Lighting device for illuminating a surface

Abstract

A lighting device (100) for illuminating a surface (110). The lighting device comprises at least one first light source (120) configured to emit a first light beam (140) in a first direction and at least one second light source (130) configured to emit a second light beam (150) in a second direction not parallel to the first direction. The first light beam (140) has a first spectral power distribution, the second light beam (150) has a second spectral power distribution, and the second spectral power distribution is different from the first spectral power distribution. The lighting device further comprises at least one light delimiting element (160), the at least one light delimiting element (160) being adjustable relative to at least one of the at least one first light source and the at least one second light source. The at least one light-defining element is further configured to delimit the first light beam and the second light beam, thereby modifying an overlapping area on a surface (110) of the first light beam (140) and the second light beam (150) by forming a light boundary (170) separating the first light beam and the second light beam, so that the first light source is configured to illuminate at least a first area (180) of the surface, and the second light source is configured to illuminate at least a second area (190) of the surface adjacent to the at least one first area of ​​the surface.

Description

Technical Field

[0001] The present invention generally relates to lighting devices including beam definers. More particularly, the present invention relates to adjustment of the beam definer to obtain a desired lighting effect. Background Art

[0002] The use of fixed structures or barn doors to define the beam of a spotlight, lamp or luminaire represents a technique widely used in applications such as theatres, concerts, large venues, etc. These fixed structures offer a number of advantages such as being completely light absorbing, thus allowing sharp edges to be created around the beam defined by the structure.

[0003] Additionally, luminaires with individually controllable light sources used in combination with fixed structures continue to attract great interest. Individually controllable light sources enable color gradients of light beams to be produced, and it is appreciated and desirable to have a lighting device that enables a light beam to illuminate a surface or surfaces with different colors.

[0004] However, because these lighting devices may include several light sources, it is difficult to obtain sharp and distinct light separation between different light effects or gradients of different colors of the light beam. Although the edges of the light beam may be more defined by fixed structures, when such fixed structures are employed, there is currently a lack of clear demarcation of light effects.

[0005] It is therefore an object of the present invention to attempt to overcome at least some of the deficiencies of existing fixing structures in terms of their ability to achieve a clear light separation between different light effects. Summary of the invention

[0006] Therefore, there is an interest in overcoming at least some of the above-mentioned drawbacks in order to improve the separation of light generated by individually controllable light sources.

[0007] This and other objects are achieved by providing a lighting device having the features according to the present disclosure.Preferred embodiments are defined in the present disclosure.

[0008] Therefore, according to the present invention, a lighting device for illuminating a surface is provided. The lighting device includes at least one first light source configured to emit a first light beam in a first direction and at least one second light source configured to emit a second light beam in a second direction that is not parallel to the first direction. The first light beam has a first spectral power distribution, the second light beam has a second spectral power distribution, and the second spectral power distribution is different from the first spectral power distribution. The lighting device also includes at least one light defining element, which is adjustable relative to at least one of the at least first light source and the at least second light source. The at least one light defining element is also configured to define the first light beam and the second light beam, thereby modifying the overlapping area on the surface of the first light beam and the second light beam by forming a light boundary that separates the first light beam and the second light beam, so that the first light source is configured to illuminate at least a first area of ​​the surface, and the second light source is configured to illuminate at least a second area adjacent to the at least one first area of ​​the surface.

[0009] Therefore, the present invention is based on the idea of ​​providing a lighting device, which includes at least one light delimiting element, which enables the adjustment of the position and the sharpness of the light boundary generated between the first and second light beams emitted from (multiple) first light sources and (multiple) second light sources, for illuminating adjacent areas of a surface. The term "adjacent" here means that the two areas are adjacent to each other, so that they touch at some points or lines, thereby generating an overlapping area of ​​the light effect. The term "light delimiting element" here refers to one or more elements, structures, units, etc., which are configured to delimit and / or at least partially block the first and / or second light beams emitted by at least one first light source or at least one second light source. The term "light boundary" here refers to the boundary or edge between the first and second light beams, which separates the first and second light beams from each other. The term "surface" here refers to a single surface (such as a wall, ceiling, etc.), or multiple surfaces (such as (two) separated walls, a wall and a ceiling, etc.). The term "area of ​​a surface" here refers to a part of a surface (such as a wall or ceiling), which may include one or more corners, or have at least an uneven or uneven appearance (such as a 90° angle formed between adjacent walls). Where the surface has a uniform or flat appearance (eg, a single wall), the term "area of ​​the surface" refers to a portion of the uniform surface.

[0010] An advantage of the lighting device of the invention is that it can be used for professional applications (e.g. in spectacle venues such as theatres, films, festivals, concerts etc.) as well as for domestic or personal lighting purposes. In addition, the illuminated first area(s) and second area(s) of the surface mentioned above may be represented by walls, ceilings, floors, or any other surface(s) where a lighting effect may be desired.

[0011] It will be appreciated that for reasons of energy efficiency, at least one first light source and at least one second light source configured to emit the first and second light beams may be represented by (but not limited to) LEDs (light emitting diodes). Since the first and second light beams may also emit light beams having different spectral power distributions, the light beams may differ in color and / or intensity. A further advantage of the present invention is that the first and second light sources may comprise a plurality of lighting nodes (e.g., a plurality of LEDs), which in turn may be individually controllable. Such individual control of the plurality of lighting nodes forming the light source allows the lighting device to generate a wider range of lighting effects, thereby rendering the present solution applicable to an even wider range of applications. The first and second light sources according to the present invention may also provide a variable orientation of the light beams emitted thereof. In other words, the first and second light sources may emit light beams in different directions (e.g., non-parallel). Therefore, the light emission direction between the first and second light sources may produce an angle between 0 and 180 degrees. This variability of the light beam orientation further results in an increase in the lighting effect capabilities provided by the present invention.

[0012] Another advantage of the present invention is that at least one light defining element can be connected or attached to the lighting device via a pivot. Such a pivot can allow the light defining element to rotate around the pivot point, thereby providing the adjustability of its direction, i.e. the adjustability of the angle formed by the light defining element relative to the first and second light sources. The light defining element can further have a fixed / rigid connection to the lighting device and can provide an adjustable size, thereby further leading to an increase in the ability to obtain various light effects. Such light effects can be generated by the definition or blocking of part of the first light beam and / or the second light beam. Therefore, the definition or at least partial blocking provided by the light defining element can substantially eliminate any overlap of the first light beam and the second light beam, thereby resulting in the generation of sharp and obvious edges of the first light beam and the second light beam. Furthermore, this sharp and obvious edge also leads to obtaining a clear (definite) light boundary that separates the first light beam emitted by the (multiple) first light source and the second light beam emitted by the (multiple) second light source.

[0013] A further advantage of the inventive concept is that the portion of the first and second light beams that is bounded or at least partially blocked by the bounding element can represent a peripheral portion of the light beams. The term "peripheral portion" here refers to an outer portion of the light beam consisting of a weaker light intensity than the central portion of the light beam. This delimitation of the edges of the first and second light beams by the (multiple) light delimiting elements allows the first area and the second area to be illuminated with uniform and high-intensity light. Delimiting the peripheral portion of the first and second light beams also results in obtaining a clear and distinct light boundary between the light beams, as well as an increased variability of the light effect.

[0014] It will be appreciated that, furthermore, the lighting device of the present invention comprises relatively few components. An advantage of a relatively low number of components is that the lighting device is relatively cheap to manufacture. Furthermore, a relatively low number of components of the lighting device means that it is easier to recycle, especially compared to devices or arrangements comprising a relatively high number of components (which prevent easy disassembly and / or recycling operations).

[0015] Thus, as proposed by the inventive concept, the use of adjustable light defining elements in a lighting device allows for obtaining specific and customizable light effects on different areas of a surface to be illuminated and further enables a user to manipulate the light defining elements in such a way that the light boundaries can be placed at desired locations on said surface.

[0016] At least one of the at least one first light source and the at least one second light source may comprise a color-controllable light source, and the lighting device may be configured to control the color of the light emitted from the color-controllable light source. This example has the advantage that the color-controllable light source results in a greater variety of light effects, such as illuminating a first area with a first color, and illuminating a second area with a second color. This example may permit illuminating a wall (e.g., a first area of ​​a surface) with sunlight-like colored light, while illuminating a ceiling (e.g., a second area of ​​a surface) with sky-like colored light. This example also has the advantage that the color-controllable light source allows light of different intensities to be emitted by different light sources. This difference in light intensities emitted by the first light source(s) and the second light source(s) results in the possibility of an even wider range of light effects, such as illuminating the first and second areas with different light intensities.

[0017] At least one of the at least one first light source and the at least one second light source may comprise a plurality of light sources arranged in a linear array. The term "linear array" herein refers to a linear arrangement or chain of a plurality of light sources (e.g., LEDs, or other light sources that may be used in the present invention). Depending on the size of at least the first area and / or at least the second area of ​​the surface to be illuminated, such a linear array may further be positioned horizontally or vertically on the lighting device, thereby permitting greater adaptability to particular applications and allowing greater light effects related to light intensity to be achieved. This example also has the advantage that it allows greater illumination coverage of at least the first area and at least the second area of ​​the surface.

[0018] At least one light delimiting element may have an elongated shape. The elongated shape of the light delimiting element may represent a linear shape and may provide a sufficient length that allows the light delimiting element to delimit and / or at least partially block the first light beam and / or the second light beam. This example also has the advantage that the elongated linear shape of the at least one light delimiting element represents an uncomplicated component that can be easily interchanged or replaced, resulting in greater usability of the lighting device.

[0019] At least one light-defining element may have an adjustable length. This example has the advantage that it allows the delimitation and / or at least partial blocking of at least one of the first and second light beams to be adjusted. In other words, a greater or lesser delimitation of one or more of the first and second light beams is permitted by increasing or decreasing the length of the light-defining element(s), resulting in a wider or thinner light boundary between the first and second light beams. The advantage of the adjustment of the light boundary is that it allows the lighting device to be suitable for applications in which it is preferred that a clear separation between different light effects involves an un-irradiated area between the illuminated first area and the illuminated second area (e.g., when the surface includes a portion where illumination between the first and second areas is not required). This example also has the advantage that it allows the lighting device to be more adaptable to the environment in which it may be operated. The adjustable length of the light-defining element(s) may be fully retracted within the lighting device, thereby allowing the lighting device to be positioned very close to the surface to be illuminated. This example also has the advantage that it allows the light-defining element to be less dangerous in the environment in which the lighting device is operating. Furthermore, this example increases the adaptability of the lighting device to different types of light sources and allows one or more light defining elements to affect at least one of the first and second light beams in a variety of ways (i.e., increasing or decreasing the definition of the light beams), resulting in increased variability in the light effects.

[0020] The light defining element can have an adjustable width. This example has the following advantages: it allows the lighting device to be applied to a light source including a linear array of multiple light sources, for example, as described in the previous embodiment. If the light source actually includes a linear array of multiple light sources, the adjustable width allows the light defining element to effectively define and / or at least partially block the light emitted by the first light source and the second light source for any orientation of the light source. In addition, the adjustable width of the light defining element also allows the sharpness or distinctiveness of the light boundary that separates the first area of ​​the illuminated surface from the second area of ​​the illuminated surface to be adjusted. For example, a wider light defining element will generate a sharper and more obvious light boundary, and a thinner light defining element will generate a less sharp light boundary. This adjustable width also provides advantages similar to those described with respect to the previous embodiment, as well as the possibility of allowing a combination effect between this embodiment and the previous embodiment. This combination effect allows (multiple) light defining elements to achieve greater definition of at least one of the first light beam and the second light beam, thereby resulting in an increase in the lighting effect capabilities provided by the present invention.

[0021] At least one light-defining element may include at least one light-transmissive portion. The term "light-transmissive" herein refers to translucent and / or transparent. The light-transmissive portion may include a material that allows one or both of the first light beam and the second light beam to at least partially pass through the (multiple) light-defining element, thereby resulting in different lighting effects (e.g., where the light boundary may include a lighting effect of light emitted from at least one of the first light beam and the second light beam and transmitted through the light-defining element).

[0022] The light-transmitting portion of the light-defining element may have a light transmittance (such as transparency) that is adjustable along the length of the light-transmitting portion. The adjustable light transmittance of the portion of the (multiple) light-defining element permits the generation of various light effects for which the intensity of the light transmitted through the portion of the light-defining element is different. This example also has the advantage that the adjustable light transmittance of the portion allows the light-defining element of the lighting device to be universal. More specifically, it can be conveniently designed to provide a desired lighting distribution for illumination and / or decorative purposes, thereby permitting the lighting device to be suitable for an even wider range of applications. For example, the portion of the light-defining element may have a light transmittance that has a gradient that varies from opaque near the first light source and / or the second light source; while providing a greater light transmittance closest to the illuminated surface. In this way, the light-defining element allows the sharpness of the light boundary between two distinct light effects (i.e., the illumination of the surface generated by the first light beam and the second light beam) to be gradually reduced.

[0023] At least one light defining element can be configured to reflect at least a portion of at least one of the first and second light beams. The reflective properties of the material forming the (multiple) light defining elements can allow light to be reflected by total internal reflection. The term "total internal reflection" known to the technician describes the phenomenon that occurs when a propagating light wave shines on a medium boundary at an angle greater than a certain critical angle relative to the surface normal. If the refractive index is lower on the other side of the boundary and the angle of incidence is greater than the critical angle, the light wave cannot pass and is completely reflected. This reflection of a portion of one or both of the first and second light beams further allows the first and second light beams to illuminate the first and / or second areas of the surface. This example further allows a greater light distribution of the first and second light beams. In addition, this example has the following advantages: when less light passes through the light defining element without being reflected thereon, it allows a sharper and more defined light boundary to be obtained.

[0024] At least one light defining element may include at least one light source. The (multiple) light sources may also include a linear light source array as described in the previous embodiments, and may be positioned on the light source in such a way that the light beam generated by the light source is directed within the light boundary that separates the first light beam and the second light beam. This example has the following advantages: it permits the light boundary to be adjusted by turning the light source on or off during operation of the lighting device. Turning the light source off allows a sharp boundary of light, while turning the light source on allows the light boundary to include a color gradient that is a transition between the color of the first light beam and the color of the second light beam. In addition, the transition color gradient may be based on a color value or setting of at least one of the first light source and the second light source. The transition color gradient may also be based on an interpolation or average value of the color values ​​of the first and second light beams, and may therefore be controlled by a user (e.g., digitally) to provide a light setting. Therefore, this example results in an increased variability of the light effect.

[0025] At least one first light source can be arranged on a first surface of the lighting device, and at least one second light source can be arranged on a second surface of the lighting device, respectively, wherein at least one light defining element is adjustably arranged at a first angle relative to the first surface and adjustably arranged at a second angle relative to the second surface. The adjustable angular positioning relative to the first and second surfaces of the lighting device permits the light defining element to provide a greater defining effect for the light beam or the second light beam, and thus to provide a greater effect on the definition of the light boundary. In other words, the defining efficiency (generated by one or more light defining elements) of at least one of the first and second light beams depends on at least one of the first angle and the second angle. For example, a smaller value of the first angle formed between the light defining element and the first surface can result in a more significant light definition and / or at least partial light blocking effect relative to a larger value of the same first angle. In addition, one or more light defining elements adjustably arranged at such a first angle and a second angle permit the adjustability of the positioning, size and sharpness of the light boundary on the illuminated surface. Therefore, this example again facilitates the adjustability of the light effect obtained from the lighting device and the definition of its light boundary.

[0026] At least one of the first surface and the second surface can be adjustably arranged at a third angle relative to the second surface and the first surface, respectively. This example has the following advantages: it also allows the adjustability of the positioning, size and sharpness of the light boundary on the illuminated surface, as well as the adjustability of the light boundary effect provided by the (multiple) light boundary elements. In addition, this example has the following advantages: it allows the use of fixed (i.e. non-rotating / non-adjustable) light boundary elements, while still providing a lighting device capable of adjusting the boundary effect generated by the light boundary element and the positioning, size and sharpness of the light boundary on the illuminated surface. In addition, this example also allows parallel alignment of the first surface and the second surface, thereby increasing the efficiency of the light distribution for illumination and lighting effects on a surface with a flat or uniform appearance (e.g., a single wall).

[0027] The lighting device may include at least one third light source arranged on a third surface, wherein the third surface is opposite to one of the first surface and the second surface. The third light source(s) may also include a linear light source array as described in the previous embodiment. This example has the following advantages: it allows a greater light output to be emitted from the lighting device, resulting in increased light intensity and more efficient light distribution over the first area and the second area.

[0028] According to another aspect of the present invention, there is provided a lighting arrangement comprising a lighting device as described above, wherein the lighting arrangement further comprises a surface having at least a first area and at least a second area adjoining at a corner.The light boundary may be directed to at least one corner.

[0029] This lighting arrangement has the advantage that it allows even greater light effects. For example, the first area of ​​the surface may be a wall and the second area of ​​the surface may be a ceiling. Thus, the first light beam may illuminate the second area with a different color than the color of the second light beam illuminating the second area.

[0030] The distance between the at least one first light source and the surface may be different than the distance between the at least one second light source and the surface. This has the advantage that it allows the lighting device to be adapted to a wider range of applications, wherein the positioning of the lighting device in the environment and the type of surface and proximity to said surface may be different.

[0031] Further objectives, features and advantages of the present invention will become apparent when studying the following detailed disclosure, the drawings and the appended claims.Those skilled in the art will realize that different features of the present invention can be combined to create embodiments other than those described in the following. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] This and other aspects of the present invention will now be described in more detail, with reference to the accompanying drawings showing embodiment(s) of the invention.

[0033] Figure 1a Schematically shows a lighting device according to an exemplary embodiment of the present invention,

[0034] Figure 1b Schematically shows a lighting device according to another exemplary embodiment of the present invention,

[0035] Figure 2 Schematically shows a lighting device according to another exemplary embodiment of the present invention,

[0036] Figure 3 Schematically shows a lighting device according to another exemplary embodiment of the present invention,

[0037] Figure 4a Schematically shows a lighting device according to another exemplary embodiment of the present invention,

[0038] Figure 4b An alternative lighting arrangement is schematically shown,

[0039] Figure 5a An alternative lighting arrangement is schematically shown,

[0040] Figure 5b schematically shows a lighting device according to another exemplary embodiment of the present invention, and

[0041] Figure 6 A lighting device according to another exemplary embodiment of the present invention is schematically shown. DETAILED DESCRIPTION

[0042] Figure 1a The lighting device 100 is shown to include a first surface 121 and a second surface 131 on which a first light source 120 and a second light source 130 are arranged, respectively. Both the first and second light sources 120, 130 are color controllable light sources and include a linear array of multiple light sources (not visible). Figure 1a Also depicted is a first light beam 140 emitted from the first light source 120 and a second light beam 150 emitted from the second light source 130. The first light beam 140 is illuminating a first area 180 of the surface 110, and the second light beam 150 is shown illuminating a second area 190 of the surface 110. Both the first and second light beams 140, 150 may emit light of a particular color at a particular intensity. Figure 1a , the surface 110 includes a corner formed between a first region 180 and a second region 190, thus representing, for example, two vertical walls (e.g., of a room). Figure 1a represents a top view of the lighting device 100. In addition, Figure 1aA first light defining element 160 and a second light defining element 161 are shown, both of which are attached to the lighting device 100 via a pivot 162. The pivot 162 positions the first and second light defining elements 160, 161 between the first light source 120 and the second light source 130. The first and second light defining elements 160, 161 are adjustable about the pivot 162 (i.e., they can rotate about the pivot 162) to form a first angle 102 relative to the first surface 121 and a second angle 103 relative to the second surface 131, respectively. It should be noted that Figure 1a 1 shows the first and second surfaces 121, 131 on which the first and second light sources 120, 130 are arranged, and the first and second surfaces 121, 131 form a third angle 101 of 90°. The third angle 101, which may be less than 90° (such as, for example, 60°), preferably varies between 90° and 180°. The third angle 101 may preferably be similar to, but not limited to, the angle formed between the first area 180 and the second area 190 to be illuminated by the lighting device 100. Figure 1a It is also shown that the first light defining element 160 defines and / or partially blocks the first light beam 140, so that the edge of the first light beam 140 (on the light delimiter 160 side) contacts the first area 180 at its corner end. The first light delimiting element 160 can fully or partially reflect the portion of the first light beam 140 that contacts the first light delimiting element 160. Similarly, the second light delimiting element 161 defines and / or partially blocks the second light beam 150, so that the edge of the second light beam 150 (on the light delimiter 160 side) contacts the second area 190 at its corner end. In the absence of the light delimiting elements 160 and 161, the adjacent first and second areas 180 and 190 will respectively produce overlapping areas. The combination of the defining effects of the first and second light delimiting elements 160, 161 on the first and second light beams 140, 150, respectively, generates the formation of a light boundary 170 that separates the first and second light beams 140, 150. The adjustable arrangement of the first and second light delimiting elements 160, 161 enables a sharp and distinct light boundary 170 to be obtained, for which the two edges (formed by each delimiting edge of the first and second light beams 140, 150) converge into a well-defined line precisely located in the corner formed by the perpendicular first and second areas 180, 190. The effect of the light delimiting elements 160, 161 is that there is no overlap between the first and second light beams 140, 150, thus allowing separate and possibly different light effects on the first and second areas 180, 190. It should be noted that the transparency and width (both not shown) of the first and / or second light delimiting elements 160, 161 of the lighting device 100 can also be adjusted with the aim of obtaining a greater variety of light effects and a light boundary 170 of greater sharpness.

[0043] Figure 1bDifferent applications of the lighting device 100 are schematically shown, wherein the first and second light delimiting elements 160 , 161 are fixedly attached between the first and second light sources 120 , 130 . Figure 1b The different lighting applications shown in FIG. 1 show a first area 181 representing a ceiling, a second area 191 representing a wall, and a surface 111 to be illuminated including a corner formed by such first and second areas 181, 191. Thus, Figure 1b shows a horizontal orientation (as compared to Figure 1a In order to achieve a distinct light effect on the first and second regions 181, 191, the length, width and transparency of the first and second light-defining elements 160, 161 can be adjusted so that the light boundary 170 is precisely located in the corner formed by the first and second regions 181, 191.

[0044] Figure 2 A lighting device 200 is schematically shown, comprising a first surface 201 and a second surface 202, on which a first light source 210 and a second light source 220 are arranged, respectively. The first and second light sources 210, 220 may be color-controllable light sources, and may include a linear array (not visible) of a plurality of light sources. The lighting device 200 also includes a single light-defining element 230 having an elongated shape and attached to the lighting device 200 via a pivot 240. The pivot 240 positions the light-defining element 230 between the first light source 210 and the second light source 220, and allows it to be adjustable around its axis (i.e., the light-defining element 230 may be rotated around the pivot 240). In addition, Figure 2 The light defining element 230 shown in the figure has an adjustable length. This length can be increased or decreased by extending or retracting the light defining element 230 in the direction indicated by the arrow. The light defining element 230 can be extended to its full length to maximize the defining effect of the light defining element 230. The light defining element 230 can also be fully retracted within the lighting device 200. Adjustment of the length of the light defining element 230 and / or its rotation about the pivot 240 permits definition of a clear light boundary (not shown) and allows different light effects to be obtained on different areas of the illuminated surface (not shown).

[0045] Figure 3 The lighting device 300 is shown to include a first surface 301 and a second surface 302 on which a first light source 310 and a second light source 320 are arranged respectively. The first and second light sources 310, 320 may be color controllable light sources and may include a linear array of multiple light sources (not visible). Figure 3Also shown are a first light defining element 350 and a second light defining element 360, both of which are attached to the lighting device 300 via a pivot 340. The pivot 340 positions the first and second light defining elements 350, 360 between the first light source 310 and the second light source 320. The first and second light defining elements 350, 360 are adjustable about the pivot 340 (i.e., they can rotate about the pivot 340) to form a first angle 303 relative to the first surface 301 and a second angle 304 relative to the second surface 302, respectively. In addition, the first and second light defining elements 350, 360 include an additional light source 330, which is attached to both the first and second light defining elements 350, 360 and is located between the two. The additional light source 330 may include a linear array of multiple color controllable light sources and may be positioned so that its light beam (not shown) is oriented within the light boundary formed between the defining beam of the first light source 310 and the defining beam of the second light source 320. In other words, the light beam of the additional light source 330 is configured to illuminate a light boundary and overlap a portion of the bounded side of the light beams of both the first and second light sources 310, 320. It should be noted that the lighting device 300 can be operated with the additional light source 330 turned on or off. Thus, such activation and deactivation of the additional light source 330 enables the user to alternate between: a sharp and distinct light boundary when the additional light source 330 is turned off; and a color gradient transition (not shown) between the bounded light beam of the first light source 310 and the bounded light beam of the second light source 320 when the additional light source 330 is turned on.

[0046] Figure 4a and Figure 4b A lighting device comprising more than two light sources separated by an intermediate light delimiting element is schematically shown. Figure 4a A lighting device 400 is shown that includes a first surface 412, a second surface 422, and a third surface 432, on which a first light source 410, a second light source 420, and a third light source 430 are arranged, respectively. One or more of the light sources 410, 420, 430 may be color-controllable light sources, and may include a linear array (not visible) of a plurality of light sources. The first and second surfaces 412, 422 are separated by a first light-defining element 440 attached to the lighting device 400 via a first pivot 470. The first pivot 470 positions the first light-defining element 440 between the first light source 410 and the second light source 420. In addition, the first light-defining element 440 is adjustable around the first pivot 470 to define the light beams emitted by the first and second light sources 410, 420. Similar to the above description, a second light-defining element 450 attached to and adjustable around the second pivot 460 generates a defining effect on the light beams emitted by the second and third light sources 420, 430. Therefore, if Figure 4aThe lighting device 400 depicted in Figure 3 , i.e., enabling the user to alternate between: a sharp and distinct light boundary when the second light source 420 is off; and a color gradient transition (not shown) between the defined light beam of the first light source 410 and the defined light beam of the third light source 430 when the second light source 420 is on. The lighting device 400 can also be used in applications where three areas of a surface need to be illuminated with different light effects. In this case, the angle formed between the second surface 422 and the first surface 412 and the angle formed between the second surface 422 and the third surface 432 can be adjustable depending on the angle formed between the areas to be illuminated.

[0047] Figure 4b An alternative lighting device 401 is shown comprising a single surface 402 on which a plurality of light sources 411 , 421 , 431 , 441 are arranged. Figure 4b 4. The light sources presented in FIG. 4 are separated by light delimiting elements 451, 461, 471, 481, 491, respectively, which are attached to the lighting device 401 via a pivot and are positioned between each light source 411, 421, 431, 441 and at both ends of the surface 402. The adjustment of the different light delimiting elements 451, 461, 471, 481, 491 about their respective pivots and the adjustment of their respective lengths, widths and transparencies allows the light beam emitted by each light source 411, 421, 431, 441 to be delimited to different areas of the surface as many as the light sources (i.e., for Figure 4b As shown in the application, distinctive light effects are generated on four different areas.

[0048] Figure 5a and Figure 5b The scene is schematically shown where the surface 530 to be illuminated represents a flat or uniform surface (ie there are no angles or corners formed by different areas of the surface). Figure 5a Also shown is a lighting device 500 comprising a first surface 502 and a second surface 503 on which a first light source 504 and a second light source 505 are arranged respectively. Both the first and second light sources 504, 505 are color controllable light sources and both comprise a linear array of multiple light sources (not visible). Figure 5aAlso depicted is a first light beam 510 emitted from a first light source 504 and a second light beam 520 emitted from a second light source 505. The first light beam 510 is illuminating a first area 550 of a surface 530, and the second light beam 520 is shown illuminating a second area 560 of the surface 530. Additionally, both the first and second light beams 510, 520 may emit light of a particular color at a particular intensity. Figure 5a Also shown is a first light delimiting element 570 and a second light delimiting element 580, both of which are attached to the lighting device 500 via a pivot 506 located between the first and second light sources 504, 505. The adjustment of the first and second light delimiting elements 570, 580 and the light delimiting effect and light boundary 540 generated thereby by the first and second light delimiting elements 570, 580 are similar to Figure 1a Description used in . Figure 5a It is also shown that the first surface 502 and the second surface 503 are parallel. In other words, the angle formed between the first surface 502 and the second surface 503 is 180°. By arranging the first and second light sources 504, 505 on the parallel surfaces 502, 503 facing the first and second areas 550, 560 to be illuminated, the lighting device 500 can achieve effective light distribution with greater light intensity of the first and second light beams 510, 520 on the flat or uniform surface 530. Figure 5a Also depicted are two fixed light-defining elements 590 rigidly attached and positioned at opposite ends of the first and second surfaces 502 , 503 , thereby defining the outer edges of the first and second light beams 510 , 520 .

[0049] Figure 5b Shown in Figure 5a An alternative lighting device 501 operating in the same application as depicted in the application, and for a deeper understanding, reference is also made to Figure 5a However, in Figure 5b In FIG. 5 , the lighting device 501 comprises an angle 511 which is less than 180°. This illustrates the adjustability of the light effect on the first and second areas 550 , 560 of the flat or uniform surface 530 . Figure 5b Also depicted is a rigidly attached light defining element 591 and a Figure 5a A combination of adjustable light-defining elements 571, 581 described in.

[0050] Figure 6The lighting device 600 is schematically shown to include a first surface 612 and a second surface 622, on which a first light source 611 and a second light source 621 are arranged, respectively, and the first light source 611 and the second light source 621 are configured to emit corresponding light beams (not shown) on the surface 620. The lighting device 600 also includes a first light-defining element 630 and a second light-defining element 640. At least one of the first and second light-defining elements 630, 640 is adjustably attached to the lighting device 600 via a pivot and includes a first light-defining element 630 and a second light-defining element 640. Figure 1a The lighting device 600 further comprises two supporting light sources 650 arranged on opposite surfaces relative to the first and second surfaces 612, 622. Figure 6 Also shown is a light reflector 610, which is made of a reflective material and is arranged to partially cover the supporting light source 650 so as to reflect at least a portion of the light beam emitted from the supporting light source 650. Thus, the reflector 610 reflects and redirects the light emitted from the supporting light source 650 toward various areas of the surface 620 to be illuminated, thereby providing a greater light output to be emitted from the lighting device 600.

[0051] Other variations of the disclosed embodiments may be understood and effected by those skilled in the art in practicing the claimed invention by studying the drawings, the disclosure and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are cited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims

1. A lighting device (100) for illuminating a surface (110), the lighting device (100) comprising: - a first light source (120) configured to emit a first light beam (140) in a first direction, wherein the first light beam (140) has a first spectral power distribution, a second light source (130) configured to emit a second light beam (150) in a second direction non-parallel to the first direction, wherein the second light beam (150) has a second spectral power distribution, and wherein the second spectral power distribution is different from the first spectral power distribution, and - a light-delimiting element (160) adjustable relative to at least one of the first light source (120) and the second light source (130), The light-delimiting element (160) is configured to delimit the first light beam (140) and the second light beam (150), thereby modifying an overlapping area on a surface (110) of the first light beam (140) and the second light beam (150) by forming a light boundary (170) separating the first light beam (140) and the second light beam (150), so that the first light source (120) is configured to illuminate a first area (180) of the surface (110), and the second light source (130) is configured to illuminate a second area (190) of the surface (110), the second area (190) being adjacent to the first area (180).

2. The lighting device (100) according to claim 1, wherein at least one of the first light source (120) and the second light source (130) comprises a color-controllable light source, and wherein the lighting device (100) is configured to control the color of light emitted from the color-controllable light source.

3. The lighting device (100) according to claim 1, wherein at least one of the first light source (120) and the second light source (130) comprises a plurality of light sources arranged in a linear array.

4. The lighting device (100) according to claim 2, wherein at least one of the first light source (120) and the second light source (130) comprises a plurality of light sources arranged in a linear array.

5. The lighting device (100) according to any one of the preceding claims, wherein the light delimiting element (160) has an elongated shape.

6. The lighting device (100) according to any one of claims 1 to 4, wherein the light delimiting element (160) has an adjustable length.

7. The lighting device (100) according to any one of Claims 1 to 4, wherein the light-delimiting element (160) has an adjustable width.

8. The lighting device (100) according to any one of claims 1-4, wherein the light delimiting element (160) comprises a light transmitting portion.

9. The lighting device (100) according to claim 8, wherein the light-transmitting portion has a light transmittance that is adjustable along a length of the light-transmitting portion.

10. The lighting device (100) according to any one of claims 1-4, wherein the light delimiting element (160) is configured to reflect at least a portion of at least one of the first light beam (140) and the second light beam (150).

11. The lighting device (100) according to any one of claims 1 to 4, wherein the light delimiting element (160) comprises at least one light source (330).

12. The lighting device (100) according to claim 5, wherein the first light source (120) is arranged on a first surface of the lighting device (100), wherein the second light source (130) is arranged on a second surface of the lighting device (100), and wherein the light-defining element (160) is adjustably arranged at a first angle (102) relative to the first surface and adjustably arranged at a second angle (103) relative to the second surface.

13. The lighting device (100) according to claim 12, wherein at least one of the first surface and the second surface is adjustably arranged at a third angle (101) relative to the second surface and the first surface, respectively.

14. The lighting device (100) according to claim 12, further comprising at least one third light source (650) arranged on a third surface, wherein the third surface is opposite to one of the first surface and the second surface.

15. The lighting device (100) according to claim 13, further comprising at least one third light source (650) arranged on a third surface, wherein the third surface is opposite to one of the first surface and the second surface.

16. A lighting arrangement comprising the lighting device (100) according to any of the preceding claims, wherein the lighting arrangement further comprises a surface having the first area (180) and the second area (190) adjoining at a corner, and wherein the light boundary (170) is directed to the corner.

17. The lighting arrangement of claim 16, wherein a distance between the first light source (120) and the surface (110) is different from a distance between the second light source (130) and the surface (110).

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