DE102012006887A1 - Light fixture for use as pendant lamp or deck mounted lamp, has frame-like flat profile housing symmetric to longitudinal axis and having two opposite longituidinal profiles - Google Patents

Abstract

The light fixture has a frame-like flat profile housing (1) symmetric to the longitudinal axis (A) and having two opposite longituidinal profiles (11a,11b), where a light outlet field is limited on a lower side. The central secondary reflector is arranged in the light scattering inner space almost in the area of the longitudinal axis such that a portion of the light laterally irradiated by the light unit (2) over the symmetric primary reflectors is deflected in direction on the light outlet field for the direct light portion on the lower side.

Description

The invention relates to a lamp with a symmetrical to a longitudinal axis, frame-shaped flat profile housing with two opposite longitudinal profiles, whereby a light emission field is limited to a bottom for emitting a direct light component and a light exit panel on a top for emitting a Indirektlichtanteils.

A lamp of this kind is from the DE 103 35 748 A1 known. This has for the purpose of light reflectors, which are associated with the bulbs and radiate emitted light predominantly upwards. In this case, a reflector extends from below the at least one luminous means inclined at an angle obliquely upward and the luminaire center to next to the at least one light source. As a result, the majority of the light emitted by the lamp is radiated upward to the ceiling. A luminaire of this type thus has a high Indirektlichtanteil and a correspondingly reduced direct light component. In order to obtain a noticeable direct light component, such a luminaire must be equipped with powerful light sources.

Luminaires of this kind can z. B. be used as pendant lights or deck mounted luminaire. These should be as glare-free a downward direct light z. B. to illuminate a workplace. In addition, it is desirable to derive indirect light components in other spatial directions. These are used as scattered light components for the diffuse illumination of surrounding areas of space, such. As of ceilings, walls, construction parts, trusses, wooden beams, stairs, u. v. m .. Such diffuse ambient irradiation has the advantage that strong lighting contrasts z. B. be avoided between a desk surface and a surrounding office space. This can also be a work space surrounding z. B. a spanning ceiling, weakly lit with an at least diffuse scattered light and thus the depth of space can be made visible. In addition, the visual conditions z. B. in closets and shelves improved.

In order to obtain a larger proportion of direct light in a lamp of this type is in the DE 20 2009 014 258 U1 proposed that the central region of the lamp housing is covered on the upper side at least partially by an opaque cover. This embodiment has the disadvantage that covers are placed on the outside of the lamp housing on the light exit opening and thus this no longer has a compact, easy-to-clean shape. In addition, the homogeneity of both the downwardly radiated direct light component and the upward outgoing indirect light component can be impaired by simple, plate-shaped covers.

Another lamp of this kind is from the DE 20 2009 010 018 U1 known. This has to increase the direct, downwardly radiated light component a beam splitter disc with an approximately in the middle along the longitudinal axis parallel to the light units extending longitudinal zone with increased reflectivity at reduced light transmission and on both sides to each a longitudinal zone with reduced reflectivity with increased light transmission.

The invention is based on the object to provide a further improved luminaire, which has a relative to the Indirektlichtanteil increased direct light component.

The object of the invention is achieved with the characterizing features of claim 1 lamp. Advantageous further embodiments of the invention are specified in the subclaims.

According to the invention, in each case one light unit with a primary reflector lying symmetrically to the transverse axis of the flat profile light is arranged in the longitudinal profiles such that it is in a light scattering interior between the longitudinal profiles, the light exit field for the direct light portion at the bottom and the light exit field for the indirect light portion Beam in laterally at the top.

This ensures that the light units uniformly radiate light from both sides along the transverse axis into the light scattering interior.

This source of light fluxes thus still have no, especially directed to a light exit field on the top or bottom of the flat profile housing light components.

According to the invention, furthermore, a central secondary reflector in the light scattering interior in the region of the longitudinal axis in the light exit field for the indirect light component is arranged on the upper side in such a way that part of the light irradiated laterally by the light units and symmetrical primary reflectors is deflected in the direction of the light exit field for the direct light component on the lower side.

Hereby, a division of the laterally irradiated luminous fluxes into a direct and an indirect component is now possible inside the luminaire. Particularly advantageous, in particular depending on the size of the central secondary reflector, a targeted redistribution of indirect light components in direct light and thus a u. U. strong increase of the direct light component can be effected. According to the invention this is effected by means of the central secondary reflector in a particularly glare-free and effective manner. Depending on the design, bulbs which have a reduced electrical power consumption can thus also be used without any loss of illuminance in the direct light component. Thus, instead of conventional 80 W fluorescent lamps, lamps with a reduced electrical output of 49 W or 35 W can also be used. In addition, the distribution of the lateral source luminous fluxes in the direct and indirect light component can be adjusted by the use of a secondary reflector with a selected size depending on the application of the flat profile luminaire and the illuminance levels in the direct and indirect direction z. B. be matched to different mounting and room heights.

Due to these advantageous properties, other bulbs can also be used, in particular elongated bulbs in the form of band-like or chain-shaped light-emitting diodes.

The luminaire according to the invention can also be free-hanging, for example, without impairing its advantageous properties. B. as a pendant light, as well as freestanding, z. B. as a floor lamp, executed. Also a direct mounting on a surface, z. B. as a ceiling mounted luminaire, or in a suspended ceiling, z. B. as a recessed light, are possible.

The invention and advantageous embodiments thereof will be explained in more detail with reference to the figures briefly mentioned below. Show

1 a top view of an exemplary flat profile lamp according to the invention,

2 4 shows a lateral section through a preferred exemplary embodiment of the flat profiled luminaire according to the invention with exemplary beam paths for illustrating the principle of irradiation, distribution, scattering and decoupling of light components,

3 a side detail D through the flat profile of 2 in the area of the upper beam splitter disk with exemplary beam paths for illustrating the irradiation, distribution, scattering and decoupling of light components,

4 a side detail C through the flat profile of 2 in the area of the lower diffuser disk with exemplary beam paths for illustrating the irradiation, distribution, scattering and decoupling of light components,

5 a detail in plan view of the underside at one end of the flat profile light,

6 a detail in plan view of the top at one end of the flat profile light,

7 a lateral section through another preferred embodiment of the flat profile lamp according to the invention with light emitting diode strips, also called LED stripes, as elongated lamps, and

8th a lateral section through another preferred embodiment of the flat profile lamp according to the invention with chain-like arranged, freely radiating LED strips as elongated light sources.

1 shows a plan view of an advantageous embodiment of a flat profile lamp according to the invention, and 2 a corresponding lateral cross-sectional view along a section line B.

The lamp has a frame-shaped flat profile housing 1 from a first and second longitudinal profile 11a . 11b on, which are arranged opposite and preferably designed U-shaped. The front sides of the flat profile housing 1 are over a first and second U-shaped cross section 12a . 12b closed, which preferably one with the longitudinal profiles 11a . 11b have identical cross-sectional shape and matching dimensions. The longitudinal and transverse profiles are preferably connected at the corners of the housing via mitres. The housing is symmetrical with respect to a longitudinal axis A and bounded on an upper side 13a a light exit field 16a and at a bottom 13b a light exit field 16b , How special from the cross-sectional view of 2 is apparent, are a first, second light unit 2 . 3 lying in the preferred U-shaped longitudinal profiles 11a . 11b inserted and radiate substantially laterally in one of the frame-shaped flat profile housing 1 limited light scattering interior 15 one.

According to a particularly advantageous and in the 1 to 6 already shown embodiment are in the light exit field 16a at the top 13a a beam splitter disk 40 and in the light exit field 16b on the bottom 13b a long prismatic refraction disc 50 inserted. This is referred to below as a diffuser disk. When using the lamp z. B. as a pendant light is through the light exit field 16a at the top 13a and the preferred located there beam splitter disc 40 an indirect light component 6 decoupled upwards, the z. B. is directed to a ceiling. Furthermore, by the light exit field 16b on the bottom 13b and the diffuser disk preferably located there 50 a direct light component 7 decoupled down, the z. B. is directed to a work surface.

An advantageous embodiment for a beam splitter disc 40 is in 1 in a plan view of the entire lamp, in 2 in a lateral section and in 6 shown in a plan view of a cutout at one end flat profile light. The beam splitter disk 40 is preferably at a light scattering interior 15 facing inside 42 provided with a partially transparent reflection surface. It is located in the middle in the region of the longitudinal axis A of the lamp a wide longitudinal zone 43c with increased reflectivity and reduced light transmission. This contributes especially to the extraction of a downward direct light component of the luminaire. Symmetrically on both sides of the central longitudinal zone 43c close longitudinal zones 43b with reduced reflectivity and increased light transmission. These contribute particularly to the extraction of an upward indirect light component of the luminaire. Finally, at the edge zones of the beam splitter 40 two more, the longitudinal axis A symmetrical longitudinal zones 43a with again increased reflectivity and reduced light transmission. These areas on the long disc edges form an optical transition to the adjacent, opaque longitudinal profiles 11a . 11b ,

For generating the light zones 43a . 43b . 43c is the beam splitter disk 40 advantageous with a stripe pattern 44 busy. Its strips may have a different density and / or line thickness. In the 1 and 6 are particularly advantageous designs for striped pattern 44 shown in detail, which exemplifies large, thick stripes 44a and small, thin strips 44b is composed. This is where the in 1 and 6 shown area across the entire surface of the beam splitter 40 away and cover it completely. This shows the stripe pattern 44 in the longitudinal zones 43c and 43a with increased reflectivity with reduced light transmission higher density and / or increased line thickness, as compared to the longitudinal zones 43b with reduced reflectivity with increased light transmission. Furthermore, the stripes 44a . 44b of the stripe pattern 44 advantageous transverse to the longitudinal axis A and thus approximately orthogonal to the light units 2 . 3 in the longitudinal profiles 11a . 11b of the flat profile housing 1 oriented. For example, on the longitudinal zones 43a large, thick stripes 44a printed in medium density. Furthermore, in the longitudinal zones adjacent to the inside 43b small, thin stripes 44b also printed in a medium density. The centrally located in the region of the axis of symmetry A longitudinal zone 43c is with an alternating pattern of large, thick stripes 44a and small, thin strips 44b printed in a high density.

As in particular from the sectional view of 2 is apparent, are according to the invention in the longitudinal profiles 11a . 11b opposite each one light unit 2 . 3 with bulbs 22 . 32 and an underlying, to a transverse axis E of the flat profile light 1 symmetrical primary reflector 81 . 82 inserted. These are arranged so that these in a Lichtstreuungsinnenraum 15 between the longitudinal profiles 11a . 11b , the light exit field 16b for the direct light component 7 on the bottom 13b and the light exit field 16a for the indirect light component 6 at the top 13a Beam in laterally. When using the lamp z. B. as a pendant light thus carried the radiation approximately horizontally and thus parallel z. B. to an underlying floor or work surface.

According to 2 have the in the longitudinal profiles 11a . 11b insert light units 2 . 3 advantageous connection means 21 . 31 for the first, second bulbs 22 . 32 on, especially ballasts and contact sockets. The lighting means advantageously have an elongated shape. Preferably, fluorescent lamps or arranged in the form of strips LEDs can be used. Furthermore, the symmetrical to a transverse axis E of the lamp and behind the bulbs 22 . 32 arranged lateral primary reflectors 81 . 82 in cross section z. B. be executed semicircular. At an in 2 shown particularly advantageous embodiment, the primary reflector 81 first and second, preferably strip-shaped and large-area reflection areas 81a . 81b on. These are arranged symmetrically to the transverse axis E of the flat profile light and a central reflection region 81c integrally connected. The opposite primary reflector 82 is structured accordingly. Preferably, the central reflection region 81c an approximately bridge-like or arcuate cross section. In this case, its curvature faces the associated light source, and its vertex is approximately on the transverse axis E.

According to the invention is to increase the direct light component 7 in the light scattering interior 15 an additional central secondary reflector 9 , This is so in the region of the longitudinal axis A in the light exit field 16a for the indirect light component 6 at the top 13a arranged that a partial luminous flux of the light units 2 . 3 and the symmetrical primary reflectors 81 . 82 laterally irradiated light in the direction of the light exit field 16b for the direct light component 7 on the bottom 13b is diverted.

At the in 2 illustrated embodiment is the central secondary reflector 9 beneficial on the inside 42 the beam splitter disk 40 along the long axis A attached. This can z. B. two additional, angled contact surfaces 92a . 92b have, and glued or screwed about it. Of these go two obliquely inclined reflection edges 91 . 91b off, which in a vertex 93 are merged. In the example of 2 the reflection edges on a flat, striped surface. In another embodiment, these may also be parabolically curved.

To achieve the desired magnification of the direct light component 7 especially contributes to that the vertex 15 of the central secondary reflector 9 in the light scattering interior 15 protrudes, ie the secondary reflector 9 has a corresponding height. So the top part 93 in the example of 2 far towards the inside 52 the diffuser disk 50 down and the light scattering interior 15 thereby in two, the respective light unit 2 . 3 facing sections 15a . 15b is shared.

The effect of the central secondary reflector 9 in cooperation with the symmetrical primary reflectors 81 . 82 behind the bulbs 22 . 32 is the example of the left section 15a of the light scattering interior 15 in 2 in partial line symbolically represented partial luminous fluxes explained below by way of example. Partial light streams of this kind occur, of course, in a corresponding manner in the right partial light range 15b on. From the sum of all partial luminous fluxes in the light scattering interior 15 Finally, the decoupled indirect and direct light components 6 and 7 together.

So in the example of the 2 the indirect light component 6 fed by a partial luminous flux 6a1 , This is from the first bulb 22 at steeper angles up towards the upper light exit field 16a and the beam splitter preferably located there 40 radiated. This partial luminous flux is in particular of the longitudinal zone 43b on top 13a passed through and constitutes a substantial part of the Indirectlichtanteils 6 represents.

In the example of 2 will continue to be the direct light component 7 by the exemplary partial luminous fluxes 7a1 . 7a2 . 7a3 and 7a4 fed. This is the partial luminous flux 7a1 from the first light source 22 also at steeper angles upwards towards the upper light exit field 16a and the beam splitter preferably located there 40 radiated. However, this partial luminous flux is from the beam splitter 40 especially over the longitudinal zones 43a and 43b down into the light scattering interior 15 reflected. This happens then the diffuser disk 50 down to the bottom 13b and contributes there to the direct light component 7 at. Also the partial light stream 7a2 contributes to this. This is from the first bulb 22 both at shallower angles upwards in the direction of the beam splitter disk 40 as well as approximately horizontally in the Lichtstreuungsinnenraum 15 reflected.

This partial light flow is over the first reflection edge 91 of the central secondary reflector 9 as a contribution to the proportion of direct light also through the diffuser disk 50 through to the bottom 13b reflected. In this case, the partial luminous flux arrives 7a2 on the one hand by reflection in particular at the longitudinal zone 43c the beam splitter disk 40 and on the other hand by direct beam path to the first reflection edge 91 , Furthermore, also carries the partial luminous flux 7a3 with the direct share at. This is from the first bulb 22 at shallow angles down towards the diffuser disk 50 radiated and of it after appropriate dispersion down to the bottom 13b pass through. Finally, the partial luminous flux also contributes 7a4 to the direct share. This is from the first bulb 22 at steeper angles down towards the diffuser disk 50 radiated and also after appropriate dispersion down to the bottom 13b pass through.

3 shows a side detail D through the flat profile of 2 in the area of the beam splitter disk 40 , Exemplary beam paths serve to illustrate the irradiation, distribution, scattering and decoupling of light fractions, in particular of the partial luminous fluxes 6a1 . 7a1 and 7a2 ,

If in these edge areas of the lower light exit field 16b at the transition to the longitudinal profiles by a partial luminous flux 7a4 In individual cases, too high luminance should occur, so it is possible due to the advantageous structure of the lamp according to the invention and with the aid of the additional central secondary reflector and optionally the advantageous beam splitter gain of the direct light component, if necessary, to reduce the light output of the lamps used. This can be z. B. can be achieved by adjustable means for dimming the lamps. On the other hand, for. As well as fluorescent tubes that have a reduced electrical power of max. 49 W or u. U. only max. 35 W are used without unreasonable restrictions on the light volume of the direct light component are to be feared.

According to a further embodiment of the invention already shown in the figures, the diffuser disk can be used for this purpose 50 also on the edges to the longitudinal profiles 11a . 11b on the light scattering interior 15 facing inside 42 additional longitudinal zones 52a . 52b having a filter-like coating. Advantageously, this can be carried out in the form of a print with a partially transparent lacquer or a spray with an incompletely covering ink. It is also the support of a partially transparent color strip by means of a digital printing method possible. By such a coating of the longitudinal zones 52a . 52b on the edge of the diffuser disk 50 becomes the illumination density of the partial luminous flux 7a4 reduced to the bottom 13b pass through.

In the 4 and 5 this is exemplified. It shows 4 a side detail C through the flat profile of 2 in the area of the lower diffuser disk 50 at the transition to the longitudinal profile 11a , Exemplary beam paths serve to illustrate the irradiation, scattering and attenuation in particular of the partial luminous flux 7a4 , Here is the inside 52 the diffuser disk 50 according to the invention in a longitudinal zone 52a provided with a filter-like coating. Their filtering effect is by a corresponding decrease in the illumination density of the partial luminous flux 7a4 on the bottom 13b in comparison to the light scattering interior 15 symbolizes.

5 shows a section of the lamp at one end in a plan view of the bottom 13b , In this case, the visible part of the light emission field 16b through the longitudinal profiles 11a . 11b and the cross profile 12a limited. In this is the diffuser disk 50 inserted according to a preferred embodiment of the invention. The filter-like coatings of the longitudinal zones 52a . 52b on the inside 52 the diffuser disk 50 are symbolized by honeycomb pattern. The structure of the outside 51 that z. B. has a plurality of parallel prisms for light scattering, is for a better overview in 5 not shown. In addition, the longitudinal zones 52a . 52b with the filter-like coating from the bottom 13b the lamp seen in practice for a person not readily noticeable.

7 shows a lateral section through a further embodiment of the lamp according to the invention. This one is with the representation of 2 comparable. In this embodiment, the first and second light units 2 . 3 with elongated light-emitting diode strips, also called LED-stripes, as third and fourth elongated light sources 23 . 33 fitted. These can be applied to a rigid or flexible support, which in turn rests on a central support area between the reflection areas of the respective primary reflector, z. B. is glued. So in the example of the 7 the light-emitting diode strip 23 placed approximately in the plane of the transverse axis E and on the between the reflection areas 81a . 81b located support area 81d of the left primary reflector 81 appropriate. Accordingly, at the opposite end of the light scattering interior 15 the light-emitting diode strip 33 on the support area located between the reflection areas 81d of the right primary reflector 82 appropriate.

8th finally shows one 7 corresponding lateral section through a further embodiment of the luminaire according to the invention. In this embodiment, the first and second light units 2 . 3 with chains of freely emitting light-emitting diode strips as the fifth or sixth elongated light source 24 . 34 fitted.

LIST OF REFERENCE NUMBERS

A

longitudinal axis

B

Section line

C

Detail in the area of the lower diffuser disk 50

D

Detail section in the area of the upper beam splitter disk 40

e

transverse axis

1

frame-shaped flat profile housing

11a, 11b

first, second U-shaped longitudinal profile

12a, 12b

first, second U-shaped cross section

13a

Top, d. H. Ceiling side, the flat profile light

16a

Light emission field on top 13a with beam splitter disc 40

13b

Bottom, d. H. Bottom side, the flat profile light

16b

Light emission field at the bottom 13b with diffuser disc 50

15

Light scattering interior

15a, 15b

first, second subarea

2, 3

first, second light unit in the longitudinal profiles 11a . 11b

21, 31

Connection means light unit, especially ballast, contact base

22, 32

first, second illuminant, esp. A fluorescent lamp

23, 33

third, fourth illuminant, esp. Rigid or flexible light emitting diode strips, also called LED strip or LED stripe

24, 34

fifth, sixth illuminant, esp. Chain of free-emitting LEDs

40

Beam splitter in the light exit field 16a on top 13a

41

outside

42

Inner side with light-reflecting surface

43a

first longitudinal zones with increased reflectivity and reduced light transmission in the area of the longitudinal profiles

43b

second longitudinal zones with reduced reflectivity and increased light transmission on both sides of the longitudinal axis A.

43c

third longitudinal zone with increased reflectivity and reduced light transmission in the region of the longitudinal axis A.

44

stripe pattern

44a

large, thick strips with full-surface coating

44b

small-area, thin strips with full-surface coating

45

strip-shaped support area for central reflector

50

long-prismatic refraction disk, called diffuser disk for short, in the light exit field 16b at the bottom 13b

51

Outside with refractive surface, z. B. Parallel prisms

52

inside

52a, 52b

Longitudinal zones with semi-transparent, filter-like coating to reduce the light density at the edges of the disc

6

indirect light component

6a1

Partial light flow of the first light source 22 at steeper angles towards beam splitter disk 40 and in particular of their longitudinal zone 43b on top 13a let through

7

direct light proportion

7a1

Partial light flow of the first light source 22 emitted at steeper angles towards beam splitter disk

7a2

Partial light flow of the first light source 22 at shallow angles towards beam splitter disk 40 and radiated horizontally

7a3

Partial light flow of the first light source 22 towards the diffuser disk 50 radiated at shallow angles

7a4

Partial light flow of the first light source 22 in the direction of the coated longitudinal zone 52b on the edge of the diffuser disk 50 radiated

81, 82

symmetrical, lateral primary reflectors

81a, 81b

first, second reflection areas, symmetrical to the transverse axis E

81c

central connecting web, in particular additional reflection range for a fluorescent lamp

81d

central support area, z. B. for an LED band

9

central secondary reflector

91a, 91b

first, second reflection flanks, in particular parabolic

92a, 92b

contact surfaces

93

Vertex in the light scattering interior 15

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• DE 10335748 A1 [0002]
• DE 202009014258 U1 [0004]
• DE 202009010018 U1 [0005]

Claims (22)

Luminaire with a frame-shaped flat profile housing which is symmetrical to a longitudinal axis (A) ( 1 ) with two opposite longitudinal profiles ( 11a . 11b ), whereby a light exit field ( 16b ) on a lower side ( 13b ) for emitting a direct light component ( 7 ) and a light exit field ( 16a ) on a top side ( 13a ) for emitting an indirect light component ( 6 ), a. in the longitudinal profiles ( 11a . 11b ) lying opposite one light unit ( 2 . 3 ) with an underlying, to a transverse axis (E) of the flat profile lamp ( 1 ) symmetrical primary reflector ( 81 . 82 ) are arranged so that they in a Lichtstreuungsinnenraum ( 15 ) between the longitudinal profiles ( 11a . 11b ), the light exit field ( 16b ) for the direct light component ( 7 ) on the bottom ( 13b ) and the light exit field ( 16a ) for the indirect light component ( 6 ) at the top ( 13a ) radiate laterally, characterized by b. a central secondary reflector ( 9 ), which in the light scattering interior ( 15 ) is arranged approximately in the region of the longitudinal axis (A) so that a part ( 7a2 ) of the light units ( 2 . 3 ) via the symmetrical primary reflectors ( 81 . 82 ) of laterally irradiated light in the direction of the light exit field ( 16b ) for the direct light component ( 7 ) on the bottom ( 13b ) is deflected. Luminaire according to Claim 1, with a beam splitter disk ( 40 ) for the indirect light component ( 6 ) in the light exit field ( 16a ) at the top ( 13a ). Luminaire according to claim 2, wherein the beam splitter disk ( 40 ) approximately in the middle along the longitudinal axis (A) parallel to the light units ( 2 . 3 ) longitudinal zone ( 43c ) with increased reflectivity with reduced light transmission and on both sides in each case a longitudinal zone ( 43b ) having reduced reflectivity with increased light transmission. Luminaire according to claim 3, wherein the beam splitter disk ( 40 ) on both sides to the longitudinal zones ( 43b ) with reduced reflectivity with increased light transmission in the area of the longitudinal profiles ( 11a . 11b ) of the flat profile housing ( 1 ) each additionally a longitudinal zone ( 43a ) again with increased reflectivity with reduced light transmission. Luminaire according to claim 3 or 4, wherein the longitudinal zones ( 43a . 43b . 43c ) on a light scattering interior ( 15 ) facing inside ( 42 ) of the beam splitter disk ( 40 ) are mounted, in particular as a striped pattern with different densities and / or line weights are printed. Luminaire according to one of claims 2 to 5, wherein the central secondary reflector ( 9 ) on a light scattering interior ( 15 ) facing inside ( 42 ) of the beam splitter disk ( 40 ) is attached. Luminaire according to one of the preceding claims, with a diffuser disc ( 50 ) in the light exit field ( 16b ) for the direct light component ( 6 ) on the bottom ( 13b ). Luminaire according to claim 7, wherein the diffuser disc ( 50 ) on the light scattering interior ( 15 ) facing away from outside ( 51 ) Longitudinal prisms has on. Luminaire according to claim 7 or 8, wherein the diffuser disc ( 50 ) at the edges to the longitudinal profiles ( 11a . 11b ) on the light scattering interior ( 15 ) facing inside ( 42 ) Longitudinal zones ( 52a . 52b ) having a filter-like coating. Luminaire according to claim 9, with a partially transparent printing as a filter-like coating in the longitudinal zones ( 52a . 52b ). Luminaire according to one of the preceding claims, wherein the light units ( 2 . 3 ) in each case at least one elongate illuminant ( 22 . 32 ) inside the longitudinal profiles ( 11a . 11b ) of the flat profile housing ( 1 ) exhibit. Luminaire according to claim 11, with fluorescent tubes as oblong bulbs ( 22 . 32 ). Luminaire according to claim 12, wherein the respective one fluorescent tube has an electric power of a maximum of 49 or 35 watts. Luminaire according to claim 11, with light emitting diodes as elongated light sources ( 22 . 32 ). Luminaire according to Claim 14, with light-emitting diode strips ( 23 . 33 ) as elongated bulbs, especially LED stripes. Luminaire according to claim 14, with chains of free-radiating LEDs ( 24 . 34 ) as elongated bulbs. Luminaire according to one of the preceding claims, wherein the central secondary reflector ( 9 ) one in the Lichtstreuungsinnenraum ( 15 ) protruding vertexes ( 93 ) having. Luminaire according to claim 17, wherein the vertex ( 93 ) of the central secondary reflector ( 9 ) protrudes inwards so that in the light scattering interior ( 15 ) of the respective light unit ( 2 . 3 ) facing subareas ( 15a . 15b ). Luminaire according to claim 17 or 18, wherein the central secondary reflector ( 9 ) of the respective light unit ( 2 . 3 ), in particular parabolically curved, reflecting flanks ( 91 . 91b ) having. Luminaire according to one of the preceding claims, wherein the primary reflectors ( 81 . 82 ) each two strip-shaped, symmetrically to the transverse axis (E) arranged large-area reflection areas ( 81a . 81b ), which via a central connecting web ( 81c . 81d ) are integrally connected. Luminaire according to claim 20, wherein a central connecting web as an additional reflection region ( 81c ) is formed, in particular for a fluorescent tube as an elongated light source. Luminaire according to claim 20, wherein a central connecting web as support area ( 81d ) is formed, in particular for a light emitting diode as an elongated light source.

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