a lamp with the features according to the independent claim. Advantageous further developments result from the subclaims, the description and the drawings.

Accordingly, a lamp or a lighting device or a light source is proposed which has a reflector which extends in a longitudinal direction of the lamp and forms a cavity with an inner diameter which increases in the longitudinal direction up to an opening. The lamp further has a light engine which is arranged in the cavity, the light engine having at least three sections which extend in the longitudinal direction and which are laterally flexibly connected to one another so that the sections form a passage, each of the sections at one the opening inclined end has a region which is flexibly connected to the respective section and is inclined towards the passage, each region having a light source. A distribution of light from the opening is determined by the arrangement of the light engine, the inclination of the areas and the reflector.

The inclination of the areas or the LEDs on the light engine makes it possible for the direction of radiation to be adapted to the shape of the reflector and the desired beam angle, which was previously not possible with conventional two-dimensional light engines.

Furthermore, the light engine can be inserted into the reflector in such a way that the light emitted by the LEDs can be matched to the reflector. The radiation angle and the intensity of the emitted light can be changed by varying the height or the placement of the light engine and thus the LEDs.

Correspondingly, a desired light emission distribution from the opening can be predetermined by a predetermined inclination of the areas and a certain arrangement or height of the placement of the light engine, so that an additional (beam-shaping) lens can be dispensed with. The manufacture of the lamp is thus made easier and less expensive, while at the same time the number of sensitive components is reduced, so that the lamp is also more robust.

By dispensing with the lens, it is also possible for a larger area of the reflector to be visible. Thus, for example, if the light engine is inserted deep in the reflector or at the lower end of the reflector, an optical design can be achieved which is similar to a conventional halogen lamp and is therefore more aesthetically pleasing, so that user acceptance is increased. Furthermore, such an arrangement provides an improved cooling effect, especially since the heat generated by the LEDs or by a driver of the lamp can easily diffuse out of the lamp, for example if the light engine is thermally connected to the reflector by means of adhesive or potting.

Due to the support structure of the light engine or the passage, the thickness of the light engine is kept small. In other words, no solid body is used, so that the passage is surrounded by a frame structure. In addition, potting can be provided in the lower region of the reflector or in a base or housing of the lamp, which pots connect the light engine and / or a driver to the housing or the reflector, so that improved heat dissipation to the outside is provided.

A three-dimensional light engine is also provided by the support structure or frame structure and the inclined regions. This makes it possible to provide the desired beam angle and the desired light distribution together with the reflector and at the same time offers an enlarged area to arrange a sufficient number of LEDs, so that a larger number of light sources can be arranged or a higher number than a two-dimensional light engine LED density is reached. The light engine can thus be used in the lower region of the reflector without the light output being reduced in comparison with a larger two-dimensional surface in the upper region of the reflector. Furthermore, the reflector properties can also be used optimally.

The sections of the light engine are preferably formed from a carrier material, preferably from PCB material, the light sources being LEDs or LED chips. Thus, the light engine or the light generating device can be an LED-based light engine, which is provided by a printed circuit board.

Such a printed circuit board or such a carrier can be formed, for example, from a PCB material, the sections not being flexible, but being connected to one another by flexible connecting elements or regions. The inclined areas can also be connected to the respective sections via such flexible connecting elements. The inclined areas thus form tabs of a so-called "Rigid-Flex-PCB". This is a flexible, foil-like printed circuit board, which, for. B. is applied to an aluminum support, which may receive recesses for better flexibility. Alternatively, the use of a bendable MCPCB is also possible. Accordingly, the light engine can form a three-dimensional PCB.

The connecting elements are preferably formed in one piece with the sections and regions, so that the light engine is made from a single piece of the carrier material, for example PCB. For example, the connecting elements can be formed by a respective tapering of the carrier material.

In order to achieve the desired direction of radiation, the reflector can also be conical, parabolic, or funnel-shaped, optionally with one or more steps. However, the shape can also deviate from an exactly conical shape, for example, so that the reflector is only approximately conical. This enables the desired light distribution to be generated even more precisely.

The lamp is thus preferably a spot lamp, the reflector preferably having a shape known from the halogen lamps. The essentially conical, parabolic or funnel-shaped configuration has the effect that the light emitted by the light source, for example an LED, can be concentrated on a specific radiation angle range, while at the same time providing a more homogeneous light with increased intensity for this region.

For this purpose, the reflector has a reflective surface in the cavity, which extends uniformly or homogeneously or can be faceted.

The reflector preferably has a lower end in the region with the smallest inside diameter, the light engine being arranged at the lower end. In other words, the light engine can be inserted or placed in a deep or lower area of the reflector. Due to this relatively low placement of the light engine, the reflector properties can be optimally used.

Because the height of the light engine influences the radiation pattern, the exact height of the light engine or the placement can be varied depending on the desired radiation pattern. For example, even slight differences in height of the inclined areas can result in a changed light emission distribution with different light fluxes and intensities being provided. Accordingly, the arrangement of the light engine can exactly match the shape of the reflector and the inclination of the areas or the LEDs can be adjusted.

The lamp can also have a base which is connected to the lower end of the reflector, preferably adjacent to the reflector, the base having a driver which is connected to the light engine.

A driver, for example a driver circuit on a PCB, can be provided for LEDs, for example, and can be arranged in the base or in the lamp housing. Thus, the driver for contacting or connecting to the light engine can be arranged in the immediate vicinity of the light engine and at the same time the available space in the lower region of the reflector can be optimally used by the light engine.

Furthermore, the light engine can be at least partially accommodated in the base, the inclined regions being arranged in the cavity of the reflector. As a result, only the part of the light engine, which is equipped with light sources or LEDs, can be located in the cavity, so that the light sources can be used even deeper. In this way, for example, an improved use of the reflector surface can be provided and at the same time a larger part of the reflector becomes visible, so that the aesthetic effect is further improved. For this purpose, the base can have, for example, a receptacle or a cavity or a cavity, in which the sections of the light engine can be at least partially accommodated.

The light engine preferably has four or five sections, the angle between the sections preferably being the same. The light engine or the support structure is preferably essentially annular.

For example, identical angles between the respective sections can provide more homogeneous or more uniform light radiation. A ring-shaped design can also facilitate insertion, for example through a symmetrical arrangement of the light engine. A ring shape can be provided, for example, by a curved shape of the sections or by rounding off the connection areas between the sections. For example, a light engine with four curved sections can thus resemble a ring shape, or a light engine with more sections can have a ring shape by corresponding rounding without having to be circular.

A higher number of sections also enables a higher number of light sources at the same time. With four and five sections, four or five LEDs can also be arranged on the light engine, so that the light intensity and the luminous flux can be increased.

Furthermore, a ring structure can be formed more easily with four or five sections, for example by partially curved sections in a square arrangement or by a pentagonal arrangement.

Depending on the desired light intensity or radiation distribution, however, more sections, for example six, seven or eight sections, may also be present, the light engine also being able to have other shapes, for example a star shape, a trapezoid shape or an ellipsoid shape.

In order to provide a lamp with an increased light intensity and an improved light emission distribution, the angle of inclination between the respective area and the respective section is preferably between 25 ° and 60 °, preferably between 30 ° and 55 °. The angle is particularly preferably approximately 45 ° or approximately 55 °. This means that the reflector surface can be used optimally and a more homogeneous radiation distribution with increased light intensity is provided. In particular, a radiation angle of 35 ° or 36 ° present in conventional halogen lamps can thus be achieved, the radiation angle likewise being able to have a certain tolerance, for example of 25 percent.

The angle of inclination between the respective region and the respective section is to be understood in such a way that the longitudinal ends of the regions are essentially inclined towards one another. Alternatively, however, the regions can also be inclined away from one another so that they are inclined towards the inner surface of the reflector.

In order to further facilitate the inclination of the areas and to reduce the space occupied by them, it can further be provided that the areas taper towards the opening. In other words, the regions can have a tailored shape, for example an essentially triangular or pyramid-shaped shape.

In the connection area between the area and the respective section, the area can also be rounded or have a recess, so that the adjacent areas form an opening here, which further improves the inclination of the areas.

The areas preferably adjoin one another laterally. As a result, the available space or space in the cavity of the reflector is optimally used and the aesthetic effect is further improved.

Furthermore, it can be provided that the regions at the longitudinal ends define a central opening. In other words, the ends of the areas which are inclined towards one another in the direction of the passage can be spaced apart from one another, so that an improved passage is provided. For example, the opening can be used to hold further components, for example an antenna or a centering device for inserting the light engine into the reflector.

Although the inclination of the areas and the light sources fitted thereon already achieve an improved light intensity or luminous flux and light distribution compared to a two-dimensional configuration, it can further be provided that light sources are arranged on one or more sections. Thus, the sections which extend in the longitudinal direction of the lamp or are arranged upright or essentially vertically can optionally contain further LEDs, for example.

For example, in a light engine with four sections, it can be provided that in addition to the four light sources or LEDs on the four areas, at least one section also has a light source or LED. For example, two, three or all four sections can be equipped with one LED, so that there are a total of 5, 6, 7 or 8 LEDs. The light sources on the respective sections protrude into the cavity of the reflector or are not arranged in a base.

With five sections, there can also be a total of 6, 7, 8, 9 or 10 light sources or LEDs, depending on the desired configuration and the luminous flux required.

For improved cooling of a driver of the lamp, it can further be provided that the reflector has a lower opening in the region with the smallest inside diameter, which at least partially surrounds a driver of the lamp.

The driver and / or the light engine can be thermally connected to the reflector and / or the housing by means of adhesive or potting, so that the heat generated by the driver can be dissipated better.

The light engine is preferably arranged around the driver, so that the passage of the light engine can be used even more efficiently. Accordingly, the light engine or the inclined regions can likewise cover or conceal the driver extending into the passage of the light engine. As a result, the small space in the lower area of the reflector is optimally used and the presence of the light engine is not influenced by the driver and vice versa.

To further protect the electronic components located in the reflector, the lamp can have a translucent cover which at least partially, preferably completely, covers the opening. This cover can be a flat or slightly curved glass or plastic pane.

As already explained above, the arrangement of the light engine and its three-dimensional shape and the interaction with the reflector make it possible to dispense with a beam-shaping lens or special optics. The cover can thus be a simple, even or uniform pane, which is transparent or can optionally have a (colored) coating. The cover can completely close off the reflector, so that not only is electrical safety guaranteed, but the electronic components in the reflector are also protected against contamination or moisture.

Furthermore, a lamp is specified which has a lamp described above. The lamp can be inserted into the lamp, for example, and can be electrically conductively connected to the lamp or an energy source, for example, by pins. Alternatively, one or more lamps described above can also be integrated in the luminaire, so that they are permanently installed in the luminaire.

Figure list

• 1 eine perspektivische schematische Darstellung einer Lightengine mit fünf Abschnitten;
• 2 eine perspektivische schematische Schnittdarstellung einer Lampe mit einer im Reflektor eingesetzten Lightengine und einer Abdeckscheibe;
• 3 eine schematische Darstellung einer Lampe in einer perspektivische Oberansicht;
• 4 eine perspektivische schematische Schnittdarstellung einer Lampe mit einem im Sockel eingesetzten Treiber;
• 5 eine Lichtabstrahlungsverteilung einer Lightengine mit fünf Abschnitten und fünf LEDs;
• 6A eine Lichtabstrahlungsverteilung einer Lightengine mit vier Abschnitten und 8 LEDs;
• 6B eine Lightengine mit vier Abschnitten und 8 LEDs; und
• 6C eine Lightengine gemäß 6B eingesetzt in einer Lampe für eine Lichtabstrahlverteilung gemäß 6A.

Preferred further embodiments of the invention are explained in more detail by the following description of the figures. Show:

• 1 a perspective schematic representation of a light engine with five sections;
• 2nd a perspective schematic sectional view of a lamp with a light engine used in the reflector and a cover plate;
• 3rd a schematic representation of a lamp in a perspective top view;
• 4th a perspective schematic sectional view of a lamp with a driver used in the base;
• 5 a light emission distribution of a light engine with five sections and five LEDs;
• 6A a light emission distribution of a light engine with four sections and 8 LEDs;
• 6B a light engine with four sections and 8 LEDs; and
• 6C according to a light engine 6B used in a lamp for light distribution according to 6A .

Detailed description of preferred embodiments

Preferred exemplary embodiments are described below with reference to the figures. Identical, similar or equivalent elements in the different figures are provided with identical reference numerals, and a repeated description of these elements is partially omitted in order to avoid redundancies.

In 1 is schematically a light engine 10th or a light generating device shown in a perspective view. The light engine 10th has five sections in this embodiment 12th on which by means of flexible connecting elements 14 are interconnected so that the Lightengine 10th is formed as an essentially pentagonal shape.

The angle between the respective sections 12th is essentially the same so that it can be about 72 °. However, optionally three, four or more than five sections can also be used 12th be provided so that the light engine can have, for example, a triangular, square or polygonal shape. Furthermore, the Lightengine 10th be symmetrical and preferably annular, as in 1 shown.

The light engine 10th still has five areas 16 on which with a respective section 12th flexible by means of connecting elements 14 are connected. The fasteners 14 can for example be made of the same material as the sections 12th and areas 16 be trained. They can have the same or a smaller thickness. In particular, in the case of rigid-flex PCBs, the support structure can be left locally. The light engine 10th is made of a PCB material, so that it can have both a carrier structure and an electrical circuit.

The areas 16 are still inclined relative to each other. In other words, the areas 16 also relative to the sections 12th or compared to the upright arrangement of the sections 12th inclined inward, the areas 16 a passage (not shown) of the light engine 10th on the top of the Lightengine 10th cover at least partially. When the Lightengine 10th the areas are thus inserted into a lamp 16 visible.

The slope of the areas 16 can be chosen flexibly and is preferably in the range between 25 ° and 60 °. Due to the inclination of the areas 16 and connecting the sections 12th a support structure is thus formed which defines a passage (not shown) so that the light engine 10th has a three-dimensional shape.

In the fields 16 are still a light source 18th arranged, for example an LED or an LED chip. This provides a uniform distribution of the emitted or emitted light.

In order to continue to use the existing area efficiently, the areas are tapering 16 to the long end so that they have a substantially triangular or pyramid-like shape. This allows adjacent areas 16 adjoin each other and there may be different inclinations of the areas 16 can be selected without overlapping.

Furthermore, the areas 16 cut or shortened at the respective longitudinal ends so that these have a central opening at the longitudinal ends 20 define. Optionally, the areas 16 in the flexible area or on the connecting element 14 also have a recess so that in this area and between two adjacent areas 16 also an opening 22 provided. This will be through the openings 20 , 22 multiple passageways to the central or inner passageway provided Although this is not in the 1 is shown, the Lightengine 10th continue on one or more sections 12th Have light sources so that the luminous flux can be increased further, and in particular compared to a two-dimensional shape of the light engine 10th is significantly increased without changing the diameter of the light engine 10th is changed. In other words, a compact light engine 10th can be provided with an increased light output.

In 2nd is the light engine 10th according to 1 shown in a perspective sectional view, the light engine 10th is used in a lamp. The lamp has a reflector 24th which is parabolically shaped and has the smallest inside diameter in the lower area. The lamp extends in a longitudinal direction, the inner diameter extending in this direction up to an opening 28 in the upper area or at the upper edge of the reflector 24th enlarged towards. The reflector 24th thus defines a cavity 26 which through the opening 28 is visible from the outside of the lamp.

This is also the light engine 10th which in the lower part of the reflector 24th arranged, visible. Which focus on the areas of the Lightengine 10th Located LEDs or LED chips emit light from the inside of the reflector 24th reflected and out of the lamp through the opening 28 is broadcast. The slope of the areas and the shape of the cavity 26 or the inner surface of the reflector 24th specify the light emission distribution, which continues due to the height of the light engine 10th and the exact placement of the light engine 10th can be further adapted to the desired light properties or light characteristics.

The passage is also in this sectional view 30th the Lightengine 10th visible. The light engine 10th is not only in the lower part of the reflector 24th used, but is also from a base adjacent to the reflector 32 at least partially included. The inclined areas of the light engine 10th however, are completely in the cavity 26 of the reflector 24th arranged. The base 32 has a further cavity or a cavity or receptacle in which, for example, one for the light engine 10th required electrical supply or circuit, for example in the form of a driver.

Through the passage 30th and the one or more optional openings of the light engine 10th thus becomes a passage from the base 32 to the cavity 26 provided.

To the light engine 10th To protect against contamination, the lamp still has a cover 34 which is transparent and therefore translucent. The cover 34 is designed in the present case as a continuous disc which extends from the opening 28 is included and thus the cavity 26 closes. The cover 34 can optionally have a coating, for example a colored coating or anti-reflective coating.

Because the light emission distribution of the emitted light is already due to the arrangement of the light engine 10th and the inclination of the areas is provided, additional optics, for example a beam-shaping lens, can be dispensed with, so that the manufacture of the lamp is simplified.

In 3rd is the light engine 10th shown again from an upper perspective view, the lamp being designed as a spot lamp. The light engine 10th is, although deep in the reflector 24th is inserted through the opening 28 and cover visible, still the inner surface of the reflector 24th is almost completely visible. The three-dimensional design of the light engine accordingly 10th improves the aesthetic effect, which increases the acceptance of, for example, LED-based reflector lamps by the consumer.

In 4th is the lamp according to 3rd shown in a sectional view, the base 32 still has a cavity in which a driver 38 is recorded. Between the cavity and the cavity of the reflector 24th there is also an opening so that the driver 38 into the lower end of the reflector 24th can protrude. So it becomes part of the driver 38 from the Lightengine 10th surround. The driver 38 can, for example, by inserting or plugging in, for example by means of a clamp or a contact spring, with the light engine 10th are electrically connected and can also be connected to the power supply, for example with a pin or electrode at the lower end of the base.

The lower area of the reflector is also corresponding 24th used efficiently and can the Lightengine 10th despite the existing driver 38 deep in the reflector 24th be used.

It is also shown that the areas on which the light sources or LEDs are arranged are located in the cavity of the reflector 24th so that the emitted light hits the inside surface 40 of the reflector 24th radiate. Due to the inclination of the areas and the height of the arrangement of the light engine 10th can thus be specified as the emitted light with the inner surface 40 cooperates to the desired light distribution through the opening 28 to provide the lamp.

An exemplary light emission distribution for an embodiment of the light engine with five sections and five LEDs is shown in FIG 5 shown. In this embodiment, an inclination of the ranges of 45 ° was selected, whereby a beam angle of 33.4 ° is provided, which is in the usual beam angle range of approximately 36 ° with regard to usual tolerances. In this embodiment, a reflector with an approximately parabolic shape was used, the intensity (I; cd) being measured in different planes (L).

With a calculated total luminous flux of 453 Im, an efficiency of 80.5 percent and a maximum intensity of 943 cd were achieved. A total efficiency of 89.2 percent was achieved.

In 6A A light emission distribution is also shown, the lamp in accordance with this embodiment having a light engine with four sections, an LED being additionally arranged on each section, so that the light engine has a total of eight LEDs, as shown below in FIGS 6B and 6C shown. The light engine was used higher in the lower area of the reflector, so that light is emitted from all LEDs on the inner surface of the reflector. In this embodiment, an inclination of the ranges of 55 ° was also selected. In this embodiment, a reflector with an approximately parabolic shape was also used, the intensity (I; cd) being measured in different planes (L).

With a calculated total luminous flux of 664 Im, an efficiency of 72 percent and a maximum intensity of 853 cd were achieved. A total efficiency of 84.7 percent was achieved.

Consequently, the desired light emission distribution and light intensity can be provided both by adjusting the angle of inclination and the number of LEDs or light sources, the light engine still being able to be used deep in the reflector through the support structure or frame structure. This eliminates the need for a lens so that the interior of the reflector is visible. Furthermore, the light engine can be equipped with a higher number of LEDs due to the three-dimensional shape, without the diameter of the light engine or a cooling effect having to be increased.

A corresponding design of the light engine 10th is in 6B shown. The Lightengine points accordingly 10th different openings 20 , 22 on and are the areas 16 with the sections 12th as well as the sections with one another via connecting means 14 connected. Both on the respective sections 12th as well on the areas 16 there are LEDs 18th arranged so that the light engine has a total of 8 LEDs. Incidentally, for reasons of redundancy for the corresponding features on the description in relation to the 1 referred.

The in the 6B shown light engine 10th is in the 6C shown in the inserted condition. This is part of the light engine 10th from the base 32 added so that a driver in the passage 30th the Lightengine 10th protrudes. In comparison to 2nd is the light engine 10th but higher in the longitudinal direction, so that it is correspondingly higher in the cavity 26 of the reflector 24th is used. As a result, both the LEDs arranged on the areas are located 18th as well as the LEDs arranged on the sections 18th itself in the lower area or in the cavity 26 of the reflector, so that an alternative light emission distribution is provided.

The cover 34 is also optionally provided with a coating, which may have a color or anti-reflection coating, for example.

Although the invention has been illustrated and described in more detail by the exemplary embodiments shown, the invention is not restricted thereto and other variations can be derived therefrom by a person skilled in the art without leaving the scope of protection of the invention.

In general, "a", "a" etc. can be understood to mean a singular or a plurality, in particular in the sense of "at least one" or "one or more" etc., as long as this is not explicitly excluded, e.g. with the expression "exactly one" etc.

A number can also include the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

As far as applicable, all individual features that are shown in the exemplary embodiments can be combined with one another and / or exchanged without leaving the scope of the invention.

Reference list

10th

Lightengine

12th

section

14

Lanyard

16

Area

18th

Light source or LED

20

opening

22

opening

24th

reflector

26

cavity

28

opening

30th

Continuity

32

base

34

cover

36

Cooling fin

38

driver

40

Inner surface

Claims (15)

Lamp, comprising: a reflector (24) which extends in a longitudinal direction of the lamp and forms a cavity (26) with an inner diameter which increases in the longitudinal direction up to an opening (28), and a light engine (10) which is arranged in the cavity (26), the light engine (10) having at least three sections (12) which extend in the longitudinal direction and which are laterally flexibly connected to one another, so that the sections (12) form a passage (30), each of the sections (12) at one end inclined towards the opening (28) having a region (16) which is flexibly connected to the respective section (12) and is inclined towards the passage (30) Each area has a light source (18), a light emission distribution from the opening (28) being predetermined by the arrangement of the light engine (10), the inclination of the areas (16) and the reflector (24). A lamp according to the preceding claim, wherein the sections (12) are formed from a carrier material, preferably from PCB material, and wherein the light sources (18) are LEDs or LED chips. Lamp according to one of the preceding claims, wherein the reflector (24) is essentially conical, parabolic, or funnel-shaped, the lamp preferably being a spot lamp. Lamp according to one of the preceding claims, wherein the reflector (24) has a lower end in the region with the smallest inner diameter, the light engine (10) being arranged at the lower end. The lamp according to the preceding claim, wherein the lamp further has a base (32) which is connected to the lower end of the reflector (24), preferably adjoins the reflector (24), the base (32) having a driver (38 ), which is connected to the light engine (10). Lamp according to the preceding claim, wherein the light engine (10) is at least partially accommodated in the base (32), the inclined regions (16) being arranged in the cavity (26) of the reflector (24). Lamp according to one of the preceding claims, wherein the light engine (10) has four or five sections (12) and / or wherein the angle between the sections (12) is the same, wherein the light engine (10) is preferably substantially annular. Lamp according to one of the preceding claims, wherein the angle of inclination between the respective region (16) and the respective section (12) is between 25 ° and 60 °, preferably between 30 ° and 55 °, particularly preferably approximately 45 ° or approximately 55 ° . Lamp according to one of the preceding claims, wherein the regions (16) taper towards the opening (28). Lamp according to the preceding claim, wherein the regions (16) adjoin one another laterally. Lamp according to one of the preceding claims, wherein the regions (16) at the longitudinal ends define a central opening (20). Lamp according to one of the preceding claims, wherein light sources are arranged on one or more sections. Lamp according to one of the preceding claims, wherein the reflector (24) in the region with the smallest inner diameter has a lower opening which at least partially surrounds a driver (38) of the lamp. A lamp as claimed in the preceding claim, wherein the light engine (10) is arranged around the driver (38). Lamp according to one of the preceding claims, wherein the lamp has a translucent cover (34) which at least partially, preferably completely covers the opening (28).

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