Track lighting system comprising a luminaire having mating reflector modules

Abstract

The invention provides a lighting arrangement (1000) comprising a lighting unit (1500); wherein the lighting unit (1500) comprises a light generating device (100), a reflector (200), and a connector (400), wherein: (A) the light generating device (100) comprises a LED light source (10); wherein the light generating device (100) is configured to provide device light (101); (B) the reflector (200) is reflective for the device light (101); wherein the reflector (200) comprises a first reflector module (210), and a second reflector module (220); wherein the first reflector module (210) comprises a first internal light exit window (211) and a first external light exit window (212), and the second reflector module (220) comprises a second internal light exit window (221) and a second external light exit window (222); (C) the first reflector module (210) further comprises a first end part (215) and a first reflector wall (216); wherein the second reflector module (220) further comprises a second end part (225) and a second reflector wall (226); wherein the connector (400) is configured to physically connect the first end part (215) and the second end part (225); wherein the first reflector wall (216) comprises two first wall ends (217); wherein the second reflector wall (226) comprises two second wall ends (227); wherein the first reflector module (210) and the second reflector module (220) are configurable in different reflector configurations; (D) a first plane (P1) defined through the first end part (215) and the two first wall ends (217) and a second plane (P2) defined through the second end part (225) and the two second wall ends (227) have a mutual angle (β), with, in a first reflector configuration a first mutual angle (β1) and in a second reflector configuration a second mutual angle (β2), unequal to the first mutual angle (β1); and (E) the lighting arrangement (1000) is configured to generate arrangement light (1001) comprising at least part of the device light (101), wherein the device light (101) is transmitted through one or more of the first external light exit window (212) and the second external light exit window (222).

Description

[0001] TRACK LIGHTING SYSTEM COMPRISING A LUMINAIRE HAVING MATING

[0002] REFLECTOR MODULES

[0003] FIELD OF THE INVENTION

[0004] The invention relates to a lighting arrangement. The invention further relates to a lighting device comprising the lighting arrangement. The invention further relates to a track lighting system.

[0005] BACKGROUND OF THE INVENTION

[0006] Lighting arrangements are known in the art. For instance, US2010277922 Al describes a lighting apparatus including a reflector having a reflective exterior surface partially enclosing an interior space and defining a focal point within the interior space, and a high pressure discharge lamp positioned substantially at the focal point of the reflective exterior surface. In some examples, the high pressure discharge lamp includes an arc tube containing mercury, a metal halide, or sodium. In some examples, the reflective exterior surface extends along a longitudinal axis and curves around the longitudinal axis. In some example, the reflective exterior surface defines an elliptical paraboloid.

[0007] SUMMARY OF THE INVENTION

[0008] Lighting arrangements have been continuously developed for a number of decades. Such lighting arrangements have often been applied for the purposes of providing spot and / or track lighting in e.g., theater lighting systems and store lighting system. Therefore, it seems useful to position spots in a direction of gravity and / or enable tilting of the spots at varies angles. Especially, it is desired to improve the (optical) performance e.g., in terms of beam shaping and / or appearance of track lighting. Hence, it is an aspect of the invention to provide an alternative lighting arrangement, which preferably further at least partly obviates one or more of above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0009] According to a first aspect, the invention provides a lighting arrangement comprising a lighting unit. The lighting unit may especially comprise a light generating device, a reflector, and a connector. In embodiments, the light generating device may comprise a solid-state light source, especially a LED light source. The light source may be configured to generate light source light. Further, in embodiments, the light generating device may be configured to provide device light (along an optical axis (O)). Especially, the device light may comprise, or even essentially consist of, the light source light. In embodiments, the reflector may be reflective for the device light. The reflector may, in embodiments, comprise a first reflector module and a second reflector module. In embodiments, each of the reflector modules may comprise an internal light exit window. Additionally, in embodiments, each of the reflector modules may comprise an external light exit window. In embodiments, the first reflector module may further comprise a first end part and a first reflector wall. Similarly, in embodiments, the second reflector module may comprise a second end part and a second reflector wall. The first reflector module and the second reflector module may, in embodiments, be configured (directly and / or indirectly) physically connected. Especially, in embodiments, the connector may be configured to physically connect the first end part and the second end part. Furthermore, in embodiments, the first reflector wall may comprise two first wall ends. Similarly, in embodiments, the second reflector wall may comprise two second wall ends. In embodiments, the first reflector module and the second reflector module may be configurable in different (spatial) reflector configurations (leading to different beams of device light escaping the lighting unit). In embodiments, a first plane may be defined through the first end part and the two first wall ends. Similarly, in embodiments, a second plane may be defined through the second end part and the two second wall ends. The first plane and the second plane may, in embodiments, have a mutual angle (P). Especially, in a first reflector configuration (of the reflector modules) the first plane and the second plane may have a first mutual angle (pi). Further, in embodiments, in a second reflector configuration (of the reflector modules) the first plane and the second plane may have a second mutual angle (P2). The second mutual angle (P2) may especially be unequal to the first mutual angle (pi). Further, in embodiments, the lighting arrangement may be configured to generate arrangement light. Especially, the arrangement light may comprise at least part of the device light. In embodiments, the device light may be transmitted through one or more of the first external light exit window and the second external light exit window. Hence, in embodiments, the invention may provide a lighting arrangement comprising a lighting unit; wherein the lighting unit may comprise a light generating device, a reflector, and a connector, wherein: (A) the light generating device may comprise a LED light source; wherein the light generating device may be configured to provide device light (along an optical axis); (B) the reflector may be reflective for the device light; wherein the reflector may comprise a first reflector module, and a second reflector module; wherein the first reflector module may comprise a first internal light exit window and a first external light exit window, and wherein the second reflector module may comprise a second internal light exit window and a second external light exit window; (C) the first reflector module may further comprise a first end part and a first reflector wall; wherein the second reflector module may further comprise a second end part and a second reflector wall; wherein the connector may be configured to physically connect the first end part and the second end part; wherein the first reflector wall may comprise two first wall ends; wherein the second reflector wall may comprise two second wall ends; wherein the first reflector module and the second reflector module may be configurable in different (spatial) reflector configurations (leading to different beams of device light escaping from the lighting unit); (D) a first plane (Pl) defined through the first end part and the two first wall ends and a second plane (P2) defined through the second end part and the two second wall ends may have a mutual angle (P), with, in a first reflector configuration (of the reflector modules) a first mutual angle (pi) and in a second reflector configuration (of the reflector modules) a second mutual angle (P2), unequal to the first mutual angle (pi); and (E) the lighting arrangement may be configured to generate arrangement light comprising at least part of the device light, wherein the device light may be transmitted through one or more of the first external light exit window and the second external light exit window.

[0010] With such a lighting arrangement spot and / or track lighting may be provided in various applications such as theater lighting systems and store lighting system. The reflector modules may provide adjustability of the lighting arrangement (as a whole) to facilitate variation direction, size, shape, and angle of light beams escaping the lighting arrangement. Hence, adjustability of the reflector modules relative to each other may provide improved (optical) performance of the lighting arrangement at least in terms of beam shaping and / or appearance of the lighting arrangement (output) light. The invention may thus, in embodiments, provide a track lighting system comprising a luminaire having two mating reflector halves wherein a light exit window opening angle can be varied in a single direction.

[0011] In specific embodiments, the invention provides a lighting arrangement (or “lighting module” or “light generating system”) comprising a lighting unit. In further embodiments, the lighting unit may comprise a light generating device, a reflector, and a connector. Here below, embodiments of the different elements of the lighting arrangement will be described in further detail. The light generating device may, in embodiments, comprise a solid-state light source. Especially, the solid-state light source may comprise a light-emitting diode light source (i.e., a LED light source). The term “light source” herein may also refer to a light source comprising a solid-state light source, such as an LED or a laser diode or a superluminescent diode. Hence, in embodiments, the LED light source may comprise a diode selected from the group comprising a (simple) light-emitting diode (LED), a multi -junction light emitting diode, or a superluminescent diode (see also further below). Additionally or alternatively, in embodiments, a laser diode (especially a semiconductor laser) may be applied. Hence, in embodiments, the light generating device may comprise a LED light source. The LED light source may, in embodiments, be configured to generate light source light having a wavelength selected from the visible wavelength range (i.e., the range of 380- 780 nm). Additionally or alternatively, in embodiments, the LED light source may, in embodiments, be configured to generate light source light having a wavelength selected from the UV and / or IR wavelength range, see also further below. In embodiments, the light generating device may be configured to generate device light. In embodiments, the device light may comprise part of the light source light. Especially, in some embodiments, the device light may essentially consist of the light source light. Further, in embodiments, the light generating device may be configured to generate device light along an optical axis (O). Herein, the term “optical axis” (O) may be defined as an imaginary line that defines the path along which light propagates through a system starting from the light generating element. More especially, the optical axis (O) may coincide with the direction of the light with the highest radiant flux.

[0012] Further, the term “light generating device” may also refer to two or more, or even a plurality of light generating devices which may provide device light having essentially the same spectral power distributions. In specific embodiments, the term “light generating device” may also refer to two or more, or even a plurality of light generating devices which may provide device light having different spectral power distributions.

[0013] In embodiments, the light generating device may be configured to provide device light to the reflector. In embodiments, the reflector modules may comprise reflector walls (see also further below). The reflector walls may define an internal reflector space, in other words, the reflector walls may separate an internal reflector space from the external environment. In embodiments, the light generating device may be configured to provide device light to the reflector, especially to the internal reflector space of the reflector. Therefore, in embodiments, the LED light source of the light generating device may be configured centrally arranged on the connector, especially within the internal reflector space. Additionally or alternatively, in embodiments, the light generating device may comprise more than one LED light source, such that for each reflector module a respective LED light source may be configured on the connector. Especially, in some embodiments, for each reflector module a respective LED light source may be configured on the connector and within the internal reflector space. However, in other embodiments, for each reflector module a respective LED light source may be configured on the connector and outside of the internal reflector space. Hence, in such embodiments, the LED light source may be configured to “inject” light into the reflector. Hence, in some embodiments, the reflector may be configured downstream of the light generating device. The terms “downstream” and “upstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here especially the light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”. Note that, in embodiments, a combination may be possible as well, i.e., for one reflector module the LED light source may be configured within the internal reflector space, whereas for another reflector module the LED light source may be configured outside of the internal reflector space. Yet additionally or alternatively, in embodiments, the light generating device may comprise more than one LED light source, such that for each reflector module a respective LED light source may be configured on its respective internal light exit window. Hence, in specific embodiments, for the first reflector module a LED light source may be configured on the first internal light exit window and for the second reflector module a LED light source may be configured on the second internal light exit window. Furthermore, in embodiments, the LED light source may be configured to move along with the reflector modules. In such embodiments, when the first and second reflector modules are moved (e.g. rotated) from one of the first reflector configuration and the second reflector configuration to the other one of the first reflector configuration and the second reflector configuration, the LED light source may also move. Hence, in such embodiments, the reflector modules may remain at the same orientation and spatial separation relative to the LED light source. However, in alternative embodiments, the LED light source may also remain static while the first and second reflector modules are moved (e.g. rotated) from one of the first reflector configuration and the second reflector configuration to the other one of the first reflector configuration and the second reflector configuration. Hence, in such embodiments, the reflector modules may rotate relative to the LED light source, such that their orientation and / or spatial separation relative to the LED light source may be changed. Hence, in embodiments the (respective) LED light source(s) may be mechanically coupled to the respective reflector modules, and in other embodiments the respective) LED light source(s) may be mechanically coupled to the connector.

[0014] The reflector may thus be configured in a light-receiving relationship with the light generating device. The phrase “... light received by ...”, and similar phrases, such as “device light received by the reflector” may especially indicate that when the light is actually received by an item, an action may take place. The action may in embodiments be one or more of conversion, reflection, and transmission. Further, the action may also include refraction. Here, in embodiments, the reflector may be reflective for the device light. Hence, in embodiments, the reflector may be configured to reflect at least part of the device light received by the reflector. Especially, in embodiments, reflector may be configured to reflect at least 60%, such as at least 70%, like at least 80%, especially at least 90%, more especially at least 95% of the device light received by the reflector. In some embodiments, the reflector may be configured to reflect at least 98%, such as at least 99%, or even 100% of the device light received by the reflector. Therefore, in embodiments, the reflector may comprise a light reflective material. The term “light reflective material may herein especially refer to a white material or metallic reflective material, i.e., materials which have a relatively high reflection of light. In embodiments, the reflector may be specular reflective, e.g., the reflector may comprise a specular mirror (like a metallic mirror (such as metallic coating)).

[0015] Further, in embodiments, the reflector may comprise a first reflector module and a second reflector module. In some embodiments, the first reflector module and the second reflector module may make up the whole reflector, i.e., the reflector may essentially consist of the first reflector module and the second reflector module. In such embodiments, the first reflector module and the second reflector module may be essentially the same and may thus each constitute half of the reflector. Hence, in some embodiments, the term “first reflector module” may also be referred to as “first reflector half’ and similarly the term “second reflector module” may also be referred to as “second reflector half’. Alternatively, in embodiments, the first reflector module and the second reflector module may be different, e.g., one of the first reflector module and the second reflector module may be larger (i.e., constituting more than half of the reflector) than the other. However, in yet alternative embodiments, the reflector may comprise additional modules, e.g., the reflector may comprise the first reflector module, the second reflector module, and a third reflector module (and optionally even a fourth reflector module, etc.). The first reflector module may, in embodiments, approximate essentially any shape. Especially, in embodiments, the first reflector module may approximate one of the shapes selected from the group comprising: a semi-cylinder, a semi-sphere, a half cone, a prism, a parallelepiped, a pyramid, a wedge, and an ellipsoid. The term “approximate” and its conjugations herein, such as in “to approximate a shape”, may refer to being nearly identical to, especially identical to, the following term, for example nearly identical to a cone or a semi-cylindrical shape. For example, a reflector module may define a semi-cylindrical shape but for a defect. In particular, an object approximating a first shape may herein refer to: a first shape realization encompassing the object, wherein the first shape realization is defined as the smallest encompassing shape of the (2D or 3D, respectively) object wherein the first shape realization has the shape of the first shape, wherein a ratio of the area (volume) of the first shape realization to the area (volume) of the object may be < 1.2, especially < 1.1, such as <1.05, especially <1.02. For instance, a reflector module may approximate a semi- cylindrical shape, wherein the first shape realization may be defined as the smallest encompassing semi -cylindrical shape of the reflector module, wherein a ratio of the volume of the first shape realization to the volume of the reflector module is < 1.2, especially, especially < 1.1, such as <1.05, especially <1.02, including 1. Further, if the dimensions of the first shape are defined, the term approximate may refer to the object and the first shape being superimposable (in 2D or 3D, respectively) such that an intersection between the object and the first shape covers at least n% of the object and at least n% of the shape, wherein n is at least 90%, such as at least 95%, especially at least 98%, such as at least 99%, including 100%. Especially, in embodiments, the first reflector module may comprise a first end part, a first reflector wall, a first internal light exit window, and a first external light exit window. The aforementioned parts may together define the shape of the first reflector module. Further, in embodiments, the first reflector module may comprise a hollow body, e.g., the first reflector wall may comprise a reflective material or a reflective film configured to provide reflection of the device light. Alternatively, in embodiments, the first reflector module may comprise a substantially solid body, especially a solid light transparent body. For example, in embodiments, the first reflector module may comprise a total internal reflection lens. In embodiments, the solid body may comprise one or more materials selected from the group comprising a glass, a polymeric material, a metal(lic) material, and a ceramic material. For example, in embodiments, the solid body may comprise a ceramic body. In another example, the solid body may comprise a glass body, or a polymeric body Similarly to the first reflector module, in embodiments, the second reflector module may approximate essentially any shape. Especially, in embodiments, the first reflector module may approximate one of the shapes selected from the group comprising: a semi-cylinder, a semi-sphere, a half cone, a prism, a parallelepiped, a pyramid, a wedge, and an ellipsoid. In embodiments, the first reflector module and the second reflector module may have essentially the same shape. However, in alternative embodiments, the first reflector module and the second reflector module may have a different shape. In embodiments, the second reflector module may also comprise a second end part, a second reflector wall, a second internal light exit window, and a second external light exit window. The aforementioned parts may together define the shape of the first reflector module. Further, in embodiments, the second reflector module may comprise a hollow body, e.g., the second reflector wall may comprise a reflective material or a reflective film configured to provide reflection of the device light. Hence, in some embodiments, the first reflector module and the second reflector module may both comprise hollow bodies. In such embodiments, the reflector may essentially be a hollow reflector. Alternatively, in embodiments, the second reflector module may comprise a substantially solid body, especially a solid light transparent body. For example, in embodiments, the second reflector module may comprise a total internal reflection lens. In specific embodiments, each of the reflector modules may comprise a solid light transparent body. In such embodiments, the reflector may essentially be a substantially solid reflector, such as e.g., a total internal reflector. However, in alternative embodiments, one of the first reflector module and the second reflector module may comprise a hollow body, whereas the other one of the first reflector module and the second reflector module may comprise a solid light transparent body.

[0016] The abovementioned light exit windows may, in embodiments, be configured to transmit device light emitted from the light generating device. In embodiments, the lighting arrangement may be configured to generate arrangement light. The arrangement light may, in embodiments, comprise at least part of the device light. In specific embodiments, the arrangement light may comprise essentially all of the device light. In some embodiments, the arrangement light may essentially consist of the device light. However, it is herein not excluded that the arrangement light may comprise other types of light, such as e.g., light propagating from external of the lighting unit to the reflector walls and being reflected out of the lighting unit again. In some embodiments, the arrangement light may be transmitted (solely) through one or more of the first external light exit window and the second external light exit window. In other embodiments, the arrangement light may be transmitted through any one or more of the internal light exit windows and the external light exit windows.

[0017] The lighting arrangement may especially, in embodiments, be configured to provide a beam of arrangement light. In embodiments, the beam of arrangement light may have, when illuminating a surface perpendicular to the optical axis (O), provide a spot of arrangement light having essentially any shape, such as e.g., a circular shape, an oval shape, etc... The spot of arrangement light may especially have an aspect ratio, i.e., a proportional ratio between a (maximum) width and a (maximum) height of the spot of arrangement light. In embodiments, in the first reflector configuration the spot of arrangement light may have a first aspect ratio. Further, in embodiments, in the second reflector configuration the spot of arrangement light may have a second aspect ratio larger than the first aspect ratio (in at least one direction). For example, in embodiments, in the first reflector configuration the spot of arrangement light may have a first aspect ratio of 1 : 1 (e.g. the spot may have a circular shape), whereas in the second reflector configuration the spot of arrangement light may have a second aspect ratio of 3:2 (e.g. the spot may have an oval shape).

[0018] In embodiments, the first internal light exit window, the second internal light exit window, the first external light exit window, and the second external light exit window may simply refer to an opening in the respective reflector module. Alternatively, in embodiment, one or more of the first internal light exit window, the second internal light exit window, the first external light exit window, and the second external light exit window may comprise a material window, such as e.g. a glass window. Especially, in embodiments, one or more of the first internal light exit window, the second internal light exit window, the first external light exit window, and the second external light exit window may comprise a light- transmissive material. Furthermore, in embodiments, the first internal light exit window, the second internal light exit window, the first external light exit window, and the second external light exit window may comprise an optical element. Especially, in embodiments, the optical element may be individually selected from the group comprising: a light transmissive structure, a light translucent structure, a light reflective structure, a light scattering structure, and a light refractive structure. For example, in embodiments, one or more of the first internal light exit window, the second internal light exit window, the first external light exit window, and the second external light exit window may comprise a glass or polymeric plate. Especially, in embodiments, the optical element (such as the glass or polymeric plate) may be patterned in relief. In embodiments, especially one or more of the first internal light exit window and the second internal light exit window may comprise the optical element. The optical element may, in embodiments, be configured to redirect (along the optical axis (O) the device light escaping from the reflector. Additionally or alternatively, in embodiments, the optical element may be configured to beam shape the device light escaping from the reflector. Hence, in specific embodiments, one or more of the first internal light exit window and the second internal light exit window may comprise an optical element, wherein the optical element may comprise one or more of a refractive structure and a reflective structure, wherein the optical element may be configured to redirect (along the optical axis (O)) and / or beam shape the device light. Such embodiments may especially be beneficial as the optical element may provide further adjustability of the beam of device light escaping the lighting arrangement. Especially, the optical element may enable increasing or decreasing the size of the beam of device light escaping the lighting arrangement. Furthermore, the optical element may help reduce glare of the beam of device light escaping the lighting arrangement. Herein, the term “optical element” may also refer to a plurality of optical elements.

[0019] Further, in embodiments, the connector may be configured to (directly and / or indirectly) physically connect the first reflector module and the second reflector module. Especially, in embodiments, the connector may be configured to physically connect the first reflector module and the second reflector module by physically connecting the first end part (of the first reflector module) and the second end part (of the second reflector module). In embodiments, the first end part (of the first reflector module) and the second end part (of the second reflector module) may be glued together, i.e., the connector may comprise a glue. Additionally or alternatively, the first end part (of the first reflector module) and the second end part (of the second reflector module) may be physically connected through one or more of screws, nuts and bolts, clamps, complementing male and female connector parts etc. Therefore, in embodiments, the connector may for example comprise one or more of screws, nuts and bolts, clamps, male and female connector parts etc. The connector may especially, in embodiments, be configured to support both the first reflector module and the second reflector module. Hence, in embodiments, the connector may be configured to support the reflector.

[0020] In embodiments, the first reflector module and the second reflector module may be configurable in different (spatial) reflector configurations. Such different (spatial) reflector configurations may especially lead to different beams of device light escaping from the lighting unit, see also further below. In particular, in embodiments, the lighting unit may comprise a first reflector configuration (of the reflector modules) and a second reflector configuration (of the reflector modules). The different reflector configurations are described in more detail further below.

[0021] As indicated above, the reflector modules may each comprise a reflector wall.

[0022] In embodiments, each reflector wall may comprise two wall ends. Hence, the first reflector wall may comprise two first wall ends and the second reflector wall may comprise two second wall ends. Especially, in embodiments, the first wall ends may be configured at the extremes of the first reflector wall where the first reflector wall may contact both the first internal light exit window and the first external light exit window. Similarly, in embodiments, the second wall ends may be configured at the extremes of the second reflector wall where the second reflector wall may contact both the second internal light exit window and the second external light exit window. Conversely, in embodiments, the first end part may be defined at an extreme of the first reflector wall where the first reflector wall may contact the first internal light exit window but not the first external light exit window. Similarly, in embodiments, the second end part may be defined at an extreme of the second reflector wall where the second reflector wall may contact the second internal light exit window but not the second external light exit window. Hence, in embodiments, the first end part may be spatially separated from the first wall ends by the first reflector wall, and analogously the second end part may be spatially separated from the second wall ends by the second reflector wall. Further, in embodiments, the first reflector wall and the first end part may partly coincide, e.g. the first end part may essentially be a part of the first reflector wall. Analogously, in embodiments, the second reflector wall and the second end part may partly coincide, e.g. the second end part may essentially be a part of the second reflector wall.

[0023] In embodiments, a first plane (Pl) may be defined through the first end part and the two first wall ends. Analogously, in embodiments, a second plane (P2) may be defined through the second end part and the two second wall ends. The first plane (Pl) and the second plane (P2) may have a mutual angle (P). In embodiments, the mutual angle (P) may be essentially any angle, e.g. up to 360°. Especially, in embodiments, the mutual angle (P) may be selected from the range of 0-180°, such as from the range of 0-120°, like from the range of 0-90°. Further, in embodiments, the mutual angle (P) may be selected from the range of 10-90°, such as from the range of 15-75°, like from the range of 30-60°. In embodiments, a difference between a largest mutual angle (Pmax) and a smallest mutual angle (pmin) may be selected from the range of 10-180°, such as from the range of 10-90°, like from the range of 15-90°, especially from the range of 30-75°. In the first reflector configuration (of the reflector modules), in embodiments, the first reflector module and the second reflector module may be configured such that the first plane (Pl) and the second plane (P2) may have a first mutual angle (pi). Especially, in embodiments, the first mutual angle (pi) may be selected from the range of 0-30°, such as from the range of 0-15°, like from the range of 1.5-7.5°. In specific embodiments, the first mutual angle (pi) may be essentially zero (0°). Hence, in embodiments, in the first reflector configuration the first plane (Pl) and the second plane (P2) may be configured parallel. Especially, in such embodiments, the arrangement light may be transmitted (solely) through one or more of the first external light exit window and the second external light exit window. Such embodiments may be beneficial as such a configuration may allow a relatively small beam of light to escape from the lighting unit. Hence such embodiments may be beneficial for highlighting a specific spot, such as e.g. highlighting a product in a store.

[0024] In the second reflector configuration (of the reflector modules), in embodiments, the first reflector module and the second reflector module may be configured such that the first plane (Pl) and the second plane (P2) may have a second mutual angle (P2). Especially, in embodiments, the second mutual angle (P2) may be selected from the range of 10-360°, such as from the range of 10-180°, like from the range of 30-120°. Especially, in embodiments, the second mutual angle (P2) may be selected from the range of 15-90°, such as from the range of 15-75°, like from the range of 30-60°, especially from the range of 30- 45°. In specific embodiments, the second mutual angle (P2) may not be zero (0°). As such, in embodiments, device light emitted by the light generating device may exit via the external exit windows and / or the internal exit windows. Especially, in the second reflector configuration, at least part of the arrangement light may be transmitted through the first internal light exit window. Additionally or alternatively, in the second reflector configuration, at least part of the arrangement light may be transmitted through the second internal light exit window. Hence, in specific embodiments, in the second reflector configuration the first plane (Pl) and the second plane (P2) may not be configured parallel, and at least part of the arrangement light may be transmitted through the first internal exit window and the second internal exit window. Such embodiments may be beneficial as such a configuration may allow a larger beam of light to escape from the lighting unit. Hence such embodiments may be beneficial for illuminating a larger area. Furthermore, such embodiments may provide a beam of light having a different shape relative to the first reflector configuration, therewith enabling adjustability of the shape of the beam of arrangement light exiting the lighting arrangement. The connector may thus, in embodiments, be configured to connect the first reflector module and the second reflector module such that the reflector modules may be configured in either the first reflector configuration or the second reflector configuration. Therefore, in embodiments, the connector may comprise a hinge. The hinge may, in embodiments, hingeably connect the first reflector module and the second reflector module. Such embodiments may be beneficial as the hinge may allow adjustability of the first reflector module and the second reflector module relative to each other, therewith allowing different (spatial) reflector configurations. Hence, in specific embodiments, the connector may comprise a hinge, wherein the hinge may hingeably connect the first reflector module and the second reflector module.

[0025] Especially, the reflector modules may be configured hingeable in their different positions (or configurations). That is, the reflector modules may be hingeably associated with other elements such as e.g. each other, the connector, or a lighting track (see also further below). Specifically, the reflector modules may be rotated and / or tilted with respect to each other (or other respective elements). The reflector modules may be hingeable associated by various types of hinging, such as butt hinges, pivot hinges, continuous hinges, piano hinges, concealed hinges, European hinges, etc. Hence, in embodiments, the connector may comprise one or more of butt hinges, pivot hinges, continuous hinges, piano hinges, concealed hinges, European hinges, etc.

[0026] A sideview cross-sectional plane (P) of the lighting arrangement may be defined perpendicular to the first plane (Pl) and the second plane (P2). Furthermore, the lighting arrangement may have a main axis (A) defined parallel to the sideview cross- sectional plane (P) and intersecting with the connector. In some embodiments, the main axis (A) may coincide with the optical axis (O) as defined above. Especially, in embodiments, in the first reflector configuration of the lighting arrangement the main axis (A) and the optical axis (O) may coincide. However, in alternative embodiments, the optical axis (O) may have not coincide with (e.g. have an angle relative to) the main axis (A). As described above, the first plane (Pl) and the second plane (P2) may have a mutual angle (P). Further, in embodiments, the first plane (Pl) may have a first angle (al) relative to the main axis (A). In embodiments, the first angle (al) may be selected from the range of 0-180°. Especially, in embodiments, the first angle (al) may be selected from the range of <90°, such as from the range of <60°, like from the range of <45°, especially from the range of <30°. Similarly, in embodiments, the second plane (P2) may have a second angle (a2) relative to the main axis (A). In embodiments, the second angle (a2) may be selected from the range of 0-180°. Especially, in embodiments, the second angle (a2) may be selected from the range of <90°, such as from the range of <60°, like from the range of <45°, especially from the range of <30°.

[0027] In the first reflector configuration, in embodiments, the first plane (Pl) and the second plane (P2) may both be configured essentially parallel to the main axis (A).

[0028] Especially, in such embodiments, the first angle (al) and the second angle (a2) may both be (individually) selected from the range of at most 5°, such as at most 2°. In specific embodiments, the first angle (al) and the second angle (a2) may both be essentially 0°. Conversely, in the second reflector configuration, in embodiments, at least one of the first plane (Pl) and the second plane (P2) may not be configured parallel to the main axis (A). Especially, in such embodiments, at least one of the first angle (al) and the second angle (a2) may be (individually) selected from the range of at least 5°, such as at least 10°. In some embodiments, the first angle (al) and the second angle (a2) may be essentially the same angle, such as e.g. al=a2=15°. In alternative embodiments, the first angle (al) and the second angle (a2) may be different, such as e.g. al=0° and a2=20°, or such as e.g. al=15° and a2=10°.

[0029] As mentioned above, in embodiments, the reflector modules may have various shapes. In some embodiments, the first reflector module and the second reflector module may have essentially the same shape. Hence, in some embodiments, the first reflector wall and the second reflector wall may have essentially the same shape. In embodiments, the first reflector module may have a shape approximating a half cone. A first cross-sectional plane may be defined perpendicular to the first plane (Pl), such that the first reflector wall (as seen in the first cross-sectional plane) may have (a shape approximating) a semi-parabolic shape (or “half of a parabolic shape”). Additionally or alternatively, in embodiments, the second reflector module may have a shape approximating a half cone. A second cross-sectional plane may be defined perpendicular to the second plane (P2), such that the second reflector wall (as seen in the second cross-sectional plane) may have (a shape approximating) a semi-parabolic (or half of a parabolic) shape. Hence, in embodiments, one or more of the following may apply: (a) in a first cross-sectional plane defined perpendicular to the first plane (Pl) the first reflector wall may have (a shape approximating) a semi-parabolic shape, and (b) in a second cross-sectional plane defined perpendicular to the second plane (P2) the second reflector wall may have (a shape approximating) a semi-parabolic shape. Especially, in embodiments, the first reflector wall (as seen in the first cross-sectional plane) and the second reflector wall (as seen in the second cross-sectional plane) may have the same semi-parabolic shape. Hence, in embodiments, the first reflector wall and the second reflector wall may be mirror images of each other. As such, in at least one of the (spatial) reflector configurations (especially in the first reflector configuration wherein 1=0°), the reflector may have a shape approximating a rounded cone. Such embodiments may be beneficial as a the rounded shape may reduce bulk around the connector, therewith improving the hingeability of the reflector modules relative to each other (and / or to other elements).

[0030] In embodiments, the reflector may comprise a plurality of reflector modules, such as three or more reflector modules, especially four or more reflector modules. The plurality of reflector modules may, in embodiments, have different shapes. However, in some embodiments, the plurality of reflector modules may each have essentially the same shape. For example, in embodiments, the plurality of reflector modules may each have (as seen in their respective cross-sectional plane) a semi-parabolic (or half of a parabolic) shape. Especially, in embodiments, (the plurality of) reflector modules may each comprise a parabolic mirror. In such embodiments, the reflector may essentially comprise, in at least one of the (spatial) reflector configurations (especially the first reflector configuration), a compound parabolic concentrator. Especially, in embodiments, the reflector may comprise a compound parabolic concentrator when the reflector modules are configured in at least one configuration having at least one of the above defined possible values for the mutual angle 0. In embodiments where the reflector comprises four reflector modules having a semiparabolic (or half of a parabolic) shape, the reflector may essentially comprise a squared (or crossed) compound parabolic concentrator. Additionally or alternatively, in embodiments where the reflector comprises a plurality of reflector modules, having a semi-parabolic (or half of a parabolic) shape, the reflector may essentially comprise a multi-facetted compound parabolic concentrator. In such embodiments, the reflector may comprise n reflector modules, (especially having a semi-parabolic (or half of a parabolic) shape, i.e., n facets), wherein n may be selected from the range of >2, such as from the range of >4, like from the range of >6. Hence, in embodiments, the reflector may comprise a (crossed / square shaped) compound parabolic concentrator (in at least one of the (spatial) reflector configurations).

[0031] Further, in at least one of the (spatial) reflector configurations one of the first reflector module and the second reflector module may be configured to host at least part of the other one of the first reflector module and the second reflector module. Herein, the phrase “configured to host” and similar phrases may refer to an element being configured to accommodate a second element, e.g. such that the first element may essentially comprise or house at least part of the second element. In specific embodiments, at least one of the first reflector module and the second reflector module may be configured to host at least part of the other when the reflector modules are configured in at least one configuration having at least one of the above defined possible values for the mutual angle p. Furthermore, in embodiments, at least one of the first reflector module and the second reflector module may be configured to host at least part of the other, such that their respective reflector walls may overlap in at least one direction perpendicular to the main axis. Especially, in such embodiments, the amount of overlap between the first reflector wall and the second reflector wall may be largest in a reflector configuration corresponding to the smallest mutual angle (Pmin). Conversely, in such embodiments, the amount of overlap between the first reflector wall and the second reflector wall may be smallest in a reflector configuration corresponding to the largest mutual angle (Pmax). In embodiments, one or more virtual vectors (V) may be defined parallel to at least one of the first plane (Pl) and the second plane (P2), and extending from a plane perpendicular to (both) the first plane (Pl) and the second plane (P2). Hence, in at least one of the (spatial) reflector configurations (especially the first reflector configuration), in embodiments, one of the first reflector module and the second reflector module may be configured to host at least part of the other one of the first reflector module and the second reflector module, such that one or more of the virtual vectors (V ) may intersect with both the first reflector wall and the second reflector wall. In some embodiments, the reflector modules may be configured such that a virtual vector (V) extending from the plane perpendicular to (both) the first plane (Pl) and the second plane (P2) may first intersect the first reflector wall and then the second reflector wall, or vice versa. In other embodiments, the reflector modules may be configured such that more than one, or even each, virtual vector (V) extending from the plane perpendicular to (both) the first plane (Pl) and the second plane (P2) may (each) first intersect the first reflector wall and then the second reflector wall. Hence, in such embodiments, the second reflector module may host at least part of the first reflector module. Alternatively, in embodiments, the reflector modules may be configured such that more than one, or even each, virtual vector (V) extending from the plane perpendicular to (both) the first plane (Pl) and the second plane (P2) may (each) first intersect the second reflector wall and then the first reflector wall. Hence, in such embodiments, the first reflector module may host at least part of the second reflector module. In yet other embodiments, the reflector modules may be configured such that (i) a first virtual vector (Vi) extending from the plane perpendicular to (both) the first plane (Pl) and the second plane (P2) may first intersect the first reflector wall and then the second reflector wall, and (ii) a second virtual vector (Vii) extending from the plane perpendicular to (both) the first plane (Pl) and the second plane (P2) (in a direction perpendicular to the first virtual vector (Vi)) may first intersect the second reflector wall and then the first reflector wall. Hence, in such embodiments, the first reflector module and the second reflector module may both host at least part of the respective other reflector module. Hence, in embodiments, in at least one of the (spatial) reflector configurations one of the first reflector module and the second reflector module may be configured to host at least part of the other one of the first reflector module and the second reflector module, such that one or more virtual vectors (V) parallel to at least one of the first plane (Pl) and the second plane (P2), and extending from a plane perpendicular to the first plane (Pl) and the second plane (P2), may intersect with both the first reflector wall and the second reflector wall. Such embodiments may be beneficial as the lighting unit as a whole may become more compact if the reflector modules may partially host each other. Furthermore, if in the first (spatial) reflector configuration one of the reflector modules hosts the other as described above, then the reflector wall of one reflector module may thus extend (slightly) past the respective first or second planes (P1,P2). If the first and second reflector wall substantially align a gap or opening would appear when the reflector is adjusted from the first to the second (spatial) reflector configuration. Such a gap or opening would allow for light to pass in a potentially undesirable direction. Hence, such embodiments where one reflector wall may extend may be beneficial as the extension may provide a (reflective) cover for the gap or opening that may appear when the reflector is adjusted to the second (spatial) reflector configuration, therewith preventing loss of light.

[0032] In the second reflector configuration of the lighting arrangement, in embodiments, a gap or opening may thus be present between the first reflector module and the second reflector module. In embodiments, the gap or opening may be defined by a distance in the sideview cross-sectional plane of the lighting arrangement. Especially, in embodiments, in the sideview cross-sectional plane of the lighting arrangement (as defined above), a first shortest distance (dl) may be defined between one of the first wall ends (of the first reflector wall) and one of the second wall ends (of the second reflector wall). In embodiments, in the first reflector configuration of the lighting arrangement, the first shortest distance (dl) may be at most 8 cm, such as at most 5 cm, like at most 2 cm, especially at most 1 cm. Especially, in embodiments, in the first reflector configuration of the lighting arrangement, the first shortest distance (dl) may be essentially zero, i.e., the first reflector module and the second reflector module may be configured in a closed configuration. However, in embodiments where for example the first reflector wall and the second reflector wall may overlap (see also above), the first shortest distance (dl) may be selected from the range of 1-8 cm, such as from the range of 1-5 cm, especially from the range of <4 cm. In embodiments, in the second reflector configuration of the lighting arrangement, the first shortest distance (dl) may be selected from the range of 2-40 cm, such as from the range of 3-25 cm, like at from the range of 5-20 cm, especially at from the range of 5-15 cm. Especially, in embodiments, in the second reflector configuration of the lighting arrangement, the first shortest distance (dl) may not be zero, i.e., the first reflector module and the second reflector module may be configured in an open configuration. Hence, in embodiments, in a sideview cross-sectional plane of the lighting arrangement (defined perpendicular to the first plane (Pl) and the second plane (P2)) in the second reflector configuration (of the lighting arrangement) a first shortest distance (dl) may be defined between one of the first wall ends and one of the second wall ends, and wherein in the second reflector configuration the first shortest distance (dl) may be selected from the range of 5-20 cm.

[0033] A first shortest distance (dl) may thus be defined for the reflector. In embodiments, the reflector may further have a height (h) defined parallel to the main axis (A). In embodiments, the height (h) may especially be selected from the range of >5 cm, such as from the range of >10 cm, like from the range of >15 cm. Further, in embodiments, the height (h) may be selected from the range of <100 cm, such as from the range of <75 cm, like from the range of <50 cm, especially from the range of <30 cm. Furthermore, in embodiments, the reflector may have a maximum width (d2) defined perpendicular to the height (h). In embodiments, the maximum width (d2) may be selected from the range of >2 cm, such as from the range of >5 cm, like from the range of >7 cm. Further, in embodiments, the maximum width (d2) may be selected from the range of dl<d2<100 cm, such as from the range of dl<d2<75 cm, like from the range of 1.2*dl<d2<50 cm. Hence, in some (especially most) embodiments, the maximum width (d2) may be larger than the shortest distance (dl).

[0034] The reflector may thus be configured in different reflector configurations, and hence the reflector modules may be configured movable relative to each other. It may be desirable to (temporarily) lock one or more of the reflector modules such that the lighting arrangement may operate in one of the first reflector configuration and the second reflector configuration for a period of time. Therefore, in embodiments, the lighting unit may comprise a locking element. In embodiments, the locking element may be configured to lock at least one of the (spatial) reflector configurations of the reflector modules. Herein, the term “to lock” or “locking” or similar terms may refer to fastening or securing the object being locked, such that motion is restricted. The locking element may, in embodiments, be applied to either temporarily lock an object into place, or even to permanently lock an object into place. In embodiments, the locking element may be configured to (temporarily) lock one or more of the reflector modules relative to each other. Additionally or alternatively, the locking element may, in embodiments, be configured to one or more of the reflector modules relative to the connector. Therefore, the locking element may, in embodiments, comprise one or more of the group comprising a screw, a nut and bolt, a clamp, a click pin, and complementing male and female locking parts. Hence, in embodiments, the lighting unit may comprise a locking element configured to (temporarily) lock at least one of the (spatial) reflector configurations of the reflector modules.

[0035] As indicated above, the lighting arrangement comprises a light generating device. A light generating device may especially be configured to generate device light. Especially, the light generating device may comprise a light source. The light source may especially configured to generate light source light. In embodiments, the device light may essentially consist of the device light. In other embodiments, the device light may essentially consist of converted light source light. In yet other embodiments, the device light may comprise (unconverted) light source light and converted light source light. Light source light may be converted with a luminescent material into luminescent material light and / or with an upconverter into upconverted light.

[0036] The term “light source” may in principle relate to any light source known in the art. It may be a conventional (tungsten) light bulb, a low pressure mercury lamp, a high pressure mercury lamp, a fluorescent lamp, an LED (light emissive diode). In a specific embodiment, the light source comprises a solid state LED light source (such as an LED or laser diode (or “diode laser”)). The term “light source” may also relate to a plurality of light sources, such as 2-2000 (solid state) LED light sources. Hence, the term LED may also refer to a plurality of LEDs. Further, the term “light source” may in embodiments also refer to a so-called chips-on-board (COB) light source. The term “COB” especially refers to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of light emitting semiconductor light source may be configured on the same substrate. In embodiments, a COB is a multi LED chip configured together as a single lighting module. The term “light source” may also refer to a chip scaled package (CSP). A CSP may comprise a single solid state die with provided thereon a luminescent material comprising layer. The term “light source” may also refer to a midpower package. A midpower package may comprise one or more solid state die(s). The die(s) may be covered by a luminescent material comprising layer. The die dimensions may be equal to or smaller than 2 mm, such as in the range of e.g. 0.2-2 mm. Hence, in embodiments the light source comprises a solid state light source. Further, in specific embodiments, the light source comprises a chip scale packaged LED. Herein, the term “light source” may also especially refer to a small solid state light source, such as having a mini size or micro size. For instance, the light sources may comprise one or more of mini LEDs and micro LEDs. Especially, in embodiment the light sources comprise micro LEDs or “microLEDs” or “pLEDs”. Herein, the term mini size or mini LED especially indicates to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm - 1 mm. Herein, the term p size or micro LED especially indicates to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm and smaller.

[0037] The light source may have a light escape surface. Referring to conventional light sources such as light bulbs or fluorescent lamps, it may be an outer surface of a glass or a quartz envelope. For LED’s it may for instance be the LED die, or when a resin is applied to the LED die, the outer surface of the resin. In principle, it may also be the terminal end of a fiber. The term escape surface especially relates to that part of the light source, where the light actually leaves or escapes from the light source. The light source is configured to provide a beam of light. This beam of light (thus) escapes from the light exit surface of the light source. Likewise, a light generating device may comprise a light escape surface, such as an end window.

[0038] The term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In a specific embodiment, the light source comprises a solid-state light source (such as an LED or laser diode). In an embodiment, the light source comprises an LED (light emitting diode). The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). In embodiments, the light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, such as an LED, or downstream of a plurality of solid- state light sources (i.e. e.g. shared by multiple LEDs). In embodiments, the light source may comprise an LED with on-chip optics. In embodiments, the light source comprises pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering). In embodiments, the light source may be configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED, or a green light source, such as a green LED, and a red light source, such as a red LED. Such LEDs, which may not comprise a luminescent material (“phosphor”) may be indicated as direct color LEDs. In other embodiments, however, the light source may be configured to provide primary radiation and part of the primary radiation is converted into secondary radiation. Secondary radiation may be based on conversion by a luminescent material. The secondary radiation may therefore also be indicated as luminescent material radiation. The luminescent material may in embodiments be comprised by the light source, such as an LED with a luminescent material layer or dome comprising luminescent material. Such LEDs may be indicated as phosphor converted LEDs or PC LEDs (phosphor converted LEDs). In other embodiments, the luminescent material may be configured at some distance (“remote”) from the light source, such as an LED with a luminescent material layer not in physical contact with a die of the LED. Hence, in specific embodiments the light source may be a light source that during operation emits at least light at wavelength selected from the range of 380-470 nm. However, other wavelengths may also be possible. This light may partially be used by the luminescent material.

[0039] In embodiments, the light generating device may comprise a luminescent material. In embodiments, the light generating device may comprise a PC LED. In other embodiments, the light generating device may comprise a direct LED (i.e. no phosphor). In embodiments, the light generating device may comprise a laser device, like a laser diode. In embodiments, the light generating device may comprise a superluminescent diode. Hence, in specific embodiments, the light source may be selected from the group of laser diodes and superluminescent diodes. In other embodiments, the light source may comprise an LED.

[0040] The light source may especially be configured to generate light source light having an optical axis (O), (a beam shape,) and a spectral power distribution. The light source light may in embodiments comprise one or more bands, e.g. having band widths as known for lasers.

[0041] The term “light source” may (thus) refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more of a luminescent material comprising element and (other) optics, like a lens, a collimator. A light converter element (“converter element” or “converter”) may comprise a luminescent material comprising element. For instance, a solid state light source as such, like a blue LED, is a light source. A combination of a solid state light source (as light generating element) and a light converter element, such as a blue LED and a light converter element, optically coupled to the solid state light source, may also be a light source (but may also be indicated as light generating device). Hence, a white LED is a light source (but may e.g. also be indicated as (white) light generating device).

[0042] The term “light source” herein may also refer to a light source comprising a solid state light source, such as an LED or a laser diode or a superluminescent diode. The term “light source” may (thus) in embodiments also refer to a light source that is (also) based on conversion of light, such as a light source in combination with a luminescent converter material. Hence, the term “light source” may also refer to a combination of an LED with a luminescent material configured to convert at least part of the LED radiation, or to a combination of a (diode) laser with a luminescent material configured to convert at least part of the (diode) laser radiation. In embodiments, the term “light source” may also refer to a combination of a light source, like an LED, and an optical filter, which may change the spectral power distribution of the light generated by the light source. Especially, the term “light generating device” may be used to address a light source and further (optical components), like an optical filter and / or a beam shaping element, etc.

[0043] The phrases “different light sources” or “a plurality of different light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from at least two different bins. Likewise, the phrases “identical light sources” or “a plurality of same light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from the same bin.

[0044] The term “solid state light source”, or “solid state material light source”, and similar terms, may especially refer to semiconductor light sources, such as a light emitting diode (LED), a diode laser, or a superluminescent diode.

[0045] The term “laser light source” especially refers to a laser. Such laser may especially be configured to generate laser light source light having one or more wavelengths in the UV, visible, or infrared, especially having a wavelength selected from the spectral wavelength range of 200-2000 nm, such as 300-1500 nm. The term “laser” especially refers to a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Especially, in embodiments the term “laser” may refer to a solid-state laser. In specific embodiments, the terms “laser” or “laser light source”, or similar terms, refer to a laser diode (or diode laser).

[0046] A laser may be combined with an upconverter in order to arrive at shorter (laser) wavelengths. For instance, with some (trivalent) rare earth ions upconversion may be obtained or with non-linear crystals upconversion can be obtained. Alternatively, a laser can be combined with a downconverter, such as a dye laser, to arrive at longer (laser) wavelengths. The term “solid state material laser”, and similar terms, may refer to a solid state laser like based on a crystalline or glass body doped with ions, like transition metal ions and / or lanthanide ions, to a fiber laser, to a photonic crystal laser, to a semiconductor laser, such as e.g. a vertical cavity surface-emitting laser (VCSEL), etc.

[0047] The term “solid state light source”, and similar terms, may especially refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, or a superluminescent diode. Instead of the term “solid state light source” also the term “semiconductor-based light source” may be applied. Hence, the term “semiconductor-based light source” may e.g. refer to one or more of a light emitting diode (LED), a laser diode, and a superluminescent diode. Hence, the light generating device may comprise one or more of a light emitting diode (LED), a laser diode, and a superluminescent diode.

[0048] A light-emitting diode (LED) is especially a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor may recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) may be determined by the energy required for electrons to cross the band gap of the semiconductor.

[0049] A laser diode (or diode laser) may be a semiconductor device substantially similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode’s junction. This is known to a person skilled in the art.

[0050] Superluminescent diodes are known in the art. A superluminescent diode may be indicated as a semiconductor device which may be able to emit low-coherence light of a broad spectrum like an LED, while having a brightness in the order of a laser diode. Further, an SLD may especially be a semiconductor light source, where spontaneous emission light is amplified by stimulated emission in the active region of the device. Such emission is called “super luminescence”. Superluminescent diodes combine the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes. The low (temporal) coherence of the source has advantages that the speckle is significantly reduced or not visible, and the spectral distribution of emission is much broader compared to laser diodes, which can be better suited for lighting applications. Especially, with varying electrical current, the spectral power distribution of the superluminescent diode may vary. In this way the spectral power distribution can be controlled, see e.g. also Abdullah A. Alatawi, et al., Optics Express Vol. 26, Issue 20, pp. 26355-26364, https: / / doi.org / 10.1364 / QE.26.026355. Hence, a superluminescent diode may be indicated as a semiconductor device which may be able to emit low-coherence light of a broad spectrum like a LED, while having a brightness in the order of a laser diode. Superluminescent diodes may combine the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes. The low (temporal) coherence of the source has advantages that the speckle is significantly reduced or not visible, and the spectral distribution of emission is much broader compared to laser diodes, which can be better suited for lighting applications. Hence, in embodiments, the solid state light source may comprise a superluminescent diode. For instance, in further specific embodiments, the solid state light source may comprise a GaN-based superluminescent diode, or an InGaN-based superluminescent diode, or an AlGaN-based superluminescent diode.

[0051] The lighting arrangement may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting. The lighting arrangement (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems.

[0052] In embodiments, the arrangement light may be white light. In embodiments, white arrangement light may be provided, for example, using a light generating device comprising a blue LED and a (yellow) luminescent converter, see also further above. Alternatively, in embodiments, white arrangement light may be provided using multiple light generating devices, e.g. a blue light generating device and a yellow light generating device. The arrangement light may especially, in embodiments, be white light having a color rendering index of at least 70, such as at least 80. Additionally or alternatively, in embodiments, the arrangement light may be white light having a correlated color temperature selected from the range of 2700-8000 K, such as from the range of 3000-6500 K.

[0053] The term “white light”, and similar terms, herein, is known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1800 K and 20000 K, such as between 2000 and 20000 K, especially 2700- 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700 K and 6500 K. In embodiments, e.g. for backlighting purposes, or for other purposes, the correlated color temperature (CCT) may especially be in the range of about 7000 K and 20000 K. Yet further, in embodiments the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL. In specific embodiments, the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, like selected from the range of 7000-12000 K, like at least 8000 K. Yet further, in embodiments the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, like selected from the range of 7000-12000 K, in combination with a CRI of at least 70.

[0054] In an embodiment, the light generating device may also provide device light having a correlated color temperature (CCT) between about 5000 and 20000 K, e.g. direct phosphor converted LEDs (blue light emitting diode with thin layer of phosphor for e.g. obtaining of 10000 K). Hence, in a specific embodiment the light generating device is configured to provide device light with a correlated color temperature in the range of 5000- 20000 K, even more especially in the range of 6000-20000 K, such as 8000-20000 K. An advantage of the relative high color temperature may be that there may be a relatively high blue component in the light source light.

[0055] In embodiments, the arrangement light may (also) be colored light. In embodiments, colored arrangement light may be provided, for example, using a light generating device configured to generate light having a wavelength in the visible wavelength range. Hence, in embodiments, the arrangement light may be colored light having a wavelength selected from the visible wavelength range. Additionally or alternatively, in embodiments, the arrangement light may be light having a wavelength selected from the UV wavelength range. Additionally or alternatively, in embodiments, the arrangement light may be light having a wavelength selected from the IR wavelength range.

[0056] The terms “visible”, “visible light” or “visible emission” and similar terms refer to light having one or more wavelengths in the range of about 380-780 nm. Herein, UV may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm. Herein, IR (infrared) may especially refer to radiation having a wavelength selected from the range of 780-3000 nm, such as 780-2000 nm, e.g. a wavelength up to about 1500 nm, like a wavelength of at least 900 nm, though in specific embodiments other wavelengths may also be possible. The terms “light” and “radiation” are herein interchangeably used, unless clear from the context that the term “light” only refers to visible light. The terms “light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light.

[0057] Further, in embodiments, the lighting arrangement may comprise a control system. In embodiments, the control system may be configured to control spectral properties of the lighting arrangement, such as e.g. a correlated color temperature or a spectral power distribution of the arrangement light. The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein “controlling” and similar terms may e.g. refer to imposing behavior to the element (determining the behavior or supervising the running of an element), etc., such as e.g. measuring, displaying, actuating, opening, shifting, changing temperature, etc.. Beyond that, the term “controlling” and similar terms may additionally include monitoring. Hence, the term “controlling” and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element. The controlling of the element can be done with a control system, which may also be indicated as “controller”. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and / or wireless control. The term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems. A control system may comprise or may be functionally coupled to a user interface. The control system may also be configured to receive and execute instructions from a remote control. In embodiments, the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I-phone, a tablet, etc.. The device is thus not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system. Hence, in embodiments the control system may (also) be configured to be controlled by an App on a remote device. In such embodiments the control system of the lighting system may be a slave control system or control in a slave mode. For instance, the lighting system may be identifiable with a code, especially a unique code for the respective lighting system. The control system of the lighting system may be configured to be controlled by an external control system which has access to the lighting system on the basis of knowledge (input by a user interface of with an optical sensor (e.g. QR code reader) of the (unique) code. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology.

[0058] The system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation” or “operational mode”. The term “operational mode may also be indicated as “controlling mode”. Likewise, in a method an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation” or “operational mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and / or after executing the mode one or more other modes may be executed. However, in embodiments a control system may be available, that is adapted to provide at least the controlling mode. Would other modes be available, the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible. The operation mode may in embodiments also refer to a system, or apparatus, or device, that can only operate in a single operation mode (i.e. “on”, without further tunability). Hence, in embodiments, the control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme.

[0059] In yet a further aspect, the invention also provides a lamp or a luminaire comprising the lighting arrangement as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc. etc... The lamp or luminaire may further comprise a housing enclosing the lighting arrangement. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the arrangement light may escape from the housing. In yet a further aspect, the invention also provides a projection device comprising the lighting arrangement as defined herein. Especially, a projection device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projection device may include one or more lighting arrangement such as described herein. Hence, in an aspect the invention also provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the lighting arrangement as defined herein. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the lighting arrangement. For instance, in embodiments the lighting device may comprise a housing or a carrier, configured to house or support one or more of the reflector and the light generating device. In embodiments, the lighting device, especially the lamp or luminaire, may comprise one lighting arrangement. Alternatively, in embodiments, the lighting device, especially the lamp or luminaire, may comprise a plurality of lighting arrangements. Instead of the terms “lighting device” or “lighting system”, and similar terms, also the terms “light generating device” or “light generating system”, (and similar terms), may be applied. A lighting device or a lighting system may be configured to generate device light (or “lighting device light”) or system light (“or lighting system light”). As indicated above, the terms light and radiation may interchangeably be used.

[0060] In a yet further aspect, the invention may provide a track lighting system comprising one or more lighting devices as described above. Especially, in embodiments, the track lighting system may comprise one or more lamps. Additionally or alternatively, the track lighting system may comprise one or more luminaires. Further, in embodiments, the track lighting system may comprise an elongated track. The elongated track may especially be configured to electrically and / or mechanically connect the connectors (of the lighting devices) to a power source. In a yet further aspect, the invention may provide a method for illuminating a part of a space. In embodiments, the method may comprise providing the lighting arrangement as described herein. Especially, in embodiments, the method may comprise mounting the lighting arrangement and configuring the lighting arrangement in one of the reflector configurations dependent on the part of the space desired to be illuminated. Further, the method may comprise electrically connecting the lighting arrangement, especially the light generating device, to a power source, such that the (desired) part of the space is illuminated with arrangement light.

[0061] BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:

[0063] Figs. 1 A-1C schematically depict a lighting arrangement.

[0064] Figs. 2A-2B schematically depict a lighting arrangement. Figs. 3 A-3D schematically depict a lighting arrangement. Figs. 4A-4D schematically depict a lighting arrangement.

[0065] Figs. 5A-5B schematically depict a track lighting system comprising a lighting arrangement.

[0066] Fig. 6 schematically depicts further applications of a lighting arrangement. The schematic drawings are not necessarily to scale.

[0067] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0068] Fig. 1 schematically depicts embodiments of the lighting arrangement 1000 of the invention. As depicted, the lighting arrangement 1000 may comprise a lighting unit 1500. In embodiments, the lighting unit 1500 may comprise a light generating device 100, a reflector 200, and a connector 400.

[0069] In embodiments, the light generating device 100 may comprise a LED light source 10. Further, in embodiments, the light generating device 100 may be configured to provide device light 101 (along an optical axis O). The light generating device 100 may especially be configured to provide device light 101 to the reflector 200. The reflector 200 may be reflective for the device light 101. Further, in embodiments, the reflector 200 may comprise a first reflector module 210, and a second reflector module 220, as depicted here.

[0070] In embodiments, each of the reflector modules 210,220 may comprise an internal light exit window 201 and an external light exit window 202. Especially, as depicted, in embodiments, the first reflector module 210 may comprise a first internal light exit window 211 and a first external light exit window 212, and the second reflector module 220 may comprise a second internal light exit window 221 and a second external light exit window 222. Moreover, in embodiments, the first reflector module 210 may comprise a first end part 215 and a first reflector wall 216. Similarly, in embodiments, the second reflector module 220 may further comprise a second end part 225 and a second reflector wall 226. In embodiments, the reflector 200 may be hollow. Hence, in such embodiments, the first reflector module 210 and the second reflector module 220 may be hollow. Alternatively, in embodiments, the first reflector module 210 and the second reflector module 220, and thus the reflector 200, may comprise solid light transparent bodies. A cross-sectional view (perpendicular to the main axis A, see also further below) of the lighting arrangement 1000, wherein the reflector modules 210,220 comprise solid light transparent bodies, is depicted in Fig. 1 A subfigure II.

[0071] Moreover, in embodiments, the connector 400 may be configured to physically connect the first reflector module 210 and the second reflector module 220 (to each other). Especially, in embodiments, the connector 400 may be configured to physically connect the first end part 215 (of the first reflector module 210) and the second end part 225 (of the second reflector module 220). Hence, in embodiments, the connector 400 may be configured to support the reflector 200, especially the first reflector module 210 and the second reflector module 220. Furthermore, in embodiments, the connector 400 may comprise a hinge 410. In embodiments, the hinge 410 may hingeably connect the first reflector module 210 and the second reflector module 220 (to allow different (spatial) reflector configurations).

[0072] In further embodiments, the first reflector module 210 and the second reflector module 220 may be configurable in different (spatial) reflector configurations (relative to each other). Furthermore, the first reflector wall 216 may comprise two first wall ends 217. In embodiments, a first plane Pl may be defined through the first end part 215 and the two first wall ends 217. Similarly, in embodiments, the second reflector wall 226 may comprise two second wall ends 227. In embodiments, a second plane P2 may be defined through the second end part 225 and the two second wall ends 227. Especially, in embodiments, the first plane Pl and the second plane P2 may have a mutual angle 0.

[0073] Fig. 1 A schematically depicts the reflector 200 in a first (especially a “closed”) reflector configuration. Especially, in the first reflector configuration (of the reflector modules 210,220) the first plane Pl and the second plane P2 may have a first mutual angle pi. In embodiments, the first mutual angle pi may be essentially zero. Hence, in embodiments, in the first reflector configuration the first plane Pl and the second plane P2 may be configured parallel. However, this may not necessarily be the case.

[0074] In embodiments, a sideview cross-sectional plane P of the lighting arrangement (such as depicted in Fig. 1 A subfigure I, and Figs. 1B-3C) may be defined perpendicular to the first plane Pl and the second plane P2. In embodiment, the lighting arrangement may have a main axis A defined parallel to the sideview cross-sectional plane P and intersecting with the connector 400. In embodiments, the first plane Pl may have a first angle al relative to the main axis A. Similarly, in embodiments, the second plane P2 may have a second angle a2 relative to the main axis A. As depicted here, in the first reflector configuration, the first angle al and the second angle a2 may be equal, and may both be essentially zero. In such embodiments, the main axis A and the optical axis O may essentially coincide.

[0075] Fig. IB schematically depicts the reflector 200 in a second reflector (especially an “open”) configuration. Especially, in the second reflector configuration (of the reflector modules 210,220) the first plane Pl and the second plane P2 may have a second mutual angle 02, unequal to the first mutual angle 1. Especially, in the second reflector configuration the first plane Pl and the second plane P2 may not be configured parallel. Furthermore, in such embodiments, at least part of the arrangement light 1001 may be transmitted through a first internal light exit window 211 (of the first reflector module 210) and a second internal light exit window 221 (of the second reflector module 220). Moreover, in embodiments, a difference between a largest mutual angle pmax and a smallest mutual angle Pmin may be selected from the range of 10-180°.

[0076] As depicted here, in embodiments, the first angle al and the second angle a2 may be equal to each other and unequal to zero. In such embodiments, the main axis A and the optical axis O may essentially coincide. Alternatively, as depicted in Fig. 1C, the first angle al and the second angle a2 may be unequal. In such embodiments, the main axis A and the optical axis O may not coincide.

[0077] The lighting arrangement 1000 may be configured to generate arrangement light 1001. In embodiments, the arrangement light 1001 may comprise at least part of the device light 101. Further, in embodiments, the device light 101 may be transmitted through one or more of the first external light exit window 212 and the second external light exit window 222. Reference 500 may further refer to an optical element. Especially, in embodiments, one or more of the first internal light exit window 211 and the second internal light exit window 221 may comprise an optical element 500. In embodiments, the optical element 500 may comprise one or more of a refractive structure and a reflective structure. Especially, the optical element 500 may be configured to redirect (along the optical axis O) and / or beam shape the device light 101 (escaping from the reflector 200). Hence, in embodiment, the optical element 500 (and thus one or more of the first internal light exit window 211 and the second internal light exit window 221) may be light transmissive.

[0078] Further, in embodiments, the lighting unit 1500 may comprise a locking element configured to (temporarily) lock at least one of the (spatial) reflector configurations of the reflector modules 210,220 (relative to each other and / or to the connector 400). For example, in embodiments, the locking element may comprise one or more of a screw of a click pin.

[0079] Furthermore, in embodiments, in the sideview cross-sectional plane P of the lighting arrangement 1000 (defined perpendicular to the first plane Pl and the second plane P2) a first shortest distance dl may be defined between one of the first wall ends 217 and one of the second wall ends 227. In the first reflector configuration, in embodiments, the first shortest distance dl may be essentially zero, such as depicted in Fig. 1 A. However, in the second reflector configuration, in embodiments, the first shortest distance may be selected from the range of 5-20 cm. Figs. 2 schematically depicts some more embodiments of the lighting arrangement 1000. As indicated here, the reflector 200 may have a height h defined parallel to the main axis A. Furthermore, the reflector 200 may have a maximum width herein referred to by d2. Fig. 2A especially depicts the reflector 200 in the first reflector configuration. Fig. 2B especially depicts the reflector 200 in the second reflector configuration. As depicted in both cases, in embodiments, d2>dl.

[0080] Further, in embodiments, as depicted here, in at least one of the (spatial) reflector configurations one of the first reflector module 210 and the second reflector module 220 may be configured to host at least part of the other one of the first reflector module 210 and the second reflector module 220. In other words, in such embodiments, at least one of the first reflector wall 216 and the second reflector wall 226 may overlap the other one of the first reflector wall 216 and the second reflector wall 226. As the reflector 200 is switched from the first reflector configuration (as depicted in Fig. 2A) to the second reflector configuration (as depicted in Fig. 2B), overlapping parts of the reflector walls 216,226 may shift with respect to each other.

[0081] In the figures 4, each subfigure I schematically depicts a three-dimensional view of the lighting arrangement 1000, whereas each subfigure II schematically depicts a cross-sectional view of the lighting arrangement 1000 perpendicular to the main axis A. Especially, figs. 4A, 4B, and 4D schematically depict embodiments of overlap of the first reflector wall 216 and the second reflector wall 226. Herein the figures 4A and 4B depict embodiments where the reflector comprises (only) the first reflector module 210 and the second reflector module 220, whereas figure 4D depicts a reflector 200 comprising a third reflector module 230 and a fourth reflector module 230. Conversely, Fig. 4C schematically depicts embodiments where the reflector 200 comprises the first reflector module 210, the second reflector module 220, and a third reflector module 230, wherein each of the reflector modules 200,210,220,230 comprises a substantially solid light transparent body. The invention may thus, in embodiments, provide a light generating system 1000 (such as e.g. a track lighting system 2000) comprising a luminaire 2 having n mating reflector modules wherein a light exit window opening angle can be varied in a single direction. In such embodiments, n may be selected from the range of 2-8, such as from the range of 2-6, like from the range of 2-4. As depicted in Fig. 4A, the reflector modules 210,220 may be configured such that (i) a first virtual vector Vi (see subfigure II) extending from the plane perpendicular to (both) the first plane Pl and the second plane P2 may first intersect the first reflector wall 216 and then the second reflector wall 226, and (ii) a second virtual vector Vii (see subfigure II) extending from the plane perpendicular to (both) the first plane Pl and the second plane P2 (in a direction perpendicular to the first virtual vector Vi) may first intersect the second reflector wall 226 and then the first reflector wall 216. Hence, in such embodiments, the first reflector module 210 and the second reflector module 220 may both host at least part of the respective other reflector module 210,220.

[0082] As depicted, in Fig. 4B, the reflector modules 210,220 may be configured such that one or more virtual vectors V (see subfigure II) extending from the plane perpendicular to (both) the first plane Pl and the second plane P2 may first intersect the first reflector wall 216 and then the second reflector wall 226, or vice versa (not depicted here). Hence, in such embodiments, the second reflector module 220 may host at least part of the first reflector module 210.

[0083] As depicted, in Fig. 4B, the reflector modules 210,220 may be configured such that one or more virtual vectors V (see subfigure II) extending from the plane perpendicular to (both) the first plane Pl and the second plane P2 may first intersect the first reflector wall 216 and then the second reflector wall 226, or vice versa (not depicted here). Hence, in such embodiments, the second reflector module 220 may host at least part of the first reflector module 210.

[0084] In Fig. 4C, the reflector 200 may thus comprise a third reflector module 230. In embodiments, the third reflector module 230 may comprise a third internal light exit window and a third external light exit window 232. Moreover, in embodiments, the third reflector module 230 may comprise a third reflector wall 236. Furthermore, the third reflector wall 236 may also comprise two third wall ends 237.

[0085] Yet further, as depicted in Fig. 4D, the reflector 200 may even comprise a fourth reflector module 240. In embodiments, the fourth reflector module 240 may comprise a fourth internal light exit window and a fourth external light exit window. Moreover, in embodiments, the fourth reflector module 240 may comprise a fourth reflector wall 246. Furthermore, the fourth reflector wall 246 may also comprise two fourth wall ends 247.

[0086] Similarly to the above described, in Fig. 4D, the reflector modules 210,220,230,240 may be configured such that (i) a first virtual vector Vi (see subfigure II) extending from the main axis A may first intersect the one of the first, second, third, or fourth reflector wall 216,226,236,246 and then another one of the first, second, third, or fourth reflector wall 216,226,236,246, and (ii) a second virtual vector Vii (see subfigure II) extending from the main axis A (in a direction (perpendicular or) orthogonal to the first virtual vector Vi) may first one of the first, second, third, or fourth reflector wall 216,226,236,246 and then another one of the first, second, third, or fourth reflector wall 216,226,236,246. Hence, in such embodiments, each reflector module may host at least part of another reflector module. However, in alternative embodiments (similar to Fig. 4B), the reflector 200 may comprise the four reflector modules configured such, that two of the reflector modules may be configured to host at least part of the other two of the reflector modules. For example, in embodiments, the first reflector module 210 and the third reflector module 230 may be configured to host at least part of the second reflector module 220 and the fourth reflector module 240, i.e., the first reflector wall 216 and the third reflector wall 236 may at least partially overlap with the second reflector wall 226 and the fourth reflector wall 246.

[0087] Figs. 3 schematically depict some more embodiments of the lighting arrangement 1000. These figures especially highlight the position of the light generating device(s) 100, more especially the LED light source(s) 10, in the lighting arrangement 1000. In embodiments, the light generating device 100 may be configured to provide device light 101 to the reflector 200. In embodiments, the reflector walls 216,226 may define an internal reflector space, in other words, the reflector walls 216,226 may separate an internal reflector space from the external environment. Hence, in embodiments, the light generating device 100 may be configured to provide device light 101 to the reflector 200, especially to the internal reflector space of the reflector 200. Therefore, in embodiments, such as depicted in Fig. 3C, the LED light source 10 of the light generating device 100 may be configured centrally arranged on the connector 400, especially within the internal reflector space. Additionally or alternatively, in embodiments such as depicted in Figs. 3 A and 3B, the light generating device 100 may comprise more than one LED light source 10, such that for each reflector module 210,220 a respective LED light source 10 may be configured on the connector 400. As a further alternative, each reflector module 210,220 may comprise a LED light source 10 at any position in the internal reflector space.

[0088] Especially, in some embodiments, for each reflector module 210,220 a respective LED light source 10 may be configured on the connector 400 and within the internal reflector space (not depicted). However, in other embodiments such as depicted in Figs. 3 A and 3B, for each reflector module 210,220 a respective LED light source 10 may be configured on the connector 400 and outside of the internal reflector space. Hence, in such embodiments, the LED light source 10 may be configured to “inject” light into the reflector 200. Hence, in some embodiments, the reflector 200 may be configured downstream of the light generating device 100. Yet additionally or alternatively, in embodiments as depicted in Fig. 3D, the light generating device 100 may comprise more than one LED light source 10, such that for each reflector module 210,220 a respective LED light source 10 may be configured on its respective internal light exit window 201,211,221.

[0089] In embodiments, the reflector modules 210,220 may especially be curved. In particular, as depicted in Fig. 3 A, in embodiments, in a first cross-sectional plane defined perpendicular to the first plane Pl the first reflector wall 216 may have (a shape approximating) a semi-parabolic shape. Additionally or alternatively, in embodiments, in a second cross-sectional plane defined perpendicular to the second plane P2 the second reflector wall 226 may have (a shape approximating) a semi-parabolic shape. As depicted, in embodiments, the first reflector wall 216 and the second reflector wall 226 may have the same semi-parabolic shape. As such, in embodiments, each reflector module 210,220 may have a half conical shape, and thus, in such embodiments, the reflector 200 may have a (rounded) conical shape. However, this may not necessarily be the case.

[0090] Further, in specific embodiments (not depicted), the reflector 200 may comprise a (crossed / square shaped) compound parabolic concentrator (in at least one of the (spatial) reflector configurations).

[0091] Fig. 6 schematically depicts an embodiment of a luminaire 2 comprising the lighting arrangement 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 300 comprised by or functionally coupled to the lighting arrangement 1000. Fig. 6 also schematically depicts an embodiment of lamp 1 comprising the lighting arrangement 1000. Reference 3 indicates a projector device or projector system, which may be used to project images, such as at a wall, which may also comprise the lighting arrangement 1000. Hence, Fig. 6 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the lighting arrangement 1000 as described herein. In embodiments, such lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of arrangement light 1001, and may in specific embodiments thus be arrangement light 1001. Reference 1300 refers to a space, such as a room.

[0092] Fig. 5 schematically depicts a track lighting system 2000 comprising one or more lamps 1 and / or one or more luminaires 2 as described above. The track lighting system 2000 may further comprise an elongated track 40 configured to electrically and / or mechanically connect the connectors 400 (of the lighting arrangements 1000) to a power source 50. Especially, in embodiments, Fig. 5A schematically depicts a track lighting system 2000 comprising multiple lighting units 1500, where the reflectors 200 are configured in the first (or “closed”) reflector configuration. As depicted here, in embodiments, the lighting units 1500 may be configured hanging such that the main axis A is perpendicular to the ceiling 1310.

[0093] Alternatively, Fig. 5B schematically depicts a track lighting system 2000 comprising multiple lighting units 1500, where one reflector 200 is configured in the first (or “closed”) reflector configuration and another reflector 200 is configured in the second (or “open”) reflector configuration. As depicted here, in embodiments, the lighting units 1500 may be configured hanging such that the main axis A is parallel to the ceiling 1310. Note that, in embodiments, the lighting units 1500 may also be configured such that the main axis A may have an angle (i.e., not parallel or perpendicular) to the ceiling 1310. Hence, in embodiments as depicted here, one of the reflector modules 210,220 may be fixed (e.g. using the locking element as described above) in position with respect to the connector 400 e.g. such that in the first (“closed”) configuration the optical axis O is parallel to the ceiling 1310, whereas the other reflector module 210,220 can be tilted (e.g. using the hinge 410) in a direction of gravity, such that in the second (“open”) configuration the optical axis O is shifted away from the ceiling 1310.

[0094] The term “plurality” refers to two or more. The terms “substantially” or “essentially” herein, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein the term “comprises” means “consists of’. The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term “comprising” may in an embodiment refer to “consisting of’ but may in another embodiment also refer to “containing at least the defined species and optionally one or more other species”. Use of the verb “to comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article “a” or “an” preceding an element does not exclude the presence of a plurality of such elements. Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0095] The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation.

[0096] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0097] The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. In yet a further aspect, the invention (thus) provides a software product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein.

[0098] The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.

[0099] The invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

CLAIMS:

1. A lighting arrangement (1000) comprising a lighting unit (1500); wherein the lighting unit (1500) comprises a light generating device (100), a reflector (200), and a connector (400), wherein: the light generating device (100) comprises a LED light source (10); wherein the light generating device (100) is configured to provide device light (101); the reflector (200) is reflective for the device light (101); wherein the reflector (200) comprises a first reflector module (210), and a second reflector module (220); wherein the first reflector module (210) comprises a first internal light exit window (211) and a first external light exit window (212), and wherein the second reflector module (220) comprises a second internal light exit window (221) and a second external light exit window (222); the first reflector module (210) further comprises a first end part (215) and a first reflector wall (216); wherein the second reflector module (220) further comprises a second end part (225) and a second reflector wall (226); wherein the connector (400) is configured to physically connect the first end part (215) and the second end part (225); wherein the first reflector wall (216) comprises two first wall ends (217); wherein the second reflector wall (226) comprises two second wall ends (227); wherein the first reflector module (210) and the second reflector module (220) are configurable in different reflector configurations; a first plane (Pl) defined through the first end part (215) and the two first wall ends (217) and a second plane (P2) defined through the second end part (225) and the two second wall ends (227) have a mutual angle (P), with, in a first reflector configuration a first mutual angle (pi) and in a second reflector configuration a second mutual angle (P2), unequal to the first mutual angle (pi); and the lighting arrangement (1000) is configured to generate arrangement light (1001) comprising at least part of the device light (101), wherein the device light (101) is transmitted through one or more of the first external light exit window (212) and the second external light exit window (222), wherein, in the second reflector configuration, the first plane (Pl) and the second plane (P2) are not configured parallel, at least part of the arrangement light (1001) istransmitted through the first internal light exit window (211) and the second internal light exit window (221), and a difference between a largest mutual angle (Pmax) and a smallest mutual angle (pmin) is selected from the range of 10-180°, and wherein each of the first internal light exit window (211) and the second internal light exit window (221) comprises an optical element (500), the optical element (500) comprising one or more of a refractive structure and a reflective structure, and the optical element (500) being configured to redirect and / or beam shape the device light (101).

2. The lighting arrangement (1000) according to claim 1, wherein in the first reflector configuration the first plane (Pl) and the second plane (P2) are configured parallel.

3. The lighting arrangement (1000) according to any one of the preceding claims, wherein the connector (400) comprises a hinge (410), wherein the hinge (410) hingeably connects the first reflector module (210) and the second reflector module (220).

4. The lighting arrangement (1000) according to any one of the preceding claims, wherein one or more of the following applies: (a) in a first cross-sectional plane defined perpendicular to the first plane (Pl) the first reflector wall (216) has a semi-parabolic shape, and (b) in a second cross-sectional plane defined perpendicular to the second plane (P2) the second reflector wall (226) has a semi-parabolic shape.

5. The lighting arrangement (1000) according to claim 4, wherein the first reflector wall (216) and the second reflector wall (226) have the same semi-parabolic shape.

6. The lighting arrangement (1000) according to any one of the preceding claims, wherein the reflector (200) comprises a compound parabolic concentrator.

7. The lighting arrangement (1000) according to any one of the preceding claims 1-6, wherein the reflector (200) is a hollow reflector.

8. The lighting arrangement (1000) according to claim 7, wherein in at least one of the reflector configurations one of the first reflector module (210) and the second reflector module (220) is configured to host at least part of the other one of the first reflector module (210) and the second reflector module (220), such that one or more virtual vectors (V)parallel to at least one of the first plane (Pl) and the second plane (P2), and extending from a plane perpendicular to the first plane (Pl) and the second plane (P2), intersects with both the first reflector wall (216) and the second reflector wall (226).

9. The lighting arrangement (1000) according to any one of the preceding claims 1-6, wherein each of the reflector modules (210,220) comprises a solid light transparent body.

10. The lighting arrangement (1000) according to any one of the preceding claims, wherein in a sideview cross-sectional plane (P) of the lighting arrangement (1000) in the second reflector configuration a first shortest distance (dl) is defined between one of the first wall ends (217) and one of the second wall ends (227), and wherein in the second reflector configuration the first shortest distance (dl) is selected from the range of 5-20 cm.

11. The lighting arrangement (1000) according to any one of the preceding claims, wherein the lighting unit (1500) comprises a locking element configured to lock at least one of the reflector configurations of the reflector modules (210,220).

12. A lighting device (1200) selected from a lamp (1) or a luminaire (2) comprising the lighting arrangement (1000) according to any one of the preceding claims 1- 11.

13. A track lighting system (2000) comprising one or more lamps (1) and / or one or more luminaires (2) according to claim 12, wherein the track lighting system (2000) comprises an elongated track (40) for electrically and mechanically connecting the connectors (400) to a power source (50).

Images