DE102020119540B4 - Lamp with disinfection function - Google Patents

Abstract

Lamp (1) with at least one lamp housing (2) and at least one lamp (8, 9; 38) for visible light, wherein the lamp (1; 35) has a dual function with a lighting function and a disinfection function, in that the at least one lamp housing (2 ) has at least one integrated air duct (12) and/or air duct (12) formed by housing wall parts and/or by add-on parts and the light (1; 35) can be attached in a lounge for people, the at least one air duct (12) has at least one intake - duct area (13) with at least one inflow opening (14) for sucking in air from the recreation room, and at least one outflow duct area (23) with at least one outflow opening (24) for the discharge of conveyed air into the recreation room, wherein at least one air conveying device (15) is arranged in the air duct (12) between the at least one intake duct region (13) and the at least one outflow duct region (23). at least one irradiation channel area (17) is formed in the at least one air channel (12) upstream of the at least one air conveying device (15) and/or downstream of the at least one air conveying device (15), in which one or more UV sources ( 18, 19; 46) for the irradiation and UV disinfection of an air stream flowing past (arrows 21; 45), and at least one radiation protection device and reflection barrier is provided, in that the air duct is light-tight in the UV range, in particular in the UV-C range, at least in the direction of the recreation room and is formed by the geometric design of the air duct to prevent UV radiation from escaping from the at least one inflow opening (14) and/or the at least one outflow opening (24) of the at least one air duct (12).characterized in that the The light is a pendant light (1) which can be hung or mounted on a ceiling of the recreation room (26), that the at least one light source for visible light is arranged on or in the at least one light housing (2) in such a way that visible light can be emitted, wherein when the at least one lamp (18, 19) is arranged in the interior of the at least one lamp housing (2nd ) light exit openings are provided, and that the at least one intake channel area (13) with the at least one inflow opening (14) for sucking in air is directed downwards and the at least one outflow channel area (23) with the at least one outflow - opening (24) directed upwards for blowing air upwards and/or to the side for blowing air to the side.

Description

The invention relates to a lamp according to the preamble of claim 1.

Luminaires are generally known in a large number of embodiments for different uses. Illuminants that can be operated electrically and that can be switched on and off and whose brightness can optionally be controlled are arranged in or on luminaires, with a large number of different and differently designed illuminants, for example incandescent lamps, halogen lamps, LEDs (light emitting diodes), etc. being generally known. In addition to floor lamps, table lamps, work lamps, hand lamps, etc., pendant lights suspended from a ceiling and ceiling lights attached to the ceiling are also generally known as work lights in people's lounges, for example, above meeting tables in offices, above reception counters in doctor's surgeries or banks or administration offices , etc. may be appropriate.

In addition, UV light disinfection of air to inactivate germs contained in the air, such as viruses, bacteria, fungi, etc., in hospitals or for clean rooms in the manufacturing industry is generally known. For this purpose, an air flow in an air duct of the building installation is guided past one or more UV sources that generate ultraviolet radiation by means of an air conveying device and is then directed into one or more rooms. In particular, such devices can be part of ventilation systems. The known systems of building installation are too complex and unsuitable for an individually set up UV light disinfection of air in small-scale areas, such as in offices or living areas. Furthermore, such known systems are perceived as annoying due to optical aspects, the noise development and the strong air movement due to small intake surfaces.

UV disinfection devices attached to hospital beds are also known ( EP 2 454 532 B1 ). Aluminum linings in housings containing UV sources are also known ( DE 10 2018 125 596 A1 ), as well as an optical labyrinth of lamellae to shield UV radiation ( DE 690 11 854 T2 ).

A generic lamp with the features of the preamble of claim 1 is made US 2020/0009286 A1 known. The air inlet and the air outlet are close together on the underside of the lamp, which can result in an unfavorable flow short circuit, which hinders an advantageous large-scale circulation.

Next is over U.S. 2017/0321877 A1 a similarly constructed lamp is known as a wall lamp, the air outlet of which on a wall only leads to a small-scale circulation.

Out of US 2013/0094204 A1 is a tube light for a thermal air flow without UV disinfection and off CN 108131616A a fan arrangement is known.

The object of the invention is to improve a generic lamp with regard to an air flow.

This object is achieved with the features of claim 1. Preferred configurations are the subject matter of the dependent claims.

According to claim 1, the lamp is a pendant lamp that can be hung or mounted on a ceiling of the lounge, the at least one lamp for visible light being arranged on or in the at least one lamp housing in such a way that visible light can be emitted, with an arrangement of the at least a lamp in the interior of the at least one lamp housing light exit openings are provided. The at least one intake duct area with the at least one inflow opening (14) for sucking in air is directed downwards and the at least one outflow duct area with the at least one outflow opening is directed upwards for blowing out air upwards and/or directed to the side for blowing air to the side.

In an air process with active, large-scale circulating air movement, an inactivation of germs contained in the air, in particular viruses and bacteria, can advantageously be carried out here with a compact functional unit as a pendant luminaire in a lounge for people, in particular while people can stay there. The double function of the lamp with a lighting function and an integrated disinfection function is particularly effective, since lamps, for example to illuminate a workplace, are regularly set up or attached in the immediate vicinity of people and it is precisely there that the disinfection function can be used to protect people from hazards. If necessary, people can be surrounded by irradiated air and stay in disinfected air like in an air bell, or a kind of air curtain with irradiated air can be set up to separate common room areas from each other.

Specifically, in one embodiment, the at least one air conveying device, in particular as a fan, a radiation protection device and reflection barrier, the one or more UV sources and the at least one outflow opening can be arranged in succession in the air flow direction in the air duct, with the fan being at the bottom and blowing air through the radiation duct area .

In an alternative embodiment, a radiation protection device and reflection barrier, the at least one UV source, another radiation protection device and reflection barrier, the at least one air conveying device, in particular as a fan, and the at least one outflow opening can be arranged in succession in the air flow direction in the air duct, with the fan lies on top and sucks.

The short-wave "invisible" UV radiation, especially UV-C radiation, is harmful to the skin and eyes when exposed to direct radiation. In both of the above embodiments, therefore, the UV radiation in a recreation room is shielded, in particular downwards.

Air conveying devices as fans are available on the market made of plastic or at least with plastic components. As is known, the service life of such fans is greatly reduced in the case of UV radiation, in particular in the case of UV-C radiation. In the above two embodiments, the air conveying device is therefore shielded from UV radiation, in particular in the case of fans.

Optionally, the at least one radiation protection device and reflection barrier can also be arranged in front of the at least one outflow opening in the first embodiment above, but can also be omitted if the UV radiation is only directed against the ceiling and not into the living room.

The radiation protection device and reflection barrier can be formed by shielding elements as built-in parts in the air duct and/or by deflections of the air duct, for example such that a lamellar structure is arranged either as a built-in part or as an integral solution in the air duct. Such a lamellar structure with one or more lamellae offers a low flow resistance and, with a suitable arrangement, for example inclined position, angling, etc., can form a reliable and effective reflection barrier.

To support the process, an advantageous air circulation can be configured as an air roll in a circulation function, in that sucked air is circulated through the air conveying device and the air movement and/or through thermal effects via heating, in particular through the waste heat of the at least one illuminant and/or the UV radiation source and /or the electrical supply unit and/or flows away from the top of the lamp through a heating element, then cools down and sinks and is sucked in again. People tend to stay in the middle of the room, so that the air currents flow along the ceiling wall and flow down or sink along the side wall areas. If suction is then taken from about the center of the room, an advantageous, preferred circulation flow is created.

Known UV LEDs and/or gas discharge lamps, in particular low-pressure mercury vapor lamps, can be arranged in the air duct as one or more UV sources. The UV sources should generate short-wave UV radiation in the wavelength range from 200 nm to 280 nm, in particular for a particularly effective inactivation of viruses and bacteria contained in the air as UV-C radiation with a wavelength of 250 nm to 280 nm. At these wavelengths and corresponding radiation intensity, the viruses contained in the air in the form of aerosols in particular are inactivated in a known manner, which means that the lamp according to the invention can be used to a particular extent for inactivating Covid-19 corona viruses and influenza viruses. In any case, for an advantageously ozone-free room, lamps should be used that do not have a radiation component below 200 nm in order to avoid the generation of ozone, which can lead to irritation of the respiratory tract in people present.

The electrical power supply of the at least one light source for the lighting function and the electrical power supply of the at least one air conveying device and the at least one UV source for the disinfection function can be switched on and off in a jointly coupled manner. Depending on the embodiment and configuration, however, the two functions can also be switched on and off separately and optionally controlled separately with regard to the brightness for the lighting function and with regard to the air flow rate with an adjusted UV output for the disinfection function.

Since the non-visible radiation from one or more UV sources cannot be seen from outside the light, particularly through the radiation protection device, and the air is only disinfected if the UV sources are operating properly, an optical and/or acoustic warning device is used to monitor the function of the one or more UV sources by monitoring their operating energy supply and/or whose generated UV radiation is monitored with a UV sensor.

As an alternative or in addition, the temperature of the inflowing and outflowing air can be measured and fed to an evaluation device, in which the values are compared, for function monitoring. If the temperature difference falls below a certain level, it is concluded that the at least one UV source is in an improper state and a warning signal is emitted, for example.

According to the invention, the lamp is designed as a pendant lamp that can be hung on a ceiling of the recreation room. The at least one light source for visible light should be formed here in particular by a number of LED light points (light emitting diode light points) and/or by at least one LED strip which is arranged on or in at least one light housing in such a way that visible light in particular can be radiated below and, if necessary, also upwards to the ceiling. If the at least one illuminant for visible light is arranged in the interior of the at least one lamp housing, light exit openings are to be provided, which can optionally be covered with a translucent cover. The at least one intake channel area with the at least one inflow opening should be directed downwards from below for the intake of air.

When arranged horizontally, the pendant luminaire according to the invention can have an elongated, in particular cuboid, or ring-shaped or disc-shaped shape and contain light channels on both sides of at least one intake channel area directed downwards, with illuminants radiating downwards, in particular with LED strips radiating downwards. In a compact arrangement, UV LEDs or mercury vapor lamps can also be attached as UV sources on an inner wall, preferably on an upper wall, of the at least one light channel. Alternatively, the sequence of the channels can also be different, for example by means of a central light channel and an intake channel area to the left and/or right of it.

In a further embodiment not according to the invention, the lamp is designed as a tube lamp, in particular for suspension with a vertical tube axis. The lamp housing of the tubular lamp has a tubular, cylindrical, for example rectangular, for example square, or circular-cylindrical tubular housing in which the disinfection function is implemented. The cylinder housing, in particular in the lower area, encompasses a light ring channel which is open at the bottom and in which at least one lighting means which radiates downwards for the emission of visible light for the lighting function is fitted.

In a specific embodiment of a tube light that is not according to the invention, the intake channel area is formed in the lower end area of the cylinder housing, in which an axial fan adapted to the cylinder cross section is arranged. A cone element with a smaller diameter is arranged centrally above the axial fan as an air guide and UV shielding element and with the cone nozzle directed towards the axial fan. At the transition to the irradiation channel area, a ring element narrowing the air channel to bundle the flow and having an inclined air-guiding surface is arranged above the cone element as an air-guiding and UV-shielding element. At least one UV source, in particular as at least one UV lamp, is mounted on the conical element as a carrier part, projecting through the ring element into the irradiation channel area that widens toward the inner diameter of the tube. The outflow channel area is formed in the upper end area of the tube housing, with a cone element and a ring element being attached at the transition from the radiation channel area to the outflow channel area as air guiding and UV shielding elements, in accordance with the arrangement in the lower end area of the cylinder housing. Alternatively, the cone and ring elements can be replaced by a lamellar structure made up of several lamellae as UV shielding elements and air guiding elements. Here it is then preferably provided that the intake duct area is formed in the lower end area of the tubular housing, in which an axial fan adapted to the cylinder cross-section is arranged, with a first lamellar structure with at least one lamella being placed above the axial fan as an air-guiding and UV-shielding element. preferably with several slats. In the area of the first lamella structure or above the first lamella structure, at the transition to the irradiation channel area, there is a socket holder, which preferably forms an additional air guiding and UV shielding element, on which at least one UV source protruding into the irradiation channel area, in particular at least a UV-C lamp, is attached. It is further provided that the outflow channel area is formed in the upper end area of the tubular housing and that at the transition from the irradiation channel area to the outflow channel area a second lamellar structure with at least one lamella, preferably with several lamellas, is provided as air guiding and UV shielding elements, in accordance with Arrangement is mounted in the lower end of the tubular housing.

In a further alternative, the upper UV shield may be omitted as the Here, UV radiation is directed upwards towards the ceiling and not towards people in a lounge.

In a further alternative embodiment, the fan can be arranged above the upper UV shield, in which case the upper UV shield then also serves in particular to protect the fan from harmful UV radiation.

The light function and an effective disinfection function with active air movement are also integrated in the tube light with a relatively simple and inexpensive structure.

The inventive provision of the largest possible intake and outflow surfaces disturbing air movements and noise are avoided. This can be further supported by the at least one inflow opening on the at least one intake duct area and/or the at least one outflow opening on the at least one outflow duct area for a diffuse inflow and/or diffuse outflow with a cover with a large number of Flow-through openings is covered. In addition, the covers, with their large number of through-flow openings, can be designed for an attractive design or can be formed by open-pore foam part covers.

The covers can have a lattice structure or a perforation structure in the manner of a perforated diaphragm.

In principle, a large number of known air conveying devices are available for use on a lamp according to the invention. According to the invention, axial fans and/or cross-flow fans and/or radial fans that can be driven in an electrically controlled manner can be used in a particularly simple, cost-effective and energy-saving manner, which can optionally be arranged offset from one another at several points in the at least one air duct.

Furthermore, a method for illuminating a recreation room for people and for disinfecting air in the recreation room with UV radiation while people can be in the recreation room can be carried out using a lamp according to one of claims 1 to 19.

Exemplary embodiments of the invention are explained in more detail with reference to a drawing.

• 1 zeigt eine perspektivische Darstellung einer Pendelleuchte in einer Teilansicht mit einem Querschnitt,
• 2 eine schematische Darstellung einer Leuchtenanordnung,
• 3 einen Längsschnitt durch eine nicht erfindungsgemäße Rohrleuchte, und
• 4 eine Teilansicht entsprechend 3 mit einer alternativen Anordnung von Luftleit- und UV-Abschirmelementen.

Show it:

• 1 shows a perspective view of a pendant light in a partial view with a cross section,
• 2 a schematic representation of a lighting arrangement,
• 3 a longitudinal section through a tube lamp not according to the invention, and
• 4 a partial view accordingly 3 with an alternative arrangement of air guide and UV shielding elements.

In 1 a pendant light 1 (without suspension device) suspended from a ceiling of a recreation room is shown schematically in a perspective view obliquely from below. The pendant lamp 1 has an annular lamp housing 2, part of which has been cut off, so that a cross section 3 through the lamp housing 2 is visible.

The pendant lamp 1 has a double function with a lighting function and a disinfection function.

For the lighting function, the lamp housing 2 has a downwardly open light channel 4, 5 on the inner ring side and on the outer ring side, each with an upper wall 6 and upper wall 7, the underside of which has LED strips 8, 9 running around in the lamp housing 2 as downwards radiating lamps are attached. The undersides of the light channels 4, 5 are covered all around with light-transmissive, transparent and/or perforated covers 10, 11.

For the integrated disinfection function, an air duct 12 is formed around the circumference of the light housing with a lower intake duct area 13 between the light ducts 4, 5 with inflow openings 14 on a grid-shaped lower cover of the intake duct area 13.

In the intake duct area 13, an electrically operable axial fan 15 is shown here with a vertical axis, which sucks in air from below in accordance with the illustrated air inflow arrows 16 for an air flow through the air duct 12. Along the ring-shaped luminaire housing 2, several axial fans 15 are offset in relation to one another circumferential intake channel area 13 is arranged.

After the intake channel area 13, the air channel 12 widens over the upper walls 6, 7 of the light channels 4, 5 to form an irradiation channel area 17, with UV-C LEDs 18, 19 running around as UV sources on the upper walls 6, 7 are attached. In addition, an air guiding element 20 is arranged above the axial fan 15 as an arcuate thin plate part, with which, as shown by the arrows 21, a flow guide for the bundled air bypass at the UV-C LEDs 18, 19 is achieved becomes. In addition, the air guiding element 20 shields UV radiation from escaping from the air duct 12 .

In the upper central area, the irradiation channel area 17 narrows to form an air gap 22, which is adjoined with a large outflow widening by an outflow channel area 23 with a wide, circumferential outflow opening 24, through which, as shown by the arrows 25, irradiated and thus disinfected air is blown out towards the ceiling.

The pendant lamp 1 can be ring-shaped as in cross section 3 or possibly have individual corresponding segments in the lamp housing ring 2 for the lighting function and/or disinfection function, all of which can be controlled together or possibly also individually.

In the schematic representation 2 For example, an elongated, cuboid pendant lamp 1 is mounted in an office 26 above a conference table 27 at which two people 28 are sitting. The pendant light 1 also includes the disinfection function as in 1 shown.

It can be seen that air is blown out of the pendant light 1 upwards and flows away from the pendant light under the ceiling 29 of the office space 26 as possibly heated and disinfected air (arrow 30). The air also sinks down the sides of the room due to cooling and, as disinfected air, reaches the head area of the persons 28 in a circulation process as air cylinder 31 and air cylinder 32 for partial inhalation and subsequent exhalation in the inflow (arrows 33, 34) from below to the pendant light 1

In 3 is shown as a further non-inventive embodiment, a lamp as a tube lamp 35 for a suspension with a vertical tube axis in longitudinal section. The lamp housing has a tubular, circular-cylindrical cylinder housing 36 here, merely as an example, in which the disinfection function is implemented.

At the bottom, the cylinder housing encloses a light ring channel 37 which is open at the bottom and in which at least one illuminant for emitting visible light (here an LED strip 38) is mounted.

In the lower end area of the cylinder housing 36 the intake channel area 13 is formed, in which an axial fan 15 adapted to the cylinder diameter is arranged. A cone element 39 with a smaller diameter is arranged centrally above the axial fan 15 as an air guiding and UV shielding element and with the cone tip 40 directed towards the axial fan 15 . A cover grille under the axial fan has been left out for better clarity.

At the transition to the irradiation channel area 17, a ring element 41 narrowing the air channel to bundle the flow and having an inclined air-guiding surface is arranged above the cone element as an air-guiding and UV-shielding element. At least one vertically oriented UV-C lamp 46, here as a double lamp, is arranged on the cone element 39 as a carrier part and protrudes through the ring element 41 into the irradiation channel area 17 that widens to the inside diameter of the cylinder. The outflow channel area 23 is formed in the upper end area of the cylinder housing 36, with a conical element 43 again being attached at the transition from the irradiation channel area 17 to the outflow channel area 23 as air guiding and UV shielding elements, corresponding to the arrangement in the lower end area of the cylinder housing 36 are.

In 4 only a modified partial area from the axial fan 15 to the outflow channel area 23 of the otherwise identical tubular light 35 not according to the invention is shown. Instead of the cone elements 40, 43 and the associated ring elements 41, 44, lamellar diaphragms or lamellar structures 47, 48 made of one or preferably several lamellae are used as air guiding and UV shielding elements, with the socket holder 49 of the UV-C lamp 46 den Radiation protection forms downwards.

Here too, as shown by the flow arrows 45, air is sucked in from below, disinfected in the irradiation channel area 17 and blown out upwards.

In the 3 and 4 Alternatively, instead of the arrangement shown, the axial fan 15 or optionally another axial fan can be arranged in the outflow channel area 23 above the ring element 44 or the lamellar structure 48 .

Reference List

1

pendant light

2

lamp housing

3

cross-section

4

light channel

5

light channel

6

top wall

7

top wall

8th

LED strips

9

LED strips

10

cover

11

cover

12

air duct

13

intake port area

14

inflow openings

15

axial fan

16

Air Inflow Arrows

17

Irradiation channel area

18

UV-C LED

19

UV-C LED

20

air deflector

21

Arrow

22

air gap

23

outflow channel area

24

outflow opening

25

Arrow

26

office space

27

meeting table

28

persons

29

ceiling

30

arrows

31

left air roll

32

right air roll

33

arrows

34

arrows

35

tube lamp

36

tubular housing

37

light ring channel

38

LED tape

39

cone element

40

cone tip

41

ring element

42

airfoil

43

cone element

44

ring element

45

flow arrows

46

UV-C lamp

47

lamellar structure

48

lamellar structure

49

frame holder

Claims (17)

Lamp (1) with at least one lamp housing (2) and at least one lamp (8, 9; 38) for visible light, the lamp (1; 35) having a dual function with a lighting function and a disinfection function, in that the at least one lamp housing ( 2) has at least one integrated air duct (12) and/or air duct (12) formed by housing wall parts and/or by add-on parts and the lamp (1; 35) can be attached in a lounge for people, the at least one air duct (12) having at least one has an intake duct area (13) with at least one inflow opening (14) for sucking in air from the recreation room, and at least one outflow duct area (23) with at least one outflow opening (24) for the discharge of conveyed air into the recreation room, at least one air conveying device (15) being arranged in the air duct (12) between the at least one intake duct region (13) and the at least one outflow duct region (23). t, at least one irradiation channel region (17) is formed in the at least one air duct (12) upstream of the at least one air conveying device (15) and/or downstream of the at least one air conveying device (15), in which one or more UV sources (18, 19; 46) for the irradiation and UV disinfection of an air flow flowing past (arrows 21; 45), and at least one radiation protection device and reflection barrier is provided, in that the air duct is light-tight in the UV range, in particular in the UV-C range, at least in the direction of the lounge and is formed by the geometric design of the air duct to prevent UV radiation from escaping from the at least one inflow opening (14) and/or the at least one outflow opening (24) of the at least one air duct (12). characterized in that the lamp is a pendant lamp (1) which can be hung or mounted on a ceiling of the recreation room (26), that the at least one illuminant for visible light is arranged on or in at least one lamp housing (2) in such a way that visible Light can be emitted, with an arrangement of the at least one light source (18, 19) in the interior of the at least one lamp housing (2) light exit openings are provided, and that the at least one intake channel area (13) with the at least one inflow opening (14) is directed downwards for sucking in air and the at least one outflow channel area (23) with the at least one outflow opening (24) directed upwards for blowing air upwards and/or to the side for blowing air sideways. Shine after claim 1 , characterized in that in the air flow direction in the air duct the at least one air conveying device as a fan (15), the radiation protection device (20; 39, 41) and reflection barrier, the one or more UV sources (18, 19; 46) and the at least one Outflow opening (24) are arranged. Shine after claim 1 , characterized in that a radiation protection device and reflection barrier, the at least one UV source, another radiation protection device and reflection barrier, the at least one air conveying device as a fan, and the at least one outflow opening are arranged in succession in the air flow direction in the air duct. Shine on one of the Claims 1 until 3 , characterized in that at least one radiation protection device (20; 43, 44) and reflection barrier is arranged in front of the at least one outflow opening. Shine on one of the Claims 1 until 4 , characterized in that the radiation protection device and reflection barrier is formed by the geometric design of the air duct such that shielding elements (20; 39, 41, 43, 44) are built into the air duct as built-in parts and/or the air duct has deflections. Shine on one of the Claims 1 until 5 , characterized in that the radiation protection device and reflection barrier is formed from a lamellar structure with one or more lamellae, which is arranged as a built-in part and/or as an integral structure in the air duct. Shine on one of the Claims 1 until 6 , characterized in that after air has been sucked in by the air conveying device (15), air movement and/or heating of the air by the waste heat of the at least one illuminant and/or the at least one UV source and/or the electrical supply unit and/or takes place through at least one heating element, whereby the air flows away from the top of the lamp (1; 35) after the outflow channel area (23) due to the air conveyance and/or thermal effects, then cools down and flows downwards until it is sucked in again, so that in one or more air cylinders (31, 32) are formed with a circulation function. Shine on one of the Claims 1 until 7 , characterized in that the one or more UV sources (18, 19; 35) generate a short-wave UV radiation as UV-C radiation with a wavelength of 250 nm to 280 nm. Shine on one of the Claims 1 until 8th , characterized in that UV tubes are arranged as one or more UV sources as gas discharge lamps (35), in particular as low-pressure mercury vapor lamps in the air duct. Shine on one of the Claims 1 until 8th , characterized in that UV LEDs (18, 19) are arranged as one or more UV sources. Shine on one of the Claims 1 until 10 , characterized in that an electrical power supply for the at least one lamp (18, 19; 35) for the lighting function and an electrical power supply for the at least one air conveying device (15) and the at least one UV source (18, 19; 46) for the disinfection function are coupled together or separately controllable and/or switchable. Shine on one of the Claims 1 until 11 , characterized in that an optical and / or acoustic warning device for monitoring the function of one or more UV sources is provided with a monitoring of the energy supply and / or monitoring of the UV radiation generated with a UV sensor, and / or that the warning device has a differential temperature measuring device, with which the temperature of the inflowing air and the higher temperature of the outflowing air due to waste heat from the functioning UV source are measured and that a malfunction of the UV source is detected at an adjustable, low differential temperature. Shine on one of the Claims 1 until 12 , characterized in that the at least one light source for visible light is arranged as a plurality of LED light points and/or as at least one LED strip (18, 19) on or in at least one light housing (2) in such a way that visible light shines downwards and can optionally also be radiated upwards to the ceiling, with an arrangement of the at least one lamp (18, 19) in the interior of the at least one lamp housing (2) light exit openings are provided, which are covered with a translucent cover (10). Shine after Claim 13 , characterized in that the lamp as a pendant lamp (1) for a horizontal arrangement has an elongated and / or ring-shaped and / or disc-shaped shape and one-sided or at least one light channel (5) with lamps emitting downwards, in particular with LED strips (8, 9) emitting downwards, for visible light is arranged on both sides of at least one intake channel area (13) directed downwards, and that on an inner surface of the at least one light channel (5) UV LEDs are arranged as UV sources (18, 19). Shine on one of the Claims 1 until 14 , characterized in that the at least one inflow opening (14) on the at least one intake channel area (13) and/or the at least one outflow opening on the at least one outflow channel area for diffuse inflow and/or diffuse outflow, each with a Cover are covered with a variety of flow-through openings or by open-pore foam part covers. Shine after claim 15 , characterized in that the cover of the at least one inflow opening and/or the cover of the at least one outflow opening has a lattice structure, in particular as a perforation structure in the manner of a pinhole diaphragm, in order to implement a multiplicity of small throughflow openings. Shine on one of the Claims 1 until 16 , characterized in that the at least one air conveying device has one or more axial fans (15) and/or cross-flow fans and/or radial fans which can be driven in an electrically controlled manner and which are optionally arranged offset to one another in the air duct.

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