DE202020101056U1 - Lighting device - Google Patents

Abstract

Lighting device (1) for illuminating a work surface (2), which is set up to illuminate a predetermined area (B) of the work surface (2) with a predetermined total illuminance, characterized in that the lighting device (1) has at least one diffuse light source (3) comprises, which is set up to emit diffuse light (4) with a first illuminance (44) on the work surface (2), and comprises at least one directed light source (5), which is set up to at least one directed light beam (6) with a second illuminance (45) on the work surface (2), the predetermined area (B) of the work surface (2) being illuminable by means of the at least one diffuse light source (3) and / or the at least one directed light source (5) , the sum of the two illuminances (44, 45) corresponding to the predetermined total illuminance.

Description

The invention relates to a lighting device for illuminating a work surface, which is set up to illuminate a predetermined area of the work surface with a predetermined total illuminance.

Office lights which illuminate a workplace with a certain illuminance are already known. However, a disadvantage of such office lights is that the light emitted by the office lights is not simultaneously suitable for different activities to be carried out. For example, photographers have different lighting requirements for their work as office workers.

The object of the invention is at least to avoid the disadvantage described above and to provide a lighting device which is improved compared to the prior art.

This object is achieved by the features of independent claim 1.

Advantageous embodiments of the invention are defined in the dependent claims.

An essential idea with regard to the lighting device according to the invention is that the lighting device comprises at least one diffuse light source which is set up to emit diffuse light with a first illuminance on the work surface and comprises at least one directional light source which is set up to to emit at least one directed light beam with a second illuminance on the work surface, the predetermined area of the work surface being illuminable by means of the at least one diffuse light source and / or the at least one directed light source, the sum of the two illuminance values corresponding to the predetermined total illuminance. At least one diffuse light source and at least one directed light source are thus provided, through which the same predetermined area of the work surface can be illuminated. Furthermore, the lighting device is suitable for several activities, since both diffuse light and directional light beams can be emitted. The directed light rays ensure hard light and high contrast, so that shadow edges are clearly visible. This is comparable to daylight on a cloudless day. A diffuse light, on the other hand, provides soft light that illuminates a room to be illuminated evenly, with little contrast and with little shadow. Such diffuse light is comparable to daylight in overcast skies or in fog.

According to one embodiment, at least one dimming element can be provided, by means of which the total illuminance of the lighting device can be adjusted, preferably taking into account an illuminance provided by ambient light. As a result, the lighting device or more precisely the illuminance on the work surface is adapted to different requirements, for example legal requirements, e.g. for computer workstations, adaptable, preferably taking into account the basic brightness on the work surface (for example, by daylight or other neighboring lights). With regard to the feature according to which the sum of the two illuminances of the at least one diffuse light source and the at least one directed light source corresponds to the predetermined total illuminance, this means that this sum can correspond to the predetermined total illuminance taking into account an illuminance provided by ambient light.

In addition, at least one dimming device can be provided, by means of which the first illuminance of the at least one diffuse light source and / or the second illuminance of the at least one directed light source can be set, preferably the ratio of the first illuminance and the second illuminance to one another using the at least one dimming device is adjustable. The total illuminance of the lighting device can thus be adjustable by means of a dimming element, possibly taking into account an illuminance provided by ambient light, and / or the ratio of the first illuminance and the second illuminance to one another can be adjusted by means of a dimming device, so that the sum of the two illuminances of the preferably adjustable, overall illuminance, possibly taking into account an illuminance provided by ambient light. With regard to the ratio, 100% diffuse light and 0% directional light rays, or 0% diffuse light and 100% directional light rays, or any ratio in between can thus be adjustable by means of the dimming device.

According to a further embodiment, at least one sensor can be provided with which a brightness can be measured on the work surface and / or a person working on the work surface can be detected.

Furthermore, it can be provided that the at least one diffuse light source is a Lambert radiator. A Lambert spotlight is understood to mean a spotlight whose luminance or Radiance is essentially the same in all directions. The luminous intensity distribution body of such a Lambert radiator is thus a sphere with the radiator surface as a tangential surface. In connection with the invention, however, it is pointed out that essentially only the predetermined area of the work surface can be uniformly illuminated by the diffuse light source which may be designed as a Lambert radiator.

A spot, for example, is suitable as a directed light source.

• 1 eine Beleuchtungsvorrichtung zur Beleuchtung einer Arbeitsfläche gemäß einer ersten Ausführungsform in einer Seitenansicht,
• 2 die Beleuchtungsvorrichtung zur Beleuchtung einer Arbeitsfläche in einem ersten Betriebszustand in einer Seitenansicht,
• 3 die Beleuchtungsvorrichtung zur Beleuchtung einer Arbeitsfläche in einem zweiten Betriebszustand in einer Seitenansicht,
• 4 ein schematisches Schaltbild der Beleuchtungsvorrichtung,
• 5 die Beleuchtungsvorrichtung zur Beleuchtung einer Arbeitsfläche gemäß einer weiteren Ausführungsform in einer Seitenansicht,
• 6 die Beleuchtungsvorrichtung in einer Ansicht von unten,
• 7 eine Beleuchtungsvorrichtung gemäß einer weiteren Ausführungsform in einer schematisch dargestellten perspektivischen Ansicht,
• 8 eine erste Seitenansicht der Beleuchtungsvorrichtung gemäß 7,
• 9 eine zweite Seitenansicht der Beleuchtungsvorrichtung gemäß 7,
• 10 eine Draufsicht von oben auf die Beleuchtungsvorrichtung gemäß 7,
• 11 eine Querschnittsebene der Beleuchtungsvorrichtung gemäß 7 entlang der in der 9 eingezeichneten Querschnittsebene 25 samt einem vergrößerten Ausschnitt,
• 12 eine Beleuchtungsvorrichtung gemäß einer weiteren Ausführungsform in einer schematisch dargestellten perspektivischen Ansicht,
• 13a) ein erstes Ausführungsbeispiel zur Einstellung der Beleuchtungsstärken der diffusen Lichtquelle und der gerichteten Lichtquelle, und
• 13b) ein zweites Ausführungsbeispiel zur Einstellung der Beleuchtungsstärken der diffusen Lichtquelle und der gerichteten Lichtquelle.

Further details and advantages of the invention are explained in more detail below with reference to the description of the figures and with reference to the drawings. In it show:

• 1 1 shows a lighting device for lighting a work surface according to a first embodiment,
• 2nd the lighting device for illuminating a work surface in a first operating state in a side view,
• 3rd the lighting device for illuminating a work surface in a second operating state in a side view,
• 4th 1 shows a schematic circuit diagram of the lighting device,
• 5 the lighting device for illuminating a work surface according to another embodiment in a side view,
• 6 the lighting device in a view from below,
• 7 1 shows a lighting device according to a further embodiment in a schematically illustrated perspective view,
• 8th a first side view of the lighting device according to 7 ,
• 9 a second side view of the lighting device according to 7 ,
• 10th a top view of the lighting device according to 7 ,
• 11 a cross-sectional plane of the lighting device according to 7 along the in the 9 drawn cross-sectional plane 25th including an enlarged section,
• 12th 1 shows a lighting device according to a further embodiment in a schematically illustrated perspective view,
• 13a) a first embodiment for setting the illuminance of the diffuse light source and the directional light source, and
• 13b) a second embodiment for setting the illuminance of the diffuse light source and the directional light source.

1 shows a lighting device 1 for illuminating a work surface that is set up to a predetermined area B the work surface 2nd to illuminate with a predetermined total illuminance. The lighting device 1 includes a diffuse light source 3rd that is set up to diffuse light 4th with a first illuminance 44 on the work surface 2nd to emit, and two directional light sources 5 that are set up to receive a multitude of directed light beams 6 with a second illuminance 45 on the work surface 2nd to emit, using the diffuse light source 3rd and / or the two directed light sources 5 the predetermined range B the work surface 2nd can be illuminated, the sum of the two illuminances 44 , 45 corresponds to the predetermined total illuminance.

Furthermore, the control element 10th can be seen, for example also a dimming element 7 and / or a dimming device 8th and / or an on / off switch 9 can be provided (not shown, see 4th ). It can be at least one dimming element 7 and / or the at least one dimming device 8th and / or the on / off switch 9 in the control element 10th be integrated. By means of the dimming element 7 is the total illuminance of the lighting device 1 , preferably taking into account an illuminance provided by ambient light. The opposite is about the dimmer 8th the first illuminance 44 the diffuse light source 3rd and / or the second illuminance 45 of the two directed light sources 5 adjustable. However, preferably by means of the dimming device 8th the ratio of the first illuminance 44 and the second illuminance 45 be adjustable to each other. It can therefore have at least one dimming device 8th be provided, by means of which the first illuminance 44 the at least one diffuse light source 3rd and / or the second illuminance 45 the at least one directional light source 5 is adjustable, preferably being by means of the at least one dimming device 8th the ratio of the first illuminance 44 and the second illuminance 45 is adjustable to each other. Alternatively, at least two dimming devices can also be provided, the first illuminance being achieved by means of a first dimming device 44 the at least one diffuse light source 3rd is adjustable and the second illuminance is achieved by means of a second dimming device 45 the at least one directional light source 5 is adjustable.

In addition, as described above, an on / off switch 9 be provided, via which the lighting device 1 can be switched on and off. Such switching on and off can also be done via the dimming element 7 take place, the lighting device 1 can be switched off by dimming to 0% total illuminance and switching on the lighting device 1 by dimming the total illuminance to a total illuminance not equal to zero. As a dimming element 7 and dimmer 8th buttons, potentiometers and encoders are suitable. Furthermore, the control element 10th also have a touch display, via which the lighting device 1 operator 12th all settings (e.g. on / off, dimming the total illuminance, dimming the ratio of the first illuminance 44 and the second illuminance 45 to each other, etc.) of the lighting device 1 can change. Alternatively, it would also be conceivable for the lighting device 1 to control and / or regulate via an application that can be installed on a cell phone or tablet.

2nd shows the lighting device 1 according to 1 , unlike the 1 the ratio of the first illuminance 44 and the second illuminance 45 to each other by means of the dimmer 8th (not shown) was changed. More specifically, the percentage of the first illuminance was 44 of diffuse light 4th on the work surface 2nd in relation to the total illuminance of the lighting device 1 reduced to 0% and thus the percentage of the second illuminance 45 of the directed light rays 6 on the work surface 2nd in relation to the total illuminance of the lighting device 1 increased to 100%.

3rd shows the lighting device 1 according to 1 , unlike the 1 the ratio of the first illuminance 44 and the second illuminance 45 to each other by means of the dimmer 8th was changed. More specifically, the percentage of the first illuminance was 44 of diffuse light 4th on the work surface 2nd in relation to the total illuminance of the lighting device 1 increased to 100% and thus the percentage of the second illuminance 45 of the directed light rays 6 on the work surface 2nd in relation to the total illuminance of the lighting device 1 reduced to 0%.

4th shows a schematic circuit diagram of a preferred embodiment of the lighting device 1 . The lighting device 1 has a power plug 18th on which the lighting device 1 can be connected to a power supply system, so that the lighting device 1 can be powered. Furthermore, the lighting device 1 a diffuse light source 3rd through which diffuse light 4th is emittable, and a directional light source 5 through which directed light rays 6 are emittable. The diffuse light source 3rd has a diffuser in this regard 15 and the directional light source 5 has a bundle element in this regard 14 on. It can thus be provided that the at least one diffuse light source 3rd at least one diffuser 15 and / or has at least one microprism and / or that the at least one diffuse light source 3rd is essentially flat. Furthermore, it can be provided that the at least one directed light source 5 at least one bundle element 14 has, preferably wherein the at least one bundle element 14 is a reflector or a lens.

It can also be seen that the lighting device 1 one ballast each 16 , 17th for the diffuse light source 3rd and the directional light source 5 includes. In addition, as in the present exemplary embodiment, at least one control and / or regulating unit can 13 to control and / or regulate the light sources 3rd , 5 be provided. This control and / or regulation unit 13 is with a control 10th and a sensor 11 connected. Via the control element 10th a person can do this 12th the light sources 3rd , 5 operate and via the sensor 11 are the light sources 3rd , 5 automatically controllable and / or adjustable. It can therefore have at least one sensor 11 be provided with which a brightness on the work surface 2nd is measurable and / or one on the work surface 2nd active person is detectable. At least two sensors can preferably also be provided, with a brightness on the work surface by means of a first sensor 2nd is measurable and by means of a second sensor on the work surface 2nd active person 12th is detectable.

The control element 10th also has a dimming element 7 and a dimmer 8th on, using the dimming element 7 the total illuminance of the lighting device 1 , preferably taking into account an illuminance provided by ambient light, and can be adjusted via the dimming device 8th the first illuminance 44 the diffuse light source 3rd and / or the second illuminance 45 the directional light source 5 is adjustable, preferably by means of the dimming device 8th the ratio of the first illuminance 44 the diffuse light source 3rd and the second illuminance 45 the directional light source 5 is adjustable to each other. There is also an on / off switch 9 provided, which for switching the lighting device on and off 1 serves. Such an on / off switch 9 is not absolutely necessary, however, since the lighting device 1 , as described above, also via the dimming element 7 can be switched on and off. Since in the present exemplary embodiment there is also a sensor 11 is provided with which one on the work surface 2nd active person is detectable, the lighting device 1 also via the presence function of the sensor 11 together with the control and / or regulating unit 13 be switched on and off. Furthermore, the sensor 11 a brightness (e.g. basic brightness such as daylight or brightness of other lights) on the work surface 2nd measure and this brightness value to the control and / or regulating unit 13 to transfer. The control and / or regulation unit 13 then controls and / or regulates the lighting device 1 such that the illuminance of the lighting device 1 is just so high that the sum of illuminance of the lighting device 1 and illuminance of the basic brightness of the dimming element 7 set total illuminance. Alternatively, the dimming element could also be used 7 be omitted, and the control and / or regulating unit 13 programmed to a legally prescribed illuminance (e.g. 500lux for a work station) so that the control and / or regulating unit 13 then the illuminance of the lighting device 1 controls and / or regulates depending on the specified illuminance and the illuminance of the measured brightness.

5 shows a lighting device 1 for illuminating a work surface 2nd according to a further embodiment. Here is the lighting device 1 designed as a pendant lamp. Overall, it can therefore be provided that the lighting device 1 as a floor lamp ( 1 to 3rd ) or pendant lamp ( 5 ) is trained. Here, too, is the lighting device 1 set up a predetermined range B the work surface 2nd to illuminate with a predetermined total illuminance and in this respect in turn comprises a diffuse light source 3rd that is set up to diffuse light 4th with a first illuminance 44 on the work surface 2nd to emit, and two directional light sources 5 that are set up to receive a multitude of directed light beams 6 with a second illuminance 45 on the work surface 2nd to emit, using the diffuse light source 3rd and / or the two directed light sources 5 the predetermined range B the work surface 2nd can be illuminated, the sum of the two illuminances 44 , 45 corresponds to the predetermined total illuminance. Furthermore, it is possible for the at least one directional light source 5 is arranged in a recess. The lighting device designed as a pendant lamp 1 can in turn be a control element 10th and / or a control and / or regulating unit 13 include (not shown, see 4th ), via which the lighting device 1 is controllable and / or regulatable.

6 shows the lighting device 1 in a bottom view. Here are the housing 19th , the two directed light sources 5 and the diffuse light source 3rd (shown hatched). It can therefore be provided that the at least one diffuse light source 3rd and the at least one directional light source 5 in a common housing 19th are arranged. Furthermore, the lighting device 1 one towards the work surface 2nd pointing radiation surface 20th have, wherein the at least one diffuse light source 3rd more than 50%, preferably more than 75%, particularly preferably more than 90%, of the radiation area 20th occupies. In this regard, the diffuse light source 3rd a luminous area 21 on and the directional light sources 5 each have a luminous surface 22 on. It can therefore advantageously be provided that the at least one directed light source 5 is flat and preferably essentially the rest of the radiation area 20th occupies.

The 7 to 11 show a lighting device 1 according to a further embodiment. In this case, the lighting device 1 designed as a floor lamp, with a support foot 26 is provided, via which the lighting device 1 is supported on a surface.

The lighting device 1 also includes a housing 19th in which a diffuse light source 3rd and spaced apart from two directed light source 5 are arranged.

The housing 19th is with the support foot 26 over a vertical column 24th connected.

In the vertical column 24th can, as in the case shown, a control element 10th , for example in the form of a touch panel, via which the lighting device 1 is controllable and / or regulatable.

In the vertical column 24th can also electronics 42 the lighting device 1 be integrated.

As shown in the cross-sectional representation 11 and in particular the enlarged section contained therein, the directed light sources point 5 at least one LED each 27 on, the light of at least one bundle element 14 in the form of a reflector in the direction of the support leg 26 can be radiated directionally.

The diffuse light source 3rd also includes several LEDs 28 , which is from the LEDs 28 emitted light is converted into a diffuse light by at least one microprism. In contrast to the directional light sources 5 emits the diffuse light source 3rd diffused light.

The illuminance 44 , 45 of the directed light sources 5 and the diffuse light source 3rd can be controlled and / or regulated in different ways (see also 13a), b )).

According to a preferred embodiment, the ratio of illuminance can be 44 of the directed light sources 5 and the illuminance 45 the diffuse light source 3rd steplessly adjust to each other by means of at least one dimming device, a predetermined total illuminance remaining the same.

In addition to the directional light sources 5 and the diffuse light source 3rd includes the lighting device 1 an indirect light source 41 (compare the 10th and 11 ), which is set up to use an indirect light component to illuminate the work surface 2nd to emit, at least one dimming device being provided, with which an illuminance and / or a light color of that of the indirect light source 41 emitted light continuously and / or independently of an adjustability of the first illuminance 44 of diffuse light 4th and / or the second illuminance 45 of the at least one directed light beam 6 , is adjustable.

The indirect light source 41 includes multiple LEDs 43 .

The indirect light source 41 emits light upwards, i.e. not towards the work surface 2nd . There the light is reflected on the ceiling, for example, and then reaches the work surface indirectly 2nd .

The lighting device 1 includes a sensor 11 , with which a brightness on the work surface 2nd is measurable and / or one on the work surface 2nd active person is detectable, the sensor 11 can be activated and deactivated via a switch, with activation of the sensor 11 the illuminance 44 , 45 the diffuse light source 3rd , the directional light sources 5 and / or the indirect light source 41 automatically in such a way into the electronics 42 integrated control and / or regulation unit 13 that can be regulated and / or controlled by the sensor 11 measured brightness remains constant.

The control and / or regulation unit 13 can have at least one communication interface for, preferably wireless, communication with at least one mobile processor-controlled terminal, preferably a cell phone. Communication with a cell phone, which can take place, for example, via Bluetooth, can also be used to control and / or regulate the lighting device depending on the time of day 1 will be realized.

12th shows a lighting device 1 according to a further embodiment in a schematically represented perspective view. In this embodiment, the lighting device 1 also designed as a floor lamp, with a housing 19th , in which at least one directional light source 5 and at least one diffuse light source 3rd is arranged, and a support foot 26 over a vertical column 24th and an elbow 29 are interconnected.

The 13a) shows a first embodiment for adjusting the illuminance 44 , 45 the at least one diffuse light source 3rd and the at least one directional light source 5 a lighting device 1 . Specifically, the curves of the first illuminance are in relative values between 0% and 100% 44 (solid line) of the at least one diffuse light source 3rd and the second illuminance 45 (dashed line) of the at least one directional light source 5 shown depending on the time t. After switching on the lighting device 1 emit at least one diffuse light source 3rd and the at least one directional light source 5 each 100% of their illuminance 44 , 45 . At first press 30th a switch of a control element 10th becomes the illuminance 45 linearly reduced from 100% to 0% within 4s, for example, whereas the illuminance 44 remains constant. With a second actuation 31 the switch becomes the illuminance 45 linearly increased from 0% to 100% within 4s, with the illuminance 44 remains constant, and then the illuminance 44 linearly reduced from 100% to 0% within 4s, for example, whereas the illuminance 45 remains constant. With a third actuation 32 the switch becomes the illuminance 44 linearly increased from 0% to 50% within 2s, with the illuminance 45 remains constant. By a fourth actuation 33 , eg in the form of a double click, the initial state can be reached again.

The fourth actuation 33 can be done at any time. Furthermore, the duration of the first, second and third operations can be 30th , 31 , 32 also intermediate values of the two illuminance levels 44 , 45 to adjust.

The 13b) shows a second embodiment for adjusting the illuminance 44 , 45 the at least one diffuse light source 3rd and the at least one directional light source 5 a lighting device 1 . After switching on the lighting device 1 emit at least one diffuse light source 3rd and the at least one directional light source 5 each 50% of their illuminance 44 , 45 . At first press 34 a switch of a control element 10th becomes the illuminance 45 linearly reduced from 50% to 0% within 4s and at the same time the illuminance 44 increased linearly from 50% to 100%, the total illuminance being the sum of the two illuminances 44 , 45 corresponds, remains the same. With a second actuation 35 the switch becomes the illuminance 44 linearly reduced from 100% to 75% within 2s and at the same time the illuminance 45 increased linearly from 0% to 25%. With a third actuation 36 the switch becomes the illuminance 44 linearly increased from 75% to 100% within 2s and at the same time the illuminance 45 reduced linearly from 25% to 0%. With a fourth actuation 37 the switch becomes the illuminance 44 linearly reduced from 100% to 0% within 8s and at the same time the illuminance 45 increased linearly from 0% to 100%. With a fifth push 38 , eg in the form of a double click, the initial state can be reached again.

The fifth actuation 38 can be done at any time. Furthermore, the duration of the first, second, third and fourth operations 34 , 35 , 36 , 37 also intermediate values of the two illuminance levels 44 , 45 to adjust.

Reference list

1

Lighting device

2nd

Work surface

3rd

Diffuse light source

4th

Diffused light

5

Directed light source

6

Directed beam of light

7

Dimming element

8th

Dimming device

9

On / off switch

10th

Control element

11

sensor

12th

person

13

Control and / or regulation unit

14

Bundle element

15

Diffuser

16

Ballast

17th

Ballast

18th

Power plug

19th

casing

20th

Radiation area

21

Illuminated surface of the diffuse light source

22

Illuminated surface of the directional light source

23

Microprism

24th

Vertical column

25th

Cross-sectional level

26

Support leg

27

LED

28

LED

29

Elbow

30th

First press

31

Second press

32

Third operation

33

Fourth operation

34

First press

35

Second press

36

Third operation

37

Fourth operation

38

Fifth actuation

41

Indirect light source

42

electronics

43

LED

44

First illuminance

45

Second illuminance

B

Area

Claims (19)

Lighting device (1) for illuminating a work surface (2), which is set up to illuminate a predetermined area (B) of the work surface (2) with a predetermined total illuminance, characterized in that the lighting device (1) has at least one diffuse light source (3) comprises, which is set up to emit diffuse light (4) with a first illuminance (44) on the work surface (2), and comprises at least one directed light source (5), which is set up to at least one directed light beam (6) with a second illuminance (45) on the work surface (2), the predetermined area (B) of the work surface (2) being illuminable by means of the at least one diffuse light source (3) and / or the at least one directed light source (5) , the sum of the two Illuminance (44, 45) corresponds to the predetermined total illuminance. Lighting device (1) after Claim 1 At least one dimming element (7) is provided, by means of which the total illuminance of the lighting device (1) can be adjusted, preferably taking into account an illuminance provided by ambient light. Lighting device (1) after Claim 1 or 2nd At least one dimming device (8) is provided, by means of which the first illuminance (44) of the at least one diffuse light source (3) and / or the second illuminance (45) of the at least one directed light source (5) can be adjusted, preferably by means of the at least one dimming device (8), the ratio of the first illuminance (44) and the second illuminance (45) to one another, preferably continuously, is adjustable. Lighting device (1) after Claim 3 , at least one dimming device (8) being provided, by means of which the first illuminance (44) of the at least one diffuse light source (3) and the second illuminance (45) of the at least one directed light source (5) can be set, whereby by means of the at least one Dimming device (8) the ratio of the first illuminance (44) and the second illuminance (45) to one another is adjustable, preferably with the predetermined total illuminance remaining the same. Lighting device (1) after Claim 3 or 4th At least two dimming devices are provided, the first illuminance (44) of the at least one diffuse light source (3) being adjustable by means of a first dimming device and the second illuminance (45) of the at least one directed light source (5) being adjustable by means of a second dimming device is. Lighting device (1) according to one of the Claims 1 to 5 , wherein the lighting device (1) comprises at least one indirect light source (41), which is set up to emit an indirect light component for illuminating the work surface (2), preferably at least one dimming device is provided, with which an illuminance and / or a light color of the light emitted by the at least one indirect light source (41), preferably continuously and / or independently of an adjustability of the first illuminance (44) of the diffuse light (4) and / or the second illuminance (45) of the at least one directed light beam (6 ), is adjustable. Lighting device (1) according to one of the Claims 1 to 6 , an on / off switch (9) being provided. Lighting device (1) after Claim 7 , wherein the at least one dimming element (7) and / or the at least one dimming device (8) and / or the on / off switch (9) are integrated in an operating element (10). Lighting device (1) according to one of the Claims 1 to 8th At least one sensor (11) is provided, with which a brightness on the work surface (2) can be measured and / or a person working on the work surface (2) can be detected, preferably the at least one sensor (11) via a switch can be activated and deactivated, particularly preferably, when the sensor (11) is activated, the illuminance levels (44, 45) of the at least one diffuse light source (3), the at least one directional light source (5) and / or an indirect light source (41) which may be provided ) can be regulated and / or controlled automatically by means of at least one control and / or regulating unit (13) such that the brightness measured by the at least one sensor (11) remains constant. Lighting device (1) after Claim 9 At least two sensors are provided, a brightness being measurable on the work surface (2) by means of a first sensor and a person (12) working on the work surface (2) being detectable by means of a second sensor. Lighting device (1) according to one of the Claims 1 to 10th , At least one control and / or regulating unit (13) for controlling and / or regulating the light sources (3, 5, 41) is provided. Lighting device (1) after Claim 11 , wherein the at least one control and / or regulating unit (13) has at least one communication interface for, preferably wireless, communication with at least one mobile processor-controlled terminal, preferably a cell phone. Lighting device (1) according to one of the Claims 1 to 12th , wherein the at least one directed light source (5) has at least one bundle element (14), preferably wherein the at least one bundle element (14) is a reflector or a lens. Lighting device (1) according to one of the Claims 1 to 13 The at least one diffuse light source (3) has at least one diffuser (15) and / or at least one microprism (23). Lighting device (1) according to one of the Claims 1 to 14 , The at least one diffuse light source (3) being essentially flat. Lighting device (1) after Claim 15 , wherein the lighting device (1) has a radiation surface (20) pointing in the direction of the working surface (2), the at least one diffuse light source (3) being more than 50%, preferably more than 75%, particularly preferably more than 90% Radiation area (20) occupies. Lighting device (1) according to one of the Claims 1 to 16 The at least one diffuse light source (3) and the at least one directional light source (5) are arranged in a common housing (19). Lighting device (1) according to one of the Claims 1 to 17th , wherein the at least one directed light source (5) is arranged in a recess. Lighting device (1) according to one of the Claims 1 to 18th , wherein the lighting device (1) is designed as a floor lamp or pendant lamp.

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