Lighting device with a light engine made of a strip

Abstract

Lighting device (1) comprising: - a transparent tube (10) with an inner wall (12) defining a cavity (14); - a light engine (20) having one or more light-emitting diodes (22); and - a driver (30) for driving the light engine (20), characterized in that the light engine (20) is arranged on the inner wall (12) of the transparent tube (10), wherein the light engine (20) is designed as a strip and is aligned along the axial direction of the transparent tube (10), wherein the light engine (20) is flexible, wherein the light engine (20) is designed as a single strip, wherein parts (24) of the strip are arranged on opposite sides of the transparent tube (10), and wherein the opposite strip parts (24) are connected by a central part (26) of the strip, wherein the central part (26) passes through the transparent tube (10) at one end face of the transparent tube (10).

Description

Technical area

[0001] The present invention relates to a lighting device, in particular an LED lighting device suitable for replacing a compact fluorescent lamp. The invention particularly relates to improved thermal properties and improved light output. State of the art

[0002] Conventional fluorescent lamps such as compact fluorescent lamps (CFLs) may not provide sufficient energy efficiency, are generally expensive to manufacture, and must be disposed of safely and properly to avoid compromising personal safety and reduce the risk of environmental pollution.

[0003] Accordingly, it is desirable that such compact fluorescent lamps be permanently replaced by lamps based on safer and more energy-efficient technologies, for example, through the implementation of light-emitting diodes (LEDs). LED-based compact fluorescent lamps at least have the advantage of consuming less energy and eliminating the need to seal and fill the lighting device with a gas. Accordingly, the use of LED-based compact fluorescent lamps is generally considered desirable, especially since this reduces energy costs and both production and disposal are safer and less complicated.

[0004] However, conventional LED-based compact fluorescent lamps generate significant amounts of heat, so they typically require a heat sink to dissipate the heat to the surroundings. Such heat sinks are typically manufactured using extrusion processes and implement an extruded aluminum profile as the heat sink. The size of such heat sinks is usually considerable, so this not only increases the weight and cost of the lamp but also limits the sizing and design of the lamp. Furthermore, the heat sink can adversely affect other factors, such as light output, which is undesirable.

[0005] Accordingly, there is a need to replace conventional compact fluorescent lamps with lamps with better thermal properties without reducing the light output and which are suitable for a cost-effective manufacturing process, for example, enabling simple and inexpensive production.

[0006] The document DE 20 2018 105 898 U1 describes a lighting device with an elongated housing and with a light engine comprising a leadframe, wherein the housing has a clamping device for holding the light engine. The document DE 20 2015 006 503 U1 describes an LED tubular lamp with a lamp tube and an end cap attached to one end of the lamp tube, which end cap comprises a tubular insulation and a magnetic element arranged between an inner circumferential surface of the tubular insulation and one end of the lamp tube. The document DE 10 2015 205 030 A1 describes a semiconductor lamp having a rectilinear, translucent tube, the open end surfaces of which can be closed by means of respective end caps, wherein the end caps are plugged together with the tube.The document DE 10 2009 023 052 A1 describes a lighting module with a flexible, ribbon-shaped support for multiple heat sources, including light sources, wherein the support is designed to be bent over at least part of its width. The document US 2016 / 0 245 462 A1 describes a linear LED lamp with an elongated housing and a heat sink integrated into the housing. The document US 2015 / 0 285 472 A1 comprises a translucent tube in which a spirally wound, elastic support structure with lighting elements is attached directly inside the tube. The document US 2009 / 0 161 359 A1 describes a retrofit fluorescent tube model with LEDs, comprising internal optical structures with reflective surfaces or light guides for generating a uniform light distribution. Description of the invention

[0007] Based on the known prior art, it is an object of the present invention to provide a simplified light engine arrangement and improved cooling of the light engine with improved light output.

[0008] This object is achieved by a lighting device according to the independent claim. Advantageous further developments emerge from the subclaims.

[0009] According to a first aspect of the invention, a lighting device is provided which comprises a transparent tube having an inner wall defining a cavity, a light engine having one or more light-emitting diodes and a driver for driving the light engine, wherein the light engine is arranged on the inner wall of the transparent tube.

[0010] The arrangement of the light engine and one or more LEDs on the inner wall of the tube has at least the advantage of not only achieving improved lighting properties, but also simultaneously providing a cooling surface for the light engine to conduct heat. Accordingly, the thermal performance of the lighting device is improved by the fact that heat can be transferred directly from the light engine to the tube, so that an additional heat sink is no longer required or can at least be smaller or designed to be smaller.

[0011] The light engine of the lighting device is designed as a strip and aligned along the axial direction of the transparent tube.

[0012] The axial direction of the tube is understood to be a direction that extends essentially from a socket or in a longitudinal direction of the lighting device. Such an axial direction coincides with the axis of the tube when the tube is linearly extended.

[0013] A strip shape of the light engine has at least the advantage that the light engine can be dimensioned thinly in a radial direction of the tube, thus enabling a narrow and simple design. The light engine can thus be easily placed and attached to the inner wall. Furthermore, such a shape has the advantage of facilitating the manufacture of the lighting device, for example, by facilitating insertion, assembly, and fastening, while simultaneously reducing manufacturing costs, for example, through simple production and lower material costs.

[0014] The light engine may also comprise a plurality of separate strips that are placed adjacent to one another, spaced apart from one another, and / or on opposite sides of the inner wall of the transparent tube and facing one another. Providing a plurality of strips allows the light output to be selectively adjusted. In other words, the light emitted by the lighting device may be either more concentrated in one direction, for example, when two or more strips are placed adjacent to one another or side by side, or it may be less concentrated but emit more light on one side of the lighting device, for example, when two or more strips are spaced apart from one another on the inner wall.Furthermore, providing two or more opposing stripes on opposite sides of the inner wall of the transparent tube can provide omnidirectional light, for example, light emitted more homogeneously in all directions. Depending on the preferred intensity or homogeneity, the lighting device can have two or even more stripes, for example, 3, 4, 5, or more.

[0015] The light engine is designed to be flexible. A flexible light engine has at least the advantage that it can be easily inserted into the lighting device during production. Furthermore, this flexibility allows the light engine to be adapted to a variety of surfaces, e.g., curved or bent surfaces, or even angular or smooth corners. A flexible light engine can also be provided as a strip, whereby the thin or small dimensions of the strip shape, together with the flexibility, provide a light engine that can be adapted to the surface of the interior wall and thus allows a wide range of selection or freedom of selection in the shape of the lighting device. Furthermore, this facilitates the possibility of easy insertion and the provision of a more robust light engine, i.e.A light engine that is less susceptible to breakage or impairment of the electrical contacts, the production of such a lamp.

[0016] Furthermore, the flexibility of the light engine allows for curvature or bending of the light engine, so that instead of using a plurality of strips for different areas of the inner wall of the tube, the light engine can, for example, be extended to provide a light engine in the areas.

[0017] The light engine is designed as a single strip, with sections of the strip arranged on opposite sides of the transparent tube. The opposing strip sections can thus face each other or be aligned with each other, or they can be arranged on the inner wall at opposite locations consistent with the diameter of the cavity. A single strip has the advantage of requiring only one connecting link and also provides improved thermal cooling properties.

[0018] The strip is arranged entirely on the inner wall. However, a portion of the strip that does not correspond to the opposing strip portions may be placed adjacent to the inner wall of the pipe without being attached. Such a strip portion may thus have a substantially straight, convex, or concave shape, or may also form a U-shape, an inverted U-shape, or a Z-shape.

[0019] The opposing or opposite strip parts are connected by a central part of the strip, wherein the central part passes through the transparent tube at one end face of the transparent tube. Accordingly, the central part can pass through a cross-section of the tube in a direction substantially perpendicular to the axial direction of the opposing strip parts. The central part can be arranged on the inner wall or can be held by the ends of the opposing strip parts, which extend into or are adjacent to the central part. Although an edge or corner can be formed between the strip parts, a curvature is preferably provided between the central part and each opposing strip part.Such a curvature can, for example, reduce the tensile force acting on the respective strip parts, while providing sufficient structural stability to prevent the central strip part from collapsing.

[0020] By providing a light engine as a flexible single strip with opposing strip sections, it is possible to emit light in virtually all directions without interruption or obscuration by other components, such as a mechanical mount, cooling system, or electrical components. Accordingly, the strip provides omnidirectional light.

[0021] To provide flexibility of the light engine, the light engine can have a flexible printed circuit board (PCB) or other components such as a CAM1, FR4, or MCPCB.

[0022] Although the center section can be located at either end of the tube, the center section preferentially emits light and can thus be adapted to one end of the light tube. Accordingly, the center section is preferably located at an end of the transparent tube opposite the driver. This has at least the advantage of providing better light output while simultaneously improving cooling of the light engine by providing direct heat dissipation from the center section to the inner wall, which cannot be provided if the center section is located near the driver components.

[0023] To further facilitate the manufacture of the lighting device and further improve cooling of the light engine, the light engine can be attached to the inner wall of the transparent tube using a heat-activated adhesive, a light-activated adhesive, a pressure-activated adhesive, or a multi-component adhesive. For sensitive materials, a heat-activated adhesive may be preferred. Using an adhesive eliminates the need for screws or other mechanical fastenings, and pre-drilling or other preparation steps are no longer required. Furthermore, an adhesive can be easily applied and allows the tube to be rotated and twisted during the manufacturing process. The adhesive cures, for example, using thermal energy, allowing the light engine to be quickly attached to the inner wall.Furthermore, the use of an adhesive provides a mounting surface that is adapted to both the inner wall and the light engine, so that the heat can be efficiently conducted or dissipated through the surface from the light engine to the inner wall.

[0024] The transparent tube of the lighting device can further be formed from a glass material or plastic material, wherein the glass is transparent, coated, or translucent. The use of glass or a solid or crystallized plastic can provide desired optical properties. At the same time, glass can provide desired thermal conductivity and cooling properties for the light engine arranged on the inner wall. Furthermore, a glass material can also provide sufficient heat resistance if a larger number of light-emitting diodes and / or higher-power LEDs are implemented in the light engine. Although a glass material may be preferred, a plastic material with similar material properties can also be used, for example, if extrusion processes or injection molding processes are implemented for the production of the tube.

[0025] Depending on the light to be emitted, the glass or plastic material can be either completely transparent or at least partially coated or translucent. For example, the tube can be translucent to provide diffused or dispersed light. Alternatively, or additionally, the tube can have a coating, for example, to provide a variety of color schemes.

[0026] The transparent tube may further include an opening at one end and an end cap closing the opening and the cavity of the transparent tube, the end cap being secured to the transparent tube by an adhesive. For example, the tube may include an opening on one side only, with the end cap being secured to the opening of the tube, such that the end cap closes the tube of the lighting device. The end cap may be configured and dimensioned to surround the opening and the tube at that end of the tube, such that the end cap is placed over the tube and extends along the outside of the tube at the end region.

[0027] The shape of the tube and end cap of the lighting device may correspond to a compact fluorescent lamp. Accordingly, the lighting device may be designed and dimensioned to fit within a socket or base of a housing of a compact fluorescent lamp. For example, the lighting device may include a mechanical connector on the end cap that is received by a corresponding socket, and may include electrical connections connected to the driver and extending from the end cap that contact the electrical connectors of the socket to provide electrical power to the driver when the lighting device is received by a socket.

[0028] The driver can be arranged in the transparent tube of the lighting device or at least partially accommodated therein. Accordingly, the driver of the lighting device can be arranged in the cavity of the transparent tube. The driver is oriented in a direction substantially perpendicular to the light engine. For example, the driver can be mounted horizontally at least partially in the cavity of the tube when the axial direction of the transparent tube is oriented in a vertical direction. In other words, the driver can be located at one end of the tube and in a substantially planar arrangement with respect to the cross-section of the end region of the tube. The fact that the driver is only arranged at one end of the tube has at least the advantage that the light output is not impaired by the driver.

[0029] Alternatively, the driver can be arranged in or extend into the cavity of the transparent tube, wherein the driver is aligned in a substantially longitudinal direction of the transparent tube. In other words, the driver can be placed parallel to the axial direction of the transparent tube. For example, a first region of the driver can be arranged partially within the tube, wherein a second region protrudes or extends from the tube and is accommodated, for example, within an end cap of the lighting device. Accordingly, only part of the driver can be located within the tube, with the other part not being arranged within the tube. This has at least the advantage that the light output is not impaired by the driver.

[0030] To electrically connect the light engine to the driver, the driver can have at least one wire, a connector, or a metal spring connector or contact spring arranged on an edge of the driver. For example, a wire can be used to electrically connect the light engine to the driver. However, a connecting element can also be provided, for example a plug / socket connection or by providing a snap connection. Alternatively, a metal spring connector can be provided, which at least has the advantage that no further fastening components or method steps are required, but instead is simply arranged between the driver and the light engine to provide an electrically conductive connection.

[0031] The metal spring connector is preferably configured to also provide a mechanical fastening that secures the driver to the transparent tube. For example, the spring may be configured to form an assembly with a press fit, such that the driver is secured in the tube by means of a compressive force. Alternatively, or additionally, the spring may comprise positive-locking elements, such that when the driver comprising the metal spring connector is inserted into the tube, the spring and the driver are secured in the tube when the spring contacts a corresponding, predetermined element in the tube, for example a projection, a rib, or a detent. This has at least the advantage that manufacturing is facilitated or simplified and no further fastening elements, e.g.Requires no drilling, screws, or other mechanical fasteners, and the driver can be secured simply by inserting the driver into the corresponding metal spring connector. The metal spring connector can either be continuous along a perimeter of the driver or comprise a plurality of metal spring connectors adapted to the number of connections required by the light engine.

[0032] The driver can further be designed and dimensioned such that it corresponds to the shape of the tube. Accordingly, the transparent tube of the lighting device can have a tubular shape and the driver can have a circular shape, wherein the driver has a circumference which corresponds to the cross-sectional circumference defined by the inner wall of the transparent tube. Accordingly, the driver can be positioned or arranged adjacent to the inner wall of the tube, wherein a certain tolerance range can be provided. This has at least the advantage that the area of ​​the circuit board can be optimized in order to enable optimal distribution of the corresponding components and / or to provide optimal heat dissipation from the corresponding components to the inner wall. The inner wall of the tube can further have projections such that the driver can be received or mounted on a corresponding element of the inner wall.can be supported by it. Short description of the characters

[0033] Preferred further embodiments of the invention are explained in more detail in the following description of the figures. In the figures: Fig. 1A is a perspective view of a lighting device with a transparent tube and a light engine; Fig. 1B is a longitudinal section view of a lighting device as shown in Fig. 1a shown; Fig. 2A is a perspective view of a transparent tube with a light engine formed as a strip; Fig. 2B is a perspective view of a transparent tube with a light engine formed as two spaced-apart strips; Fig. 2C is a perspective view of a transparent tube with a light engine formed as two strips placed adjacent to each other; Fig. 2D a perspective view of a transparent tube with a light engine formed as two opposing strips; Fig. 3 a perspective view of a transparent tube with a light engine, which is designed as a flexible single strip; Fig. 4A is a cross-sectional view of an end cap at an opening of the tube having a driver with connectors; and Fig. 4B is a longitudinal sectional view of a lighting device with an end cap at an opening of the tube, which has a driver with connectors. Detailed description of preferred embodiments

[0034] Preferred embodiments of the invention 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 to avoid redundancies.

[0035] In Fig. 1A shows a perspective view of a lighting device 1 with a transparent tube 10 and a light engine 20. The lighting device has an end cap 40 which is attached to the transparent tube 10 by means of a heat-activatable adhesive. The end cap 40 provides a connecting element 44 and contact pins 42 to provide a mechanical attachment or an electrically conductive connection when received by a corresponding socket. The transparent tube 10 has an inner wall 12 which defines a cavity 14 of the transparent tube 10. A light engine 20 is arranged in the cavity 14, the light engine 20 having a plurality of LEDs 22.

[0036] According to the embodiment, the light engine 20 comprises two strips, wherein the strips are arranged on the inner wall of the transparent tube 10 and placed adjacent to each other. The strips are attached to the inner wall 12 by means of a heat-activatable adhesive and extend in an axial direction of the transparent tube 10, i.e., in a longitudinal direction or a direction extending from the end cap 40.

[0037] The transparent tube 10 is shown with a tubular shape and can thus correspond to the shape of a compact fluorescent lamp. Furthermore, both the connecting element 44 and the contact pins 42 can be configured to be received by a socket suitable for a compact fluorescent lamp (CFL). Accordingly, the lighting device 1 is configured for replacing or exchanging a compact fluorescent lamp.

[0038] The light engine 20 is connected to a driver 30, which is only partially shown. The connection between the light engine 20 and the driver 30 is provided by an electrically conductive wire. Similarly, the contact pins 42 are connected to the driver by means of a wire that is soldered to the circuit board of the wire or held by similar means and is electrically conductively connected. The driver 30 is accordingly configured to drive the light engine 20 when the contact pins 42 are connected to corresponding electrical elements, for example, a socket.

[0039] Fig. 1B shows a lighting device 1 according to Fig. 1A in a longitudinal section view. Furthermore, the driver and its components are shown in more detail. The driver is oriented in a direction parallel to the longitudinal or axial direction of the transparent tube 10. Furthermore, a large part of the driver 30 is accommodated in the end cap 40 and the connecting element 44 of the end cap 40. Accordingly, the space required for the driver 30 is minimized. Only a part of the driver 30 extends into the transparent tube 10, with this part forming the electrical connection between the driver 30 and the light engine 20. Accordingly, the light emitted by the LEDs 22 arranged in the transparent tube 10 is not affected or interrupted by the provided driver 30.

[0040] A perspective view of a transparent tube 10 with a light engine 20, which is designed as a strip, is shown in more detail in Fig. 2A. The inner wall 12 of the transparent tube defines a cavity 14. Furthermore, the transparent tube 10 has an opening 16 at one end, which is configured, for example, to receive an end cap and a driver. The strip is arranged on the inner wall 12 in a longitudinal or axial direction of the transparent tube 10, similar to the Fig. 1A and Fig. 1B. The LEDs 22 preferably have a continuous or constant spacing between them to emit a homogeneous light. However, other arrangements may be provided.

[0041] A corresponding embodiment with two stripes is shown in Fig. 2B. The light engine 20, which has the LEDs, can thus be viewed as a single light engine 20 comprising two strips or as two light engines 20, each formed as a strip. The strips extend, as shown, through the entire cavity 14, starting from the opening 16 to the other end of the transparent tube 10. However, the strip can also be shorter or smaller in size, so that the strip does not extend to the other end of the transparent tube 10. Accordingly, the strips are also arranged on the inner wall 12 of the transparent tube 10. According to the embodiment of the Fig. In Figure 2B, the stripes are spaced apart. Although the stripes are shown spaced approximately one-fifth of a turn apart, the spacing can be smaller or larger, depending on the desired focus and radius of the emitted light.

[0042] For example, the strips or light engines can be 20, as in Fig. 2C, be placed adjacent to each other on the inner wall 12 of the transparent tube 10, for example, to provide light in a specific direction. Although the light from the LEDs 22 is emitted in all directions, the light is substantially concentrated in the area where the strips are arranged. Such a strip arrangement may be suitable, for example, for reading lamps or lamps with a predetermined aperture or a predetermined light-emitting area. The cavity 14 may further be dimensioned according to the heat generated by the light engine 20. Accordingly, a smaller cavity 14 may be provided for low-light needs, and the cavity may be larger if high light output is required or the heat generated by the adjacent light engines 20 requires a large conducting or cooling surface.

[0043] Fig. 2D a perspective view of a transparent tube with a light engine formed as two opposing strips;

[0044] Alternatively, the strips or light engines 20 can be placed further apart from each other, as in Fig. 2D. Accordingly, the strips are arranged substantially on opposite sides of the transparent tube 10 on the inner wall 12. Accordingly, the strips can provide omnidirectional light. Although only two strips are shown, the transparent tube 10 can be configured to include more than two strips for fine-tuning the illumination or to provide more or stronger omnidirectional light.

[0045] Fig. 3 shows a perspective view of an alternative embodiment of a light engine 20, which is designed as a single strip. As shown in the other figures, the light engine 20 has a plurality of LEDs. According to this embodiment, the light engine 20 is flexible, for example, by providing a flexible circuit board. Accordingly, a light engine 20 is provided as an elongated strip, with one part of the strip being arranged on the inner wall 12 of one side of the transparent tube 10 and another part of the strip being arranged on the inner wall on an opposite side of the transparent tube 10, so that two opposing strip parts 24 are formed. The opposing strip parts 24 are connected to one another by a central part 26, which passes through the cavity 14 at an end of the transparent tube 10 opposite the opening 16 and / or the driver.The central portion 24 can be arranged at the end on the inner wall 12 or simply held by the opposing strip portions. The central portion can further include LEDs for emitting light in an axial direction from the end of the transparent tube 10. Alternatively, the central portion 26 can simply form an electrical and / or mechanical connection portion between the opposing strip portions 24.

[0046] In Fig. Figure 4A shows a cross-sectional view of an end cap 40 at an opening of the transparent tube, which end cap includes a driver with connectors. As shown, the driver 30 is further positioned in a direction parallel to the axial direction of the tube. Accordingly, the driver 30 is in a vertical position when the lighting device is oriented in an upright position. The driver 30 is electrically connected to the light engines 20 by means of two metal spring connectors 32. Accordingly, the metal spring connectors 32 are disposed at the edges of the driver 30 or the driver's circuit board and engage the light engines 20 to form an electrical connection.Furthermore, the metal spring connectors may be configured and dimensioned to provide mechanical stability of the driver 30 or even to hold or fix or fasten the driver 30 within the end cap 40 of the transparent tube.

[0047] An alternative orientation of the driver 30 is shown in Fig.4B. The lighting device 1 is shown in longitudinal section with an end cap at an opening of the tube, which end cap has a driver 30 with metal spring connectors or contact springs 32. The metal spring connectors 32 provide an electrical connection between the driver 30 and the light engine 20. The light engine 20 is shown as a flexible single strip having two opposing strip parts 24 arranged on the inner wall 12 and a central part 26 at an end of the transparent tube 10 opposite the driver 30. The central part 26 passes through the cavity of the transparent tube 10 and is placed adjacent to the inner wall at the end of the transparent tube 10 opposite the driver 30. The driver 30 is connected to the contact pins 42 and forms an electrically conductive connection between the contact pins 42 and the light engine 20 by means of the metal spring connectors 32.Preferably, the metal spring connectors 32 also provide mechanical stability or support for the driver 30 in the transparent tube 10.

[0048] The driver 30 is placed in the transparent tube 10 in a substantially horizontal plane, with the lighting device 1 being considered to be in an upright and vertical position or orientation. Accordingly, the driver is oriented in a direction perpendicular to the axial direction of the transparent tube 10 and the axial direction of the light engine 20. Furthermore, the driver 30 is dimensioned to conform to the tubular shape of the transparent tube 10 by having a substantially circular shape and a circumference that coincides with the cross-sectional circumference defined by the inner wall of the transparent tube 10.This has at least the advantage that the driver is completely held and accommodated in the transparent tube 10, so that the number of electrical components in the end cap can be minimized, thereby facilitating the manufacture of the lighting device 1 and making the electrical components which are otherwise housed within the end cap 40 of the lighting device less susceptible to damage.

[0049] Although the invention has been illustrated and described in detail by the embodiments shown, the invention is not limited thereto and other variations can be derived therefrom by a person skilled in the art without departing from the scope of the invention.

[0050] In general, “a”, “an”, etc. can be understood as a singular or a plural, in particular in the sense of “at least one” or “one or more”, etc., unless this is explicitly excluded, e.g. by the expression “exactly one”, etc.

[0051] A numerical value may also include the exact number stated as well as a usual tolerance range, as long as this is not explicitly excluded.

[0052] Where applicable, all individual features presented in the embodiments may be combined and / or exchanged without departing from the scope of the invention. List of reference symbols 1 lighting device 10 transparent tube 12 interior wall 14 Cavity 16 Opening 20 Light Engine 22 light-emitting diode or LED 24 Opposite strip part 26 Middle section 30 drivers 32 metal spring connectors or contact springs 40 end cap 42 contact pin 44 Connecting element

Claims

[1] comprising a lighting device (1): - a transparent tube (10) with an inner wall (12) which defines a cavity (14); - a light engine (20) comprising one or more light-emitting diodes (22); and - a driver (30) to drive the light engine (20), characterized by, that the Light-Engine (20) is arranged on the inner wall (12) of the transparent tube (10), wherein the Light-Engine (20) is designed as a strip and is aligned along the axial direction of the transparent tube (10), wherein the Light-Engine (20) is flexible, wherein the Light-Engine (20) is designed as a single strip, wherein parts (24) of the strip are arranged on opposite sides of the transparent tube (10), and wherein the opposite strip parts (24) are connected by a central part (26) of the strip, wherein the central part (26) passes through the transparent tube (10) at an end face of the transparent tube (10). [2] Lighting device (1) according to claim 1, wherein the central part (26) is arranged at an end of the transparent tube (10) opposite the driver (30). [3] Lighting device (1) according to one of the preceding claims, wherein the light engine (20) is attached to the inner wall (12) of the transparent tube (10) by a heat-activated adhesive, a light-activated adhesive, a pressure-activated adhesive, or a multi-component adhesive. [4] Lighting device (1) according to one of the preceding claims, wherein the transparent tube (10) is formed from a glass material or plastic material, wherein the glass is transparent, coated or translucent. [5] Lighting device (1) according to one of the preceding claims, wherein the transparent tube (10) has an opening (16) at one end and has an end cap (40) which closes the opening (16) and the cavity (14) of the transparent tube (10), wherein the end cap (40) is attached to the transparent tube (10) by an adhesive. [6] Lighting device (1) according to one of the preceding claims, wherein the driver (30) is arranged in the cavity (14) of the transparent tube (10) and is oriented in a direction substantially perpendicular to the light engine (20), or wherein the driver (30) is arranged in or extends into the cavity (14) of the transparent tube (10) and is oriented in a substantially longitudinal direction of the transparent tube (10). [7] Lighting device (1) according to one of the preceding claims, wherein the driver (30) is electrically connected to the light engine (20) by means of at least one wire, connector or metal spring connector (32) which is arranged on an edge of the driver (30). [8] Lighting device (1) according to claim 7, wherein the metal spring connector (32) is configured to provide a mechanical fastening which secures the driver (30) to the transparent tube (10). [9] Lighting device (1) according to one of the preceding claims, wherein the transparent tube (10) has a tubular shape and wherein the driver (30) has a circular shape, wherein the driver (30) has a circumference which corresponds to the cross-sectional circumference defined by the inner wall (12) of the transparent tube (10).

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