WO2021005029A1

WO2021005029A1 - Lighting device, luminaire, lighting system and use thereof

Info

Publication number: WO2021005029A1
Application number: PCT/EP2020/069060
Authority: WO
Inventors: Bianca Maria Irma Van Der Zande; Anna Wilhelmina Maria DE BEST; Rémy Cyrille BROERSMA; Tobias BORRA; Marcus Theodorus Maria LAMBOOIJ
Original assignee: Signify Holding B.V.
Priority date: 2019-07-11
Filing date: 2020-07-07
Publication date: 2021-01-14

Abstract

The invention relates to a lighting device with integrated UV-sources and light sources, wherein the light sources have a different spatial distribution than the UV sources. Because of the special arrangement of the UV sources and/or of the specific distribution of provided power over the plurality of UV sources, the UV irradiance distribution is relatively flat both at 20 cm from the exit window of the UV emitting device and at the target position of the human (about 0.5-2m from the exit window). Hence, the proposed solution typically results in a UV-device wherein the light sources and/or UV-sources are LEDs with a non- uniform UV-LED distribution on the LED board yet creating a relatively flat, uniform UV-B distribution on a desk at about 1 m distance from the UV-device, while reducing actinic UV dose at 20 cm and providing a beneficial UV-dose, i.e. < 0.7 SED, at user's position.

Description

LIGHTING DEVICE, LUMINAIRE, LIGHTING SYSTEM AND USE THEREOF

FIELD OF THE INVENTION

The invention relates to a lighting device, a luminaire, a lighting system and use thereof for simultaneously illumination and UV-treatment.

BACKGROUND OF THE INVENTION

Implementing a non-visual lighting component into a lighting system can be beneficial from a user perspective. Examples hereof are e.g. UV-B, which regulates vitamin D production. The literature shows a multitude of beneficial effects of e.g. (near)infra-red and UV-B on amongst others mood and general wellbeing. Other benefits of UV-B radiation are positive effects on blood pressure, cardiovascular health, multiple sclerosis etc. However, adding e.g. UV-B to general lighting might induce photobiological safety hazards. Hence, the benefit of a component such as this will only be realized if the user is safely exposed to it. In practice the humans exposed to the UV radiation are generally positioned at a distance of 0.5 meter to 2 meter from the UV emitting device. On the other hand, the photobiological safety hazards requires that the irradiance [W/m2] should remain below a certain dose during a certain period of time, this is determined according to standard at 20 cm from the exit window of a UV emitting device at the x,y position with the highest irradiance level. In most cases this will be the center of the exit window (on the optical axis). Hence the problem in the prior art arises how to expose the humans to sufficient UV and at the same time not to exceed the standards of photobiological safety.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a UV emitting device in which the abovementioned problem of the prior art is solved. Thereto the invention proposes as a first solution a lighting device comprising a plurality of light sources and a plurality of UV- sources, wherein:

- the UV-sources are mutually arranged in an arrangement with a varying UV- source pitch wherein the UV-source pitch in a central region is larger than the UV-source pitch in an outer region of said arrangement, or - the UV sources are arranged in cells of constant cell size of a 2D matrix, wherein a first occupancy degree of the cells in a central region is less than a second occupancy degree in an outer region of said 2D matrix. For example, the arrangement of the light sources built-up a (virtual) 2D-matrix of matrix cells, said 2D-matrix comprises an outer region and a central region, the UV-source pitch in the central region is larger than the UV- source pitch in the outer region.

The matrix comprises at least 8 cells, i.e. is 2*4 cells or 4* 2 cells, for example 12 cells like 2*6 cells or 4*3, or 36 cells such as 4*9, 3*12 or 6*6 cells, even op to 1200 or 10000 cells. In the case the matrix has a dimension of only 2 rows or 2 two columns, then the outer region relates respectively to the begin and end column respectively to the begin and end row. The lighting device could have the feature that the light sources and/or UV-sources are point-size like light sources, such as LEDs. Such light sources are cheaply and easily mountable on a board, such as mounted LEDs, for example at least one of Red, Green, Blue, White, and Amber (RGBWA) on a printed circuit board (PCB). The same applies to UV- sources being UV-LEDs.

A second solution for the abovementioned problem is by providing a lighting device comprising a plurality of light sources, the arrangement of the light sources built-up a (virtual) 2D-matrix of matrix cells, said 2D-matrix comprises an outer region and a central region,

wherein the light sources are LEDs and each LED comprises a package of an UV die and a VIS die, wherein at least one UV-die in the central region is driven at a lower power than the UV-die in the outer region. In this solution the LEDs preferably are chosen from W-UV-LEDs, RGB -UV-LEDs, RGBW-UV-LEDs, RGBWA-UV LEDs.

For generating the Vitamin-B in the human body, the UV-B radiation conveniently is administered to the human via the skin. However, at the same time the skin is exposed to the UV-B radiation, so are the eyes of the human. To counteract damage to the eyes by the amount of UV-B radiation necessary for the Vitamin D generation, it is advantageous of combining and/or integrating the UV-sources with light sources in a single lighting device. Thereto the visual light sources shoud have a relatively high brightness providing visual conditions in which there is excessive contrast or an inappropriate distribution of light sources that demotivates, discourages or refrains the observer to look directly towards the light source. This reduces humans looking directly into the light sources and UV-sources because of the high brightness of visible light provided by the light sources, thus counteracting the risk of UV-radiation in too high intensity being administered to the human body via the eyes. Implicitly, this means for the level of brightness that the brightness of the light sources exceeds the well-known Unified Glare Rating (UGR), which is basically the logarithm of the glare of all visible lamps, divided by the background lumination. Thus, at a brightness level of at least the UGR or higher, the effect of discouraging observers of looking directly to the light source is attained. Hence, the invention typically relates to a lighting device providing simultaneously UV and visible radiation, wherein the brightness of visible radiation is equal to or higher than the upper value of the UGR at which glare is avoided for the specific, actual situation. For example, for offices areas an upper boundary value of the UGR for avoiding glare typically is 19, while for circulation areas the typical upper boundary value of the UGR for avoiding glare is 28, hence the value of the UGR should then be at least 19 respectively 28.

It is desired to administer the UV dose to the humans by diffuse emitting sources to counteract the risk on too high UV radiation intensity in some directions. Diffuse UV-sources typically issue UV-radiation in an isotropic manner, i.e. with an intensity that is independent of a viewing angle under which an observes looks at the translucent surface portions, whereas the light sources may provide anisotropic luminance, i.e. luminance depending on viewing angle of the observer looking at the light exit areas. Hence, the UV sources preferably are diffusely emitting sources, for example having a beam width at FWHM of at least 60°, for example 90°. Because of this beam width, beams of adjacent UV sources overlap at distances in the order of or larger than the pitch between the UV sources leading to locally increased UV irradiance levels. Both the first and second solution are based on the common inventive concept of integrating a UV emitting device with a light emitting device with a specific UV beam profile of the UV beam issued by the plurality UV sources wherein the add up of individual UV beams to render a local peak irradiance to be above a specified threshold level/value is counteracted. In more detail, the light emitting device comprises a 2D matrix built up by the light sources, wherein the light sources are arranged typically in a regular manner, i.e. are evenly distributed over matrix cells of said 2D matrix to endeavor a uniform light distribution on a target area, and provide a light beam with a highest luminous intensity in the center of the light beam leading to an illuminance distribution that typically gradually and constantly decreases from center towards the periphery of the light beam. The combined UV beam formed by the sum of individual beams as emitted by the plurality of UV sources at the location where the UV is to be administered to humans, has a different distribution. In particular, because of the special arrangement of the UV sources and/or of the specific distribution of provided power over the plurality of UV sources, the UV irradiance distribution both at about 20 cm form the exit window of the UV emitting device and at the target position of the human (at a distance in the order of 0.5-2m from the exit window, could also be referred to as "far field") is relatively flat. The expression "relatively flat" in this context means that the irradiance difference is at the most ± 50% over a plane defined by a top angle of 90° around an optical axis of the UV beam as issued by the UV device.

Hence, the proposed solution typically results in a UV-device wherein the light sources and/or UV-sources are LEDs with a non-uniform UV-LED distribution on the LED board yet creating a relatively flat, uniform UV-B distribution on a target area, for example a desk at about 1 m below (with respect to the direction of gravity) the UV-device, while reducing actinic UV dose at 20 cm and providing for the benefits for the user at the user position (i.e. < 0.7 SED at user’s position). The most urgent problem the current invention solves is providing a uniform UV-B light distribution on user’s position, while the photobiological safety at 20 cm is maintained by a non-uniform UV-B LED distribution on the LED board. This is a relatively cheap, easy to apply solution since an advanced optical design of diffuser plates is not required anymore. The non-uniform UV-LED distribution can be the result of the following features:

- the plurality of light sources being distributed over said matrix cells with a pitch having a spreading in light source pitch smaller than a spreading in UV-source pitch, for example wherein the plurality of UV-sources being non-evenly distributed over said matrix cells in said 2D-matrix with the density of UV-sources in the outer region being higher than the density of UV sources in the central region and/or intermediate region.

- this non-evenly distribution can for example be obtained by each matrix cell of the 2D-arrangement being provided with a single light source and 50%-90% of the matrix cells are each provided with a single UV-source with matrix cells not occupied by UV- sources being in the intermediate and/or central region.

- or alternatively or additionally, wherein essentially each matrix cell, i.e. at least 92%, of the 2D-arrangement is provided with a single light source and a UV-source wherein 10%-50% of the matrix cells in the outer region are each provided with an additional UV-source.

- alternatively and/or additionally the lighting device could have the feature that the 2D-matrix is an x-y-matrix with constant size of the matrix cells in x-direction and/or y-direction, preferably an orthogonal x-y-matrix, or that the lighting device has the feature that the 2D-matrix is an x-y-matrix with increasing size of the matrix cells from the outer region to the central region in x-direction and/or y-direction, preferably the matrix cells in the central region having a size of at most twice the size of the matrix cells in the outer region.

All said features mentioned above aim at attaining said relatively flat, uniform UV irradiance distribution at the target area and counteracting a too high peak value of UV at 20 cm distance from the UV-emitting device.

The lighting device could have the feature that the UV-sources are UV-B- sources, i.e. emit radiation in the UV-range with a peak in the wavelength range of 280-320 nm. The 280nm to 320nm wavelength range is typically a favorable wavelength range for humans for generating vitamin D in the human body. Yet, the UV-sources could be a UV-C source (< 280nm), or a UV-A source (320nm to 400nm). The UV-source could optionally be combined with an emission of deep blue radiation (deep blue being 400nm to 460nm) or with an emission of IR-radiation (IR being 780nm to 3000nm), depending on the desired biological/physiological effect.

The invention further relates to a luminaire wherein the light sources and UV- sources are mounted, preferably on a board, in a housing and covered with a UV-VIS transmissive cover, wherein the cover preferably is translucent to attain the diffuse emission of UV-radiation as explained earlier. The luminaire could have the feature that wherein the UV-VIS transmissive cover comprises a plurality of UV-VIS transmissive windows arranged in a 2D-arrangement and separated by opaque regions, said 2D arrangement matching and being aligned with the positions of the UV sources, said UV sources facing towards said windows. The luminaire could have the feature that the light sources are arranged on opaque cover portions and face away from the windows towards the UV-sources. The visible light from the light sources first have to be reflected by the board on which the UV sources are mounted, before exiting through the UV-VIS windows to the exterior. The housing then functions like a mixing box for the visible light. This provides a relatively uniform beam of visible light to be issued from the windows with a relatively constant intensity, while the amount of UV issued from respective windows may vary substantially. Thus an easy, independent control of the amount of visible light and the amount and beam of UV-radiation to be issued from the windows is attainable.

The luminaire could have the feature that each window forms an exit window of a single associated reflector compartment comprising a respective associated matrix cell. This provides an improved beam pattern control of the light/UV beam as issued by the luminaire. It is further convenient that the luminaire is one of a suspended luminaire, ceiling/wall recessed luminaire, free floor standing luminaire. The desired type of luminaire depends on the application, i.e. if one wants to have a dedicated room for UV treatment, for which one can use recessed or fixedly suspended luminaires or if one wants to combine (unobtrusive) UV treatment with general illumination in which a moveable, free floor standing luminaire can be preferred.

The invention further relates to a lighting system comprising at least two luminaires (not forming a continuous line) of the invention and at least one user interface selected from on/off button, remote control, mobile device. This provides an easy use and adaption of the settings of the light system. Preferably, the two luminaires are not forming a continuous line as in a continuing line of luminaires, the beams of the UVB sources at the end of the first luminaire could overlap with those at the front of the second luminaire, leading to increased irradiance levels at short distance. Of course this could be considered when one still want to arrange the two (or more )luminaires in a continuous line by rearrangement of the UV-sources in the adjacent outer regions of said two (or more) luminaires.

The invention still further relates to use of the lighting device according to the invention and/or the luminaire according to the invention and/or lighting system according to the invention for managing of vitamin D in humans. The use can be either a dedicated (medical) treatment, during (supervised) treatment period or an unobtrusive treatment, but yet carefully dosed, as additional feature to and during normal (for example office) illumination.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now further be elucidated by means of the schematic drawings that are by no means intended to limit the invention but rather serve to illustrate the ample possibilities of the invention. In the schematic drawings

Fig. 1 A-B shows a schematic perspective worked open front view respectively a cover of a first embodiment of a luminaire according to the invention;

Fig. 2 shows a schematic cross-section of a second embodiment of a luminaire according to the invention;

Fig. 3 A-D shows a schematic bottom view of a prior art lighting device, respectively lighting devices according to the invention;

Fig. 4 shows a schematic view of a free standing luminaire according to the invention positioned over a desk;

Fig. 5 shows a lighting system according to the invention; and Fig. 6 shows an intensity pattern of UV-B -radiation at desk level on a desk plane.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Fig. 1 A shows a schematic perspective view of the inside of a housing 3 of a worked open first embodiment of a luminaire 1 according to the invention. The housing accommodates a plurality of UV-sources 5, in the figure a plurality of Lambertian emitting UV-B LEDs mounted on a reflective metal board 7, though also other type of LEDs, such as Gaussian emitting LEDs, can be used. The UV-sources facing away from the board are arranged in a matrix comprising 2 rows 1R,2R and 6 columns 1C..6C, hence a 2*6 cells matrix. The first occupancy degree of cells by UV-sources in the central region 9, i.e.

columns 2 to 5 2C...5C, is less than the second occupancy degree in an outer region 11 of the matrix, i.e. columns 1C,6C. In particular the positions for UV-sources at positions 1R-3C and 2R-4C are kept empty. The housing of the luminaire is to be closed by a cover 13 as shown in Figure IB. Said cover 13 comprises a white reflective coated opaque region 15 upon which a plurality of light sources 17, in the figure a plurality of Lambertian emitting white LEDs, are mounted in a linear array. Alternatively, one large diffuser cover can be used. The cover further comprises a plurality of UV-VIS transmissive diffuser windows 19, which align with the UV-sources when the cover is mounted onto the housing of the luminaire. Mounting of the cover onto the housing of the luminaire is done with the plurality of light sources facing (and emitting during operation) towards the metal reflective board 7 on which the UV- sources are mounted. The closed housing then functions as a mixing box for the white light sources, resulting in emission of uniform , homogeneous visible light from the windows, while the UV-sources, mounted directly behind the windows, directly emit UV-radiation through the windows, essentially without being mixed in the housing. Thus individual beam and intensity control of UV radiation emission per window is easily enabled.

Fig. 2 shows a schematic partial cross-section of a second embodiment of a luminaire 1 according to the invention. The luminaire comprises a plurality of light sources 21, wherein each light source is an integrated package 23 of a respective UV-B die 25 and a respective RGB-die as a VIS-die 27. Each package is associated with a respective UV-VIS transmissive diffuser window 19 and reflector compartment 29 having diffusely reflecting walls 31. The plurality of compartments thus formed are arranged in a matrix arrangement. The packages are side emitting LEDs such that light from the RGB dies are thoroughly mixed before impinging on the diffuser window where the light of the RGB dies is further mixed and diffused. Radiation from the UV-die also impinges on the diffuse reflector and propagates through the diffuser window in well diffused form. The intensity of the individual UV-B dies is individually controlled, with the intensity of the UV-B die in the central region 9 being relatively low compared to the intensity of the UV-B die in the outer region 11. Visible light and UV-B radiation is issued as a cone a light from each compartment along a main axis 33 and with a cone top angle a of about 100°. It is noted that the UV radiation can have a different cone top angle than the visible light, for example because the reflector and the diffuser window could have different optical properties in the UV wavelengths and in the visible light wavelengths.

Fig. 3 A shows a schematic front view of a prior art lighting device, and Fig. 3B-D shows two embodiments of lighting devices 35 according to the invention. In the known, prior art lighting device the twelve UV-sources 5 are arranged in a 2*6 matrix with each cell 6 of said matrix being occupied by an UV-source. This configuration renders the prior art lighting device to have a too high peak irradiance of UV radiation at 20 cm distance from the exit window of the prior art lighting device. Figure 3B shows an architecture concept for a lighting device 35 according to the invention. Twelve UV-B sources 5 delivering the required UV-dose (between 0.01-0.7 SED/day at application distance) for VIT D production. However, the distribution of the UV-sources over the twelve cells 6 of the 2*6 matrix being rearranged in comparison with the prior art lighting device, i.e. more (as shown two) UV-sources are positioned per cell in the outer region, hence four extra UV-sources, while in the central region four cells which could accommodate an UV-source are empty.

This will lower the maximum irradiance over the whole luminaire at 20 cm and at the same time create a more uniform irradiance distribution in the far field at the desk level, i.e. about 1 m below the lighting device (related to the direction of gravity). This configuration renders the lighting device according to the invention to have a peak UV irradiance at 20 cm distance from the exit window fulfilling the photobiological safety requirements. Each cell is provided with a respective light source 17.

Figure 3C shows an architecture concept for a lighting device 35 according to the invention. Twenty-eight UV-B sources 5 arranged in a 3*12 cell matrix delivering the required UV-dose (between 0.01-0.7 SED/day at application distance) for Vitamin D production. This lighting device typically can be used for ceiling recessed luminaires which are arranged at higher locations above desk level, for example at about 2 meter above desk level. As shown the twenty-eight UV-sources are arranged such that a first occupancy degree of the cells 6 by UV-B-sources in a central region 9 is less than a second occupancy degree by UV-B-sources in an outer region 11 of said 2D matrix. As shown, in the central region six out of ten cells 6 are occupied by the UV-sources, i.e. a first occupancy degree of 60%, while in the outer region twenty-two out of twenty-six cells 6 are occupied, i.e. a second occupancy degree of 85%. Each cell is provided with a respective light source 17. Figure 3D shows an architecture concept for a lighting device 35 according to the invention. Ninety-six UV-B sources 5 arranged in a 8*12 cell matrix delivering the required UV-dose (between 0.01-0.7 SED/day at application distance) for Vitamin D production. This lighting device typically can be used for ceiling recessed luminaires which are arranged at higher locations above desk level, for example at about 3 meter above desk level. As shown, the UV-B sources are mutually arranged in an arrangement with a varying UV-source pitch wherein a central UV- source pitch Pc in a central region 9 is larger than a outer UV-source pitch Po in an outer region 11 of said arrangement. The light sources 17 have an identical arrangement to the arrangement of the UV-sources.

Fig. 4 shows a schematic view of a free floor standing luminaire 1 according to the invention positioned over a desk 37. The desk is approximately 1.2 m below the exit window of the luminaire. In the luminaire the lighting device of Figure 3B is accommodated, i.e. comprising twelve UV-B LEDs in the matrix arrangement as prescribed by the invention. The embodiment shown in Figure 4 is based upon a free floor standing. Similar principle of non-uniform UV-B LED placement on the board with a UV-B transparent diffuser (and optionally reflector) can also be applied in other luminaire architectures like recessed or suspended luminaires, different UV-B diffuser shapes and exit windows or even personal devices.

Fig. 5 shows a lighting system 100 according to the invention provided into an office room. The lighting system comprises a plurality of recessed luminaires 1 in a ceiling 51 where some of the conventional panels 53 that suspend from said ceiling are replaced by luminaires 1 according to the invention. Each of the luminaires comprises a plurality of UV- VIS transmissive windows 19. The presence of the luminaire according to the invention and the amount of UV-radiation emitted by the respective luminaire is adapted to the personal needs of a person working/sitting below a respective luminaire.

Fig. 6 shows the measured UV-B-irradiation distribution 61 at desk level on a horizontal plane of a desk 37 as obtained both by the prior art lamp and by the free standing luminaire 1 according to the invention as shown in Figure 4 positioned left to the desk, of which the exit window is located approximately 1.2 m above the desk level. Along the x-axis the width of the desk is given, i.e. being about 1.6 m, and on y-axis the depth of the desk is given, i.e. being about 0.8 m, desk borders 63, 65 are indicated. Typically a person will sit approximately at x = 0.8, y = 0. It appeared that both measured UV-B-irradiation distributions provided by the prior lamp respectively by the luminaire according to the invention are almost identical at desk level (or in the far field). The UV-irradiation distribution demonstrates that the irradiance is highest directly below the luminaire (with respect to the direction of gravity), i.e. at halfway the depth of the desk, i.e. y ~ 0.4, typically at a location where the hands of a person are when sitting and working at the desk. The irradiance is lower at the position where the persons main body (head) is located sitting in front of the desk, i.e. at y ~ 0, sometimes more to the left, sometimes more to the right, on average at the middle. The UV-B irradiance values have been measured with a handheld Wearshade sensor. The Photobiological Safety report shows that for this type of luminaire and setting the maximum allowed level for RGII, being 0.003 W/m2 at 20 cm distance, is exceeded by the prior art lamp, while said maximum allowed level for RGII is not exceeded by the luminaire according to the invention having the improved position arrangement of the UV-sources.

Claims

CLAIMS:

1. A lighting device providing simultaneously illumination and UV-treatment comprising a plurality of LED light sources and a plurality of LED UV-sources, wherein:

- the UV-sources are mutually arranged in an arrangement with a varying UV- source pitch wherein the UV-source pitch in a central region is larger than the UV-source pitch in an outer region of said arrangement, or

- the UV sources are arranged in cells of constant cell size of a 2D matrix, wherein a first occupancy degree of the cells in a central region is less than a second occupancy degree in an outer region of said 2D matrix,

wherein during operation the light sources issue visible light with a brightness that counteracts humans of looking directly into the light sources and UV-sources.

2. The lighting device as claimed in claim 1, wherein the 2D-matrix of matrix cells is built-up by the arrangement of the light sources.

3. The lighting device as claimed in claim 1 or 2, wherein the plurality of light sources being distributed over said matrix cells with a pitch having a spreading in light source pitch smaller than a spreading in UV-source pitch.

4. The lighting device as claimed in claim 1, 2 or 3, wherein the plurality of lght sources is distributed over the cells of the 2D-arrangement such that essentially each matrix cell of the 2D-arrangement is provided with a single light source and 50%-90% of the matrix cells are each provided with a single UV-source with matrix cells not occupied by UV- sources being in the central region.

5. The lighting device as claimed in any one of claim 1 to 4, wherein essentially each matrix cell of the 2D-arrangement is provided with a single light source and a UV- source wherein 10%-50% of the matrix cells in the outer region are each provided with an additional UV-source.

6. A lighting device providing simultaneously illumination and UV-treatment comprising a plurality of light sources, the arrangement of the light sources built-up a 2D- matrix of matrix cells, said 2D-matrix comprises an outer region and a central region,

wherein the light sources are LEDs and each LED comprises a package of an UV die and a VIS die, wherein at least one UV-die in the central region is driven at a lower power than the UV-die in the outer region,

wherein during operation the light sources issue visible light with a brightness that counteracts humans of looking directly into the light sources.

7. The lighting device as claimed in claim 6, wherein the LEDs are chosen from, W-UV-LEDs, RGB-UV-LEDs, RGBW-UV-LEDs, RGBWA-UV LEDs.

8. The lighting device as claimed in any one of claim 1 to 7, wherein during operation the light sources issue light having a luminance of at least a level at which according to the Unified Glare Rating, glare is observed by observers.

9. The lighting device as claimed in any one of claim 1 to 8, wherein the UV- sources emit a diffuse beam with a FWHM beam angle of at least 60°, preferably a

Lambertian emitter.

10. The lighting device as claimed in any one of claim 1 to 9, wherein the UV- sources are UV-B- sources.

11. A luminaire comprising a lighting device as claimed in any one of claim 1 to 10, wherein the light sources and UV-sources are mounted, preferably on a board, in a housing and covered with a cover, and wherein the cover comprises an opaque portion with a plurality of UV-VIS transmissive windows arranged in a 2D-arrangement, said 2D arrangement matching and being aligned with the 2D matrix of the light sources.

12. The luminaire as claimed in claim 11 with a lighting device as claimed in any one of the preceding claims 1 to 6, wherein the light sources are arranged on opaque cover portions and face towards the UV-sources.

13. The luminaire as claimed in claim 12, wherein each window forms an exit window of a single associated reflector compartment comprising a respective associated matrix cell.

14. A lighting system comprising at least two luminaires as claimed in any one of the claims 11, 12 or 13 and at least one user interface selected from on/off button, remote control, mobile device.

15. Use of the lighting device as claimed in any one of the claims 1 to 10 and/or luminaire as claimed in any one of the claims 11, 12 or 13 or lighting system as claimed in claim 14 for managing of vitamin D in humans.