DE20022873U1 - lamp - Google Patents

Description

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lamp

The invention relates to a luminaire with a receiving device for a luminous element and with a housing which at least partially surrounds an interior space provided for the luminous element, wherein the housing has an upper housing part and a lower housing part.

Indirect lights that use a closed lighting system are well known. This leads to a strong increase in the temperature inside the light, which leads to a reduction in the efficiency of the light. The light emitted by the lamp is directed in the desired direction by reflectors, whereby a large distance is required between the light body and the reflector, which leads to an increased height of the indirect light. The well-known reflectors with parabolically shaped reflector segments produce a narrow beam light distribution, but not a wide beam light distribution free of direct glare. This narrow beam light distribution leads, for example, to increased reflections on a table surface.

The object of the invention is to provide a luminaire with which a higher efficiency can be achieved.

The object is achieved by a luminaire with a receiving device for a luminous element and with a housing which at least partially surrounds an interior space provided for a luminous element, wherein the housing has an upper housing part and a lower housing part, wherein at least one gap is present between the upper housing part and the lower housing part, through which an exchange of air is possible between the interior space of the luminaire surrounded by the housing and the outside space.

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As a result of the air exchange between the interior and exterior through the gap, the interior temperature only rises slightly during operation due to the thermal heating in one area of the lamp, which means that the efficiency of the lamps is significantly higher than in known closed lamps, which have an excess temperature of up to 30 ^° C inside - which at normal room temperature corresponds to a reduction in efficiency of around 30%. In particular when using a fluorescent lamp, the operating efficiency depends heavily on the ambient temperature, i.e. the interior temperature of the lamp, due to the thermal heating in one area. A lamp according to the invention makes it possible for the reduction in the efficiency of a fluorescent lamp to be less than 5%.

An advantageous development of the lamp according to the invention just described provides that the upper part of the housing has a first transmitter/reflector and/or the lower part of the housing has a second reflector, which is designed according to one of the designs described above. This increases the efficiency even further, since in addition to the reduction in the ambient temperature of the fluorescent tube due to the gap, a further increase in the efficiency with regard to the emitted light is achieved, since no light reflected by the reflector is reflected back into the lamp.

A further advantageous development of the invention provides that the housing has a cylindrical or tubular shape. A housing shaped in this way is particularly simple and inexpensive to manufacture and is suitable for accommodating a tubular, commercially available fluorescent tube.

A further advantageous development of the invention _provides that the upper housing part is connected to the lower housing part via connecting means, whereby the housing is modified. ^:: : ^:: * * ^{: ::}

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The upper part and/or the lower part of the housing are easily detachably connected to the connecting elements. This makes it very easy to replace the respective part if, for example, it is defective or if the user of the luminaire wants to use another part that he or she considers more suitable for aesthetic, lighting or other reasons.

A further advantageous development of the invention provides that the connecting means are arranged at the ends of the housing. This provides the greatest possible space for a light source that can be arranged in the lamp. In addition, the connecting means can best engage with the housing at the end of the housing and are also best accessible there, so that replacement is easy.

A further advantageous development of the invention provides that the connecting means have lugs that engage in a form-fitting manner in the upper housing part and/or in the lower housing part. This ensures a simple and yet secure connection between the upper housing part or the lower housing part and the connecting means.

A further advantageous development of the invention provides that the lower housing part is made in two parts, with a carrier body to which the reflector is detachably connected, which is held in position with respect to the upper housing part by the connecting means. This makes it possible for the reflector to be replaced very easily without the entire lower housing part having to be detached from the connecting means. This saves time when changing a reflector or the lamp, and also saves material and therefore costs.

A further advantageous development of the invention provides

that the carrier body is tubular. In the case of- :··:··· ······ ····· ·····:*··: : : :

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For example, it is available as a round tube, rectangular tube or oval tube, with the cut surface of the tube being designed in particular as a second-order curve (closed line). A tubular support body is very simple and inexpensive to manufacture and is also easy to connect to the connecting means.

A further advantageous development of the invention provides that the housing is ring-shaped. This also makes it possible to provide a luminaire for a fluorescent lamp that is ring-shaped. This means that the advantages described above can also be optimally exploited with ring-shaped lighting elements.

A further advantageous development of the invention provides that the housing is designed in one piece. Such a housing is easy to manufacture and there is no risk of the lower housing part or the upper housing part accidentally detaching from the connecting means, for example because they were not properly connected to it. This prevents damage to the lamp.

A further advantageous development of the invention provides that the at least one gap runs horizontally. This is particularly advantageous for lights that extend in a horizontal plane, since the gap can then be particularly long and thus leads to a particularly good exchange of air between the interior and exterior of the light.

A further advantageous development of the invention provides that the at least one gap is so large that at least one of the reflectors fits through it. This makes it very easy to replace a reflector by simply pushing it through the gap of the light

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te is pulled out and a new reflector is pushed through the gap into the lamp.

A further advantageous development of the invention provides that there are two parallel gaps. This further improves the exchange of air between the interior of the lamp and the exterior, so that the efficiency of the fluorescent lamp (in the lamp) is even greater. The two gaps are preferably arranged on two opposite sides of the lamp. This achieves an advantageous aesthetic effect, since the lamp is designed symmetrically.

A further advantageous development of the invention provides that the upper housing part is convex with respect to the interior of the housing. This forms a roof that covers the lamp body and prevents dirt falling from above from falling into the lamp. The dirt that falls onto the upper housing part slides along the curvature of the upper housing part outwards to the edge and finally falls off. Dirt that does not fall off, such as dust, can be easily cleaned off thanks to the convex shape of the upper housing part, since there are no edges and corners that are difficult to reach.

A further advantageous development of the invention provides that the upper part of the housing is transparent. This means that all the light emitted and reflected upwards reaches the ceiling, from where it is reflected back into the room as very pleasant diffused light. This means that a very high level of efficiency is achieved for this indirect light.

A further advantageous development of the invention provides that it is a hanging lamp that can be connected to a ceiling by means of at least one fastening element. Preferably, the at _least one

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. 5 fastening element around an electrical sheathed cable. This means that it is not necessary, but possible, to use a steel wire as a support on which the lamp is suspended from the ceiling. This type of lamp is therefore particularly easy to install. This is achieved by the fact that a lamp manufactured according to one of the designs described above can be made very light.

A further advantageous development of the invention provides that the at least one fastening element is covered by a covering which is concave with respect to the lamp, in particular in a section having the shape of a circular segment. Such a canopy-like covering has the advantage that the light emitted or reflected upwards on the ceiling does not have high luminances at specific points, but rather a homogeneous illuminance structure is achieved on the ceiling due to the shape of the canopy-like covering. This leads to pleasant lighting through the indirect light which is scattered by the canopy-like covering.

A further advantageous development of the invention provides that the lamp can be pivoted about an axis parallel to the at least one gap. This makes it possible to pivot the lamp into such a position that the at least one gap is arranged in such a way that it forms the lowest point of the lamp. This leads to foreign bodies falling out that may have entered the interior of the lamp, such as flies that were attracted by the lamp and cannot withstand the thermal stress due to the high temperature on the lamp surface in the lamp. This means that it is not necessary to take the lamp apart in order to get such foreign bodies out of it.

A further advantageous development of the invention provides that aj-^cht^r^r. Ur. ^r .^häpmeyojr direction of the

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The lamp is preferably a fluorescent lamp, in particular a high-performance fluorescent lamp. This results in a high luminance and thus good room illumination with a relatively thin tube, whereby the advantages of the embodiments described above are particularly effective. In particular, there is a strong increase in efficiency compared to known lamps with fluorescent lamps. There is also homogeneous lighting through the indirect light and good glare control of the direct light. This glare control is necessary because modern fluorescent lamps have luminances of up to 30,000 cd/m ^2. When you look directly into such a lamp, the eye's perception is temporarily switched off, so that you then briefly see black dots in front of your eyes. This is avoided by the glare control measures. Furthermore, the luminance of the lamp and the surfaces surrounding it is reduced so that when working on the screen, the luminance in the viewer's field of vision is not too high, so that the viewer is not perceived as glare.

Furthermore, the object is achieved by a method for cleaning the interior of a lamp which is designed according to one of the embodiments described above, wherein the lamp is pivoted about the parallel axis. The advantages achieved by such a method are described above.

Furthermore, the object is achieved by a method for illuminating a room, using a lamp that is designed according to one of the embodiments described above and/or a reflector that is designed according to one of the embodiments described above. The advantages achieved by such a method are described above in the context of the description of the reflector or the lamp.

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detailed, so that reference is made to them here. In particular, the problem is solved by a method for lighting a room in which light is emitted by a lamp, reflected by a reflector in the glare-free area and passes around the lamp into the room to be illuminated. This method increases the efficiency of lighting a room in particular because no light penetrating the glare-free area is reflected back into the lamp, but rather is guided around the lamp into the room to be illuminated.

Furthermore, the problem is solved by a method for reducing the luminance in the direct light of a lamp, whereby a partially transparent reflector, which is designed according to one of the embodiments described above, is brought into the radiation field, in particular the beam cone of the lamp. This makes it possible, even with lamps that have a high luminance, to look into the area from which light is emitted by the lamp without being blinded. The reduction in the luminance in the direct light does not mean, however, that less light leaves the lamp; rather, the light that does not pass through the partially transparent reflector is perceived as indirect light, which is scattered, for example, over the ceiling. This results in optimal efficiency.

A further development of this method according to the invention provides that the degree of reduction of the luminance is varied by using various partially transparent or transparent reflectors. This makes it possible to take into account the individual room requirements or the personal preferences of the user of the lamp. For example, aiA.- _Ä euc*t4Lchte .des. di.rek.te«. light can be more strongly reflected.

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reduced if the luminaire is often in the user's field of vision, for example when looking at a screen, such as a luminaire above a table. It is also possible to choose a smaller reduction in direct luminance if the luminaire is installed in a place where it is hardly in the user's field of vision, for example behind a sofa, a cupboard or a partition.

A further advantageous development of this method provides that the achieved glare control angle can be varied by inserting and/or moving various partially transparent or transparent reflectors, which are designed according to one of the designs described above. This makes it possible to adapt the glare control angle at which the direct light is glare-free to the respective room conditions or the personal taste of the user by choosing the reflector and/or varying the distance of the reflector from the light source. For example, it is not necessary to provide a large glare control angle for a light that is arranged in a corner or niche. On the other hand, this may well be desirable for a light that is freely positioned in the room. i

Furthermore, the object is achieved by using a partially transparent reflector, which is designed according to one of the embodiments described above, to reduce glare from the direct light of a lamp. With regard to the advantages, reference is made to the above statements.

Furthermore, the object is achieved by using a partially transparent reflector, which is designed according to one of the embodiments described above, for guiding the light emitted by a luminaire of a lamp

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around the luminous element. For the detailed design of the partially transparent reflector and the advantages resulting from its use, please refer to the above explanations.

Furthermore, the object is achieved by using a lamp which is designed according to one of the above-mentioned embodiments in order to increase the efficiency of the luminaire. With regard to the advantages and further details, reference is made to the above explanation.

Further preferred embodiments of the invention are shown in the drawings and explained in the figure description. They show:

Figure 1 A section through a first embodiment of a luminaire according to the invention with a reflector according to the invention,

Figure 2 is a perspective view of the first embodiment of Figure 1 of the luminaire with the reflector,

Figure 3 View of the first embodiment of the lamp and the reflector from the same direction as shown in Figure 2, but showing the hidden edges,

Figure 4 shows a schematic section through the first embodiment with the beam path of individual light rays emitted by the luminous element,

Figure 5 shows a schematic section through a second embodiment of a luminaire, with a double-segment housing upper part,

Figure 6 shows a schematic section through a third embodiment of a reflector with a light element,

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Figure 7 of a luminaire with only a perspective view of the third embodiment of the reflector from Figure 6,

Figure 8 shows a section through part of a fourth embodiment of a reflector,

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Figure 9 shows a section through part of a fifth embodiment of a reflector,

Figure 10 Section through a part of a sixth embodiment of a part of a reflector and

Figure 11 is a schematic, perspective view of a fourth embodiment of a luminaire in the form of a pendant luminaire.

Figure 1 shows a section through a lamp 24. The lamp 24 has a housing 3, which has an upper housing part 5 and a lower housing part 4. The upper housing part 5 is connected to the lower housing part 4 by means of a connecting means 10. The upper housing part 5 is arranged in a holding device 26 on the connecting means 10. The holding device 26 has two U-shaped legs 26a, on the inside of which pointed noses 19 are formed. The noses 19 engage in the upper housing part 5 in a form-fitting and force-fitting manner and thus hold it firmly in its position relative to the connecting means 10. The lower housing part 4 is wave-shaped in cross-section and has a wave crest in its center. This wave crest forms an axis of symmetry 25, to which the lower housing part is formed symmetrically. The wave crest rests on a tubular support body 6, which is connected to the connecting means 10 via a bearing block 27 arranged on the connecting means 10. The bearing block 27 encloses the tubular support body 6 in a form-fitting manner over more than half of its circumference. This ensures that the support body 6 is securely fixed in position with respect to the connecting means 10 and thus also the housing base 4 with respect to the connecting means 10. A reflector 8 in the form of a double-segment reflector is located on the housing base 4.

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positively locking, which has two wings 8a, 8b that are arranged symmetrically to the axis of symmetry. A knurled screw 28 connects the carrier body 6 to the connecting means 10 and to the lower housing part 4 and the reflector 8. This ensures a simple and secure connection of these parts to one another and to the upper housing part 5. The reflector 8 has a reflective surface 12 that faces away from the lower housing part 4. The described arrangement of the upper housing part 5, connecting means 10 and lower housing part 4 defines an interior 11 of the lamp 24. A gap 7 is formed between the upper housing part 5 and the lower housing part 4 or the reflector 8. A receiving device 2 in the form of a lamp holder for a lamp 1 is arranged on the connecting means 10, in which a lamp 1 is arranged. The receiving device 2 in the form of a lamp holder supplies the lamp 1 with power.

When the luminous element 1 emits light, the air in the interior 11 of the lamp 24 heats up. The gap 7 ensures an exchange of air with the outside, so that the excess temperature in the interior 11 of the lamp 24 does not increase by more than 5 degrees Celsius. The efficiency of a fluorescent tube depends heavily on the ambient temperature around the luminous element 1. Since the temperature only increases imperceptibly, the efficiency reduced by thermal effects also drops by a maximum of 5% compared to a free luminous element 1, i.e. not arranged in a housing 3. The housing lower part 4 is transparent, whereas the reflector 8 is partially transparent, i.e. the reflective surface 12 of the reflector 8 allows part of the light emitted by the luminous element 1 to pass through.

emitted light passes through, another part is reflected. The section through the reflective surfaces 12 is in each case a second-order line which consists of continuously differentiable contour elements arranged next to one another - in the simplest case of circular segments or one circular segment. The radii of curvature of the respective segments of the partially transparent reflector are identical to those of the lower housing section 4, except for the material thickness. The design of the reflector 8 shown ensures that the light emitted by the luminous element 1 is not reflected back onto the luminous element 1, but is directed past it and thus serves to illuminate the room in which the lamp 24 is located. This achieves optimum efficiency of the lamp 24, since none of the light rays emitted by the lighting element 1 are lost. The partially transparent design of the reflector 8 reduces glare in direct light. This is necessary because modern fluorescent lamps have luminances of up to 30,000 cd/m ² . However, such high luminances are harmful to the human eye and lead to failures, so that glare control of the direct light is necessary. By reducing the luminance by means of a partially transparent reflector 8, it is therefore possible for the user to look into the direct light of the lamp 24 without having to worry about health damage. The two gaps 7 are so large that the reflector 8 can be easily removed from the lamp 24 through them. This makes it easy to replace the reflector 8. This is advisable, for example, if the reflector 8 has been damaged or if the user of the lamp 24 would like to have a different reflector 8 with a different partial light transmission, a different pattern

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or a different color in which you want to use the lamp 24. On the other hand, the gap is so small that when the reflector (no B.d.A.) is moved from the right-hand side, the reflector hits the stop lug 29 so that the gap on the side where it hits is smaller than a (VDE) finger, so that you cannot touch the lamp base. Alternatively, in addition to the stop lug 29, a stop ring 30 can also be used. This prevents the lamp base from being touched with a (VDE) finger even when the reflector 8 is removed. Optionally, a locking screw (knurled screw) 28 (necessary in rough use) can connect the lower housing section 4 and/or the support tube 6 and the partially transparent sector 8 and/or the support tube 6 and the connecting part 10 to one another. The upper housing part 5 is completely transparent so that all the light emitted directly by the lamp 1 passes through the upper housing part 5. The same applies to the indirect light reflected by the reflector 8. As a result, there is no reduction in the intensity of the light emitted or reflected upwards, so that a large-area, uniform, pleasant illumination is achieved on the ceiling. The ceiling serves as a diffuser and the room in which the lamp 24 is arranged is well illuminated. The upper housing part 5 is connected in a form-fitting manner to the U-shaped legs 26a of the holding device 26 via the lugs 19, which can be pyramid-shaped or conical. When the upper housing part 5 is pushed into the holding device 26, the tips of the lugs 19 are deformed and the lugs 19 are wedged in the upper housing part 5 in a force-fitting and form-fitting manner. This connection is extremely reliable and there is no accidental loosening of the

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Upper housing part 5 from the holding device 26 and thus from the connecting means 10. In the following, elements with the same effect are provided with the same reference numerals.

In Figure 2, the first embodiment of the lamp 24 known from Figure 1 is shown in a perspective view. The lamp 24 (without the lamp body 1) is essentially cylindrical, with the connecting elements 10 being arranged on the front sides of the lamp 24. The gap 7 extends from one end of the lamp 24 to the other, i.e. from one connecting means 10 to the other connecting means 10. The upper housing part 5 is inserted into the holding means 26 of the connecting means 10 and is enclosed by the U-shaped leg 26a. The tubular carrier body 6 is in the bearing block 27 of the connecting means

10. The transparent lower housing part 4 is arranged on the carrier body 6. The reflector 8, which is visible through the gap 7, is located on this lower carrier part 4. The reflector 8 is only shown in a small part of the lamp 24 so that the light behind it in the interior

11 of the lamp 24 is visible. In reality, the reflector 8 extends over the entire length of the column 7 from one end of the lamp 24 to the other.

Here, the knurled screw 28 connects the carrier body 6 to the housing base 4 but not to the reflector 8, so that the reflector 8 can be removed from the lamp 24 through the gap 7 and replaced by another reflector 8.

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Figure 3 is a representation of the first embodiment of the lamp 24 from the same perspective as shown in Figure 2, but here the hidden edges are made visible. This makes some details visible, which will be discussed below. The features described with regard to Figure 2b will not be discussed again. The reflector 8 has two wings 8a, 8b, as already shown in Figure 1, and rests essentially in a form-fitting manner on the lower housing part 4. Optionally, the parts described can be connected to one another using a fixing device 28. The luminous element 1 is mounted in the two connecting means 10 in the receiving device 2, via which it is supplied with power. The electrical supply line is not shown, as in the previous and following figures, since it is no different from conventional lamps 24 and is also not essential to the invention. The lugs 19 on the fixing means 26 can be clearly seen as they engage the ends of the upper housing part 5, which are inserted into the fixing means 26 of the connecting means 10. In addition, the U-shaped enclosing of the legs 26a around the ends of the upper housing part 5 can be clearly seen. The knurled screw 28 connects the same parts as in Figure 2.

Figure 4 shows schematically the beam path in a lamp 24, which has a partially transparent reflector 8 as the lower housing part 4 and a transparent upper housing part 5. The light emitted upwards by the lighting body 1 is almost not reflected by the transparent upper housing part 5. Thus, the ceiling 21 generally present above the lamp 24 (see Figure Ha) is directly illuminated. The

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Light emitted downwards from the luminous body 1 hits the partially transparent reflector 8, so that some of the light rays are reflected by it. The reflector 8 is geometrically designed in such a way that the light reflected by it does not hit the luminous body 1, but is guided around it. The light rays passing through the reflector 8 are not shown for the sake of clarity. In order for the reflector 8 to fulfil this special light-guiding function, it is made up of two wings 8a, 8b which are designed symmetrically to the axis of symmetry 25. The axis of symmetry 25 here runs perpendicular to the plane of the drawing. Each of the wings 8a, 8b of the reflector 8 is designed on its reflective surface 12 in section as a second-order curve, as a series of circular segments with a continuously differentiable curve contour, preferably as a single circular segment. The centers of the radii of curvature or the centers of the circular segments lie on central planes that pass through the axis of the luminaire. In the simplest case, this is a horizontal central plane E of the luminaire 1. The ratio between the distance d of the virtual centers and the center of the luminaire 1 to the respective radii of curvature is in a range from 1:1 to 2:1. The reflector 8 reduces the direct portion of the light emitted by the luminaire 1, so that the direct light is glare-free in the angle range γ. The angle γ depends on how far the reflector 8 is pulled upwards on its contour path (circular segment path). In Figure 4, it is also easy to see how the gaps 7 are formed between the reflector 8 and the upper housing part 5, through which a good exchange of air between the interior 11 of the luminaire 24 and the outside is possible. This makes the

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The high efficiency of the luminaire 1 mentioned above can be achieved.

Figure 5 shows a further embodiment of a lamp 24 in a schematic representation, wherein, compared to the embodiment of Figure 4, the transparent upper (monosegment) housing part 5 is replaced by a double-segment housing part 9. The double segment is constructed along the lamp axis symmetrically to the vertical plane that passes through the lamp axis of the lamp element 1. The double-segment housing upper part 9 is also transparent, so that the rays transmitted by it have almost the same effect (apart from the reflection and transmission data changed according to the Fresnel formulas) as with the monosegment housing part, but with a different shape and visual appearance. Identical and equivalent parts are designated with the same reference numbers as in Figure 4. Reference is made to the description of Figure 4 for their arrangement and mode of operation. It is also possible to replace the transparent upper housing part 5 with a second reflector 9. The second reflector 9 is then constructed in the same way as the first reflector 8 and is arranged mirror-symmetrically with respect to the horizontal center plane E of the lighting element 1 to the first reflector 8. The second reflector 9 is also partially transparent, so that the rays of light emitted by the lamp that are reflected by it have the same effect as that which was carried out with respect to the first reflector 8 in Figure 4. This achieves a reduction in the luminance in direct light in both the light emitted upwards and downwards by the lighting element. This

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is particularly advantageous if the lamp 24 is in a

Room is only arranged so high that it can also be seen from above

can be viewed. For example, this is the case with a desk lamp 24.

Figure 6 shows a further embodiment of a lamp 24. To simplify the illustration, only the lighting element 1 is shown in its spatial relationship to the reflector 8 and the housing base 4. The design of the reflector 8 is the same as that shown in Figures 4 and 5, so that reference is made to the description of these figures with regard to the individual features. The reflector 8 rests essentially in a form-fitting manner on the housing base 4. The housing base 4 is only rounded in the area of the symmetry axis 25 and thus remains at a distance below the reflector 8. The housing base 4 is also transparent here, but the reflector 8 has a partially transparent surface 12 that faces the lighting element 1. The beam path that represents the light emitted by the lighting element 1 has been omitted here, but it corresponds to that shown with regard to the reflector 8 in Figures 4 and 5.

Figure 7 shows the spatial design of the reflector 8 shown in Figure 6 and the housing base 4 in a perspective view. It can be clearly seen that the circular segment-shaped surfaces 12 of the reflector 8 in the three-dimensional design, as shown in Figure 6, each correspond to a cylinder shell

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The two cylinder shells are joined together along the axis of symmetry 25. This design results in the beam path shown in Figures 4 and 5 in the reflected light along the entire length of the tubular light element 1, so that the reflected light from the reflector 8 is not reflected back into the light element 1, but is directed around it. This ensures the high light output described above along the entire length of the light element 1.

Figure 8 shows a further embodiment of a reflector 8. This is a perforated sheet 18 made of a reflective material, for example aluminum, which has holes 18a and webs 18b located between them. The reflector 8 is partially transparent because it reflects the light rays falling on it from a luminous body 1 only at the points where the webs 18b are located between the holes 18a. If a light beam falls on one of the holes 18a, this light beam passes unhindered through the reflector 8. The degree of transparency of the reflector 8 and thus its anti-glare properties by reducing the luminance perceived by the viewer is determined by the ratio of the area of the holes 18a to the area of the webs 18b and the size of the hole itself. Such a reflector 8 in the form of a perforated sheet 18 is very simple and inexpensive to manufacture, for example by punching holes 18a out of an aluminum sheet. Thus, the purchaser of a lamp 24 can select the appropriate reflector 8 and insert it into the lamp 24 depending on the use of the lamp 24 and the desired properties of the same.

Figure 9 shows a further embodiment of a reflector 8. The reflector 8 has a transparent base body 13, for example made of a transparent plastic such as Plexiglas. A reflective, perforated material 14, _which can be metallic, for example, is applied to the transparent base body 13 by means of a screen printing process. This reflector 8 reflects those light rays that strike the reflective material 14. The degree of reduction in luminance achieved by the reflector 8 also depends on the ratio between the reflective surface and the transmitting surface and the size of the hole. This means that the degree of reduction in luminance can be adjusted by the size of the surface to which reflective material 14 is applied. Such a reflector 8 can also be specially adjusted to the customer's wishes and manufactured in many different variants with regard to the reduction in luminance.

Figure 10 shows a further embodiment of a reflector 8. This reflector 8 also has a transparent base body 13. A film 17 is glued to this transparent base body 13, which has reflective areas 15 and transparent areas 16. With regard to the degree of reduction in luminance and the simplicity of production or the response to customer requests, the same applies as was already stated above for Figures 8 and 9.

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Figure 11 shows a further embodiment of a lamp 24. This is a hanging lamp that is attached to a ceiling 21. The lamp 24 is only shown schematically here, with the upper housing part 5 and the lower housing part 4 with the gaps 7 arranged between them being shown. In contrast, neither the connecting means 10 nor the lighting element 1 are shown. The lamp 24 is so light that it is sufficient to hang it from the ceiling 21 using two sheathed cables 20 that carry the electrical current. It is not necessary to use steel wires for this; however, these could be used in addition or integrated into the sheathed cable. The fastening points of the electrical sheathed cables 20 on the ceiling 21 are covered by a covering 22. The covering 22 is designed as a canopy. It is concave with respect to the lamp 24 and extends parallel to the longitudinal extension of the lamp 24. In cross-section, it is designed in the shape of a circular segment, just like the cross-section of the upper part of the housing 5. This results in a design for the covering 22 in the form of a cylinder jacket segment. In addition to the aesthetic effect of covering the suspension points of the lamp 24 on the ceiling 21, such a covering 22 also has a positive effect on the lighting of the entire room in which the lamp 24 is located. The concave design with respect to the lamp 24 does not result in high luminances at specific points, so-called luminance peaks, but rather a homogeneous luminance distribution. The light rays scattered on the covering 22 in the light radiated upwards or reflected light thus lead to an even and indirect lighting of the room that is pleasant for the viewer. The two places where the two sheathed cables 20 from

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the lamp 24 define an axis 23 which runs parallel to the two gaps 7. This axis 23 running along the top of the upper housing section 5 serves as a pivot axis around which the entire lamp 24 can be pivoted. By pivoting the lamp 24 around this axis 23, it is possible to pivot the lamp 24 into a position in which one of the two gaps 7 forms the lowest point of the lamp 24. This causes foreign bodies which may have accumulated in the interior 11 of the lamp 24 to fall out of the lamp 24. This provides a simple and inexpensive way of cleaning the interior 11 of the lamp 24. This is necessary, for example, if flies have flown into the interior 11 of the lamp 24 and are no longer able to fly there due to the high thermal load. This is particularly advantageous when the luminaire 24 is designed in two parts, since a one-piece luminaire 24 cannot be disassembled into the upper housing part 5, the lower housing part 4 and the connecting means 10.

Claims (12)

1. Lamp ( 24 ) with a receiving device ( 2 ) for a luminous element ( 1 ) and
with a housing ( 3 ) which at least partially surrounds an interior space ( 11 ) provided for the luminous element ( 1 ), the housing ( 3 ) having an upper housing part ( 5 ) and a lower housing part ( 4 ),
characterized ,
that between the upper housing part ( 5 ) and the lower housing part ( 4 ) there is at least one gap ( 7 ) through which an exchange of air between the interior ( 11 ) of the luminaire ( 24 ) surrounded by the housing ( 3 ) and the outside space is possible. 2. Luminaire ( 24 ) according to the preceding claim, characterized in that the upper housing part ( 5 ) has a first reflector ( 8 ) and the lower housing part ( 4 ) has a second reflector ( 9 ), which are each partially transparent. 3. Luminaire ( 24 ) according to the preceding claim, characterized in that the upper housing part ( 5 ) and/or the lower housing part ( 4 ) are easily detachably connected to connecting means ( 10 ). 4. Luminaire ( 24 ) according to one of the three preceding claims, characterized in that the connecting means ( 10 ) have lugs ( 19 ) which engage in a force-fitting and form-fitting manner in the upper housing part ( 5 ) and/or the lower housing part ( 4 ). 5. Luminaire ( 24 ) according to one of the preceding claims, characterized in that the housing lower part ( 4 ) is designed in two parts, wherein it has a carrier body ( 6 ) to which the reflector ( 8 ) is detachably connected, which is held in its position with respect to the housing upper part ( 5 ) by the connecting means ( 10 ). 6. Luminaire ( 24 ) according to one of the preceding claims, characterized in that the housing lower part ( 4 ) and/or the reflector ( 8 ) is connected to the carrier body ( 6 ) and the connecting means ( 10 ) by means of a simple knurled screw ( 28 ). 7. Luminaire ( 24 ) according to one of the preceding claims, characterized in that the at least one gap ( 7 ) runs parallel to the carrier body (horizontally). 8. Luminaire ( 24 ) according to one of the preceding claims, characterized in that the at least one gap ( 7 ) is so large that at least one of the reflectors ( 8 , 9 ) fits through it. 9. Luminaire ( 24 ) according to one of the preceding claims, characterized in that two mutually parallel gaps ( 7 ) are present. 10. Luminaire ( 24 ) according to one of the preceding claims, characterized in that the housing upper part ( 5 ) is convex with respect to the interior ( 11 ) of the housing ( 3 ). 11. Luminaire ( 24 ) according to one of the preceding claims, characterized in that the upper housing part ( 5 ) is transparent. 12. Luminaire ( 24 ) according to one of the preceding claims, characterized in that it is pivotable about an axis ( 23 ) parallel to the at least one gap ( 7 ).