Lighting arrangement with an exchangeable lighting cap

1. A lighting arrangement with an exchangeable lighting cap, comprising:

the lighting cap with at least one light emitting element arranged on a front face of said lighting cap, wherein a direction of illumination is perpendicular to the front face, and with two positioning slots arranged at an edge of the front face, each of the positioning slots being aligned perpendicular to the direction of illumination;

a holder with an opening for receiving at least the front face of the lighting cap, wherein two positioning elements are arranged at a rim of the opening, the positioning elements being insertable into the positioning slots of the lighting cap by elastic deformation of the holder or of the lighting cap to fix the position of the lighting cap in the holder by a tight fitting; and

a lock lever arranged at the lighting cap and the holder, the lock lever being turnable between an open position for inserting the lighting cap into the opening of the holder and a locked position for locking the lighting cap in position on the holder.

2. The lighting arrangement according to claim 1 , wherein the positioning elements are rounded pins and the positioning slots have a rectangular shape with three inner faces, wherein the rounded pins in an inserted position inside the positioning slots are elastically deformed and are in contact with each of the three inner faces.

3. The lighting arrangement according to claim 1 , wherein the positioning slots are arranged on opposing sides of the light emitting element.

4. The lighting arrangement according to claim 1 , wherein the lighting cap comprises a first and a second wing at the edge of the front face aligned perpendicular to the direction of illumination and each of the positioning slots is positioned in one of the wings.

5. The lighting arrangement according to claim 4 , wherein the first wing has a different width along the circumference of the front face than the second wing.

6. The lighting arrangement according to claim 4 , wherein the both wings are arranged on the lighting cap in a plane parallel to the front face.

7. The lighting arrangement according to claim 1 , wherein the shape of the opening of the holder and the shape of the front face including the wings of the lighting cap correspond to each other.

8. The lighting arrangement according to claim 1 , wherein the lock lever has two parallel surfaces, one of the surfaces being in an in-plane support with the holder in a reference plane between at least the holder and the lock lever.

9. The lighting arrangement according to claim 1 , wherein the lock lever has two parallel surfaces and one of the surfaces of the lock lever is partially in an in-plane support with a contact surface of each of the wings in the locked position of the lock lever in a reference plane between at least the lighting cap and the lock lever.

10. The lighting arrangement according to claim 1 , wherein the lighting cap comprises a support plane surface positioned parallel to the front face and shifted backwards relative to the front face and a spring element is provided on the support plane surface to press the lock lever against the contact surface of each of the wings in the locked position of the lock lever.

11. The lighting arrangement according to claim 10 , wherein the spring element is an elastic seal arranged on the support plane surface of the lighting cap.

12. The lighting arrangement according to claim 1 , wherein the lock lever is provided for bayonet-locking the lighting cap to the holder and two spring holders are arranged on a surface of the holder to engage with the first surface of the lock lever in the locked position pressing the lock lever towards the holder.

13. A method for turn-locking a lighting cap in a lighting arrangement, the method comprising:

providing a holder comprising an opening for the lighting cap with two positioning elements being arranged at a rim of the opening;

turning a lock lever with an opening into an open position where the opening of the lock lever and an opening of the holder are superposed;

inserting the lighting cap into the openings of the lock lever and the holder; and

turning the lock lever into a locked position locking the lighting cap to the holder, wherein during inserting the lighting cap into the opening of the holder, each of the two positioning elements of the holder are pushed into a positioning slot of the lighting cap under elastic deformation of the holder or of the lighting cap to fix the position of the lighting cap in the holder by a tight fitting.