Centering ring

Abstract

Centering ring (14) for a lighting assembly (10) of an automotive luminaire, comprising: a centering sleeve (30) having an opening (24) configured to receive a lighting element (11), a first end (32) and an opposite second end (34), a centering plate (28) connected to the first end (32) of the centering sleeve (30) and configured to be received by a lamp socket of the automotive luminaire, and at least one first snap-fit feature (38) arranged at the second end (34) of the centering ring (14) to engage a corresponding snap-fit feature (40) at the lighting element (11) when received in the centering sleeve (30).

Description

[0001] The present invention relates to a centering ring for a lighting assembly in particular of an automotive luminaire. Further, the present invention relates to a lighting assembly in particular for an automotive luminaire comprising such a centering ring.

[0002] With the advent of light emitting diodes (LED) as powerful and efficient light source, a need existed to replace conventional incandescent bulbs in automo-tives with the LEDs. However, LEDs in the power range necessary to be used in automotive luminaire do not only require a specific driver but also an improved cooling such that overheating of the LEDs is prevented. Therein, both must be included into a lighting assembly if the lighting assembly shall be used as retrofit in order to replace conventional incandescent bulbs of automotive luminaire. Therein, it has been shown, that driver and / or heat sink require too much space to be inserted into the area of the reflector of the automotive luminaire but may extend to the outside which has been proven to be beneficial in terms of cooling.

[0003] For a correct illumination it is important that the light emitting elements, i.e. LEDs, are placed at a distinct position within the reflector of the automotive luminaire. Consequently, already for the incandescent bulbs centering rings have been established as for example H3 or H1 sockets, wherein by the sockets the orientation as well as the position of the bulb within the reflector is fixed. Therein, for conventional incandescent bulbs, the centering ring is integrated and built as one piece with the hub of the incandescent bulb itself.

[0004] In order to be able to replace the conventional incandescent bulbs with retrofit LED light assemblies, a lighting element including the LED, the driver and the heat sink, and the centering ring and are separated such that first the centering ring is inserted into its position in the socket of the automotive luminaire assembly and subsequently the lighting element is inserted into the centering ring and hold in place by the centering ring. Therein, it is crucial to fix and maintain the position of the lighting element within the centering ring with high reliability despite vibration and shocks. In addition, the connection between centering ring and lighting element must be releasable in order to remove the lighting assembly again from the automotive luminaire.

[0005] It is an object of the present invention to provide a centering ring for a lighting assembly of an automotive luminaire providing reliable positioning of a lighting element with high accuracy.

[0006] The problem is solved by a centering ring according to claim 1 and a lighting assembly according to claim 8.

[0007] According to the present invention a centering ring for a light assembly of an automotive luminaire is provided. The centering ring comprises a centering sleeve having an opening configured to receive a lighting element. Further, the centering sleeve has a first end and an opposite second end. Therein, first end and second end are arranged along the axial direction of the centering sleeve. A centering plate is connected to the first end of the centering sleeve and configured to be received by a lamp socket of the automotive luminaire. Therein, the centering plate may be adapted to fit precisely into the lamp socket of the automotive luminaire such that the position of the centering ring relative to the lamp socket of the automotive luminaire is determined by the position of the centering plate. Therein, the centering plate may provide a form fit with the lamp socket of the automotive luminaire to define the position of the centering ring. Further, the centering ring comprises at least one first snap fit feature arranged at the second end of the centering sleeve to engage a corresponding snap fit feature at the lighting element when received in the centering sleeve.

[0008] Thus, the connection between the lighting element and the centering ring is provided by a snap fit connection between the first snap fit feature and a corresponding snap fit feature of the lighting element. Therein, by the centering sleeve centering of the lighting element and axial positioning of the lighting element is provided. Further, by the snap fit connection between the centering ring and the lighting element a relative orientation between the centering ring and the lighting element is established due to the corresponding position of the respective snap fit features and, in addition, a releasable connection is provided which can be engaged in order to assemble the lighting element into the centering ring and which can be released in order to remove the lighting element from the centering ring. By the snap fit connection between the centering ring and the lighting element a defined position is provided that is shock resistant and withstands vibration over a long period of time. Hence, by the centering ring due to the combination of the positioning of the centering sleeve and the snap fit connection, a reliable position of the lighting element is provided.

[0009] Preferably, the first snap fit feature is built as detent or keyway. Thus, by the detent in one configuration or the keyway in another configuration a reliable snap fit connection is enabled. If the centering ring comprises more than one first snap fit feature, all first snap fit features can be built identically, i. e. all first snap fit features are built as detent or all as keyway, or at least two first snap fit features can be built differently, i. e. one as detent and at least one as keyway. However, the present invention is not limited to a specific shape of the first snap fit feature as long as a releasable locking mechanism by an interference fit or interlocking means are provided.

[0010] Preferably, the first snap fit feature is built as annular snap fit in order to interlock with the corresponding snap fit feature of the lighting element by a hoop strain.

[0011] Preferably, the opening of the centering sleeve has an elliptic or oval shape. By the elliptic or oval shape already the orientation between the lighting element and the centering sleeve is determined, supporting the orientation functionality of the snap fit connection such that the snap features of the centering ring and the lighting element can be force free, in particular with respect to a rotational force, maintain the orientational position. In particular, by the elliptical oval shape corners can be prevented and a cross sectional area can be maximized such that heat can be efficiently conducted from the light emitting element of the lighting element towards a heat sink.

[0012] Preferably, the centering plate comprises at least one keying feature preferably arranged at the perimeter of the centering plate. By the keying feature an orientation of the centering ring relative to the lamp socket of the automotive luminaire is determined. In particular, the keying feature may comprise one or two indentations of the centering plate providing a form fit with a respective shape of the lamp socket of the automotive luminaire.

[0013] Preferably, the centering plate has two identical keying features arranged in an angular distance to each other. In particular, the angular distance may be 45° or 90° or another specific degree to each other. Consequently, the lighting assembly can be assembled in two different positions to the lamp socket of the automotive luminaire, wherein the two different positions may differ by a rotation of 90° or other specific degree to each other. Hence, if the lighting element has distinct illumination direction, this illumination direction can be adjusted to the specific lamp sockets.

[0014] Preferably, the keying feature corresponds to a H3 or H1 lamp socket such that the centering ring can be inserted into existing H3 or H1 lamp sockets.

[0015] Preferably, the centering sleeve comprises an inner surface, wherein at least one groove and preferably two grooves are arranged at the inner surface configured to receive an elastomeric O-ring. Therein, if two grooves are arranged at the inner surface of the centering sleeve, each groove comprises an elastomeric O-ring. By the elastomeric O-ring arranged at the inner surface of the centering sleeve a frictional connection between the centering ring and the lighting element is established. Due to the resilient elastomeric O-ring vibrations may be damped and not transferred to the lighting element. In particular, by the two grooves including the two elastomeric O-rings a reliable centering of the lighting element within the centering sleeve is achieved. In particular, if the opening of the centering sleeve and correspondingly the first section of the lighting element elliptical or oval, (sharp) edges that could damage the O-ring are prevented and a homogenous pressure distribution along the full perimeter can be achieved. At the same time slipping of the O-ring out of the grooves can be prevented.

[0016] Preferably, the centering sleeve and the centering plate are built as one piece.

[0017] Preferably, the centering sleeve and / or the centering plate is made from a thermoplastic such as PA66 or PPS. Thus, if the centering sleeve is made from a thermoplastic, it may comprise intrinsically elasticity such that the first snap fit feature may be built as keyway or recess in order to establish an annular snap fit exploiting the intrinsic elasticity of the centering sleeve.

[0018] In another aspect of the present invention a lighting assembly in particular for an automotive luminaire is provided. The lighting assembly comprises a centering ring as described before. Further, the lighting assembly comprises a lighting element received in the centering sleeve of the centering ring, wherein the lighting element comprises at least one second snap fit feature configured to engage with the first snap fit feature of the centering ring when the lighting element is received in the centering collar. Thus, the second snap fit feature may have a corresponding shape in order to establish a snap fit connection between the first snap fit feature and the second snap fit feature. Therein, in particular, the first snap fit feature is engaged with the second snap fit feature if the lighting element is fully received in the centering sleeve. Thus, by the combination of the centering sleeve providing a centering of the lighting element and the snap fit connection between the centering ring and the lighting element reliable positioning of the lighting element relative to the centering ring is provided.

[0019] Preferably, the second snap fit feature is shaped as detent or keyway in correspondence with the first snap fit feature. Correspondingly, if the first snap fit feature is shaped as detent, the second snap fit feature is shaped as keyway and vice versa, such that engagement of the first snap fit feature and the second snap fit feature is possible.

[0020] Preferably, the lighting element provides more than one second snap fit feature. In particular, the number of second snap fit features corresponds to the number of first snap fit features such that each first snap fit feature engages with a corresponding second snap fit feature. Therein, as described before with respect to the first snap fit features, also the second snap fit features can be built identically or differently. Alternatively, there may be more second snap fit features than first snap fit features or the other way around in order to provide more than one possibility to arrange the lighting element relative to the centering ring. Thereby, different positions of the lighting element with respect to the centering ring becomes feasible to adjust the rotational position of the lighting element within the centering ring and still providing in all allowable positions a snap fit connection between the lighting element and the centering ring.

[0021] Preferably, the lighting element comprises a first end and an opposite second end. At the first end the lighting element may comprise at least one LED and in particular, a plurality of LEDs. Further, at the second end of the lighting element a heat sink is arranged, wherein the heat sink and / or the lighting element is at least partially received in the centering sleeve. Thus, when assembling the lighting element into the centering ring, the first end is inserted into the opening of the centering sleeve and slid through the centering sleeve until the first snap fit features and the second snap fit feature engage with each other. In this position, the first end may extend into a reflector of the automotive luminaire in a preset and required position with high accuracy.

[0022] Preferably, the second snap fit feature is integrally formed with the heat sink. In particular, the heat sink may be made from a metal such as aluminum.

[0023] Preferably, the second snap fit feature is made from metal such as aluminum. In the case of the second snap fit feature being integrally formed with the heat sink both are made from the same metal such as aluminum. If the second snap fit feature is made of metal such as aluminum, it may preferably be shaped as detent to be received by a keyway as first snap fit feature. Therein, the metal has a sufficient rigidity to apply a respective hoop strain on the keyway of the centering sleeve which is preferably made from a thermoplastic.

[0024] Preferably, the lighting element comprises a first section having a substantially corresponding shape to the shape of the opening of the centering sleeve and a second section, wherein the first section is at least partially and preferably completely received by the centering sleeve. Hence, a form fit between the first section of the lighting element and the centering sleeve is provided, providing positioning of the lighting element within the centering ring with high accuracy. In particular, the first section and the second section are defined by the heat sink, i. e. form part of the heat sink.

[0025] Preferably, the first section has an oval or elliptic cross-section corresponding to the oval or elliptic shape of the opening of the centering sleeve. By the elliptic or oval shape already the orientation between the lighting element and the centering sleeve is determined, supporting the orientation functionality of the snap fit connection such that the snap features of the centering ring and the lighting element can be force free, in particular with respect to a rotational force, maintain the orientational position. In particular, by the elliptical oval shape corners can be prevented and a cross sectional area can be maximized such that heat can be efficiently conducted from the light emitting element of the lighting element towards a heat sink.

[0026] Preferably, between the first section and the second section a contact surface is arranged, wherein the second end of the centering sleeve abuts against the contact surface when the lighting element is fully received by the centering sleeve. Hence, the contact surface supports positioning of the lighting element in the centering ring by limiting axial movement of the lighting element when the lighting element is inserted into the centering sleeve of the centering ring.

[0027] In particular, the second snap fit feature is arranged at the contact surface and may extend towards the first end of the lighting element, i. e. in the direction of movement of the lighting element during insertion of the lighting element into the centering ring. Hence, snap fit connection between the lighting element and the centering ring is established together and at the same time with insertion of the lighting element into the centering ring. No additional steps are necessary in order to fix the lighting element by the snap fit connection into the centering ring.

[0028] Preferably, the first section comprises at least one groove and preferably two grooves. An elastomeric O-ring is arranged in the at least one groove and preferably in each of the two grooves, wherein the O-ring come into contact with an inner surface of the centering sleeve to position the lighting element with the centering ring. Hence, by the O-rings a friction fit is created between the lighting element and the centering ring. Due to the resilient elastomeric O-ring vibrations may be damped and not transferred to the lighting element. In particular, by the two grooves including the two elastomeric O-rings a reliable centering of the lighting element within the centering sleeve is achieved. In particular, if the opening of the centering sleeve and correspondingly the first section of the lighting element is elliptical or oval, edges are prevented and a homogenous pressure distribution along the full perimeter can be achieved. At the same time slipping of the O-ring out of the grooves can be prevented. Therein, it has been shown, that by the elastomeric O-rings when inserting the lighting element into the centering ring, a restoring force is generated at the end position due to compression of the O-rings during insertion caused by friction between the O-ring and the inner surface of the centering sleeve. The lighting element would be displaced in the axial direction due to this restoring force. However, according to the present invention the snap fit connection between the lighting element and the centering ring prevents displacement of the lighting element relative to the centering ring due to the restoring force generated by the O-rings. In particular, the snap force or force in order to release the snap fit connection between the first snap fit feature and the second snap fit feature is larger than the restoring force generated by the one or more O-rings. Thus, the lighting element can be placed with high accuracy also with respect to the axial direction and no axial displacement occurs caused by use of the elastomeric O-rings in the friction fit.

[0029] Preferably, the one or more grooves have a depth D of between 0.25mm to 4mm, preferably between 0.4mm and 3mm and more preferably between 0.5mm and 2mm. By these dimensions it has been shown by the inventors of the present invention that it is ensured that the elastomeric O-ring is securely kept within the groove and cannot slip off upon inserting of the lighting element. At the same time sufficient friction is generated between the O-rings and the centering sleeve in order to provide a reliable positioning of the lighting element with high accuracy.

[0030] Preferably, the one or more grooves have a width T in the axial direction of between 0.5mm and 3mm, preferably between 0.8mm and 2mm and more preferably between 1mm and 1.5mm. In particular, the one or more groves have a width T that is unequal to the depth of the respective groove. By these dimensions it has been shown by the inventors of the present invention that it is ensured that the elastomeric O-ring is securely kept within the groove and cannot slip off upon inserting of the lighting element. At the same time sufficient friction is generated between the O-rings and the centering sleeve in order to provide a reliable positioning of the lighting element with high accuracy.

[0031] Preferably, the thickness W of the uncompressed O-ring is between 0.5mm and 4.5mm, preferably between 0.75mm and 3mm and more preferably between 1mm and 2.5mm. By this dimension it has been shown by the inventors of the present invention that a sufficient clamping force is generated between the O-ring and the centering sleeve and provide a reliable positioning of the lighting element with high accuracy.

[0032] Preferably, the ratio D / W of the depth D of the groove and the width W of the O-ring is between 0.3 and 0.95, preferably between 0.35 and 0.92 and more preferably between 0.4 and 0.9. It has been shown by the inventors of the present invention that the ratio D / W of the depth D of the groove and the width W of the O-ring provides sufficient friction between the centering ring and the lighting element in order to maintain the position of the lighting element within the centering ring. At the same time, the connection is still releasable and can be inserted tool-free, wherein the snap fit connection is sufficient in order to overcome the restoring force generated by the elastomeric O-rings.

[0033] Preferably, the lighting element comprises a first illumination direction and an opposite second illumination direction. By the centering plate having two identical keying features arranged in 90° to each other, the illumination direction can be tailored to the specific requirements of the automotive luminaire.

[0034] Preferably, the lighting assembly is built as H3 or H1 LED retrofit and can be inserted in existing H3 or H1 lamp sockets in order to replace conventional incandescent lights.

[0035] In the following the present invention is described in more detail with reference to the accompanying figures.

[0036] The figures show: Figure 1a lighting assembly according to a first embodiment of the present invention, Figure 2a centering ring in top-view of the first embodiment, Figure 3the centering ring of Figure 2 in a side-view, Figure 4a detailed view of a lighting element according to the present invention, Figure 5a cross-sectional view of the lighting assembly according to the present invention, Figure 6a second embodiment of the lighting assembly according to the present invention, Figure 7a top-view of a centering ring according to the second embodiment and Figure 8a side-view of the centering ring of figure 7.

[0037] The lighting assembly 10 according to the present invention as shown in Figure 1 comprises a lighting element 11 with a support body 21 and having a first end 12 and an opposite second end 16. At the first end 12 of the lighting element 11 a plurality of light emitting devices 18 and in particular light emitting diodes (LEDs) are arranged. Therein, the light emitting devices 18 may be arranged at the front face 20 of the lighting element and / or the back face of the lighting element (not shown). At the second end 16 of the lighting element 11 a heat sink 22 is arranged. Therein, the first end 12 of the lighting element 11 may extend into a reflector of an automotive luminaire. The lighting assembly 10 is fixed to the automotive luminaire by a centering ring 14 which is inserted into a lamp socket of the automotive luminaire. When operated, heat generated by the light emitting elements 18 is conducted away towards the heat sink 22 and dissipated. In order to improve heat conductance, the support body 21 of the lighting element 11 and / or the heat sink 22 may be made from a metal having good heat conductance, such as aluminum or the like.

[0038] Referring to Figures 2 and 3 showing a top view and a side-view of the centering ring 14. The centering ring 14 comprises a centering sleeve 30 having a first end 32 and an opposite second end 34. The second end 34 comes into contact with a contact surface 36 (see Figure 4) of the heat sink 22. A centering plate 28 is connected to the first end 32 of the centering sleeve 30. The centering sleeve 30 has an opening 24 with an inner surface 26. The shape of the opening 24 of the centering sleeve 30 is in the shown embodiment oval. Thus, the opening 24 may have a width H2 which is larger than the height H1. By the oval shape of the opening 24 orientation between the lighting element 11 and the centering ring 14 in respect to the rotational direction is achieved. The opening 24 is configured to receive at least partially the lighting element 11. In particular, a first section 41 (see Figure 4) of the heat sink 22 is received and in particular fully received in the opening 24 of the centering sleeve 30. By the centering sleeve 30 centering of the light emitting elements 18 within the reflector of the automotive luminaire is achieved. Axial positioning of the lighting elements 18 within the reflector of the automotive luminaire may be facilitated by the contact surface 36 which comes into contact with the second end 34 of the centering sleeve 30 when the first section 41 of the heat sink 22 is fully received by the centering ring 30.

[0039] As shown in Figure 2, the centering plate 28 comprises a plurality of keying features 16A, 16B in order to provide a form fit with a lamp socket of the automotive luminaire. In the example of the first embodiment, the keying features 16A, 16B correspond to a H1 lamp socket. As shown in the Figure 2, the keying feature 16A, 16B comprises two indentations which are differently shaped in order to provide a unique orientation of the centering ring 14 relative to the lamp socket. In the embodiment of Figure 2 also second keying features 16A', 16B' are provided which are shifted by 90° relative to the first keying features 16A, 16B. Hence, the centering ring 14 can inserted into the lamp socket in two position which differ by 90°. Consequently, the front face 20 of the lighting element 11 can be adapted accordingly such that the illumination direction of the light emitting elements 18 can be tailored to the specific needs of the respective application.

[0040] In addition, the centering ring comprises a keyway 38 as first snap fit feature. The keyway 38 is engaging with a detent 40 arranged at the first section 41 of the lighting element 11. Further, at the first section 41 grooves 46 are arranged. In the grooves 46 as shown in Figure 5, elastomeric O-rings 47 are arranged. By the outer surface 42 of the first section 41 in combination with the friction fit generated by the elastomeric O-rings 47 in the respective grooves 46, a reliable positioning of the lighting element 11 in the centering ring 14 can be established. Therefore, two grooves 46 comprising each an elastomeric O-ring are provided to provide a reliable centering. Therein, it has been shown that by the elastomeric O-rings 47 a restoring force is created when inserting the light element 11 into the centering ring 14 which would cause an axial displacement of the lighting element 11 from its desired position in a direction opposite to the insertion direction 49. In order to overcome or compensate for the restoring force created by the elastomeric O-rings 47, the detent 40 engages the keyway 38 of the centering ring 14 and creates a releasable snap fit connection between the lighting element 11 and the centering ring 14 and maintains the centering ring 14 in the axial position such that the second end 34 of the centering sleeve 30 remains in direct contact with the contact surface 36 of the heat sink 32. Due to the snap fit connection between the lighting element 11 and the centering ring 14 the lighting element 11 is not undesirable pushed away by the restoring force from the terminal position in which the centering ring 14 abuts against the contact surface 36.

[0041] Assembly of the lighting assembly 10 into the lamp socket of the automotive luminaire is facilitated by inserting the centering ring 14 into the lamp socket without the lighting element 11. Subsequently, the lighting element 11 is inserted into the centering ring 14. Therein, the oval shape of the first section 41 forms a from fit with the oval shaped opening 24 of the centering ring 14, thereby providing a defined position of the lighting element 11 with respect to the rotational position. In order to insert the lighting element 11 into the centering ring 14, the maximum diameter R1 of the support element 21 is smaller than the diameter R2 of the first section such that the support element 21 can be guided through the opening 24 of the centering ring 14. As soon as the first section 41 comes into contact with the inner surface 26 of the centering ring 14, the elastomeric O-rings 47 and the outer surface 42 come into contact with the inner surface 26 and provides a form fit together with a friction fit. If the lighting element 11 is further inserted and in particular the first section 41 is fully inserted into the centering sleeve 30, the keyway 38 of the centering ring 14 engages with the detent 40 of the lighting element and fixes the axial position of the lighting element 11 relative to the centering ring 14, providing a reliable position of the lighting element 11 within the automotive luminaire with high accuracy. Further, the connection between the lighting element 11 and the centering ring 14 is releasable in order to disassemble the lighting element 11 from the lamp socket of the automotive luminaire.

[0042] In the following it is referred to another embodiment, wherein the same or similar elements are indicated by the same reference numbers. The embodiment shown in Figures 6 to 8 comprises features which are identical to the first embodiment as shown in Figures 1-5, wherein the description of the similar features are omitted for brevity. However, the centering ring 14 has a different shape as shown in Figure 7. The centering ring 14' has a single indentation or cut 46 that the centering ring 14' corresponds to a H3 lamp socket and can be inserted into a H3 lamp socket in a unique position. In addition, also in the second embodiment, the centering ring 14 comprises a keyway 38 which engages with a respective detent 40 of the lighting element 11 to generate a snap fit connection between the lighting element 11 and the centering ring 14'.

Claims

1. Centering ring for a lighting assembly of an automotive luminaire, comprising: a centering sleeve having an opening configured to receive a lighting element, a first end and an opposite second end, a centering plate connected to the first end of the centering sleeve and configured to be received by a lamp socket of the automotive luminaire, and at least one first snap-fit feature arranged at the second end of the centering ring to engage a corresponding snap-fit feature at the lighting element when received in the centering sleeve.

2. Centering ring according to claim 1, wherein the first snap-fit feature is built as detent or keyway.

3. Centering ring according to claim 1 or 2, wherein the first snap-fit-feature is built as annular snap-fit.

4. Centering ring according to any of claims 1 to 3, wherein the opening has an elliptic or oval shape.

5. Centering ring according to any of claims 1 to 4, wherein the centering plate comprises at least one keying feature preferably arranged at the perimeter of the centering plate.

6. Centering ring according to claim 5, wherein the centering plate has two identical keying features preferably arranged in 45° or 90° to each other.

7. Centering ring according to claim 5 or 6, wherein the keying feature corresponds to an H3 or H1 lamp socket.

8. Lighting assembly in particular for an automotive luminaire, comprising: a centering ring according to any of claims 1 to 7 and a lighting element received in the centering sleeve of the centering ring, wherein the lighting element comprises at least one second snap-fit feature configured to engage with the first snap-fit feature when the lighting element is received in the centering sleeve.

9. Lighting assembly according to claim 8, wherein the second snap-fit feature is shaped as detent or keyway in correspondence with the first snap-fit feature.

10. Lighting assembly according to claim 8 or 9, wherein the lighting element comprises a first end and a heat sink at an opposite second end, wherein the heatsink of the lighting element is at least partially received in the centering sleeve.

11. Lighting assembly according to any of claims 8 to 10, wherein the lighting element comprises a first section having a substantially corresponding shape to the shape of the opening of the centering sleeve and a second section, wherein the first section is received by the centering sleeve, and wherein preferably the first section and second section are defined by the heat sink.

12. Lighting assembly according to claim 11, wherein between the first section and the second section a contact surface is arranged, wherein the second end of the centering sleeve abuts against the contact surface when the lighting element is fully received by the centering sleeve, wherein preferably the second snap-fit feature is arranged at the contact surface.

13. Lighting assembly according to claim 11 or 12, wherein at the first section at least one groove is arranged, wherein an O-ring is arranged in the at least one groove, wherein the O-ring comes into contact with an inner surface of the centering sleeve to position the lighting element within the centering ring.

14. Lighting assembly according to claim 13, wherein the ration of the depth of the groove and the width of the O-ring is between 0.5 and 0.95, preferably between 0.6 and 0.92 and more preferably between 0.7 and 0.9.

15. Lighting assembly according to any of claims 8 to 14, wherein the lighting assembly is an H3 or H1 LED-retrofit.

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