WO2014037304A1

WO2014037304A1 - Lighting device and method for controlling same

Info

Publication number: WO2014037304A1
Application number: PCT/EP2013/068087
Authority: WO
Inventors: Uwe Strauss; Gerhard Kuhn
Original assignee: Osram Opto Semiconductors Gmbh
Priority date: 2012-09-05
Filing date: 2013-09-02
Publication date: 2014-03-13
Also published as: DE102012108235A1

Abstract

The invention relates to a lighting device (10, 30) comprising at least one light source (12, 36), which is arranged in a first region (14, 32) and which is designed to emit light during operation, and comprising at least one control means (16, 44), which is designed to adjust a brightness and/or spectral property of the light emitted from the light source (12, 36) dependent on a brightness and/or spectral property of the light (20, 42) falling on a second region (18, 40), said first region (14, 32) being spaced from the second region (18, 40). The invention further relates to a corresponding method for controlling a lighting device (10, 30) according to the invention.

Description

description

Lighting device and method of controlling the same There is provided a lighting device and a method of controlling the same. The

Lighting device is particularly suitable for use in an interior or in a darkened area such as in a tunnel.

This patent application claims the priority of German Patent Application 102012108235.9, the disclosure of which is hereby incorporated by reference. When entering an area illuminated with artificial light, the artificial lighting sometimes becomes uncomfortable, unnatural, cold and / or too dark

perceived; This applies in particular to the transition from an area illuminated by daylight into one with

artificial light illuminated area. This impression can be made both by a lower brightness of the artificial

produced light as well as by one of the

Color temperature of daylight Different color temperature of artificially generated light. In order for a user in an area illuminated with artificial light and

especially in the transition from a daylighted area to one with artificial light

well-lit area, it may be desirable to have the brightness and / or a spectral property,

For example, the color temperature or the color location of the artificially generated light to match the corresponding property of daylight. Also more unwanted

Effects of too much or too sudden change The lighting conditions at the transition between an area illuminated by daylight and an illuminated area with artificial light, for example, a dazzling of drivers by bright daylight when leaving a tunnel, can be advantageously avoided.

It is known to form light sources so that a spectral property of the light emitted by the light source as closely as possible of the corresponding spectral

Property corresponds to a particular form of daylight. The disadvantage of this solution is that the spectral

Property is adapted only to a particular form of daylight; For example, the spectral characteristic may typically be dominant at midday

Sunlight, however, which results in that the light emitted from the light source is too cold when the evening becomes the sun is reddish.

It is also known light sources, for example

Solid state light sources, in such a way that the

Color temperature can be set manually. The disadvantage of this solution is that it costs the user

arises, which has a disturbing effect, especially during short stays in rooms illuminated with artificial light.

Furthermore, it is known about optical fibers and mirrors

To direct daylight into windowless rooms. The disadvantage of this solution is that high costs arise and that this solution can often not be realized in existing buildings.

It is also known to use very efficient sodium vapor lamps in the entrance and exit areas of tunnels. A disadvantage of this solution is that these lamps emit a yellowish light with low color rendering index.

One problem to be solved is one

Indicate lighting device with which the

Lighting conditions in a first area to the

Light conditions in a second area at least

can be partially adjusted. In this case, the first area may in particular be an area in which little or no daylight falls, and the second area may in particular be an area in which daylight falls.

According to at least one embodiment, the

Lighting device at least one light source, which is arranged in a first region and is adapted to emit light during operation. Furthermore, the

Light source at least one control means, which

is formed, a brightness and / or spectral

Property of the light emitted by the light source as a function of a brightness and / or spectral

To set the property of the light falling in a second area, wherein the first area is spaced from the second area. For example, in operation, the control means energizes the light source as a function of the brightness and / or spectral property of the light falling into the second region.

The brightness is the intensity of the light. The spectral property may be, for example, the color locus of the light. In a further preferred embodiment, it may be in the Spectral property to the correlated color temperature of the light act.

The control means is, for example, a microcontroller.

A distance between the first area and the second

Range is preferably at least Im. Between the first region and the second region may further a

Transition area lie. By setting the brightness and / or spectral property of the light emitted by the light source as a function of the brightness and / or spectral property of the light falling into the second region, it is advantageously achieved that the smallest possible and as gradual as possible in the transition region Change in lighting conditions occurs.

The control means may adjust the brightness and / or spectral

Adjust the property of the light emitted from the light source based on predetermined information about the brightness and / or spectral property of the light falling in the second region. For example, that can

Control means the brightness of the light source

emitted light due to a predetermined typical dependence of the brightness of the day and / or

Set season.

According to at least one embodiment, the

Lighting device further comprises at least one light sensor, which is arranged in the second region and to

is formed, the brightness and / or spectral

Property of the light striking the light sensor determine. That is, the light sensor detects in operation information that depends on the brightness and / or spectral property of the incident on the light sensor light. The light sensor preferably determines at least one measured value that corresponds to the brightness and / or spectral

Property of the light incident on the light sensor is directly proportional, or a measured variable from which, for example, by the control means, the brightness and / or spectral characteristic of the light incident on the light sensor can be calculated.

The light sensor may, for example, two or three

Color sensors for measuring different spectral components of the incident on the light sensor light include. Everyone

Color sensor may be, for example, a provided with a color filter brightness sensor, or a photodiode, which is designed to preferably detect light in a specific spectral range. In particular, a first color sensor may preferably detect light in a red spectral range, a second color sensor may preferably detect light in a green spectral range, and a third color sensor may preferably light in a blue

Detect spectral range. The photodiode may be a semiconductor photodiode, such as an InGaAlP photosensor and / or a reverse driven diode.

In a preferred embodiment of

Lighting device comprises the light source at least three LED chips, which preferably emit in three different spectral ranges, and the light sensor comprises at least three color sensors, preferably light in

detect the same or similar spectral regions.

This makes it possible, advantageously, the color of the in the To determine the second region of falling light completely and by a corresponding energization of the LED chips, the color location of the light emitted by the light source

adjust accordingly.

In a further preferred embodiment of the

Lighting device comprises the light sensor two

Color sensors that prefer light in two different

Detect spectral ranges. It can be

For example, a red spectral range and a blue spectral range act. As a result, it is advantageously possible to approximately determine the color temperature of the light falling in the second region and correspondingly set the color temperature of the light emitted by the light source by means of a corresponding control of the light source. Advantageously, in this case, if only the color temperature and not the complete color location is to be adjusted, a third color sensor is saved. In a further preferred embodiment of the

Lighting device is in the light sensor is a brightness sensor. As a result, it is advantageously possible to determine the brightness of the light falling into the second region and to adjust the brightness of the light emitted by the light source accordingly by means of a corresponding control of the light source.

Advantageously, in this case, if only the

Brightness and not the color temperature or the color location to be adjusted, color sensors saved.

In a further preferred embodiment of the

Lighting device, the light sensor comprises a

(broadband) brightness sensor and a Color sensor, which preferably detects light in a (preferably narrow) spectral range. This may be, for example, a red spectral range or a blue one

Spectral range act, preferably according to one

Edge of eye sensitivity. That's it

advantageously possible, with only two sensors both the

Brightness and approximately to determine the color temperature of the light falling in the second region and to adjust the brightness and color temperature of the emitted light from the light source by an appropriate control of the light source.

If the second area is an area in which daylight falls, the light sensor is preferably arranged such that the daylight strikes the light sensor, for example in the vicinity of a window.

According to at least one embodiment of the

Lighting device comprises the light source at least one LED chip. Preferably, the light source comprises at least one light-emitting diode chip which is suitable for emitting light in the red spectral range, at least one

LED chip that is suitable to light in the green

To emit spectral range and at least one

LED chip that is capable of light in the blue

To emit spectral range.

The control means is preferably designed so that it can energize the LED chips independently of each other, so that it by suitable choice of an intensity in the red spectral range, an intensity in the green

Spectral range and an intensity in blue

Spectral range the brightness and / or spectral property of the light emitted from the light source can be adjusted over a wide range. In particular, in this way, when all the light emitting diode chips of the light source emit light, white light having a desired color location or having a desired correlated color temperature can be generated. The intensity of the light emitted by one of the light-emitting diode chips can be adjusted, for example, by means of the intensity of the current with which this light-emitting diode chip is energized. The higher the current, the higher the intensity of the emitted light.

According to at least one embodiment of the

Lighting device comprises the light source at least one light emitting diode and at least one xenon lamp. The

Light-emitting diode preferably comprises at least one

LED chip that is capable of light in the red

To emit spectral range. The light-emitting diode may comprise further light-emitting diode chips, which may be suitable for emitting light in the blue and / or green spectral range.

By combining a xenon lamp, which emits light with a relatively high color temperature, and a

LED chips, which is suitable light in the red

By emitting the LED chip, it is advantageously possible to continuously adjust the color temperature of the light emitted by the light source between the high color temperature of the xenon lamp and a lower color temperature.

According to another embodiment of the

Lighting device comprises the light source at least two white light sources, for example, two light-emitting diodes, which are adapted to emit white light during operation. Preferably, the white light sources have different Color temperatures on; For example, one of the white light sources may be a cold white light source whose color temperature may be 5500K, for example, and the other white light source may be a warm white light source whose color temperature may be 3000K, for example.

As a result, it is advantageously possible to set the color temperature of the light emitted by the light source continuously by appropriate energization of the white light sources between the two color temperatures of the white light sources. The different color temperatures can be achieved in particular by having two light-emitting diodes with

be provided different converter materials.

According to at least one embodiment of the

Lighting device is the first area

daylight-free. This means that in the first area either no light at all or at least only a part of the daylight, in particular only such a small part of the daylight, that a sufficient

Illumination of the first area from the perspective of one there

Positioned viewer is not given. In this case, advantageously, by controlling the brightness and / or spectral property of the light emitted from the light source depending on the brightness and / or spectral property of the light falling in the second region, the light conditions in the daylight-free region can be made despite the defect at real

Daylight to the lighting conditions in the second area, for example in other, lit with natural light rooms of a building to be adjusted.

The second area may in particular be an area in the vicinity of the first area, wherein between the first area and the second area

Transition area can lie. In this case, for a user moving between the first area and the second area, the extent of changes in the brightness and / or spectral property of the illumination is advantageously reduced. Furthermore, it is advantageously avoided that the user when entering the

Daylight-free area receives the impression of unnatural lighting, since the lighting conditions of the

Daylight are aligned.

The light source may preferably be designed and

be arranged so that their shape and position correspond to those of a window or a skylight. This advantageously achieves that the light source is perceived by a user as a window or skylight, which further reduces the impression that the illumination in the first area differs from natural daylighting.

According to at least one embodiment of the

Lighting device is at least one opaque between the first region and the second region

Separating element arranged. The separating element can be, for example, a house wall, a room wall or a door device. The first area may in particular be arranged in a windowless room, and the second area may in particular in an outdoor area of a

Building or be arranged in a daylight irradiated room.

According to another embodiment of the

Lighting device is the first area in a first Space and the second area disposed in a second space, and the light sensor is disposed in the second space in the vicinity of a transition to the first space. Preferably, the light sensor is arranged in the second space at a distance of less than Im, more preferably at a distance of less than 0.5m from the transition to the first space. In this

Embodiment, the lighting device

advantageously, adjust the lighting conditions in the first room so that in the vicinity of the transition between the first and the second room as small as possible

Difference in the brightness and / or spectral property of the light occurs.

Preferably, at the transition between the first region and the second region, a change in brightness of less than 25% of a brightness occurs in the first region; this is a brightness difference at the limit of perceptibility for a typical user. Particularly preferred is a change in brightness of less than 10% of a brightness in the first area, and in particular a change in brightness of less than 5% of a brightness in the first area is preferred.

According to a further embodiment, the

Lighting device at least two light sensors, and the control means is designed, depending on the

Brightness and / or spectral property of the on the

Light sensors of the light from one of the

Light sensors transmitted information and on this basis the brightness and / or spectral

Adjust the property of the emitted light from the light source. For example, a first light sensor may be arranged in a window-near area on which Daylight hits, and a second light sensor may be disposed near a junction between the second region and the first region. Advantageously, the control means in this case in daylight the

Adapting lighting conditions in the first area to the daylight, while in darkness and artificial lighting of the second area, the transition between the second

Area and the first area can be designed as continuous as possible.

According to another embodiment of the

Lighting device may be the first area in a

Entrance area and / or in an exit area of a

Tunnels and the second area to be arranged in an outer area of the tunnel. The tunnel may be

For example, to act a road tunnel or a railway tunnel.

When entering a tunnel or leaving a tunnel, the difference in light conditions inside and outside the tunnel can have a negative effect. So can

For example, the visibility of drivers may be compromised if their eyes do not immediately follow one another

sudden change in the light conditions can adapt, or the passengers of a train can in their

Activities, for example, in reading, by sudden

Changes in the lighting conditions are disturbed or obstructed. Advantageously, the present

Embodiment of the lighting device a

Gradual transition of lighting conditions when entering a tunnel and / or exit from a tunnel cause by adjusting the brightness and / or spectral property of the entrance and / or exit area of the tunnel emitted light depending on the brightness and / or spectral property of falling in the outer region of the tunnel light sets. The second area may comprise the entire area within the tunnel. Preferably, however, especially in longer tunnels, the second area only one

Entrance area and / or an exit area of the tunnel include, whereas an intermediate area inside the tunnel is equipped with energy-saving lighting.

Between the entrance area and / or the exit area and the intermediate area, there may be a transitional area in which the light conditions are continuously between the im

Entrance area and / or exit area prevailing

Light conditions and the prevailing light conditions in the intermediate area. Preferably, the length of the transition region after the

Adaptation speed of the human eye and a typical driving speed.

The invention further relates to a method for controlling a lighting device according to the invention. The

The method comprises controlling the brightness and / or spectral property of the light emitted by the light source arranged in the first region in dependence on the light source

Brightness and / or spectral property of falling in the second area light.

In accordance with at least one embodiment, the method further comprises detecting the brightness and / or spectral

Property of the light falling in the second area and transmitting information about the brightness and / or Spectral property of falling in the second area light to the control means.

In accordance with at least one embodiment, the method further comprises time-averaging the brightness and / or spectral property of the light falling in the second area and controlling the brightness and / or spectral property of the light emitted by the light source on the basis of the time-averaged brightness and / or spectral property. By the temporal averaging is achieved that the

Light conditions in the first area not unfavorably often or suddenly change, for example, when the second area is temporarily shadowed by passing clouds. By contrast, the temporal averaging effects a longer-term adaptation of the lighting conditions that the

User due to their gradual course

advantageously not at all or at least as less disturbing perceives as sudden changes. The time-averaged value can, for example, be

exponential smoothed mean or simply

be a moving average, i. For example, temporally past measured values can be measured with weights decreasing with time exponentially or with a predetermined value

Window width constant weights are weighted. A time constant of the time averaging, for example the half-life of an exponential smoothed average or the window width of a simple moving average, is preferably in the range between one minute and one hour, more preferably in the range between 3 minutes and 30 minutes and most preferably at 10 minutes. With a time constant of 10 minutes, a sufficiently fast adaptation to long-term fluctuations in the Daylight, for example due to the position of the sun or prolonged cloud cover, is guaranteed during

short-term fluctuations, for example due to

passing clouds or passing vehicles, sufficiently attenuated.

According to at least one embodiment, the method further comprises limiting the brightness and / or spectral

Property of the light emitted from the light source to a predetermined range regardless of the brightness and / or spectral property of the incident light in the second region. As a result, it is advantageously achieved that the lighting conditions in the first area remain suitable for activities in the first area, even if this is the case for those in the second area

Lighting conditions does not apply. For example, the first area may be a work space in which a brightness sufficient for work is to be ensured, and the second area may be a work space

Outdoor or a room lit by natural light. In this case, limiting the limits of the

Brightness of the light emitted from the light source to a predetermined range advantageously a sufficient brightness for the work, even if in the

Outside or the room lit by the daylight

Darkness prevails.

In another embodiment, the first area may be a living room and the second area

turn to an outdoor area or a room lit by daylight act. In this case, limiting the color location or the color temperature of the light emitted by the light source can advantageously ensure that the Color impression of the light emitted by the light source then does not deviate too much from the usual color impression of an artificial light source, for example, falls in the outdoor area or lit by the daylight room strongly reddish evening light. Despite the limitation to the predetermined range, the illumination device within these limits advantageously the

Adjust lighting conditions in the first area to those in the second area.

The range to which the brightness of light emitted from the light source is limited may preferably range from 50% below to 50% above a predetermined brightness. The predetermined brightness is, for example, an optimum working brightness. More preferably, the range can range from 25% below to 25% above the predetermined brightness.

The area to which the color temperature of the of

Light source emitted light is limited is

preferably an area in which usually the

Color temperature of artificially generated light is.

For example, the color temperature can be limited downwards by a color temperature of commercial incandescent lamps, for example, by a color temperature of 3000K, and the color temperature can be limited upwards by a color temperature of commercially available fluorescent tubes, for example by a color temperature of 5500K. Such

Limitation has the particular advantage that in the case that the light falling into the second region is artificially generated light, a complete adaptation of the

Color temperature of the emitted light from the light source the color temperature of the artificially generated light falling into the second region can take place.

According to at least one embodiment of the

Lighting device, the light source may be formed in the form of a light guide plate; that is, the

Light source can be a light diffusing surface

in which light is conducted by means of optical fibers from a region lying in a plan view of the surface laterally of the surface behind the surface, the diffusely scattering surface passes through and advantageously with a

comparatively homogeneous spatial distribution is emitted. According to another embodiment of the

Lighting device, the light source may have a light diffusing surface, behind which

Partial light sources spaced from each other, preferably arranged at regular intervals. The distance between two adjacent partial light sources is preferably chosen so that the through the two adjacent

Partial light sources jointly generated at the midpoint between the soldering points of the two partial light sources

Light intensity not lower than that, in particular

preferably equal to the light intensity which generates one of the partial light sources at its solder point. In this case, the soldering point of a partial light source is that point on the diffusely scattering surface which is closest to the partial light source, to which a solder which has been precipitated from the partial light source onto the diffusely scattering surface strikes.

In at least one embodiment of the

Lighting device, the light source at least two Fluorescent lamps, such as compact fluorescent lamps, with different color locations include.

In all embodiments of the illumination device in which the light source comprises at least two partial light sources, the illumination device can have a

Have a mixing structure that the of the

Partial light sources generated light mixes. In all embodiments of the illumination device, in which the light source comprises light emitting diodes, the

Light-emitting diodes in particular be organic light-emitting diodes.

According to at least one embodiment of the

Lighting device, the illumination is carried out indirectly via a light diffuse reflecting surface, such as a ceiling or a wall; that is, the light source is arranged so that the light emitted from the light source first incident on the light diffuse reflecting surface and the first area diffused by that of the light

reflecting surface diffused light is illuminated.

Another advantage of an inventive

Lighting device and an inventive

Method for controlling the same is that

Energy can be saved if the brightness of the

Light source is adjusted in response to the brightness of the light falling in the second region, instead of assuming a constant value even if the light falling in the second region, for example at night, has a low brightness. Below is the one described here

Lighting device explained in more detail with reference to embodiments and figures. 1 shows a lighting device according to a first embodiment in a schematic plan view.

2 shows a lighting device according to a second embodiment in a schematic

Top view .

FIG. 3 shows a lighting device according to a third exemplary embodiment in a schematic perspective view.

Figures 4a, 4b, 5a, 5b, 6a and 6b show schematically

Plots of the CIE standard color chart, with reference to which the operation of a lighting device is explained according to a fourth embodiment.

In the embodiments and figures are the same or equivalent components each with the same

Provided with reference numerals. The illustrated elements are not to be considered as true to scale; rather, individual can

Elements exaggerated for better understanding

be shown. 1 shows a lighting device 10 according to a first embodiment in a schematic plan view. The illumination device 10 comprises a light source 12, which is arranged in a first region 14. At the first Region 14 may be, for example, an interior in which no daylight falls. The

Lighting device further comprises a control unit 16, with which the brightness and / or a spectral property, for example the color location, of the light emitted by the light source 12 can be controlled.

At a distance from the first region 14, a second region 18 is arranged. The aim of the control of the light source 12 by the control unit 16 is the light conditions in the first region 14 at least partially to the

Adjusting light conditions in the second region 18, in particular to adjust the brightness and / or spectral property of the light emitted by the light source 12 in dependence on the brightness and / or spectral property of the incident light 20 in the second region 18.

2 shows a lighting device 10 according to a second embodiment in a schematic

Top view. In this embodiment, the

Lighting device further comprises a light sensor 22 which is arranged in the second region 18. The light sensor 22 serves to determine the brightness and / or spectral property of the light 20 falling into the second region 18.

The information determined by the light sensor 22 can be transmitted to the control unit 16 either via a cable connection (not shown) or preferably via a wireless radio link, for example via a radio signal with a frequency of 2.4 GHz. The control unit 16 evaluates the transmitted information and controls the brightness and / or spectral on this basis

Feature of the light source 12. In the second exemplary embodiment, a dividing wall 24 is furthermore arranged between the first region 14 and the second region 18. The partition can be, for example, a room wall or an exterior wall of a building. An opening (not shown), for example a door or a window, may be located in the dividing wall, as a result of which a transition between the lighting conditions in the first area and the lighting conditions in the second area is achieved.

In a particularly simple embodiment, the

Control means 16 each directly control the brightness and the spectral characteristic of the light source 12 so that they are as accurate as possible with the brightness and the spectral

Property of falling in the second region 18 light 20 match. In typical applications, however, an immediate and complete approximation of the

Lighting conditions in the two areas may not be desirable.

In a typical application, the second area 18 is an area where daylight falls and the first area 14 is an area where no daylight falls and which is reachable by a user from the second area 18. The transition between the first region 14 and the second region 18 may be more comfortable for the user if the lighting conditions in the two regions are less different than would be the case using a conventional illumination device. However, it is typically not

advantageous if the lighting conditions in the first region 14 are aligned directly and completely with the light conditions in the second region 18. For example it with temporary shading of the second area 18, for example by a passing cloud,

typically not desired that in the first

Area 14 emitted light is darkened to the same extent as the incident in the second area 18 light 20. Similarly, although an adjustment of the color locus of the first in

Region 14 of emitted light to the color locus of the light 20 falling into the second region 18 to a certain extent be desired; however, typically, for example, it is undesirable that the color location of the light emitted into the first region 14 be fully aligned with the color locus of reddish evening light incident on the second region 18. 3 shows a lighting device 30 according to a third embodiment in a schematic

Perspective view. In this exemplary embodiment, the first area is an entrance area 32 of a tunnel 34. A light source 36 is arranged in the entrance area 32, for example on the wall or on the ceiling of the tunnel 34. A light sensor 38 is disposed in the outer region 40 of the tunnel 34 in front of the entrance area 32 and

detects the daylight 42 falling in the outer area 40. A control unit 44 controls, on the basis of the

Light sensor 38 determined information about the

Outdoor lighting conditions the lighting of the

Entrance area 32 through the light source 36th

FIGS. 4 to 6 schematically show plots of the CIE standard color chart on the basis of which the mode of operation of a

Lighting device according to a fourth

Embodiment will be explained in more detail. In the

Standard color charts show the white point E, which appears on the Blackbody curve lies. In this embodiment, the spectral property is the

Color temperature; that is, the control means is to

configured to adjust the color temperature of the light emitted by the light source as a function of the color temperature of the light falling in the second region. The figures denoted by a) each show a standard color chart in which the color temperature of the in the second area

falling light is marked, and the figures designated b) each show a standard color chart in which the color temperature of the emitted light from the light source is marked.

In FIG. 4 a, the cross 50 marks a color temperature of evening light of approximately 3000 Kelvin falling into the second area. In Figure 4b is with the cross 52 the

Color temperature of the emitted light from the light source marked. This is in this case also about 3000 Kelvin; that is, the control means has the

Color temperature of the light emitted from the light source completely matched to the color temperature of falling in the second area evening light.

In FIG. 5a, the cross 54 marks a color temperature of midday light falling in the second region of approximately 6500 Kelvin. In FIG. 5b, the cross 56 marks the color temperature of the light emitted by the light source. This is also about 6500 Kelvin in this case; that is, even in this case has that

Control means, the color temperature of the light emitted from the light source completely matched to the color temperature of the falling in the second range midday light. As the color temperature of 6500 Kelvin is outside the usual light sources

Light temperature range, the artificial

Lighting with a color temperature of 6500 Kelvin

unfamiliar or disturbing. In a preferred

Therefore, according to the embodiment of the illumination device, the control means limits the color temperature of the light emitted by the light source to a common range, for example to a range between 3000K and 5500K.

In the figure 6a is with the cross 58 again a

Color temperature of falling in the second area

Nocturnal light of about 6500 Kelvin marked. In Figure 6b is the cross 60, the color temperature of the of

Light source emitted light marked. This is now due to the limitation to the predetermined range only about 5500 Kelvin; that is, in this case, the control means has only partially matched the color temperature of the light emitted by the light source to the color temperature of the midday light falling in the second region, up to the limit of the predetermined range.

The invention is not limited by the description with reference to the embodiments. Rather, the includes

Invention every new feature as well as every combination of

Features, which includes in particular any combination of features in the claims, even if this feature or this combination itself is not explicitly in the

Claims or the embodiments is given.

Claims

claims

1. lighting device (10, 30) comprising

- At least one light source (12, 36) disposed in a first region (14, 32) and is adapted to emit light in operation, and

- At least one control means (16, 44) which is adapted to a brightness and / or spectral

Property of the light emitted by the light source (12, 36) as a function of brightness and / or

to adjust the spectral property of the light (20, 42) incident in a second region (18, 40), the first

Region (14, 32) from the second region (18, 40) is spaced apart.

2. lighting device (10, 30) according to claim 1, wherein a distance between the first region (14, 32) and the second region (18, 40) is at least Im.

3. lighting device (10, 30) according to claim 1 or 2, wherein the illumination device (10, 30) further comprises at least one light sensor (22, 38), in the second

Region (18, 40) is arranged and adapted to the brightness and / or spectral property of the on the

To detect light sensor (22, 38) of incident light.

4. lighting device (10, 30) according to one of

preceding claims, wherein the light source (12, 36) comprises at least one LED chip.

5. Lighting device (10, 30) according to claim 4, wherein the light source (12, 36) at least one LED chip, which is suitable to light in the red spectral range emit, at least one LED chip, which is suitable to emit light in the green spectral range and at least one LED chip, which is suitable to emit light in the blue spectral range comprises.

6. lighting device (10, 30) according to one of

preceding claims, wherein the first area (14, 32) is daylight-free.

7. Lighting device (10) according to one of

preceding claims, wherein between the first region (14) and the second region (18) at least one

opaque separating element (24) is arranged.

8. Lighting device (10) according to one of

previous claims, wherein the first area (14) in a windowless room and the second area (18) in an outdoor area of a building or in a

daylight irradiated space is arranged.

9. lighting device (10) according to one of

preceding claims, wherein the first region (14) in a first space and the second region (18) is arranged in a second space and the light sensor (22) is arranged in the second space in the vicinity of a transition to the first space.

10. Lighting device (30) according to one of claims 1 to 7, wherein the first region in an input region (32) and / or in an exit region of a tunnel (34) and the second region in an outer region (40) of the tunnel (34). is arranged.

11. A method for controlling a lighting device (10, 30) according to one of the preceding claims,

marked by

Controlling the brightness and / or spectral property of the light emitted by the light source (12, 36)

Dependence on the brightness and / or spectral

Property of the light falling into the second region (18, 40) (20, 42).

12. A method of controlling a lighting device (10, 30) according to claim 11, the method further comprising:

- Detecting the brightness and / or spectral

Property of the second area (18, 40) falling light (20, 42) and

- Transmission of information about the brightness and / or spectral property of the second area (18, 40) falling light (20, 42) to the control means (16, 44).

13. A method of controlling a lighting device (10, 30) according to claim 12, the method further comprising:

Temporal means of information about the

Brightness and / or spectral property of the light (20, 42) falling into the second region (18, 40) and

Controlling the brightness and / or spectral property of the light emitted by the light source (12, 36) on the basis of the time-averaged brightness and / or spectral property.

14. A method for controlling a lighting device (10, 30) according to any one of claims 11 to 13, wherein the

Method further comprises:

- Limiting the brightness and / or spectral

Property of the light emitted from the light source (12, 36) to a predetermined range regardless of the brightness and / or spectral characteristic of the second area (18, 40) falling light (20, 42).