Internal or outdoor luminaire, in particular a street lamp, with adjustable free-form lens

Abstract

The invention relates to a luminaire for indoor or outdoor lighting, in particular a street light, with at least one LED as a light source and at least one free-form lens associated with the LED for influencing the light distribution emitted by the luminaire, wherein the free-form lens is not rotationally symmetric, wherein the free-form lens and the LED can be displaced relative to each other by a relative movement between at least a first and a second position, and wherein the relative movement at least partially comprises a movement perpendicular to the main emission direction of the LED, and the free-form lens produces different light distributions in the first and the second position.

Description

[0001] The invention relates to a luminaire for stationary indoor or outdoor lighting, in particular a street light, with at least one LED (light-emitting diode, which also includes an OLED, organic light-emitting diode) and a free-form lens associated with the LED.

[0002] For indoor and outdoor lighting, especially streetlights, LEDs are increasingly used as light sources due to their energy-saving and long lifespan advantages. These nearly point-source light sources require a modified optical system compared to conventional light sources in order to achieve the desired light distribution for the specific application.

[0003] As with traditional lighting, LEDs also utilize reflector technology. Here, the point-like light images of the LEDs, which can be arranged in clustered arrays, are distributed across the surface of the reflector. This also reduces glare. However, a disadvantage of this reflector technology is that the failure of individual LEDs can alter the light distribution curve, resulting in a deterioration of illumination uniformity and brightness.

[0004] Another way to direct the light is by spatially distributing the LEDs on curved surfaces. However, here too, the failure of individual LEDs results in a change in the desired light distribution. Furthermore, the mounting elements for the LEDs must be adapted to the spatial distribution of the LEDs.

[0005] The use of light-directing lenses on single or multiple LEDs is another way to create a defined light distribution on a working plane, such as a road. Here, individual LEDs on an LED carrier are assigned lenses. If several LEDs with their associated lenses have the same spatial arrangement, the failure of individual LEDs has only a very minor impact on the resulting light distribution.

[0006] However, the solution using lenses is relatively expensive because the lenses must be manufactured specifically for the lighting task. For different lighting tasks, i.e., to achieve different light distributions, freeform lenses must be individually developed. Furthermore, each luminaire is only suitable for a specific lighting task.

[0007] Another way to change the light distribution of a luminaire is to move an additional lens parallel to the optical axis of the luminaire to focus or defocus a rotationally symmetrical light distribution. However, this method allows for only a few variations of light distribution. US 2008 / 0273324 A1 proposes rotating a matrix of circularly symmetrical lenses laterally relative to a matrix of LEDs. This allows the luminaire's circular light distribution to be transformed into an oval-shaped one. However, even in this example, the possibilities for influencing the light distribution by moving the lens are very limited.

[0008] US 2010 / 172135 A1 discloses an LED device with one or more lenses for generating a desired light distribution, e.g., a light distribution for illuminating a road. It takes into account that each lens on an LED can be individually rotated to produce a desired light distribution.

[0009] US patent 2005 / 018434 A1 discloses a lighting device with one or more LEDs according to the preamble of claim 1.

[0010] The object of the present invention is to develop a luminaire for the stationary illumination of indoor or outdoor areas, in particular a street luminaire, which can be adapted cost-effectively to the respective lighting task.

[0011] The problem is solved by a luminaire for indoor or outdoor lighting, in particular a street light, according to claim 1.

[0012] According to the invention, at least one freeform lens, i.e., with a non-rotationally symmetrical profile, and the LED are movable relative to each other. This can be achieved either by moving the lens relative to the LED, with the LED being stationary on the luminaire, or alternatively, by moving the LED relative to a stationary lens mounted in the luminaire. This movable position allows the lens and the LED to be arranged in at least two different positions relative to each other, with the movement between the two positions including at least one movement perpendicular to the main emission direction of the lens. In combination with the use of a freeform lens, this allows the light distribution of the luminaire to be changed much more flexibly than is possible, for example, by moving a lens along the optical axis of the LED.In particular, the freeform lens generates different light distributions in at least two or more different positions, which are adapted, for example, to the lighting requirements of a street light, as explained in more detail below. A particular advantage is the lateral displacement of a non-rotationally symmetric freeform lens compared to the LED. Due to the deviation from rotational symmetry, the lens's light distribution is already adapted to a specific lighting task, and the light distribution can be further modified by moving the lens. It is also possible to generate light distributions that deviate from simple axial symmetry perpendicular to the lens's displacement direction, because the lateral displacement of the non-rotationally symmetric lens allows for more varied angles of incidence between the LED's light radiation and the freeform lens's incidence and reflection surfaces.With a rotationally symmetrical lens, as is common in the prior art, only a minimal distortion of the light distribution, e.g. from circular to oval, can be achieved.

[0013] According to the invention, the light distribution in the first and second positions exhibits a longitudinal extent around the luminaire at a predetermined emission angle, i.e., in a so-called conical curve. Two distinct maxima are generated, arranged on a common axis, which is, for example, positioned along a road illuminated by the luminaire (i.e., in the directions of the C0 / C180 plane). Such a light distribution is suitable for illuminating a street with multiple luminaires, the longitudinal distribution helping to allow for relatively large pole spacings for the streetlights. The maxima are arranged symmetrically to the C90 / C270 plane, which runs perpendicular to the road axis. The angle between the C0 / C180 plane, in which the road axis runs, and the two distinct maxima forms a so-called light band bend.This beam angle is preferred for illuminating a road as uniformly as possible over a longitudinal section using a luminaire positioned at the roadside or an adjacent pedestrian and / or vehicular path. To create this beam angle, the lens must deflect a large portion of the light from the light source at the angle of the beam angle. This is achieved with a convex geometry in an inner cavity of the freeform lens. It is also possible to incorporate multiple cavities, with or without a prism structure, within a single lens. For example, each cavity can be assigned to one of the LEDs. Multiple LEDs can also be arranged within a single cavity.

[0014] According to the invention, the angle of the light band's bending between the two positions is changed by moving the lens. In particular, it is also possible to continuously adjust the angle of the light band's bending by moving the lens between the two positions. This allows the luminaire to be individually adapted to the spatial conditions of the streets as well as to the selected pole spacing of the streetlights. This makes it possible to select a pre-configured luminaire type for use in various spatial situations.

[0015] According to one embodiment, the freeform lens has a plane of symmetry in a C-plane, preferably the C90 / C270 plane, and the relative movement occurs along a direction in this plane of symmetry. This embodiment is particularly suitable for illuminating straight roads. However, if the road has an irregular curve in the section to be illuminated or a steep longitudinal gradient, a deviation from mirror symmetry in the C90 / C260 plane can also be advantageous in order to achieve uniform illumination of the road section. The lens's adjustability allows for individual adaptation to the location of the luminaire, e.g., the distance to the road edge and the height of the luminaire pole.

[0016] According to a preferred embodiment, the luminaire has several LEDs, and each LED is assigned a freeform lens. This not only serves to generate a higher illuminance but also has the advantage that the LEDs can act redundantly, so that if one LED fails, the lighting task is still guaranteed, albeit with reduced overall intensity.

[0017] According to a preferred embodiment, the freeform lenses can be moved relative to the LEDs by a common relative movement. This allows all lenses to be adjusted with a single movement to produce the desired light distribution. According to an alternative embodiment, the individual freeform lenses can also be moved independently relative to their respective associated LEDs. This allows different light distributions to be generated with the individual lens-LED pairs, which are superimposed to produce the desired overall light distribution of the luminaire.

[0018] In particular, several or all of the freeform lenses can be shaped the same way, so that with the relative movement all lenses produce the same light distribution.

[0019] According to a preferred embodiment, the multiple identical freeform lenses are arranged in the same position relative to their associated LEDs. This ensures that all lens-LED pairs in the luminaire produce the same light distribution, which overlap with each other in the same spatial orientation. Therefore, if one LED fails, the overall light distribution produced by the luminaire remains unchanged. According to an alternative embodiment, some freeform lenses can also be arranged offset from their respective associated LEDs along an axis, particularly in the direction of relative movement. In this embodiment, the individual lens-LED pairs can produce different light distributions, e.g., different beam angles, which overlap in the overall light distribution of the luminaire. This allows for the creation of new light distribution curves.By moving the lenses relative to the LEDs, this light distribution can also be individually adjusted.

[0020] In embodiments with multiple LEDs and freeform lenses, each of the freeform lenses can generate a light band bend with the same angle. However, it is also possible for the freeform lenses of different LEDs to generate different light band bends. This can be achieved either by arranging the lenses differently relative to the LEDs or by having a different shape to produce a different angle of light band bend.

[0021] According to a preferred embodiment with multiple freeform lenses and LEDs, the multiple LEDs are arranged in a plane or along a straight axis, and the lenses are arranged in an array so as to be displaceable parallel to the plane or parallel to the axis. In this embodiment, the light distributions of the individual lens-LED pairs superimpose uniformly in the at least two different positions, so that the symmetry of the overall light distribution achieved is maintained even when the lenses are adjusted relative to the LEDs. By adjusting the lenses relative to the LEDs, for example, the distance between two maxima in the light distribution curve in the cone-shaped curve can be adjusted, or the angle of the light band bending can be changed.

[0022] According to a preferred embodiment, several freeform lenses are arranged on a common lens carrier, and the lens carrier can be moved relative to the LEDs. This makes the embodiment with multiple LEDs and multiple freeform lenses particularly easy to manufacture. Furthermore, adjusting the light is simple because only one lens carrier needs to be moved relative to the LEDs. However, according to an alternative embodiment, it is also possible to individually adjust individual freeform lenses or groups of freeform lenses relative to their respective associated LED(s).

[0023] The lens carrier can be manufactured together with the freeform lens or as a separate component. For example, the freeform lenses can be made of a transparent plastic such as PMMA. The lens carrier can be made of the same plastic material or a different one, e.g., a non-transparent plastic, and can be manufactured as a single piece with the lenses or separately.

[0024] According to a preferred embodiment, a lens carrier for a single freeform lens or a lens carrier for multiple freeform lenses has at least one, preferably two, opposing reflective side walls facing the one or more LEDs. Generally, the reflective side wall increases the efficiency of the luminaire. Preferably, reflective side walls, each facing the LED(s), are arranged on two opposite sides. According to a further development of this embodiment, the at least one, or preferably the two, side walls are arranged parallel to a plane of symmetry of the light distribution that the luminaire produces in one or both positions of the freeform lens(es) relative to the LED(s). With symmetrical light distribution, this arrangement of the side walls has no influence on the light distribution curve.However, large side-emitting angles and thus large lamp designs can be avoided because the light is reflected off the side wall without affecting the light distribution.

[0025] The lenses can be moved relative to the LED either manually or automatically. Manual adjustment allows the desired light distribution to be set at the mounting location. With automatic adjustment, for example via an electric servo motor or similar mechanism, the light distribution can be changed even after installation. For instance, the light can have different distributions during the day and night, or the distribution can be adapted to the weather conditions and the reflective or absorptive properties of the road surface. Furthermore, the light can be configured to interact with a transmitter in a vehicle, automatically changing the light distribution when a vehicle approaches, for example, to prevent the driver from being blinded by the street light.

[0026] Further features and advantages of the present invention will become apparent from the following description of preferred embodiments, which is given in conjunction with the accompanying figures. The figures illustrate the following: Figure 1 shows a cross-section in the C90 / 270 plane of a movable freeform lens on a PCB with an LED. Figure 2a shows a section perpendicular to the C-planes (i.e., in a section parallel to the surface on which the LED is mounted) of the arrangement. Figure 1 Figure 2b shows a cone-shaped curve of a light distribution of the arrangement according to Figure 2a Figure 3a shows the section after Figure 2a with a displaced lens. Figure 3b shows a conical surface curve of a light distribution of the arrangement according to Figure 3aFigure 4a shows a section perpendicular to the C-planes (i.e., a section parallel to the surface on which the LEDs are mounted) through an arrangement with three freeform lenses. Figure 4b shows cone-shaped curves of light distributions of the arrangement. Figure 4a Figure 5 shows a movable single freeform lens on a carrier in a perspective view. Figure 6 shows a single freeform lens in a perspective view. Figure 7 shows a lens carrier for four single freeform lenses. Figure 6 Figure 8 shows a movable 1x2 lens array in perspective view. Figure 9 shows a lens holder for two lens arrays. Figure 8Figure 10 shows a lens carrier for an XxX lens array in perspective view. Figure 11 shows a lens carrier with reflective sidewalls in perspective view. Figure 12 shows a section through a freeform lens of an unclaimed example, wherein the section lies in a surface parallel to the surface on which the LED is arranged. Figure 13 shows a section corresponding to the Figure 12 by another unclaimed example of a freeform lens. Figure 14 shows a section corresponding to the Figure 12 by another unclaimed example of a freeform lens.

[0027] Referring to the Figures 1 to 3bAn embodiment of a luminaire configured as a street light is described. An LED 1 is arranged on a substrate, in particular a PCB (printed circuit board) 5, and is fixedly mounted in a luminaire housing (not shown). A free-form lens 2 made of glass or a transparent plastic such as PMMA, PU, ​​or silicone is arranged above the LED. The LED 1 is arranged within a cavity 10 of the free-form lens 2. The cavity 10 has, as shown in the Figures 2a and 3a A convex geometry can be seen, which causes the light from LED 1 to be refracted, as indicated by the light rays L1, L2, and L3. The freeform lens 2 is mounted so that it can be moved relative to the PCB 5 with lens 1. The direction 4 of the movement lies in a C90 / 270 plane of the luminaire.

[0028] Different light distributions are produced by moving the freeform lens 2 relative to the LED 1. The illustrated embodiment is particularly intended for generating a light distribution for street lighting. The convex geometry 9 of the inner cavity 10 ensures a light distribution curve that produces two pronounced maxima in a horizontal section of the C-planes, the so-called conical surface curve. The maxima are symmetrical with respect to the C90 / 270 plane and arranged at an angle 11 with respect to the C0 / 180 plane to form a bend in the light band. In the configuration according to Figures 2a and 2b The angle of the light strip bend 11 is only about 5°. This configuration is suitable for illuminating a relatively narrow street, as in Figure 2bAs indicated. The bend in the light band makes it possible to position the luminaire 8 laterally to the road and to illuminate the road relatively evenly over a large longitudinal section. By moving the lens in one direction in the C90 / 270 plane, i.e., in a direction perpendicular to the main emission direction of the LED, the angle 11 of the bend in the light band changes. As in Figure 3b As can be seen, with the displaced lens 2, the angle 11 of the light band bending is approximately 30°. This configuration is particularly suitable for illuminating a wider street, as in Figure 3b is shown.

[0029] Accordingly, the same luminaire 8 can generate different light distributions with a modified light band bend 11 by shifting the free-form lens 2 relative to the LED 1 along direction 4, i.e., in the C90 / 270 plane, and thus be adapted for illuminating roads of varying widths. Depending on the shift path, all configurations can be illuminated in accordance with standards, from very narrow to very wide roads. Furthermore, different overhangs of the luminaire relative to the road edge in positive or negative directions can be compensated for by shifting the lens 2. The light distribution curve can also be adapted to curved roads by adjusting the angle of the light band bend.

[0030] The Figure 4Figure 8 shows another possibility for generating a desired light distribution by different lens positions 19, 20, 21 of three LEDs 1 within a luminaire 8. The freeform lenses 2 in this embodiment are identical to the freeform lens 2 described above. However, three LEDs 1 are provided within the luminaire 8, and the three freeform lenses 2 are arranged in three different positions along the displacement direction x in the C90 / 270 plane relative to their respective associated LED 2. The three different positions 19, 20, and 21 result in three different conical radii 22, 23, and 24, which are shown in the Figure 4bThese light distributions are shown. These light distributions superimpose to form an overall cone curve 25. In this embodiment, the freeform lenses 2 can be individually moved relative to the LEDs. By using individual movable freeform lenses 2 in the luminaire 8, different lens displacements can be used to create a superposition of the light distributions with different light band bends, thus generating new light distribution curves. One application is, for example, the illumination of squares. Due to the superposition of the light band bends at different lens positions in the luminaire 8, no specific angle is defined in the light band bend of the light distribution curve 25. The overall light distribution 25 is suitable not only for wide streets but also for illuminating squares or areas with greater depth in the direction of the C90 / 270 plane.

[0031] Figure 5Figure 1 shows a possible embodiment of a movable freeform lens 2 on a PCB 5. The freeform lens 2 is held above the LED 1 by a lens carrier 12, which is fixedly connected to the PCB 5. The lens 2 is slidably arranged within the lens carrier 12, so that the lens 2 can be moved along direction 4 above the LED (in Figure 5The lens 2 can be continuously moved (hidden in the figure). A groove structure 13, connected to the freeform lens 2, and an opposing groove structure on the lens holder 12 (hidden in the figure) allow the lens 2 to be held in various displacement positions. The position of the lens relative to the LED 1 can be read from a marking 14 on the lens holder 12 and an opposing marking on the lens 2. Each position of the lens 2 corresponds to a predefined light distribution, which in this example defines an angle in a light band bend. The lens 2 can be manually moved in direction 4 against the resistance exerted on the lens by the groove structure 13. However, according to an alternative embodiment, in these and other embodiments, the lens 2 can be moved fully automatically by a sensor control (e.g., with an electric motor).

[0032] Furthermore, in the Figure 7 and 9 A lens carrier 16 is shown, which can hold several lenses. The lens carrier 16 according to Figure 7 is designed to accommodate multiple single lenses 15 according to Figure 6 to be recorded in a movable manner, as previously described in connection with Figure 5 This has been explained for a single lens 15. Alternatively, it can also be provided that each of the individual lenses 15 is fixedly mounted to the carrier 16 and the entire carrier 16 is moved relative to the LEDs 1. In such a construction, all individual lenses 15 can be adjusted uniformly relative to the LEDs by a sliding movement of the carrier 16 relative to the LEDs 1.

[0033] In the Figures 8 and 9 An embodiment is shown in which the freeform lens is grouped in an array of 1x2 lenses. Two of the lens arrays 15 according to Figure 8 are placed in the lens carrier 16 according to Figure 9The lenses are inserted into the designated space 17 and can be moved together via two LEDs 1. In this embodiment, the two freeform lenses 2 of the lens array 15, each identically aligned with its corresponding LED 1, produce the same light distribution, so that these light distributions superimpose identically with negligible displacement. In the event of an LED failure, the overall light distribution of the light produced by the lens array is not changed, but only reduced in overall intensity.

[0034] In the Figure 10 A lens carrier for an XxX lens array (not shown in the figure) is shown. An array of any number of matrix-arranged freeform lenses 2 can be placed in position 17 of the lens carrier and moved in two directions in a plane above the LEDs.

[0035] Figure 11Figure 1 shows a lens carrier 16 for four individual free-form lenses. In this embodiment, side walls are also provided which are reflective, in particular highly reflective, on the side 18 facing the LEDs. The reflective side walls 18 are arranged parallel to the C90 / 270 plane and parallel to the displacement plane of the lenses. With a light distribution symmetrical with respect to the C90 / 270 plane, the side walls have no influence on the light distribution because the reflection planes are parallel to the plane of symmetry. However, the reflective side walls allow the luminaire to be made smaller because large lateral beam angles are no longer necessary.

[0036] Further examples of freeform lenses are found in the Figures 12, 13 and 14 illustrated. In the examples in Figures 12 and 13A prism structure 26 is provided on the freeform lens 2. This prism structure can be provided on the light-entry surface, i.e., within the cavity 10, as shown in the Figure 12 as shown. Alternatively, it may also be provided as shown in Figure 13 The figure shows a prism structure 26 being provided on the outside of the freeform lens 2. The prism structure provides a focusing arrangement, e.g., in the manner of a Fresnel structure, in order to generate, in particular, a bending of the light distribution. A particular advantage is that by moving the lens, the angles of incidence of the light rays on the prism surfaces change considerably, so that the movement of the lens in conjunction with the prism structures makes it possible to strongly influence the light distribution of the luminaire. In the Figure 14Figure 1 shows another example of a freeform lens that can also produce light band bending. In this freeform lens, a region 27 is provided within the lens that has a different refractive index than the surrounding region. For example, region 27 can be formed by another cavity, i.e., with a refractive index n=1. However, it is also possible to fill region 27 with a transparent material with a different refractive index than the surrounding material, for example, with a glass or plastic material with a higher or lower refractive index.

[0037] Further modifications of the embodiments described above are possible within the scope of the invention, which is defined by the appended claims. In particular, the preceding embodiments were described such that the lens always moves relative to the LEDs. However, it is also possible to mount the lenses stationary on the luminaire and to move the LEDs relative to the lenses by means of appropriate devices. Furthermore, it is possible to provide any combination of single lenses and lens arrays within a lens carrier or on several lens carriers within a luminaire; for example, more than 10 or 50 LEDs can be specified. Furthermore, several LEDs can each be assigned to one lens. In general, the lens carriers can be adjustable relative to the luminaire in order to move the lenses relative to the LEDs.However, the lens can also be moved within the lens carrier to achieve relative movement with respect to the LED. Reference symbol list:

[0038] 1 LED 2 Freeform lens 3 Road direction 4 Direction of freeform lens movement 5 PCB 6 Conical curve with light band bend 7 Road (narrow width) 8 Street light 9 Convex geometry in the inner cavity 10 Lens cavity 11 Angle of light band bend 12 Lens carrier 13 Grooved structure 14 Marking 15 Single lens or lens array 16 Lens carrier array 17 Space for lenses / lens arrays 18 Reflective side wall 19 Lens position 20 Lens position 21 Lens position 22 Light band bend of the single lens in the luminaire at lens position 21 23 Light band bend of the single lens in the luminaire at lens position 20 24 Light band bend of the single lens in the luminaire at lens position 19 25 Resulting LVK due to the superposition of the Light band bends 22, 23 and 24 26 Prismatic structures 27 Cavity or region with different refractive index L1 Light beam L2 Light beam L3 Light beam

Claims

1. Luminaire for internal or outdoor lighting, in particular a street light (8), with at least one LED (1) as light source, and; at least one free-form lens (2) assigned to the LED (1) for influencing the light distribution emitted by the luminaire, and wherein the free-form lens (2) is not rotation-symmetric, wherein the free-form lens (2) and the LED (1) can be displaced in relation to one another by a relative movement (4) between at least one first and one second position, and wherein the relative movement (4) comprises at least partially a movement perpendicular to the main beam direction of the LED (1), and the free-form lens (2) produces different light distribution in the first and second position, characterized in that in at least one of the positions the light distribution in the conical shell curve (6; 22, 23, 24) exhibits an optical pattern curvature, wherein the light distribution in the conical shell curve produces two distinct maxima in a horizontal section of the C planes, and the two maxima are symmetrical relative to the C90 / C270 plane and arranged at an angle relative to the C0 / C180 plane to form the optical pattern curvature, and the angle (11) of the optical pattern curvature is different between the two positions, wherein the free-form lens (2) has an inner cavity (10) with a convex geometry (9), and wherein the LED is arranged within the inner cavity (10) of the free-form lens (2) .

2. Luminaire according to claim 1, wherein the light distribution in a conical shell curve (6; 22, 23, 24) exhibits a longitudinal extension when the free-form lens (2) is in the first and the second position in relation to the LED.

3. Luminaire according to any one of the preceding claims, wherein, with the relative movement (4) between the two positions, the angle (11) of the optical pattern curvature is continually adjustable.

4. Luminaire according to any one of the preceding claims, wherein the free-form lens (2) has a plane of symmetry and the relative movement (4) takes place along a direction in the plane of symmetry.

5. Luminaire according to any one of the preceding claims, wherein the luminaire comprises a plurality of LED's (1) and a free-form lens (2) is assigned to each LED (1).

6. Luminaire according to claim 6, wherein all the free-form lenses (2) can be moved in relation to the LED's (1) by a common relative movement (4).

7. Luminaire according to claim 5 or 6, wherein a plurality or all of the free-form lenses (2) are of the same shape.

8. Luminaire according to claim 7, wherein the plurality of same free-form lenses (2) are arranged in the same way in relation to the LED (1) assigned to them in each case, or are arranged along only one axis, in particular in the direction of the relative movement (4), offset to the respective LED.

9. Luminaire according to any one of claims 5 to 8, wherein the free-form lenses in each case produce a light distribution with optical pattern curvature (22, 23, 24) with the same or different angle (11) in at least one of the two positions.

10. Luminaire according to any one of claims 5 to 9, wherein the plurality of LED's (1) are arranged in one plane or along a straight axis, and the lenses are displaceably located in an array (15) parallel to the plane or parallel to the axis.

11. Luminaire according to any one of claims 5 to 10, wherein the plurality of free-form lenses (2) are arranged on a common lens carrier (16) and the free-form lenses can be displaced inside the lens carrier (16) or the lens carrier can be displaced as a whole by the relative movement (4) in relation to the LED's (1).

12. Luminaire according to any one of the preceding claims, wherein a lens carrier (16) of an individual free-form lens (2), or, by reference to claim 9, the common lens carrier (16) of the plurality of free-form lenses (2), comprises at least one reflecting side wall (18), which faces in the direction of the one or more LED's (1), wherein, in particular, the side wall (18) is arranged parallel to a plane of symmetry of the light distribution which the luminaires produce in one or in both of the positions.

13. Luminaire according to any one of the preceding claims, wherein the relative movement (4) can be carried out manually or can be carried out by an automatic drive.

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