Lighting

Abstract

A lighting device (100) comprises: a plurality of light sources (110); a cover (120) comprising a material that is at least partially light-transmissive, wherein the cover at least partially surrounds the plurality of light sources; and a plurality of reflectors (130) arranged within the cover and at corresponding peripheral portions of the cover, wherein a first group of light sources (140) is arranged within the plurality of reflectors so that the light sources within each reflector are configured to emit a corresponding light beam from the lighting device, and wherein a second group of light sources (150) is arranged outside the plurality of reflectors and is configured to emit light from the lighting device, wherein the lighting device further comprises a control unit (160) configured to individually control the operation of the first group of light sources and the second group of light sources.

Description

Technical Field

[0001] The present invention generally relates to lighting devices, for example, the lighting devices include one or more light emitting diodes (LEDs). More specifically, the lighting devices are arranged to provide decorative lighting while being able to provide dynamic shading and reduce glare during operation. Background Art

[0002] The use of light emitting diodes (LEDs) for lighting purposes continues to gain attention. Compared with incandescent lamps, fluorescent lamps, neon lamps, etc., LEDs offer numerous advantages such as longer operating life, reduced power consumption, and improved efficiency related to the ratio between light energy and heat energy.

[0003] It is of interest to have lighting devices and / or apparatuses (such as lamps) that are capable of producing decorative (white) light and causing improved and / or new dynamic shading, while being capable of reducing glare. In the prior art, there are numerous examples of lighting devices that are intended to produce decorative light. However, these lighting devices are generally not able to provide dynamic shading of the light emitted therefrom. Furthermore, the lighting devices are generally not able to reduce glare in a satisfactory manner.

[0004] It is therefore an object of the present invention to provide an alternative to existing lamps of the prior art in order to obtain a more decorative lighting whilst providing dynamic shading and reducing glare. Summary of the invention

[0005] It would therefore be of interest to overcome at least some of the deficiencies of current lamps of the prior art in order to provide a lighting device that can achieve decorative lighting while being able to provide dynamic shading of light emitted therefrom and reducing glare during operation.

[0006] This and other objects are achieved by providing a lighting device having the features of the independent claim.Preferred embodiments are defined in the dependent claims.

[0007] Therefore, according to the present invention, a lighting device comprising a plurality of light sources is provided. The lighting device also includes a cover, the cover includes a material that is at least partially translucent, wherein the cover at least partially surrounds the plurality of light sources. The lighting device also includes a plurality of reflectors, which are arranged in the cover and at corresponding peripheral portions of the cover. The first group of light sources is arranged in the plurality of reflectors, so that the light sources in each reflector are configured to emit corresponding light beams from the lighting device. The second group of light sources is arranged outside the plurality of reflectors and is configured to emit light from the lighting device. The lighting device also includes a control unit configured to individually control the operation of the first group of light sources and the second group of light sources.

[0008] Therefore, the present invention is based on the concept of a lighting device comprising at least two groups of light sources that can be controlled separately. The first group of light sources is arranged within a plurality of reflectors so that light emitted from the first group of light sources during operation of the lighting device is directed towards (discrete) parts of the exit surface of the cover of the lighting device. The second group of light sources is arranged outside the plurality of reflectors so that light emitted from the second group of light sources during operation of the lighting device leaves the lighting device through a mixing chamber defined by the cover of the lighting device. By means of this configuration, the lighting device can provide a dynamic shadow effect of the light emitted from the lighting device, wherein the sharpness of the shadow can be controlled by a control unit. By controlling (adjusting) the intensities of the first group of light sources and the second group of light sources via the control unit, the lighting device of the present invention can provide decorative lighting while providing dynamic shadows and reduced glare.

[0009] Here, the advantage of the present invention is that, through the innovative concept of the lighting device, the lighting device can achieve an aesthetically appealing lighting effect while at the same time at least partially reducing or even eliminating glare.

[0010] It will be appreciated that, furthermore, the lighting device of the present invention comprises relatively few parts. A relatively small number of parts is advantageous because the lighting device is relatively cheap to manufacture. Furthermore, a relatively small number of parts of the lighting device means that it is easier to recycle, especially compared to devices or apparatuses comprising a relatively large number of parts, which would hinder easy disassembly and / or recycling operations.

[0011] The lighting device comprises a plurality of light sources. The plurality of light sources are preferably light emitting diodes LED. The lighting device further comprises a cover comprising a material that is at least partially light-transmissive, wherein the cover at least partially surrounds the plurality of light sources. By the term "cover", it is meant here an enclosing element, such as a cap, a cover, a housing, etc., which comprises a material that is at least partially light-transmissive (e.g. a translucent and / or transparent material).

[0012] The housing defines a mixing chamber for at least a portion of the light emitted from the plurality of light sources during operation.By the term "mixing chamber" it is meant herein a space in which light may be reflected before leaving the mixing chamber.

[0013] The lighting device also includes a plurality of reflectors, which are arranged in the cover and at corresponding peripheral portions of the cover. The first group of light sources is arranged in the plurality of reflectors, so that the light source in each reflector is configured to emit a corresponding light beam from the lighting device. The second group of light sources is arranged outside the plurality of reflectors and is configured to emit light from the lighting device. Therefore, the light emitted from the second group of light sources is mixed in a mixing chamber defined by the cover of the lighting device, and the light emitted from the first group of light sources is at least partially emitted as a light beam via the plurality of reflectors.

[0014] The lighting device further comprises a control unit configured to individually control the operation of the first and second groups of light sources. By "control unit", it is here basically meant any unit, device, apparatus, etc. coupled or connected to the first and second groups of light sources so as to control the first and second groups of light sources, respectively. By the term "controlling the first and second groups of light sources", it may be here meant that the control unit is configured to control the intensity of light emitted from the first and second groups of light sources.

[0015] According to an embodiment of the invention, the control unit may be configured to vary the luminous flux of light emitted from at least one of the first group of light sources and the second group of light sources. It will be appreciated that the ratio between the luminous flux of light emitted from the first group of light sources and the second group of light sources may vary as a function of time. An advantage of this embodiment is that even more decorative lighting and dynamic shading of light emitted from multiple light sources may be obtained.

[0016] According to an embodiment of the present invention, the control unit may be configured to maintain the total luminous flux of light emitted from the first group of light sources and the second group of light sources constant as a function of time. In other words, the control unit may be configured to maintain or keep the total luminous flux of light emitted from the first group of light sources and the second group of light sources within a (relatively small) predetermined interval as a function of time. For example, the control unit may be configured to individually change the luminous flux of light emitted from the first group of light sources and the second group of light sources, although the total luminous flux remains constant as a function of time.

[0017] According to an embodiment of the present invention, the cover may include: a plurality of first portions arranged in front of each of the plurality of reflectors, respectively, and a second portion of the cover separated from the plurality of first portions, wherein the plurality of first portions include at least one characteristic different from at least one characteristic of the second portion. In other words, the plurality of first portions may include at least one characteristic (e.g., physical, mechanical and / or optical characteristic) different from at least one characteristic (e.g., physical, mechanical and / or optical characteristic) of the second portion. For example, and according to an embodiment, the surface area of ​​the plurality of first portions may be at least twice smaller than the surface area of ​​the second portion, the plurality of first portions may have a lower reflectivity than the second portion, and / or during operation, the maximum intensity of the light emitted from the plurality of light sources at the first portion may be at least twice as high as the maximum intensity at the second portion. The effect obtained by this embodiment is improved decorative lighting while providing dynamic shadows and reducing glare. The plurality of first portions may have the same shape, whereby the effect obtained includes improved shadows during operation of the lighting device. The reason is that the lighting device can provide the same type of shadow in each direction of the lighting device, for example, when a uniform mask / shadow device is applied. In addition, the plurality of first portions may have different shapes, such as a shape selected from the group consisting of a circle, an ellipse, a square, and a polygonal shape (e.g., a pentagonal shape, a hexagonal shape, or a heptagonal shape). In addition, the plurality of first portions may have a shape having a longest diameter and a shortest diameter, wherein a ratio between the longest diameter and the shortest diameter is in the range of 0.8 to 1.2. The effect obtained by this embodiment is an improved shading effect because these shapes have a substantially constant diameter in all directions.

[0018] According to an embodiment of the present invention, the first group of light sources may be configured to provide light having a first color temperature CT1, and the second group of light sources may be configured to provide light having a second color temperature CT2. The color temperature difference between the first color temperature and the second color temperature may be at least 300K, more preferably at least 500K, and most preferably at least 700K. By this feature, different color temperatures may be generated, for example because the lighting device may provide shadows and / or background lighting. Therefore, an advantage of this embodiment is that improved decorative lighting may be obtained. In addition, the color temperature difference between the first color temperature and the second color temperature may be less than 1200K, more preferably less than 1100K, and most preferably less than 1000K. An advantage of this embodiment is that a relatively small color temperature difference produces aesthetically desirable light, which in turn produces improved decorative lighting.

[0019] According to an embodiment of the present invention, the first color temperature and the second color temperature may be the same. An advantage of this embodiment is that the light emitted from the lighting device during operation may have a uniform color temperature, thereby producing uniform lighting.

[0020] Furthermore, the first color temperature and the second color temperature may be in the range of 1800 K to 5000 K, more preferably in the range of 1900 K to 4000 K, and even more preferably in the range of 2000 K to 3500 K. The first color temperature and the second color temperature may have a color rendering index of at least 80.

[0021] According to an embodiment of the present invention, the plurality of reflectors and the first group of light sources may be arranged in the lighting device such that the light beams emitted from the lighting device during operation have an overlap of less than 30%, preferably less than 25%, and even more preferably less than 20%. An advantage of this embodiment is that the overlap of the light emitted from the first group of light sources is relatively small, thereby enhancing the shadow quality.

[0022] According to an embodiment of the present invention, a plurality of reflectors and a first group of light sources may be arranged within the lighting device such that during operation, the light beams emitted from the lighting device have an overlap greater than 1%, preferably an overlap greater than 3%, and even more preferably an overlap greater than 5%. An advantage of this embodiment is that a minimum overlap of 1%, preferably a minimum overlap of 3%, and even more preferably a minimum overlap of 5% may create an even more uniform color shade of the light emitted from the lighting device.

[0023] According to an embodiment of the present invention, the reflectors of the plurality of reflectors may be arranged equidistantly along the periphery of the cover. The advantage of this embodiment is that the symmetrical arrangement of the plurality of reflectors of the lighting device contributes to the aesthetic appearance of the lighting device itself. In addition, the symmetrical arrangement of the plurality of reflectors contributes to the symmetrical emission of light from the lighting device, which further enhances the decorative aspect of the emitted light.

[0024] According to embodiments of the present invention, reflectors of the plurality of reflectors may be arranged along the periphery of the housing and may be separated by an angle of at least 20°, more preferably by an angle of at least 25°, and even more preferably by an angle of at least 30°.

[0025] According to embodiments of the present invention, the number of reflectors may be in the range of 2 to 5, more preferably 3 or 4, and even more preferably 3.

[0026] According to an embodiment of the present invention, the cover may include a plurality of holes, and each hole is arranged to allow a corresponding light beam from the lighting device to pass through. An advantage of this embodiment is that the lighting device can produce a shadow, wherein the sharpness of the shadow can be controlled by a control unit, which controls the light intensity from the first group of light sources and the second group of light sources, respectively. If the control unit controls the light intensity of the first group of light sources and the second group of light sources so that the intensity of the light emitted from the first group of light sources is set at a relatively high level, or even at a maximum level, and the intensity of the light from the second group of light sources is set at a relatively low level, at a minimum level, or in an off state, the lighting device is able to provide a sharp shadow. Another advantage of this embodiment is that the control unit can be configured to adjust the intensity of the light emitted from the first group of light sources and the second group of light sources so that the shadow contrast is adjusted.

[0027] According to an embodiment of the invention, the plurality of holes may be arranged equidistantly in the circumferential direction of the cover, and wherein the length between pairs of holes is at least 5 mm, more preferably at least 8 mm, and even more preferably at least 10 mm. An advantage of this embodiment is that the symmetrical arrangement of the plurality of holes of the lighting device contributes to the aesthetic appearance of the lighting device itself and the light emitted from the lighting device. Another advantage of this embodiment is that the (color) shading effect of the light from the lighting device during operation can be even further improved.

[0028] According to an embodiment of the invention, at least one reflector of the plurality of reflectors may be at least partially reflective.

[0029] According to an embodiment of the invention, at least one reflector of the plurality of reflectors may comprise an at least partially reflective layer.

[0030] According to an embodiment of the present invention, at least one reflector may have a reflectivity of >80%, more preferably a reflectivity of >85%, and even more preferably a reflectivity of >90%. An advantage of this embodiment is that the exemplified reflectivity provides a light beam having improved shading characteristics of the lighting device and improved decorative lighting, because the main part of the light emitted from the lighting device during operation is emitted from the first group of light sources and via the reflector. It will be appreciated that there may also be a difference between the reflectivity of the at least one reflector and the reflectivity of the hood. For example, the difference may be at least 30%. It will be appreciated that the relatively low reflectivity of the reflector provides an improved beam from the first group of light sources with respect to the shading effect of the emitted light.

[0031] According to an embodiment of the invention, the cover may have a reflectivity in the range of 20% to 70%, more preferably in the range of 25% to 60%, and even more preferably in the range of 30% to 50%. For example, the cover may constitute a semi-reflective light exit window. The effect obtained by this embodiment is uniform illumination and efficiency of the lighting device. It will be appreciated that the relatively high reflectivity of the cover results in a relatively high mixing of the light in the mixing chamber of the lighting device.

[0032] According to an embodiment of the invention, the shield may be bulb-shaped and may be elongated along an axis A, and wherein at least two reflectors of the plurality of reflectors are arranged in a plane B perpendicular to the axis A.

[0033] According to an embodiment of the present invention, during operation of the lighting device, the cover may have an absorption of less than 7%, more preferably less than 5%, most preferably less than 3%, such as 1% or even <1%. An advantage of this embodiment is that it has a relatively high mixing efficiency in the mixing chamber of the lighting device.

[0034] According to an embodiment of the invention, the shield may be bulb-shaped and may be elongated along an axis A, and wherein at least one reflector of the plurality of reflectors is arranged at an end of the shield.

[0035] According to an embodiment of the present invention, the light sources in the plurality of light sources are light emitting diodes (LEDs).

[0036] According to an embodiment of the present invention, there is provided a lighting device elongated along a main axis A. The lighting device comprises a lighting apparatus according to any of the aforementioned embodiments, wherein the lighting apparatus is arranged at a first end of the lighting device. The lighting device further comprises an electrical connection portion connected to the lighting apparatus for supplying current to a plurality of light sources, wherein the electrical connection portion is arranged at a second end of the lighting apparatus opposite to the first end. An advantage of this embodiment is that the lighting device according to the present invention can be conveniently arranged in substantially any lighting device such as an LED lamp, a lamp, a lighting system, etc.

[0037] Other 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

[0038] This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiments of the invention.

[0039] Figure 1a and Figure 1bschematically shows a cross section of a lighting device according to an exemplary embodiment of the present invention,

[0040] Figure 2 A schematic diagram showing shadow quality and glare reduction as a function of the intensity of light emitted from a first group of light sources and a second group of light sources.

[0041] Figure 3a and Figure 3b schematically shows a cross section of a lighting device according to an exemplary embodiment of the present invention,

[0042] Figure 4a , Figure 4b and Figure 4c schematically shows a light distribution pattern from a lighting device according to an exemplary embodiment of the present invention, and

[0043] Figure 5a and Figure 5b A lighting device according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0044] Figure 1a A cross section of a lighting device 100 according to an exemplary embodiment of the present invention is schematically shown. More specifically, FIG. 1 shows a cross section of a cover 120 of the lighting device 100, wherein the cover 120 at least partially surrounds a plurality of light sources 110. It will be appreciated that the cross section of the cover 120 need not be circular, but may take substantially any shape. The cover 120 comprises a material that is at least partially light-transmissive. The cover 120 may be a diffuser, i.e., the cover 120 may be configured to diffuse and / or scatter light emitted from the plurality of light sources 110 during operation of the lighting device 100. The plurality of light sources 110 are divided into a first group of light sources 140 and a second group of light sources 150. It will be appreciated that the light sources (e.g., LEDs) in the first group of light sources 140 and the second group of light sources 150 may be of the same kind or type. The lighting device 100 comprises a plurality of reflectors 130, which are schematically indicated as arches and are arranged within the cover 120. The reflectors 130 are arranged at respective peripheral portions of the cover 120. Each light source 110 of the first group of light sources 140 is arranged within a respective reflector 130. In this manner, each light source 110 of the first group of light sources 140 arranged within a respective reflector 130 is configured to emit a respective light beam from the lighting device 100 during operation of the lighting device 100.

[0045] The second group of light sources 150 of the lighting device 100 is arranged outside the plurality of reflectors 130, and the light sources 110 in the second group of light sources 150 are arranged at corresponding peripheral portions of the cover 120. Figure 1aIn the exemplary configuration of the lighting device 100 in FIG. 1 , the light sources 110 in the first group of light sources 140 and the second group of light sources 150 are arranged at the periphery of the cover 120 in an alternating manner. The illustrated lighting device 100 includes four light sources 110 in the first group of light sources 140 and four light sources 110 in the second group of light sources 150. The number of light sources 110 in the first group of light sources 140 (and the number of corresponding reflectors 130) may preferably be in the range of 2 to 5, more preferably 3 or 4, and even more preferably 3. However, it should be noted that the number of light sources 110 in the first group of light sources 140 and the second group of light sources 150 may be selected arbitrarily. The second group of light sources 150, which is arranged outside the plurality of reflectors 130 and within the mixing chamber of the cover 120, among the plurality of light sources 110, is configured to emit light from the lighting device 100.

[0046] Figure 1a The lighting device 100 in the embodiment further comprises a control unit 160. Here, the control unit 160 is only schematically indicated and is connected to the plurality of light sources 110 of the lighting device 100 via wiring or by wireless technology. It will be appreciated that the control unit 160 may be integrated within the lighting device 100. The control unit 160 is configured to individually control the operation of the light sources 110 in the first group of light sources 140 and the second group of light sources 150. Figure 1a As illustrated in FIG. 1 , the control unit 160 may control the first group of light sources 140 and the second group of light sources 150 so that the intensity of light emitted from the first group of light sources 140 is the same as the intensity of light emitted from the second group of light sources 150. Therefore, the control unit 160 may control the light sources 110 in the first group of light sources 140 and the second group of light sources 150 so that the intensity of light emitted from the lighting device 100 is substantially constant in the omnidirectional direction of the lighting device 100.

[0047] The first group of light sources 140 may be configured to provide light having a first color temperature CT1, and the second group of light sources 150 may be configured to provide light having a second color temperature CT2. The color temperature difference between the first color temperature and the second color temperature may be 300K to 1200K, more preferably 500K to 1100K, and most preferably 700K to 1000K. It will be appreciated that the first color temperature 140 and the second color temperature 150 may be the same. Furthermore, the first color temperature 140 and the second color temperature 150 may be in the range of 1800K to 5000K, more preferably in the range of 1900K to 4000K, and even more preferably in the range of 2000K to 3500K. The first color temperature 140 and the second color temperature 150 may have a color rendering index of at least 80.

[0048] The reflector 130 may have a reflectivity of >80%, more preferably a reflectivity of >85%, and even more preferably a reflectivity of 90%. The cover 120 may have a reflectivity in the range of 20% to 70%, more preferably a reflectivity in the range of 25% to 60%, and even more preferably a reflectivity in the range of 30% to 50%. Furthermore, during operation of the lighting device 100, the cover 120 may have an absorption of less than 3%, such as 1% or even <1%.

[0049] Figure 1b Schematically shows the Figure 1a The cross-section of the lighting device 100 is the same as the cross-section shown in FIG. 1 , and in order to improve the understanding of the arrangement and function of the lighting device 100, reference is made here to FIG. Figure 1a .exist Figure 1b In the embodiment, the control unit 160 controls the light sources 110 in the first and second light source groups 140 and 150 so that the intensity of light emitted from the first light source group 140 is higher than the intensity of light emitted from the second light source group 150. For example, the control unit 160 may turn off the second light source group 150. Figure 1b The emission of a respective light beam from each light source 110 of the first group of light sources 140 of the lighting device 100 arranged within a respective reflector 130 during operation of the lighting device 100 is clearly disclosed.

[0050] exist Figure 1a and Figure 1b In the embodiment, a plurality of reflectors 130 and a first group of light sources 140 are arranged equidistantly in the lighting device 100 and at the periphery of the cover 120. By this arrangement, and as Figure 1b As indicated in , during operation, the light beams emitted from the first group of light sources 140 of the lighting device 100 do not overlap. For possible configurations of the first group of light sources 140 and / or the second group of light sources 150 in the lighting device 100, it is preferred that the overlap of the light beams emitted from the first group of light sources 140 and the second group of light sources 150 is less than 30%, preferably less than 25%, and even more preferably less than 20%. In addition, according to Figure 1a and Figure 1b In an embodiment of the lighting device 100, the reflectors in the plurality of reflectors 130 are separated by an angle of 90°. It will be appreciated that the plurality of reflectors 130 may be separated by an angle of at least 20°, preferably at least 25°, and even more preferably at least 30° relative to the central portion of the housing.

[0051] from Figure 1a Example to Figure 1bFor example, it will be appreciated that the control unit 160 of the lighting device 100 can control the light emitted from the light sources 110 in the first group of light sources 140 and the second group of light sources 150. In other words, the control unit 160 can be configured to maintain and / or increase the intensity of the light from the light sources 110 in the first group of light sources 140, and dim and / or turn off the light sources 110 in the second group of light sources 150. Figure 1a to Figure 1b In such variations in the intensity of light emitted from the first and second groups of light sources 140, 150 of the lighting device 100, the control unit 160 may still be configured to maintain a total luminous flux of light emitted from the first and second groups of light sources 140, 150 as a function of time.

[0052] exist Figure 1a and Figure 1b , the cover 120 of the lighting device 100 includes a plurality of first portions 111 respectively arranged in front of each of the plurality of reflectors 130. The cover 120 also includes a second portion 112 of the cover 120 separated from the plurality of first portions 111 of the cover 120. The relative characteristics between the plurality of first portions 111 and the second portion 112 of the cover 120 may satisfy one or more of the following: for example, the surface area of ​​the plurality of first portions 111 of the cover 120 may be at least two times smaller than the surface area of ​​the second portion 112 of the cover 120. In addition, the plurality of first portions 111 of the cover 120 may have a lower reflectivity than the second portion 112 of the cover 120. According to another example, the maximum intensity of light emitted from the plurality of light sources 110 at the plurality of first portions 111 during operation may be at least two times higher than the maximum intensity of light emitted from the plurality of light sources 110 at the second portion 112 during operation.

[0053] Figure 2 A schematic diagram of the shadow quality SQ and glare reduction GR of the light emitted from the lighting device of the present invention is shown as a function of the intensity I1 of the light emitted from the first group of light sources and the intensity I1+I2 of the light emitted from the first group of light sources and the second group of light sources, which are controlled by the control unit. In the left-hand part of FIG. 3 , the control unit controls the light intensity of the first group of light sources and the second group of light sources by operating the first group of light sources, i.e., with a relatively high (or maximum) level of I1, while setting the intensity I2 of the light emitted from the second group of light sources at a relatively low level, a minimum level, or even in an off state. Thus, in the left-hand part of FIG. 3 , the control unit controls the light intensity of the first group of light sources and the second group of light sources by operating the first group of light sources, i.e., with a relatively high (or maximum) level of I1, while setting the intensity I2 of the light emitted from the second group of light sources at a relatively low level, a minimum level, or even in an off state. Figure 2 The light emitted from the lighting device during operation of the left-hand portion of the control unit is substantially or completely emitted from the first group of light sources. At this setting of the control unit, the shadow quality SQ of the light emitted from the lighting device is at a relatively high level, or even at a maximum level, while the glare reduction GR is at a relatively low level, or even at a minimum level.

[0054] exist Figure 2In the right-hand part of the embodiment, the control unit controls the light intensity of the first and second groups of light sources by operating the first group of light sources, i.e., I1 having a relatively high (or maximum) level, while setting the intensity I2 of the light emitted from the second group of light sources at a relatively high level or even at a maximum level. For example, the control unit can be configured to set the intensity of the light emitted from the first and second groups of light sources at the same level. At such a setting of the control unit, the shadow quality SQ of the light emitted from the lighting device is at a relatively low level or even at a minimum level, while the glare reduction GR is at a relatively high level or even at a maximum level.

[0055] Figure 3a and Figure 3b Schematically shows a cross section of a lighting device 100 according to an exemplary embodiment of the present invention. Figure 3a In the example, the lighting device 100 includes a cover 120, which includes a material that is at least partially light-transmissive. According to this example, two light sources 110 in the first group of light sources 140 and two light sources 110 in the second group of light sources 150 are arranged in the cover 120. However, it will be appreciated that the lighting device 100 can basically include any number of light sources 110 in the first group of light sources 140 and / or the second group of light sources 150. Figure 3a , each light source 110 in the first group of light sources 140 is arranged in a corresponding reflector 130, and each light source 110 in the second group of light sources 150 is arranged outside the reflector 130. The light sources 110 in the first group of light sources 140 and / or the second group of light sources 150 may be LEDs. The light sources 110 are arranged on a single PCB 135, which may be flat or non-flat. According to the lighting device 100 according to the aforementioned embodiment, the light sources 110 in the first group of light sources 140 arranged in the reflector 130 are configured to emit corresponding light beams from the lighting device 100. Here, the light beams emitted from the first group of light sources 140 are mainly emitted in a plane parallel to the axis B, for example, in a horizontal direction and / or in a horizontal plane according to the orientation of the lighting device 100 in the figure. Therefore, the first group of light sources 140 and the reflector 130 are arranged so that the light beams are parallel to the axis B, i.e., emitted from the lighting device 100 in the periphery and plane direction of the cover 120 of the lighting device 100. Furthermore, light sources 110 in the second group of light sources 150 are configured to emit light from the lighting device 100. Here, the light emitted from the second group of light sources 150 is mainly emitted parallel to the axis A, i.e. in a vertical direction and / or in a vertical plane depending on the orientation of the lighting device 100 in the figure.

[0056] Figure 3b Shown with Figure 3a The lighting device shown in FIG. 1 is similar to the lighting device 100, and for improved understanding, reference is made to FIG. Figure 3a .exist Figure 3b In the embodiment, four light sources 110 in the first group of light sources 140 and four light sources 110 in the second group of light sources 150 are provided, which are arranged in the housing 120. However, it will be appreciated that the lighting device 100 may include substantially any number of light sources 110 in the first group of light sources 140 and / or the second group of light sources 150. Figure 3b , four reflectors 130 are provided, and each light source 110 of the first group of light sources 140 is arranged within the corresponding reflector 130. Similarly, each light source 110 of the second group of light sources 150 is arranged outside the reflector 130. One or more light beams emitted from the first group of light sources 140 during operation of the lighting device 100 may be emitted in a plane parallel to the axis B, i.e., in a horizontal direction and / or in a horizontal plane. In addition, one or more light beams emitted from the first group of light sources 140 during operation of the lighting device 100 may be emitted in a direction / plane inclined relative to the axis B. For example, according to Figure 3b , which is obliquely upward. In addition, according to Figure 3b In an exemplary embodiment, the light sources 110 in the second group of light sources 150 are configured to emit light from the lighting device 100 in an upward direction parallel to the axis A and / or in a plane.

[0057] Figure 4a , Figure 4b and Figure 4c Schematically illustrates a light distribution pattern from a lighting device according to an exemplary embodiment of the present invention. The light distribution pattern is a result (effect) of the operation of a lighting device utilizing one or more of a plurality of reflectors, the one or more reflectors comprising an at least partially reflective (semi-reflective) layer, such as a diffuser. Figure 4a In the embodiment of the present invention, the light distribution pattern is substantially circular in the periphery and in the planar direction of the housing of the lighting device. Figure 4b In , the light distribution pattern comprises four circles in the periphery and in the plane direction of the housing of the lighting device. Here, there are four overlapping areas of the four light beams emitted from the lighting device during operation. Figure 4c In , the light distribution pattern comprises three circles in the periphery and planar direction of the housing of the lighting device. Here, there are three overlapping areas of the three light beams emitted from the lighting device during operation.

[0058] Figure 5a and Figure 5b FIG. 8 shows the operation of the lighting device 800 according to an exemplary embodiment of the present invention. Figure 5a, the lighting device 800 is elongated along the main axis A. The lighting device 800 comprises a lighting device 100 according to any of the previous embodiments, i.e., the lighting device 100 comprises a cover 120, a plurality of reflectors, a first group of light sources and a second group of light sources (not shown), and a control unit 160, the control unit 160 being configured to individually control the operation of the first group of light sources and the second group of light sources. The lighting device 800 also comprises an electrical connection 830 connected to the lighting device 100 for supplying current to the plurality of light sources of the lighting device 100.

[0059] The operation of the lighting device 800 corresponds to Figure 1a , that is, the intensity of the light emitted from the first group of light sources is the same as the intensity of the light emitted from the second group of light sources. Therefore, the control unit 160 controls the light sources in the first group of light sources and the second group of light sources so that the intensity of the light emitted from the lighting device 800 is substantially constant in the omnidirectional direction of the lighting device 800.

[0060] The cover 120 of the lighting device 800 includes a plurality of holes 200 through which Figure 5b The holes 200 are respectively arranged at the plurality of reflectors and the corresponding light sources in the first group of light sources, so that each hole in the plurality of holes 200 is arranged to transmit (allow the corresponding light beam to pass) the corresponding light beam from the lighting device 100. Figure 5b , the operation of the lighting device 800 corresponds to Figure 1b The operation illustrated in FIG. 1 is that the control unit 160 controls the light sources in the first and second light sources groups so that the intensity of light emitted from the first light sources group is higher than the intensity of light emitted from the second light sources group.

[0061] Those skilled in the art will appreciate that the present invention is by no means limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims. For example, one or more of the cover 120, the reflector 130, the first group of light sources 140 and / or the second group of light sources 150, etc. may have shapes, sizes and / or dimensions different from those depicted / described.

Claims

1. A lighting device (100), comprising: a plurality of light sources (110), a housing (120) comprising an at least partially light-transmissive material and elongated along an axis A, wherein the housing at least partially surrounds the plurality of light sources and defines a mixing chamber (125) for at least a portion of the light emitted from the plurality of light sources during operation, and a plurality of reflectors (130) arranged within the cover and at respective peripheral portions of the cover, wherein a first group of light sources (140) of the plurality of light sources are arranged within the plurality of reflectors such that the light sources within each reflector are configured to emit a corresponding light beam from the lighting device, and wherein a second group of light sources (150) of the plurality of light sources is arranged outside the plurality of reflectors and is configured to emit light from the lighting device, The lighting device further comprises a control unit (160) configured to individually control the operations of the first group of light sources and the second group of light sources, and wherein at least two of the plurality of reflectors are arranged in a plane B perpendicular to the axis A, or wherein at least one of the plurality of reflectors is arranged along the axis A and is arranged at an end of the hood, wherein the cover is bulb-shaped or elongated along a main axis A, wherein the cover comprises: a plurality of first portions (111) respectively arranged in front of each of the plurality of reflectors, and a second portion (112) of the cover separated from the first portions, wherein at least one characteristic included in the plurality of first portions is different from at least one characteristic of the second portions, and The plurality of first portions have a lower reflectivity than the second portion. 2 . The lighting device according to claim 1 , wherein the control unit is configured to change a luminous flux of light emitted from at least one of the first group of light sources and the second group of light sources.

3. The lighting device according to any of the preceding claims, wherein the control unit is configured to maintain a total luminous flux of light emitted from the first group of light sources and the second group of light sources constant as a function of time.

4. The lighting device according to claim 1, satisfying at least one of the following conditions: The surface area of ​​the plurality of first portions is at least two times smaller than the surface area of ​​the second portion, and A maximum intensity of light emitted from the plurality of light sources at the first portion during operation is at least twice as high as a maximum intensity at the second portion.

5. The lighting device of any one of claims 1, 2 and 4, wherein the plurality of reflectors and the first group of light sources are arranged within the lighting device such that the light beams emitted from the lighting device during operation have an overlap of less than 30%.

6. The lighting device of any one of claims 1, 2 and 4, wherein the plurality of reflectors and the first group of light sources are arranged within the lighting device such that the light beams emitted from the lighting device during operation have an overlap of less than 25%.

7. The lighting device of any one of claims 1, 2 and 4, wherein the plurality of reflectors and the first group of light sources are arranged within the lighting device such that the light beams emitted from the lighting device during operation have an overlap of less than 20%.

8. The lighting device according to any one of claims 1, 2 and 4, wherein reflectors of the plurality of reflectors are arranged equidistantly along the periphery of the cover.

9. The lighting device according to any one of claims 1, 2 and 4, wherein the number of reflectors is in the range of 2 to 5.

10. The lighting device according to any one of claims 1, 2 and 4, wherein the number of reflectors is 3 or 4.

11. The lighting device according to any one of claims 1, 2 and 4, wherein the number of reflectors is three.

12. The lighting device according to any one of claims 1, 2 and 4, wherein the cover comprises a plurality of holes (200), and wherein each hole is arranged to pass a corresponding light beam from the lighting device.

13. The lighting device according to claim 12, wherein the plurality of holes are arranged equidistantly in a circumferential direction of the cover, and wherein a length between pairs of holes is at least 5 mm.

14. The lighting device according to claim 12, wherein the plurality of holes are arranged equidistantly in a circumferential direction of the cover, and wherein a length between pairs of holes is at least 8 mm.

15. The lighting device according to claim 12, wherein the plurality of holes are arranged equidistantly in a circumferential direction of the cover, and wherein a length between pairs of holes is at least 10 mm.

16. The lighting device of any one of claims 1, 2, 4, and 13-15, wherein reflectors of the plurality of reflectors are arranged along a perimeter of the cover and are separated by an angle of at least 20° relative to a center point of the cover.

17. The lighting device of any one of claims 1, 2, 4, and 13-15, wherein reflectors of the plurality of reflectors are arranged along a perimeter of the housing and are separated by an angle of at least 25° relative to a center point of the housing.

18. The lighting device of any one of claims 1, 2, 4, and 13-15, wherein reflectors of the plurality of reflectors are arranged along a perimeter of the cover and are separated by an angle of at least 30° relative to a center point of the cover.

19. The lighting device of any of claims 1, 2, 4, and 13-15, wherein the at least one reflector has a reflectivity > 80%.

20. The lighting device of any of claims 1, 2, 4, and 13-15, wherein the at least one reflector has a reflectivity > 85%.

21. The lighting device of any one of claims 1, 2, 4, and 13-15, wherein the at least one reflector has a reflectivity of 90%.

22. A lighting device (800) extending along a main axis A, the lighting device comprising: A lighting device according to any one of the preceding claims, wherein the lighting device is arranged at a first end of the lighting arrangement, and An electrical connection (830) connected to the lighting device for supplying current to the plurality of light sources, wherein the electrical connection is arranged at a second end of the lighting device opposite to the first end.

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