DE102016203862A1 - Luminaire and method for illuminating a predetermined area - Google Patents

Abstract

The present invention relates to a luminaire (1) for illuminating a predetermined surface (10) with a light source assembly (11) formed by at least a first light source (12) and a second light source (14) adapted to emit light emitting a first region (10a) of the predetermined surface (10), wherein the first light source (12) is adapted to emit light of at least one color different from the color of the light of the second light source (14). The luminaire (1) furthermore has a control device (60) which is designed to set parameters of at least one of the light sources (12, 14, 20).

Description

The present invention relates to a luminaire and a method for illuminating a predetermined area.

Luminaires for illuminating predetermined areas are known in various embodiments and variants. Lights of conventional design include a light source, a so-called light source, which is arranged in the interior of a substantially cup-shaped reflector. Starting from the light source, in the luminaires of the prior art, light components are emitted directly from the luminous means to the predetermined surface and indirect light components are directed onto the predetermined surface only after reflection at portions of an inner side of the reflector element.

The EP 2 184 533 A1 discloses a luminaire for illuminating building surfaces, comprising a shell-shaped reflector element, in whose interior a light source is arranged. The inner surface of the reflector element has a first portion and a second portion, wherein light, which comes from the light source coming on the first portion, is directed predominantly from the first portion to the building surface, and wherein a substantial portion of the light, which Coming from the light source strikes the second section, only hits the building surface due to a further reflection on the first section. The principle consists essentially in the fact that the reflective inner surface of the reflector element is divided into different, spaced-apart sections with different reflective properties.

The publication WO 2011/092625 A1 discloses a method of controlling a color-changeable light source which can vary a saturation component of the emitted light of the light source depending on a set color temperature of the light source and the color of an illuminated object.

The publication DE 10 2009 044 063 B3 discloses an arrangement for avoiding damage to radiation-sensitive exhibits in museums, in which sensor arrangements determine the illuminance on the exhibit and regulate a luminaire for illuminating the exhibits in accordance with the measured illuminance.

The publication EP 2 257 728 A2 discloses a light source of various LEDs of variable color and color temperature, in which the chromaticity of the individual LEDs are adjusted in dependence on a reference chromaticity.

Against this background, it is an object of the present invention to provide an improved luminaire and an improved method for illuminating a predetermined area.

This object is achieved by a lamp with the features of claim 1 and by a method having the features of claim 13.

The invention accordingly provides a luminaire for illuminating a predetermined area, comprising a light source arrangement formed by at least a first light source and a second light source, which are adapted to emit light onto a first area of the predetermined area, the first light source is designed to emit light of at least one color, which is different from the color of the light of the second light source.

By virtue of the fact that the first light source emits light with a color differing from the second light source, the colors of the light emitted by the first light source are mixed with the light emitted by the second light source.

The luminaire also has a control device which is designed to set parameters of at least one of the light sources. In particular, the control device is adapted to vary the light component of the first light source and the light component of the second light source on the light which can be emitted by the light source arrangement by controlling the brightness of the light emitted by the first light source and the second light source.

In this way, by controlling the brightness of the individual light sources, in particular individual luminous elements of the light sources, their respective light component and thus their color component can be controlled at the total light that can be emitted by the light source arrangement. As a result, in particular the parameters color temperature and color saturation of the emitter light can be set. In particular, the adjustability of the color saturation has the advantage that certain color components of an object to be illuminated emerge stronger or weaker. This is particularly advantageous in the illumination of art objects, as their intended optical effect can be influenced in this way advantageous.

• (a) den ersten Bereich, (b) einen zweiten Bereich, wobei der erste Bereich und der zweite Bereich der vorbestimmten Fläche entsprechen.

Optionally, it can be provided that the light source arrangement is additionally formed by a third light source, which is adapted to light one of the color of the light of the first light source and the second light source different color to at least one of the following areas of the predetermined area to emit:

• (a) the first area, (b) a second area, wherein the first area and the second area correspond to the predetermined area.

In particular, the first and the second region may overlap, in particular the second region may be a partial region of the first region and, for example, be completely within the first region or be congruent thereto. Alternatively, the first area and the second area may be disjoint.

The predetermined area may in principle extend in any way. Preferably, the predetermined area is a rectangular area or may be a circular, elliptical, trapezoidal, triangular, polygonal or similar bounded area.

In this case, the control device may in particular be designed to vary the light component of the third light source at the light which can be emitted by the light source arrangement by controlling the brightness of the light emitted by the third light source.

According to a possible embodiment it is provided that one of the light sources is surrounded concentrically by at least one further light source, wherein in particular the first light source and / or the second light source are arranged in an inner region of the luminaire, and the optionally provided third light source in an outer region the light is arranged concentrically surrounding the first and / or second light source.

As used herein, the terms "inboard" or "inboard" are generally understood to refer to a radial direction of the luminaire.

In particular, it can be provided that the first, second and the optional third light source are each arranged concentrically to each other, wherein the first light source in an inner region of the lamp, the second light source concentrically surrounding the first light source and the third light source in an outer region of the lamp , the second light source are arranged concentrically surrounding. In general, an annular arrangement of the light sources can be provided.

A concentric arrangement can be realized, for example, in that the second light source is designed as an LED module, in particular as a chip-on-board LED module, COB-LED module for short, in which a number, that is one or more, of LED elements are arranged on a carrier substrate and are covered with a phosphor layer. In this case, the LED module may be round in a plan view and have in its center an area without LED elements and without phosphor. In this area, the first light source can be arranged. For this purpose, the region may be formed as an opening in the carrier substrate. The first light source thus sits in the opening and is not coupled to the carrier substrate. However, the region can also be provided on the carrier substrate and have electrical contact elements for the connection of the first light source. The first light source is thus located in the center of the carrier substrate and sits on this. The first light source can also be designed as a COB-LED module. The third light source may also be arranged as an annular light source in a separate region of the carrier substrate concentrically around the second light source. In particular, the third light source can also be designed as a COB LED module.

Furthermore, it can be provided that the first light source has a plurality of light elements, wherein the light that can be emitted by the respective light elements has different colors. By way of example, the first light source can be formed by at least one first and at least one second light element, wherein the at least one first light element is suitable for emitting light with a color that differs from the color of the light which can be emitted by the at least one second light element. In particular, the control device can also be designed to independently control or adjust the brightness of the first and second light-emitting elements of the first light source.

According to a further embodiment, the luminaire can have a matrix of luminous elements, and wherein the first, second and the optional third light source each have subsets of the luminous elements. This results in a flexible and easy-to-implement arrangement of luminous elements whose assignment to different light sources is easy to adapt to the particular application.

According to an alternative embodiment, at least one of the light sources may comprise one or more flip-chip LEDs.

According to a further possible embodiment it is provided that between the second and third light source, a spacer element for spacing the second and third light source from each other is arranged. Thus, it can be achieved that, depending on the emission angle of the light sources, the second light source illuminates the first region of the predetermined surface and the third one Light source illuminates the second area of the predetermined area.

As already explained, a control device is provided, which is designed to set parameters of the first and second light source. With the control device, which can be integrated in the luminaire, it is possible in a simple manner to vary the lighting properties of the luminaire and in particular of the different light sources or of the individual luminous elements of the light sources. The control device can be remotely controlled, for example via wireless communication technology such as WLAN, WiFi, Bluetooth ^®, infrared or similar means of communication. In addition, autonomous or automatic adaptation of the lighting properties of the luminaire by the control device can be carried out via corresponding sensors and monitoring devices.

According to a further possible embodiment, it is further provided that the color temperature of the light which can be emitted by the light source arrangement can be varied by varying a light component of the first light source and a light component of the second light source at the light which can be emitted onto the first region of the predetermined surface by means of the control apparatus. For example, the color temperature of the light that can be emitted to the first area of the predetermined area, e.g. is emitted from the first and second light sources of the light source array, irrespective of the color temperature of the light which can be emitted to a second area of the predetermined area, e.g. is emitted from the optional third light source of the light source array. Thus, the color temperature of the light which can be emitted to the first area of the predetermined area can be varied from the color temperature of the first light source to the color temperature of the second light source. In general, the light temperature of the light emitted by the light source arrangement can be adjusted by means of the control device by varying the light proportions of the individual light sources.

Keeping the color temperature constant when the saturation of the light changes allows, in a particularly advantageous manner, the change in the illumination properties, without the color temperature and therefore the irradiance in the first area having to be changed. This can be of particular advantage when illuminating radiation-sensitive objects such as art exhibits.

As already explained above, the light component of the first light source and the light component of the second light source can be varied at the light which can be emitted by the light source arrangement by controlling the brightness of the light emitted by the first light source and the second light source by means of the control device. For example, the light component of the first light source and the light component of the second light source can be variable at the light which can be emitted to the first region of the predetermined surface by controlling the brightness of the light emitted by the first light source and the second light source by means of the control device. Thus, the light component of the first light source and the light component of the second light source can be varied steplessly on the light which can be emitted onto the first region of the predetermined surface.

In this case, it can be provided, in particular, that the red and blue components of the light which can be emitted by the first and the second light source can be controlled. Advantageously, the first light source can be formed by at least one light-emitting element, for example an LED, which emits red light, for example, and which illuminates the second light source by at least one further light-emitting element, e.g. be formed an LED, for example, emits blue light. The brightness of the light which can be emitted by the individual light sources can then be adjusted by means of the control device in such a way that a certain color saturation of the light which can be emitted by the light source arrangement as a whole results.

It can also be provided that, for example, the first light source has a plurality of light elements, e.g. in the form of LEDs adapted to emit white light and the second light source is formed by a plurality of lighting elements, at least one of which is adapted to emit blue light and at least one is adapted to emit red light. Here and generally it can be provided that the individual light elements of the respective light source and thus this total in their brightness is controllable. In particular, the color saturation of the light which can be emitted by the light source arrangement can thus be controlled.

The change in color saturation causes a change in the color rendering index (CRI) of the light source array. Thus, certain color components can be advantageously emphasized on an object to be illuminated by means of the luminaire according to the invention.

Furthermore, the control device may generally be configured to set the saturation of the light which can be emitted by the light source arrangement at a substantially constant color temperature by driving the first light source and the second light source. In this case, it may also be provided, for example, that in particular the saturation of the light which can be emitted onto the first region of the predetermined surface at a substantially constant color temperature by driving the first Light source and the second light source is adjustable by means of a control device.

According to a further possible embodiment, it is provided that a light distribution of the light which can be emitted onto the first and second regions of the predetermined surface is controlled by controlling the brightness of the light emitted by the first, second and / or the optional third light source, in particular by controlling the brightness of the light emitted by the first light source and / or the second light source emitted light in relation to the light emitted from the third light source, by means of the control device is variable. As a result, the light distribution of the light emitted onto the first region of the predetermined surface and of the light emitted onto the second region of the predetermined surface can be adjusted in relation to one another or adapted to the desired illumination requirements.

According to a further embodiment, it is further provided that the luminaire has a lens arrangement, which is arranged displaceable relative to the light source arrangement. In particular, the lens arrangement can be displaceable along a lamp longitudinal axis.

In particular, the lens arrangement may be positionable relative to the light source arrangement such that an emission angle of the respective light emitted by the corresponding light source of the luminaire is variable. Depending on the position of the lens arrangement relative to the first, second and third light source of the luminaire, the emission angle of the light emitted by the luminaire can thus be adjusted.

In general, the lens arrangement can also be positioned such that the lens arrangement mixes the light components respectively emitted by the different illuminants of the illuminant arrangement as a function of the distance between the lens arrangement and the illuminant arrangement. In particular, a positioning of the lens arrangement can take place such that the first area of the predetermined area is irradiated with light which has a substantially homogeneous color temperature and / or saturation over the first area. Thus, due to the fact that the lens arrangement is arranged displaceably relative to the illuminant arrangement, the characteristic of the light emitted by the luminaire, in particular with regard to saturation, color temperature and the light components of the illuminants, can be varied in a simple and efficient manner.

The lens arrangement may comprise at least one lens. For example, the lens assembly may comprise a single lens or a plurality of lenses spaced along the length of the lamp. The at least one lens is preferably formed from a glass material, a plastic material, in particular a plastic material based on polycarbonate, polyamide or polymethyl methacrylate or a silicone material.

Furthermore, it can be provided that the luminaire additionally or alternatively to the lens arrangement has a reflector arrangement extending along a longitudinal axis of the luminaire. By means of the reflector arrangement, in particular light losses can be avoided and the radiation emitted by the light source arrangement can be bundled onto the optionally present lens arrangement.

According to a further possible embodiment, the luminaire may have a shutter arrangement arranged with respect to a luminaire longitudinal axis below the light source arrangement.

According to a further possible embodiment, it is further provided that the first light source, the second light source and / or the third light source are formed by a plurality of light-emitting elements, in particular a plurality of LED elements. The provision of LED elements has the advantage of a reduced power consumption compared to conventional light-emitting elements and the availability of a multiplicity of different LED elements which emit light of different color temperatures. Furthermore, LED elements are dimmable, as a result of which the brightness is infinitely variable, and when a plurality of LED elements of different color temperatures are provided, the color temperature of the light emitted by the different LED elements is likewise adjustable.

According to a further possible embodiment, it is provided that the third light source has at least two different color temperatures emitting light elements, wherein the color temperature of the light emitted to the second region of the predetermined surface light by varying a proportion of light of the at least two different light elements of the third light source on the second Area of the predetermined surface of the light emitted by the control device is variable.

According to a further possible embodiment, the luminaire may have a sensor arrangement which is designed to determine a color temperature of the radiation emitted by the first area of the predetermined area, wherein the control apparatus may be further configured to adjust the color temperature and / or the saturation of the color temperature of the first light source and / or the second light source of emitted light as a function of the color temperature determined by the sensor arrangement that of the first region of the set radiation emitted predetermined surface. This allows an automatic and self-regulating adjustment of the lighting properties of the lamp, which may be advantageous, for example, in the illumination of objects such as Kunstexponaten, which have a high sensitivity to radiation, for example, in changing light conditions during the day or in varying climatic conditions in the vicinity of the object. With this measure, a lighting can be realized, which ensures the best possible illumination of the object, without critical irradiance or irradiation temperatures are exceeded.

The invention further provides a method for illuminating a predetermined area. The method includes emitting light to a first area of the predetermined area from a first light source of a light source array and a second light source of the light source array, wherein the first light source emits light of at least one color different from the color of the light of the second light source. Here, the light component of the first light source and the light component of the second light source are varied at the light emitted to the first region of the predetermined surface by controlling the brightness of the light emitted by the first light source and the second light source.

Optionally, the method may further comprise emitting light from a third light source of the light source assembly onto at least one of the predetermined areas of the predetermined area: (a) the first area, (b) a second area, the first area and the second area of the first area correspond to predetermined area. In particular, the first area and the second area may be identical or different from each other or may partially overlap. The proportion of light of the third light source at the first and / or second area of the predetermined area emitted to the first area is varied by controlling the brightness of the light emitted from the third light source.

Preferably, in the method, it is further provided that a color temperature of the light emitted onto the first region of the predetermined surface by varying a light component of the first light source and / or the second light source at the light emitted to the first region of the predetermined surface, for example by means of an above described control device is varied. Thus, the color temperature of the light which can be emitted to the first area of the predetermined area can be varied from the color temperature of the first light source to the color temperature of the second light source.

According to a further preferred embodiment of the method, it is provided that the light component of the first light source and the light component of the second light source at the light emitted to the first region of the predetermined surface by controlling the brightness of the emitted light from the first light source and the second light source by means of Control device is varied. Thus, the light component of the first light source and the light component of the second light source can be varied steplessly at the light which can be emitted onto the first region of the predetermined surface.

Furthermore, a positioning of a lens arrangement relative to the light source arrangement may take place in such a way that the first area of the predetermined area is irradiated with light which has a substantially homogeneous color temperature and / or saturation over the first area. Consequently, the mixing of the light can be varied with the lens arrangement.

Alternatively or in addition to this, the lens arrangement can be positioned relative to the light source arrangement in such a way that an emission angle of the respective light emitted by the corresponding light source of the light source arrangement of the luminaire is varied. Depending on the position of the lens arrangement relative to the light source arrangement of the luminaire, the emission angle of the light emitted by the luminaire can be adjusted.

Preferably, in the method, it is provided that a light distribution of the light emitted to the first and second regions of the predetermined surface by controlling the brightness of the emitted light from the first, second and / or third light source, in particular by controlling the brightness of the first light source and / or the second light source emitted light in relation to the light emitted from the third light source, eg is varied by means of a control device described above. As a result, the light distribution of the light emitted onto the first region of the predetermined surface and of the light emitted onto the second region of the predetermined surface can be adjusted in relation to one another or adapted to the desired illumination requirements.

According to a possible embodiment variant of the method, the saturation of the light emitted on the first area of the predetermined area at substantially constant color temperature can be further adjusted by driving the first light source and the second light source. This makes it possible in a particularly advantageous manner, the change in the lighting properties, without the color temperature and thus the irradiance in the first area must be changed, which in the illumination of radiation-sensitive objects such Kunstexponaten can be of particular advantage.

According to a further preferred embodiment of the method, provision may be made for a color temperature of the light emitted onto the second region of the predetermined surface to be varied by varying a light component of the at least two different luminous elements of the third light source at the light emitted onto the second region of the predetermined surface, eg by means of a control device described above. Thus, by providing at least two different luminous elements, the color temperature of the light which can be emitted to the second region of the predetermined surface can be adjusted according to the illumination requirements.

According to an exemplary embodiment of the method, the steps of determining a color temperature of the radiation emitted by the first region of the predetermined surface, and adjusting the color temperature and / or the saturation of the light emitted by the first light source and / or the second light source can be further dependent on the determined color temperature of the radiation emitted by the first region of the predetermined surface are made. This allows an automatic and self-regulating adjustment of the lighting properties of the lamp, which may be advantageous, for example, in the illumination of objects such as Kunstexponaten, which have a high sensitivity to radiation, for example, in changing light conditions during the day or in varying climatic conditions in the vicinity of the object. With this measure, a lighting can be realized, which ensures the best possible illumination of the object, without critical irradiance or irradiation temperatures are exceeded.

Embodiments of the invention are illustrated in the figures of the drawing and explained in more detail in the following description.

It illustrate:

1A a schematic representation of a lamp for illuminating a predetermined area according to an embodiment of the present invention;

1B a view of an embodiment of a luminaire of the present invention according to the 1A , with a to 1A alternative light source structure;

1C a view of an embodiment of a luminaire of the present invention according to the 1A , with a to 1A another alternative light source structure;

1D a view of an embodiment of a luminaire of the present invention according to the 1A , with a to 1A another alternative light source structure;

1E a view of an embodiment of a luminaire of the present invention according to the 1A , with a to 1A another alternative light source structure;

2 a schematic representation of the lamp for illuminating a predetermined area according to another embodiment of the present invention;

3 a schematic representation of the lamp for illuminating a predetermined area according to another embodiment of the present invention;

4 a sectional view of an embodiment of a lamp according to the present invention;

5A a sectional view of another embodiment of a lamp according to the present invention;

5B another sectional view of in 5A shown embodiment, in which a lens assembly is arranged in a relation to a lamp longitudinal axis upper position;

5C another sectional view of in 5A shown embodiment in which the lens assembly is disposed in a position with respect to the lamp longitudinal axis lower position;

6A a sectional view of another embodiment of a lamp according to the present invention;

6B a perspective view of the in 6A shown embodiment of a lamp according to the present invention;

7 a support for holding a lens assembly of a lamp according to an embodiment of the invention;

8th a collar for moving a lens assembly of a lamp according to an embodiment of the invention.

1A shows a schematic representation of an exemplary luminaire for illuminating a predetermined area according to a preferred embodiment of the present invention. The lamp 1 has a light source arrangement 11 in particular by a first light source 12 and a second light source 14 is formed. Optionally, in addition, a third light source 20 be provided, preferably by a spacer element 15 from the first and second light sources 12 . 14 spaced apart. The first, second and third light source 12 . 14 . 20 can, as in 1A is shown, each concentric with each other, wherein the first light source 12 in an inner region with respect to a radial direction R. 13 , For example, circular, the second light source 14 for example, circular in one to the inner area 13 in the radial direction R adjacent area 17 concentric with the inner area 13 and the third light source 20 for example, also circular in an outer area 21 the light 1 also concentric around the areas 13 and 17 are arranged. The spacer element 15 is preferably between the second and third light source 14 . 20 arranged and is particularly adapted to the second and third light source 14 . 20 spatially spaced from each other.

The first light source 12 preferably has a plurality of luminous elements 12a on which in the inner area 13 are arranged. The lighting elements 12a are preferably designed as LED elements that can emit light of the same or similar color or color temperature or light with different colors or color temperatures. The second light source 14 has a plurality of lighting elements 14a in which to the inner area 13 adjacent area 17 are arranged.

1B shows by way of example a further possible concentric construction of the light source arrangement 11 in which the first light source 12 for example, two light elements 12a . 12b having, wherein the luminous element 12a is suitable to emit blue light and the luminous element 12b is suitable to emit red light. Generally, the lighting elements 12a . 12b suitable to emit light of different colors. The second light source 14 is made of a variety of lighting elements 14a which are each suitable for emitting white light, for example with a light temperature in the range between preferably 3000 Kelvin and 4000 Kelvin, particularly preferably 3500 Kelvin. Generally, the first and second light sources are 12 . 14 designed such that the first light source 12 is suitable to light one of the color or color temperature of the light of the second light source 14 to emit distinctive color or color temperature. For example, each of the first and second light sources may also be suitable for emitting green, yellow, blue or red light. With a control device 60 , in the 1A is shown schematically, for example, the brightness of each of the in 1B shown lighting elements 12a . 12b . 14a be set. In this way, the color saturation of the bulb assembly 11 emissable light advantageously adjustable.

1C shows a shows an example of another possible structure of the light source arrangement 11 in which the lighting elements 12a the first light source 12 and the lighting elements 14a the second light source 14 preferably evenly across the surface of the light source assembly 11 are distributed. The first light source 12 is made of a variety of lighting elements 12a which are each suitable for emitting light having a light temperature in the range between preferably 3500 Kelvin and 4500 Kelvin, particularly preferably 4000 Kelvin. In particular, it can be provided that the different lighting elements 12a Can emit light of different color temperatures. The second light source 14 is made of a variety of lighting elements 14a which are each suitable for emitting light with a light temperature in the range between preferably 2500 Kelvin and 3500 Kelvin, particularly preferably 3000 Kelvin. Due to the uniform distribution, a particularly good mixing of the light is made possible. Generally, the first and second light sources are 12 . 14 designed such that the first light source 12 is suitable to light one of the color or color temperature of the light of the second light source 14 to emit distinctive color or color temperature. Again, for example, the first and the second light source may also be suitable, for example, to emit green, yellow, blue or red light.

1D shows by way of example a further possible concentric construction of the light source arrangement 11 in which the first light source 12 flat as a chip-on-board, short COB, LED module is formed. The second light source 14 is also flat as a COB LED module and concentrically surrounds the first light source 12 , In this case, the first and the second light source 12 . 14 designed such that the first light source 12 is adapted to light one of the color temperature of the light of the second light source 14 to emit distinctive color temperature.

1E shows by way of example a further possible concentric construction of the light source arrangement 11 in which the first light source 12 flat as a COB LED module is formed and a first light element area 12a1 suitable for emitting, for example, blue light and a second light-emitting element region 12a2 suitable for emitting, for example, red light. Generally, the first light-emitting element region is 12a1 suitable to emit light of a color or color temperature that differs from the color or color Color temperature of the second light-emitting element region 12a2 differs light emitted. The second light source 14 is also flat as a COB LED module and concentrically surrounds the first light source 12 , In this case, the first and the second light source 12 . 14 designed such that the first light source 12 is adapted to light one of the color temperature of the light of the second light source 14 to emit distinctive color temperature. For example, the second light source 14 be suitable to emit light with a color temperature in the range between 2500 Kelvin and 4500 Kelvin.

Notwithstanding the in 1A illustrated circular light source structure of the light source assembly 11 It may also be possible to have a matrix or an array of luminous elements 12a . 14a . 20a and 20b then build up the different light sources 12 . 14 respectively. 20 can be assigned. This allows a particularly flexible construction of a lamp 1 can be achieved since with the same basic structure with different assignment to the light sources 12 . 14 . 20 Luminaires of different lighting properties can be implemented. For example, a grid-shaped matrix of luminous elements can be selected, wherein luminous elements 12a an inner rectangular area of the first light source 12 can be assigned. A rectangular frame of luminous elements 14a , which is arranged around the inner rectangular area around, the second light source 13 be assigned. Finally, one around the lighting elements 14a surrounding rectangular frame of light elements 20a . 20b the third light source 20 form.

Alternative constructions and topologies of light sources 12 . 14 and 20 as well as their structure of light points or light elements 12a . 14a . 20a . 20b as "pixels" of the light sources with various other geometric basic structures are also conceivable.

The lighting elements 12a . 14a . 20a . 20b are preferably designed as LED elements with the same or similar color temperature. The third light source 20 has, for example, a plurality of luminous elements 20a . 20b different color or color temperature. The lighting elements 20a according to an embodiment of the present invention, a first color temperature and the lighting elements 20b one, different from the color temperature of the lighting elements 20a distinctive second color temperature. The lighting elements 20a . 20b are preferably designed as LED elements. Alternatively, the lighting elements 20a . 20b be formed by another suitable light source. This also generally applies to all other lighting elements of the remaining light sources.

The luminaire according to the invention also has a control device 60 on, like in 1A is shown by way of example and purely schematically. The control device 60 is designed to parameter at least one of the light sources 12 . 14 . 20 adjust. In particular, the control device 60 designed to be the light component of the first light source 12 and the light portion of the second light source 14 at the of the light source assembly 11 emissive light by controlling the brightness of the first light source 12 and the second light source 14 emitted light to vary. For example, it can be provided that the control device 60 the brightness of the lighting elements 12a . 12b . 14a . 20a . 20b respectively. 12b2 . 12a1 in the 1A to 1E shown embodiments set independently.

2 shows a schematic representation of the lamp for illuminating a predetermined area according to another preferred embodiment of the present invention. The lamp 1 is in 2 shown in a cross-sectional view. The first, second and third light source 12 . 14 . 20 the light 1 are in a respect to a lamp longitudinal axis L upper portion of the lamp 1 arranged and emit light downwards.

As in 2 shown schematically, the light can 1 furthermore, a lens arrangement 16 exhibit. The lens arrangement 16 is with respect to the lamp longitudinal axis L below the light sources 12 . 14 . 20 arranged.

For example, the lens arrangement 16 , as in 2 is shown in a lower area of the luminaire 1 arranged and from a side wall 3 a housing 2 the light 1 be surrounded in the circumferential direction. It can also be provided that the lens arrangement 16 , as in 5A is shown in an upper area of the luminaire 1 , For example, with respect to the lamp longitudinal axis L immediately below the light source arrangement 11 is arranged. As in 6A shown, the lens assembly 16 also have a plurality of lens devices. At the in 6A shown embodiment of the lamp 1 are, for example, a top lens device with respect to the lamp longitudinal axis L. 16a and a lower lens device 16b intended.

The lens arrangement 16 can in particular relative to the light source arrangement 11 displaceable, in particular along lamp longitudinal axis L slidably disposed, as in 2 indicated by arrow P.

To realize the displaceable arrangement of the lens arrangement 16 can the light 1 preferably one (in 2 not shown) positioning 30 for positioning the lens assembly 16 exhibit. This allows positioning of the lens assembly 16 relative to the light source assembly 11 ,

The positioning mechanism 30 has a carrier 31 at which the lens assembly 16 is fixed, and a guide section 32 on, the carrier 31 at the guide section 32 is slidably guided along the lamp longitudinal axis L. The guide section 32 is through a relative to the light source assembly 11 stationary component formed. In the in the 5A . 5B and 5C shown embodiment of a lamp 1 is the lead section 32 for example, by an inner surface 32a the side wall 3 of the housing 2 educated. At the in 6A shown embodiment of a lamp 1 is the lead section 32 through a lower section 32b the side wall 3 of the housing 2 educated. In this embodiment, it can be provided that either the lower or the upper lens device 16a . 16b are formed displaceable. Alternatively, both the upper and the lower lens device can 16a . 16b be formed displaceable.

The carrier 31 can, as in the 5A . 5B . 5C and 7 shown as a double cylinder with respect to the radial direction R inner cylinder 37 and an outer cylinder with respect to the radial direction R. 38 be formed, wherein the outer cylinder 38 in the radial direction R to the inner cylinder 37 spaced and with this, for example via connecting ribs 39 connected is. The inner cylinder 31 encloses the lens arrangement 16 in the circumferential direction and holds them. On an inner circumferential surface 31b of the carrier 33 passing through an inner surface of the inner cylinder 31 may be formed, a coating of a reflective material is preferably provided.

The carrier 31 can also, as in 6A is shown to be implemented as a substantially cylindrical member which is on the inner circumferential surface 31b Support ribs T for holding the lens assembly 16 or the lower lens device 16b having.

The positioning mechanism further comprises an actuator 33 on. This can, as in the 5A . 6 and 8th is shown as one of two half-shells 34 composite actuating ring to be formed on the outside of the housing 2 is arranged and surrounds it in the circumferential direction at least partially. The actuating device 33 indicates a surface lying in relation to the radial direction R. 33a an operating section 35 on, like in 8th shown as one from the surface 33a protruding extension may be formed. Alternatively, the operating portion 35 also be formed as a recess. At the actuator 33 is on an outer surface 33b at which a user controls the actuator 33 engages, preferably provided with a cover or coating of a haptic-responsive material with low thermal conductivity, such as a rubber or plastic material.

The carrier 31 that the lens arrangement 16 holds at an outer circumferential surface with respect to the radial direction 31a also an operating section 36 on. The outer peripheral surface 31a For example, by an outer peripheral surface of the outer cylinder 38 be educated. This one can, as in 7 is shown, as formed at least partially in the lamp longitudinal direction L recess. Alternatively, the operating portion 36 of the carrier 31 also as one of the surface 31a protruding extension be formed, which may in particular at least partially extend in the lamp longitudinal direction L.

The operating section 35 the actuator 33 and the operation section 36 of the carrier 31 interlock By turning the actuator 33 a directed along the lamp longitudinal axis L force acts on the carrier 31 , causing the lens assembly 16 relative to the light source assembly 11 is moved.

In the in the 5A . 5B and 5C shown embodiment of the lamp 1 is the lens arrangement 16 relative to the illuminant order 11 by means of the positioning mechanism 30 in particular slidable along the lamp longitudinal axis L. At the in 6A shown embodiment of the lamp 1 is the lower lens device 16b relative to the light source assembly 11 by means of the positioning mechanism 30 in particular slidable along the lamp longitudinal axis L.

5B shows an example of a positioning of the lens assembly 16 in an upper section of the housing 2 the light 1 with a small distance between the light source arrangement with respect to the longitudinal axis L of the lamp 11 and the lens assembly 16 , 5C shows an example of a positioning of the lens assembly 16 in a middle section of the housing 2 the light 1 with a long distance between the light source arrangement with respect to the lamp longitudinal axis L. 11 and the lens assembly 16 ,

In general, the lens arrangement 16 be positioned so that a distance of the lens assembly 16 in the vertical direction of the lamp 1 relative to the first, second and third light sources 12 . 14 . 20 is variable. This allows a beam angle α of the lamp 1 emitted light can be varied. The beam angle α is in this case in particular as a beam angle of the lamp 1 at a light exit opening 4 to understand. The beam angle α of the lamp 1 emitted light may in this case preferably in a range of 10 ° to 90 °, in particular preferably in a range of 10 ° to 60 °, are varied.

The lens arrangement 16 In general, it can also be positioned such that the lens arrangement 16 those of the different bulbs 12 . 14 . 20 the lighting arrangement 11 each emitted light components depending on the distance between the lens assembly 16 and lighting arrangement 11 mixed. This may be due to the fact that the lens assembly 16 opposite the lamp arrangement 11 slidably arranged, in a simple and efficient way, the characteristics of the lamp 1 emitted light, in particular with regard to saturation, color temperature and the light components of the lamps 12 . 14 . 20 be varied.

3 shows a schematic representation of the lamp for illuminating a predetermined area according to another preferred embodiment of the present invention. In 3 is also an illumination of a predetermined area 10 through the light 1 shown. According to the presentation of the 3 is the predetermined area 10 a rectangular area. The predetermined area 10 however, it may also be an area that is circular, elliptical, trapezoidal, triangular, polygonal or similar, for example. The predetermined area 10 has, for example, a first area 10a and a second area 10b on. The first area 10a is inside the predetermined area 10 , in particular in a central region of the predetermined area 10 arranged. The second area 10b is through the remaining area of the predetermined area 10 which is not formed by the first area 10a is covered. This can be the first area 10a and the second area 10b be disjoint, as exemplified in 3 is shown. Alternatively, the first and second areas may be 10a . 10b also overlap, in particular, the second area 10b a subarea of the first area 10a and, for example, completely within the first range 10a lie or be congruent to this.

For example only, the predetermined area 10 shown as rectangular. It may differ from the illustration in 3 also be provided, the predetermined area 10 to choose as a circular, oval, trapezoidal or otherwise designed surface. The area to be illuminated 10 can thereby taking into account the surface effect of the lens arrangement 16 in the 2 . 5 and 6 to get voted. For example, the size of each of the first and second areas 10a . 10b depending on the distance between lens array 16 and light source arrangement 11 be adjustable with respect to the lamp's longitudinal axis L. The dependence can for example be designed such that a large distance along the lamp longitudinal axis L between the lens arrangement 16 and light source arrangement 11 (see eg 5B ) causes the first area 10a has a small amount of surface area and a small distance along the lamp longitudinal axis L between the lens assembly 16 and light source arrangement 11 (see eg 5C ) causes the first area 10a has a large amount of surface area.

According to a preferred embodiment, the luminaire according to the invention 1 For example, be used for the illumination of art objects in a gallery. The first area 10a the predetermined area 10 can be formed for example by an art object such as a picture or painting. The second area 10b the predetermined area 10 is in this case, for example, a wall surface on which the art object is arranged. Thus, a separate illumination of the art object and the wall surface on which the art object is arranged, be made. The color temperature of the light sources 12 . 14 generated light for illuminating the art object can be varied by means of a suitable control device. The control device may, for example, by the control device 60 be realized. This may include functions for controlling the lens arrangement 16 exhibit. For example, it can be provided that the mechanism 30 for adjusting the lens arrangement 16 , in particular the actuating device 33 by means of a servomotor, due to one of the control device 60 generated command signal is activated, and thereby the distance between the lens assembly 16 and light source arrangement 11 changed. This will change the characteristics of the light sources 12 . 14 . 20 emitted light changed.

The first light source 12 and the second light source 14 are preferably formed such that starting from the first light source 12 and second light source 14 Light on the first area 10a the predetermined area 10 is emitted. The third light source 20 is formed such that starting from the third light source 20 Light on the second area 10b the predetermined area 10 is emitted. By providing the (in 3 not shown) spacer element between the second and third light source 14 . 20 Preferably, there is no overlapping of the illumination of the first area 10a and the second area 10b through the respective light sources.

The first area 10a For example, it may be a circular area inside a surrounding annular second area 10b be. It may also be possible the first area 10a as two separate, adjacent circular surfaces to choose, inside a larger oval or rectangular frame as a second area 10b lie. This may be advantageous, for example, for illuminating an elongate art object which is in two sections of the first area 10a can be illuminated.

The color temperature or the color temperature range of the first range 10a the predetermined area 10 emitted light can by varying a proportion of light of the light source 12 . 14 at the first area 10a the predetermined area 10 emitted light preferably by means of the control device 60 be varied. The proportion of light of the first light source 12 and the light portion of the second light source 14 at the first area 10a the predetermined area 10 emitted light can in particular by controlling the brightness of the first light source 12 and the second light source 14 emitted light can be varied.

Furthermore, the color temperature of the second area 10b the predetermined area 10 emitted light, for example, by varying a proportion of light of the respective lighting elements 20a . 20b the third light source 20 at the second area 10b the predetermined area 10 emitted light can be varied. In addition, a light distribution of the on the predetermined area 10 emitted light by controlling the brightness of the emitted light from the first, second and third light source, in particular by controlling the brightness of the first light source 12 and the second light source 14 emitted light in relation to that of the third light source 20 emitted light can be varied.

Alternatively or additionally, it may be possible to saturate the light emitted by the first region of the first and second light sources 12 and 14 without changing the color temperature significantly. At substantially constant color temperature, it may be possible to have a different lighting effect by changing the saturation of the light of the first light source 12 and the second light source 14 without affecting the irradiated object by increased radiation. This can be an advantage, especially for radiation-sensitive or light-sensitive art exhibits.

The focusing of the first, second and third light source 12 . 14 . 20 outgoing light on the first and second area 10a . 10b the predetermined area as well as the definition of the characteristics of the light sources 12 . 14 . 20 emitted light may alternatively or in addition to the lens array 16 also by means of a suitable reflector arrangement 40 be executed. The to be illuminated predetermined area or the partial areas, in particular the first and second areas of the predetermined area may preferably by means of the lens arrangement 16 be set. For example, the position and size of the illuminated areas can be varied by a corresponding positioning, alignment or pivoting of the lens arrangement. An adjustment of the position of the illuminated areas can be carried out, for example, by turning or pivoting the lamp.

The reflector arrangement 40 extends in particular along the lamp longitudinal axis L, as in the 4 . 5 and 6 is shown. The reflector arrangement 40 is constructed as a hollow body extending along lamp longitudinal axis L, which is a first of the light source arrangement 11 facing opening 41 and one with respect to the lamp longitudinal axis L opposite to the first opening 41 located second opening 42 which is that of the light sources 12 . 14 . 20 emitted light through the two opening of the reflector assembly 40 exit.

In particular, the hollow body delimits a cross-sectional area which results in a cross-section perpendicular to the longitudinal axis L of the luminaire. This can along the lamp longitudinal axis L of the first opening 41 to the second opening 42 increase, as in the 4 and 6 is shown, or remain constant, as in 5A is shown. The trained as a hollow body reflector assembly 40 Thus, a cross-sectional shape widening along the longitudinal axis L of the luminaire, such as, for example, a conical or parabolic cross-sectional shape or a cross-sectional shape that is constant along the luminaire's longitudinal axis L, can have a cylindrical cross-sectional shape.

Furthermore, it can be provided that the light 1 a diaphragm arrangement 50 has, as exemplified in 6A is shown. The aperture arrangement 50 is designed as a transverse to the lamp longitudinal axis L extending disc, with respect to the lamp longitudinal axis L below the light source assembly 11 is arranged. cover portions 51 the aperture arrangement 50 form an opening 52 out, through which of the light sources 12 . 14 . 20 emitted light passes. The cover sections 51 can be made adjustable. In particular, it can be provided that the cover sections 51 by means of an actuating lever 53 transverse to the lamp longitudinal axis L are displaced so that the opening 52 defining edge contour is variable. For example, the cover sections can be adjusted in this way be that these a rectangular, a trapezoidal, a triangular or a polygonal edge contour of the opening 52 form. In this way, that of the light sources 12 . 14 . 20 the areal extent of the illuminated predetermined area 10 be varied. If in addition to the aperture assembly 50 a lens arrangement 16 and / or a reflector arrangement 40 is provided, the characteristic of the light can be changed in this way

For exact alignment of the light beam on the predetermined area or an object to be irradiated, the diaphragm arrangement 50 total in the circumferential direction U by a predetermined angular amount, beisielsweise by an amount between 1 degree and 45 degrees, be rotatable. As in eg 6B shown, can twist the aperture assembly 50 an operating wheel 54 be provided, for example in the form of a gear, which causes a rotation of the diaphragm assembly in or against the circumferential direction U during rotation.

The control of the light sources 12 . 14 . 20 the light 1 For example, by the control device 60 which is adapted to parameters of the illumination of the first and second light source 12 . 14 and or 20 adjust. This can be software-supported, for example.

By means of a suitable user interface numerous settings of the parameters of the individual light sources can be made 12 . 14 . 20 be made. For example, an operator may determine by means of an input device that the first light source 12 , the second light source 14 and / or the third light source 20 to generate a certain mixed color. The user interface can be designed, for example, by a smartphone or a tablet PC equipped with appropriate software.

Includes the first light source 12 For example, light-emitting diodes with a color temperature of 2500 K and the second light source 14 Light-emitting diodes with a color temperature of 4000 K, can by targeted response of the respective light-emitting diodes of the first light source 12 and the second light source 14 virtually any color temperature can be set from 2500K to 4000K. It is assumed that the light emitted by the different light sources is mixed together into a mixed light by means of suitable mixing devices, such as reflectors, diffuser plates or due to geometrical arrangements of the LEDs. The light, which is the light 1 leaves, can be described as total luminous flux and this total luminous flux can be assigned a mixed color and / or color temperature.

The luminaire may additionally have a sensor arrangement which is designed to have a color temperature of that of the first region 10a the predetermined area 10 to detect emitted radiation. For example, the sensor assembly may include a spectrophotometer capable of measuring illumination intensity in lux, most similar color temperature (CCT) in Kelvin, color coordinates in the chromaticity diagram, deviation from Planck's curve, and / or dominant wavelengths and color saturation.

The control device 60 can continue to be designed to the color temperature and / or saturation of the first light source 12 and / or the second light source 14 emitted light as a function of the determined by the sensor arrangement color temperature of the first region 10a the predetermined area 10 set emitted radiation. This can be achieved, for example, by the implementation of a control loop, by means of which the measured values of the sensor arrangement can be fed into the control device, which in turn can adjust the luminaire or the light sources in dependence on setpoint differences to the measured values.

The readings for the color temperature and / or saturation of the first light source 12 and / or the second light source 14 emitted light can be stored for example in a log or log by the control device or the sensor arrangement with a time stamp to record the course for later inspection.

Furthermore, it can also be provided to control several lights of similar or identical design via a single control device. It may be provided to use a control device of a predetermined lamp as master control for the other control devices of the other lights as slave devices.

Furthermore, the sensor arrangement can also be designed to have a color temperature that of the second area 10b the predetermined area 10 Then, with the aid of the control device, the color temperature and / or the saturation of the light emitted by the third light source can be determined 20 emitted light as a function of the determined by the sensor arrangement color temperature of the second area 10b the predetermined area 10 set emitted radiation. This can also be implemented via a control loop.

The invention is not limited to the above embodiments. Within the scope of protection, the luminaire or Rather, the method for illuminating a predetermined area also assumes a different form than those specifically described above.

LIST OF REFERENCE NUMBERS

1

lamp

2

casing

3

Sidewall of the housing

4

Light opening

5

Inner surface of the housing

10

predetermined area

10a

first area

10b

second area

11

Light source arrangement

12

first light source

12a, 12b

 light element

12a1

first light element area

12b2

second light-emitting element area

13

inner area

14

second light source

14a

light element

15

spacer

16

lens assembly

17

to inner area adjacent area

20

third light source

20a

light element

20b

light element

21

outer area

30

positioning

31

Carrier of the positioning mechanism

31a

outer peripheral surface of the carrier

31b

inner peripheral surface of the carrier

32

guide section

32a

Inner surface of the side wall of the housing

32b

lower section of the side wall of the housing

33

Actuation device of the positioning mechanism

34

half shell

35

Operating portion of the actuator

36

Operating section of the carrier

37

inner cylinder

38

outer cylinder

39

connecting ribs

40

reflector assembly

41

first opening of the reflector assembly

42

second opening of the reflector assembly

43

End portion of the reflector assembly

50

diaphragm arrangement

51

cover portions

52

opening

53

actuating lever

54

actuating wheel

60

control device

L

lights longitudinal axis

P

arrow

R

radial direction

T

supporting ribs

U

circumferential direction

α

beam angle

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2184533 A1 [0003]
• WO 2011/092625 A1 [0004]
• DE 102009044063 B3 [0005]
• EP 2257728 A2 [0006]

Claims (19)

Lamp ( 1 ) for illuminating a predetermined area ( 10 ), comprising: a light source assembly ( 11 ) by at least one first light source ( 12 ) and a second light source ( 14 ) which are adapted to emit light onto a first area ( 10a ) of the predetermined area ( 10 ), the first light source ( 12 ) is adapted to emit light of at least one color, which differs from the color of the light of the second light source ( 14 ) distinguishes; and a control device ( 60 ), which is designed to measure parameters of at least one of the light sources ( 12 . 14 . 20 ), the control device ( 60 ) is adapted to the proportion of light of the first light source ( 12 ) and the light component of the second light source ( 14 ) at which of the light source arrangement ( 11 ) of emitted light by controlling the brightness of the first light source ( 12 ) and the second light source ( 14 ) to vary light emitted. Lamp ( 1 ) according to claim 1, wherein the light source arrangement ( 11 ) additionally by a third light source ( 20 ), which is adapted to reflect light from the color of the light of the first light source ( 12 ) and the second light source ( 14 ) different color on at least one of the following areas of the predetermined area ( 10 ): (a) the first area ( 10a ), (b) a second area ( 10b ), the first area ( 10a ) and the second area ( 10b ) correspond to the predetermined area, wherein the control device is adapted to the proportion of light of the third light source ( 20 ) at which of the light source arrangement ( 11 ) of emitted light by controlling the brightness of the third light source ( 20 ) to vary light emitted. Lamp ( 1 ) according to claim 1 or 2, wherein one of the light sources ( 12 . 14 . 20 ) concentrically of at least one further light source ( 12 . 14 . 20 ), wherein in particular the first light source ( 12 ) and / or the second light source ( 14 ) in an inner area ( 13 ) of the luminaire, and a third light source ( 20 ) in an outer area ( 21 ) of the luminaire ( 1 ) the first and / or second light source ( 13 . 14 ) is arranged concentrically surrounding. Lamp ( 1 ) according to one of the preceding claims, wherein the first light source ( 12 ) several light elements ( 12a . 12b ; 12a1 . 12b2 ), wherein that of the respective lighting elements ( 12a . 12b ; 12a1 . 12b2 ) Emitted light has different colors. Lamp ( 1 ) according to one of the preceding claims, wherein the luminaire has a matrix of luminous elements, and wherein the first, second and third light source ( 12 . 14 . 20 ) each have subsets of the lighting elements. Lamp ( 1 ) according to one of the preceding claims, wherein the control device is adapted to adjust the color temperature of the light source arrangement ( 11 ) of emitted light by varying a proportion of light of the first light source ( 12 ) and a light portion of the second light source ( 14 ). Lamp ( 1 ) according to one of claims 1 to 5, wherein the control device is further adapted to reduce the saturation of the light source arrangement ( 11 ) of emitted light at a substantially constant color temperature by driving the first light source ( 12 ) and the second light source ( 14 ). Lamp ( 1 ) according to one of the preceding claims, further comprising a lens arrangement ( 16 ), which relative to the light source arrangement ( 11 ) is arranged displaceably. Lamp ( 1 ) according to claim 8, wherein the lens arrangement ( 16 ) comprises at least one lens formed of a glass material, a plastic material or a silicone material. Lamp ( 1 ) according to one of the preceding claims, furthermore with a reflector arrangement extending along a lamp longitudinal axis (L) ( 40 ). Lamp ( 1 ) according to one of the preceding claims, furthermore with a lamp longitudinal axis (L) below the light source arrangement ( 11 ) arranged aperture arrangement ( 50 ). Lamp ( 1 ) according to one of the preceding claims, wherein the first light source ( 12 ), the second light source ( 14 ) and / or the third light source ( 20 ) are formed by a plurality of light-emitting elements, in particular a plurality of LED elements, in particular chip-on-board, COB, LED modules or flip-chip LED modules. Lamp ( 1 ) according to one of the preceding claims, wherein the third light source ( 20 ) at least two different color temperatures emitting light elements ( 20a . 20b ), wherein the color temperature of the second region ( 10b ) of the predetermined area ( 10 ) of emitted light by varying a proportion of light of the at least two different light-emitting elements ( 20a . 20b ) of the third light source ( 20 ) on the second area ( 10b ) of the predetermined area ( 10 ) Emitted light can be varied by means of a control device. Method for illuminating a predetermined area ( 10 ), comprising the following method steps: emitting light onto a first area ( 10a ) of the predetermined area ( 10 ) starting from a first light source ( 12 ) a light source arrangement ( 11 ) and a second light source ( 14 ) of the light source arrangement ( 11 ), the first light source ( 12 ) Light of at least one color, which differs from the color of the light of the second light source ( 14 ), wherein the light component of the first light source ( 12 ) and the light component of the second light source ( 14 ) on the first area ( 10a ) of the predetermined area ( 10 ) emitted light by controlling the brightness of the first light source ( 12 ) and the second light source ( 14 ) emitted light is varied. The method of claim 14, further comprising emitting light from a third light source ( 20 ) of the light source arrangement ( 11 ) on at least one of the following areas of the predetermined area ( 10 ): (a) the first area ( 10a ), (b) a second area ( 10b ), the first area ( 10a ) and the second area ( 10b ) correspond to the predetermined area, the proportion of light of the third light source ( 20 ) on the first area ( 10a ) first and / or second area ( 10a . 10b ) of the predetermined area ( 10 ) emitted light by controlling the brightness of the third light source ( 20 ) emitted light is varied. A method according to claim 14 or 15, wherein a color temperature of the first region ( 10a ) of the predetermined area ( 10 ) emitted light by varying a proportion of light of the first light source ( 12 ) and / or the second light source ( 14 ) on the first area ( 10a ) of the predetermined area ( 10 ) emitted light is varied. A method according to claim 14 or 15, wherein the saturation of the first region ( 10a ) of the predetermined area ( 10 ) emitted light at a substantially constant color temperature by driving the first light source ( 12 ) and the second light source ( 14 ) is set. A method according to any one of claims 14 to 17, wherein positioning a lens assembly ( 16 ) relative to the light source assembly ( 11 ) is performed such that the first area of the predetermined area is irradiated with light having a substantially homogeneous color temperature and / or saturation over the first area. Method according to one of claims 14 to 18, wherein a color temperature of the on the second area ( 10b ) of the predetermined area ( 10 ) emitted light by varying a proportion of light of the at least two different light elements ( 20a . 20b ) of the third light source ( 20 ) on the second area ( 10b ) of the predetermined area ( 10 ) emitted light is varied.

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