EP2880361B1 - Illumination system - Google Patents

Description

The present invention relates to a facade / wall / floor and / or ceiling lighting device having at least one row of radiators each having a point light source preferably in the form of an LED and are arranged side by side of the facade / wall / ceiling / floor surface, and a radiator for such a lighting device.

Recently, facade spotlights have been proposed which use an LED as the light source. In this case, a plurality of such LEDs in the form of a light band can be arranged side by side to illuminate the facade over its entire width or at least a piece thereof. Such light bands are arranged regularly spaced at the upper end of the facade or at the upper end of a facade piece to be illuminated a distance from the facade, so that they obliquely down towards the ground directed illuminate the facade of the building. The facades to be illuminated may hereby be exterior facades or interior facades, for example of interior or light courtyards, but also walls of interiors, halls, courtyards or the like, or even ceilings and floors, which may be flooded, for example, by radiators mounted close to the ground on a wall, or generally at least approximately flat surfaces can be illuminated in a corresponding manner. In particular, approximately flat surfaces with a series of radiators, which are arranged at a small distance from the illuminated surface at an edge region of the illuminated surface, evenly illuminated with obliquely abrasive BE irradiation.

Such facade spotlight assemblies with LEDs are light and elegant. Since they can be made small-sized, they hardly disturb the facade or wall or ceiling picture. In addition, interesting optical effects can be achieved by the large number of emitters, for example, differently colored LEDs can illuminate different sections of the facade differently. Likewise, it is possible in a simple manner to vary the illumination color in time. In addition, LEDs are easy to maintain and energy efficient.

However, such facade spotlight arrangements with punctiform light sources can be improved with regard to the uniformity of the facade illumination and the freedom from glare, the challenge being in particular to achieve this with spotlights arranged very close to the facade, which illuminate comparatively large facade pieces. The ratio of the height of the facade or wall piece to be illuminated to the facade spacing of the radiators should often be 4: 1 or more, often even 10: 1 or more, with ratios typically to be achieved ranging from 5: 1 to 15: 1, which represents a major challenge in terms of uniformity mentioned at the same time glare-free.

In order to achieve reasonably uniform façade lighting in spite of the usually rotationally symmetrical light cones or - in the case of linear reflectors - linear light wedges, it has already been proposed to tilt the façade radiators differently with their radiation cone axis so that the light cones or the areas illuminated on the façade are superimposed or superimposed complement each other to illuminate the façade surface as completely as possible. It has also been proposed, in front of the facade several rows of facade spotlights to arrange, which are aligned at different angles and shine on the facade. However, the achievements achieved by this are limited. It usually remains unevenly illuminated areas, which distorts their appearance, especially in modern, smooth facades. Above all, however, the desired uniformity of illumination is regularly bought by an increased dazzling effect. The differently tilted facade spotlights often cause glare in many places in the façade environment, since at least one facade spotlight radiates from many observation points.

The US 2007/0171631 shows a wallwasher, in which the emitters is associated with a reflector, with the help of which the light is to be made uniform. Furthermore, the shows DE 20 2005 011 747 a wall washer with LEDs as light sources, a good color mixing of the different light colors of the LEDs to be achieved by means of a diffuser element. By means of a reflector, the light of the LEDs is reflected on a side wall, before the light rays hit the diffuser element, which is formed as a sandblasted glass plate.

Furthermore, the shows EP 21 16 761 A1 a façade lighting with "square" radiating spotlights. For this purpose, the light emitted by light sources of the radiator light is transformed by means of free-form lenses in a square, pyramid-shaped beam to illuminate angular facade surface pieces. Furthermore, the font shows EP 22 16 588 A1 a radiator with a bell-shaped reflector, which is composed of a plurality of reflector segments.

Furthermore, the document shows US 2004/0114366 A1 an LED spotlight, which is associated with a reflector, which includes three reflector areas. In order to radiate the LEDs in the reflector and their operating board and to block any reflected light through the LEDs and their operating board, the inner, located below the LED reflector area throws the reflected light on an edge region of the reflector, from which the light then passes through re-deflection is radiated.

On this basis, the present invention seeks to provide an improved facade / wall / floor lighting device of the type mentioned and an improved radiator for this, avoid the disadvantages of the prior art and further develop the latter in an advantageous manner. In particular, a high-intensity facade / wall lighting with high uniformity and low, ideally no dazzling effect in directions parallel to the facade / wall to be achieved, which allows a high mounting position above the illuminated façade / wall piece or sunk into an overlying cornice or ceiling piece.

According to the invention this object is achieved by a radiator according to claim 1 and a facade / wall / floor lighting device according to claim 7. Advantageous embodiments of the invention are the subject of the dependent claims.

It is proposed, by means of a suitable, the light source associated optics instead of a rotationally symmetric or orange-section light cone of the light intensity distribution of the punctiform light source to give a particular oblique, pyramid-like asymmetry to illuminate a preferably rectangular facade piece as evenly as possible on the facade. As a result, the plurality of light sources can complement one another much better, since geometrically regular, in particular rectangular, illuminated façade pieces can be placed against each other or uniformly superimposed on the façade. At the same time the facade radiators can be aligned substantially parallel to each other, i. it is not necessary to achieve the desired uniformity by tilting the radiator axes. According to the invention, the radiators each have an approximately half-shell-shaped reflector which essentially completely captures the light from the associated light source and projects it onto an approximately rectangular surface piece, the reflectors being composed of at least two shell halves, of which shell halves each captures the respective captured light on the shell distributed throughout the reflector illuminated area piece. Due to the double- or multi-shell curvature of the reflectors, the illuminated area piece is, so to speak, twice or more irradiated by each reflector, whereby a high degree of uniformity of the illumination of the entire surface area illuminated by a reflector without light-dark edges is achieved. At the same time it can be ensured that the light source does not cast a shadow, but the light is thrown around the light source substantially completely on the facade or wall, ceiling or floor surface, whereby a high lighting efficiency with efficiencies of preferably more than 80%, in particular even more than 90% can be achieved. At the same time, a very compact, in particular flat construction arrangement of the reflectors can be achieved, which ensures a light, less disturbing appearance and space-saving installation under or in cornices or adjacent ceiling or wall sections.

The contouring of the overall half-shell or shell-shaped reflectors or their curvature halves can in this case in an advantageous embodiment of the invention in particular be such that the beam path through the deflection at the reflector surface undergoes a reflection and converges or irradiated by the light source reflector portion, which - when viewed through the light source perpendicular to the facade piece to be illuminated - offset to one side of the light source which throws captured light onto a patch lying on the opposite side of the light source.

According to the invention, each of the shell halves of a reflector is formed double convergent working, so that the outgoing from a shell half beam path - approximately, roughly speaking - a particular oblique double pyramid or, depending on the peripheral contour of the surface to be illuminated, a particular oblique double cone or a double in a similar manner forms convergent radiation body. Such a doubly convergent design of the reflector shell sections makes it possible to capture the light emitted by the light source, in particular a half-space, essentially completely with only one overall half-shell-shaped reflector and to radiate substantially completely past the light source onto a predetermined areal piece. The light can thereby be blasted past the plurality of shell halves on different sides of the light source, so that the light source sits in an at least approximately recessed area of the reflected beam path and does not generate losses due to shadowing. In this case, a high efficiency can be achieved, since the light emitted from the light source light beams must be reflected only once and insofar only reflection losses occur. At the same time, the spotlight is almost unlimited in terms of its positioning, since the light source can sit more or less directly between the reflector and the surface to be illuminated.

The different shell halves of a reflector need not form "halves" in the sense of each 50% of the total reflector surface, but may deviate from this deviating surface parts, for example, smaller and larger surface parts of the overall approximately half-shell-shaped reflector, which may also be provided more than two shell halves , which together form an approximately half-shell-shaped Reflector of a radiator form. With such a doubly convergent design of the shell parts of the reflector, in particular rectangular facades, alternatively but also differently contoured, limited surface pieces such as multi-cornered hexagons, ovals or almost arbitrarily contoured surface pieces to be illuminated, at least approximately flat surface evenly and glare-free be illuminated.

The shell halves or parts of a reflector are in each case contoured such that a lower shell half edge section illuminates an upper edge section of the illuminated facade section and / or an upper shell half edge section illuminates a lower edge section of the illuminated facade section. In this way, an increased installation position of the facade spotlights can be achieved substantially completely above the facade / wall piece to be illuminated, so that the facade spotlights do not affect the view of the illuminated facade piece. In particular, by the said beam reversal or reflection also a recessed installation of the facade spotlights, for example, in a lying above the facade piece to be illuminated cornice or an overlying ceiling and yet the facade or wall up to the cornice or the Ceiling to be illuminated.

In a development of the invention, a corresponding reflection or convergence in the horizontal direction can also be provided in the vertical direction and the reflector or each of its shell halves can be contoured such that a right shell edge section illuminates a left edge section of the illuminated facade section and / or a left shell edge section illuminated a right edge portion of the illuminated facade piece. In this way, a mounting situation can be realized with up to the edge region of the surface piece to be illuminated emitters.

In this case, the reflector can advantageously be designed in such a way that the beam cone emitted by the plurality of shell halves or pyramids or lobes at least approximately in a common plane, in particular at least approximately in the region of the opening cross-section of the reflector, each have a beam path constriction or their focus point (in the sense of successive conical tips of a double cone).

These constrictions of the beam paths of the reflected light in a common plane can be used to realize a largely hidden installation of the radiator and / or to put a diaphragm in front of the reflector, which lies in said common plane and in the region of the beam path constrictions mating , For example, has slot-shaped or hole-shaped light passage openings whose diameter or width is only a fraction, for example. Less than 1/3 or less than ¼ of the diameter or the maximum width of the reflector. Said aperture can in this case be formed by a self-contained, the light source reflector arrangement enclosing, for example, tubular housing, which has said hole or slot-shaped light exit openings

In particular, all or some of the reflectors may each be approximately double-pear-shaped or twin-shell-shaped with a convexly curved or pointed tapering transition ridge between the two shell halves on the reflector surface. The reflector surface and / or each of its shell-shaped halves can be designed in particular as a free-form surface. In particular, the two shell halves of a respective reflector together may form an approximately double-pear-shaped half-shell, which has a substantially gap-shaped constriction formed by the transition region of the two shell halves. The reflectors may each be integrally formed and the shell halves integrally connected to each other. Depending on the light distribution or deflection to be achieved, said constriction may extend in different directions or planes of the reflector shell. For a plurality of applications, it may be advantageous to arrange said gap-shaped constriction between the shell halves in a longitudinal center plane of the respective reflector, so that the two shell halves bulge away to the right and left of the said constriction. Said constriction forms the connection area or the connection between the two shell halves.

The shell halves can be formed approximately the same size, but can also be designed differently large, for example, if the aforementioned constriction does not run centrally over the reflector body. The half-shell term does not have to be understood in the sense of 50% half of the surface, but may also denote differently sized surface or carcase pieces or shell sections, it also being possible for more than two shell halves to be provided.

In an advantageous embodiment of the invention, said constriction may extend in a plane which is on the one hand perpendicular to the surface piece to be illuminated and on the other hand perpendicular to the longitudinal direction, along which the emitters are lined up. If the radiators are lined up, in particular, approximately horizontally along an upper edge section of a façade piece to be illuminated, the reflectors can be contoured in such a way that said constriction extends in a vertical plane. If the facade radiators along one side of the facade piece to be illuminated in particular strung approximately vertically, said constriction may extend in a horizontal plane.

In particular, the reflectors are each contoured such that the captured by the associated light source light is not transformed into a circular or round cone of light, but in a preferably oblique pyramid of light, ie the outgoing beam from the reflector has in its entirety a polygonal, preferably approximately rectangular cross-section, so that the illuminated patch is also more or rectangular. In particular, in this case each of the two aforementioned shell halves, of which a total of half-shell-shaped reflector is composed, be such that each shell half itself transforms the light captured by the associated light source into such a pyramidal light beam, wherein the two pyramids emerging from the shell halves overlap in such a way that a polygonal, in particular rectangular patch is illuminated on the façade or surface to be illuminated.

In a further development of the invention, the reflector / light source arrangement can be arranged that the respective light source emits the light emitted by it substantially completely into a half-space which is at least largely remote from the surface piece to be illuminated and is arranged such that the half space faces the reflector , wherein the half-shell-shaped bwz. shell-shaped reflector surrounds the light source so far that said half-space is covered by the reflector. An axis of symmetry of said half-space can be aligned at right angles to the facade or wall, but this also slightly tilted, for example, at an angle of about 90 ° ± 30 °, be, so that the half-space still predominantly facing away from the facade or wall is.

In order to achieve high lighting efficiency, the reflectors are each contoured such that the reflectors substantially completely direct the captured light around the associated light source and cast it onto the patch to be illuminated. Advantageously, the reflectors can in this case be designed such that the light is deflected only once at the reflector surface. The reflector can easily work deflecting, so that stray losses are avoided by multiple deflection.

In an advantageous development of the invention, the light sources can each be arranged in the region of the opening cross-section of the respective associated reflector within the space region enclosed by the reflector edge. The reflector edge can define at least approximately one plane, wherein the light source associated with the reflector can advantageously be arranged in this plane or can be positioned only relatively slightly below or above this plane. As a result, on the one hand, the entire half-space, in which a point-like light source such as an LED emits, enclosed and radiated Essentially, light will be completely captured by the reflector. At the same time, an overall flat construction of the light source / reflector arrangement can be achieved.

In a further development of the invention, the light source can be arranged in the region of the longitudinal center plane of the reflector, but not exactly centered, but offset to one side of the reflector shell. In particular, the light source can be offset from the constriction of the reflector offset from the reflector center out to the side at which the constriction has a smaller depth. Said constriction may extend over the reflector cup and thereby have a depth or height which decreases from one side of the reflector towards the opposite side of the reflector. On the side of the reflector shell, where the constriction has the smaller depth or height, the two shell halves merge more harmoniously into one another and are less strongly separated from one another or have a less pronounced or less pronounced transition. In an advantageous embodiment of the invention, the light source is offset to the side in which said constriction is less pronounced.

In order to further improve the mixing of the light on the area illuminated by a radiator and to make the contouring of the reflector shell or the positioning of the light source relatively uncritical relative thereto, a faceting of the shell-shaped reflector surfaces can be provided in a further development of the invention. Such surface structuring with a multiplicity of facets can be provided only for one of the half-shell or quarter-shell-shaped reflector surfaces or generally only for part of the reflector, for example such that one reflector quarter shell is faceted and the other reflector quarter shell is smooth, thereby already providing a certain amount Homogeneity can be achieved because both reflector quarter shells irradiate the same area substantially completely. In an advantageous development of the invention, both reflector quarter shells or the entire reflector surface can be structured with such a multiplicity of facets. In particular, together with the previously explained irradiation principle that both halves of the reflector shell substantially completely illuminate or illuminate the common surface piece, can be achieved with such a faceting a beautiful homogenization of the illuminated area.

The said facets are advantageously designed to be small relative to the reflector surface, wherein preferably more than one hundred, in particular more than two hundred facets may be distributed over the reflector surface, possibly also in the form of a microfacetted surface structure. In this case, the faceting can advantageously be distributed in the form of a matrix or distributed in a cloud-shaped manner, ie. H. The facets do not all have to be the same size and can be arranged differently according to a cloud distribution, but overall cover the reflector surface uniformly. In particular, the facets can be formed in several rows and columns both in the longitudinal direction and in the transverse direction-in relation to the previously explained division of the reflector surface, for example, such that more than ten, in particular more than twenty rows and in the longitudinal direction and in the transverse direction Columns of such facets are provided.

The shape of the faceting can also vary, advantageously polygonal, in particular rectangular and approximately square facets or generally regularly geometrically shaped facet pieces whose extent in the longitudinal and transverse directions is about the same size can be provided.

As an alternative to geometrically regular facets, irregularly shaped surface structure shaped surface pieces may also be formed in the reflector surface, for example in the form of an orange peel structure, as obtainable, for example, by etching the surface or a satin matt surface structure, as for example by sandblasting the surface is available. A microfacetted surface also improves the light mixing and the light source / reflector system insensitive to position and shape tolerances while improving the uniformity of the illumination are made.

In order to achieve a high degree of glare freedom despite high illuminance levels on the facade or illuminated surface, the reflectors are shaped in such a way that the radiators have a longitudinal blanking or a luminous blank parallel blanking, i. in the direction parallel to the facade or illuminated surface, the light intensity is more or less zero. The blanking is in particular such that in a plane parallel to the facade, which goes through the facade spotlight row or has the same distance from the facade as the facade spotlights, the light intensity in a ground-level area approaches zero. Even in planes that are parallel to the illuminated surface between the radiator and the illuminated area, a dimming is given, so that, for example, people who are closer to the illuminated wall than the facade spotlights, in normal viewing direction - not straight up - no glare Experienced. Only if you approach the façade more or less directly and look up into the row of facades, a dazzling effect can occur. However, as soon as a passerby steps away from the façade only a small distance - as is customary in normal foot traffic on a pavement -, or a neighbor the illuminated facade, for example, from a lying on the same street side house, for example. From a bay window or from a Balcony viewed, is achieved by the longitudinal or facades parallel suppression a glare.

Depending on the geometric conditions on the surface to be illuminated, the blanking on the individual radiators can be designed differently. In conventional facades with façade heights of 10 to 20 m, the facade spotlights viewed in a vertical plane perpendicular to the facade can have a Ausblendbereich of more than 270 °, preferably about 270 ° to 280 °, wherein the non-hidden area at the upper end of the illuminated facade piece about directed at the facade at an angle of 90 °, while at the lower end of the illuminated facade piece of the non-hidden area with the facade an angle of preferably 3 ° to 10 ° can include. Also viewed in a horizontal plane perpendicular to the facade, the facet radiator can have a masking range of at least 200 °, preferably 240 ° or more, in particular about 240 ° to 270 °, which may depend on the LED spacing and the desired lighting effects such as color blends.

The arrangement of the facade spotlights relative to the facade or wall can basically be done in different ways. According to an advantageous embodiment of the invention, the facade spotlights can be arranged in an approximately horizontal row at the upper end of the facade piece to be illuminated, the facade spotlights of the facade can be arranged at a distance of about 0.5 to 2 m. With conventional facade heights of, for example, 15 m, a facade spotlight row can advantageously be arranged at a distance of about 1 m in front of the facade and illuminate the facade to the ground, ie about 15 m high. In an advantageous embodiment of the invention, the ratio of height of the facade or wall piece to be illuminated to facade spacing of the radiator 4: 1 or more, preferably 5: 1 or more, in particular 10: 1 or more, typically to be achieved in the Range from 5: 1 to 15: 1. Depending on the installation situation, said aspect ratio can not be determined by the height of the wall piece to be illuminated, but, for example, its width, namely, for example, when a wall of, for example, a long corridor is to be illuminated with laterally arranged radiators. Regularly, said ratio is determined by the extent of the illuminated patch in a direction perpendicular to the direction along which the plurality of emitters are usually strung, and the emitter spacing perpendicular to the surface to be illuminated.

In this case, the facade radiators or their reflectors, which are arranged closer to the edge of a façade surface, are advantageously designed with regard to their emission angles or skimming spaces in such a way as to prevent them from being emitted beyond the lateral end of the facade. In particular, they are to the edge of the facade arranged façade spotlights or their reflectors designed such that each of them lit facade piece laterally terminates approximately flush with the vertical facade edge. The illuminated space produced by the facade radiator strip, ie the entirety of the facade radiators, terminates flush with the right and left edge of the façade, or possibly even before, so that in each case it is ensured that no glare occurs on the adjoining building façade. The façade spotlights do not radiate beyond the edges of their associated façade surface.

In order to achieve the most uniform possible facade or wall lighting, the half-shell-shaped reflectors are contoured in an advantageous embodiment of the invention in particular such that each facade spotlights illuminates an approximately rectangular piece of facade and then generates an illuminance distribution along vertical lines over the entire façade height or Viewed total height of the illuminated facade or surface piece considered illuminance ratio of minimum illuminance E _min to maximum illuminance E _max of 1:10, ie, has 0.1 or greater. The illuminated façade piece does not have to go all the way to the floor, but can end a bit above or a certain transition area to the ground can be provided to avoid bright radiation edges on the floor - or an adjacent wall - which otherwise due to Assembly tolerances, but also the "radiation brush", which would be caused by the real extent of the mathematically not really punctiform light source at not arbitrarily positionable by the reflector light source, would occur.

Correspondingly, advantageously not only a vertical, but also a horizontal uniformity of the illuminance with a corresponding illuminance ratio is provided.

By said illuminance ratio over the entire facade or surface piece for the human eye more or less completely uniform facade or wall lighting can be achieved. By the With respect to an axis of rotation asymmetrical light intensity distribution on each facades emitters a very uniform facade or wall lighting can be achieved with wide glare freedom overall.

Even though the mentioned illuminance ratio of 1:10 already yields beautifully uniform facade lighting conditions, in a further development of the invention advantageously an illuminance ratio of minimum illuminance E _min to maximum illuminance E _max - when viewed along a vertical and / or horizontal lines over the entire facade height and / or width - of 1: 2.5, ie 0.4 or larger. As a result, more or less perfect evenly illuminated facades can be achieved, said illuminance ratio even with very close to the wall mounted radiators with the above ratios of radiator wall distance to extension, in particular height of the illuminated area piece of 1: 4 to 1:20 , in particular 1: 5 to 1:15 can be provided.

The reflectors of the facade heaters are advantageously asymmetrically formed in development of the invention that the illuminance distribution of a respective facade spotlight individually considered on the illuminated facade of this piece about halbovalförmige or slightly pear-shaped Isoluxen has, i. Lines along which the illuminance is the same. The course of these Isoluxen clearly determines the free-form surface of the reflector, which is associated with the light source. About the geometric conditions of the facade radiator assembly and the free-form surface of the reflector, a specific Isoluxenbild is generated, which characterizes the illumination intensity distribution on the illuminated facade piece, so that from the course of Isoluxen the reflector surface shape is uniquely determined in terms of their geometry.

By virtue of the abovementioned semi-oval or U-shaped Isolux curve, in spite of the asymmetrical facade spotlight arrangement, ie in particular the arrangement of a row of facades at the upper end of the facade or wall piece to be illuminated, a façade lighting uniform to the human eye can be achieved be achieved when a plurality of facade spotlights are arranged in a row in parallel in front of the facade or wall.

Depending on the geometric conditions of the façade and the facade spotlight arrangement on the façade, i. In particular, the height and width of the façade as well as the distance of the facade spotlights from the facade as well as the number of facade spotlights in a row, the mentioned isoluxes can be fundamentally differently contoured. In order to achieve a particularly uniform facade lighting, however, it is provided in a further development of the invention that said oval or semi-oval isoluxes of the façade piece illuminated by a facade spotlight have a ratio of height to width of at least 2: 1, wherein said ratio is advantageously also 3 : 1 or 4: 1 can be. Due to the generally elongated, slim design of the Isoluxen over the height of the facade at least approximately constant illuminance can be achieved.

In an advantageous embodiment of the invention, the light sources can each be mounted on a support arm which protrudes from an edge of the respective reflector over its opening cross-section, wherein the light sources are respectively arranged on the reflector side facing the respective support arm. Said support arm can be contoured oblong slim to block as little as possible surface for the throwing back of the light rays, for example, have the shape of a longitudinal ridge.

In particular, the said support arms, on which the light sources are arranged, may be part of a common printed circuit board which extends along the row of radiators and in the region of the reflectors each have a reflector notch preferably adapted to the reflector contour, the edge of which surrounds the respective reflector and through through which the reflectors can throw the captured light onto the façade or wall piece. In principle, each facade spotlight can be assigned its own printed circuit board, although all or some of the facade spotlights also have a common printed circuit board along which the light sources are lined up to form a common band of light.

Fig. 1:

eine perspektivische, schematische Darstellung eines im Wesentlichen kubischen Gebäudes, bei dem die zwei zu sehenden Fassaden mit einer Fassadenbeleuchtungsvorrichtung umfassend eine Vielzahl von in Reihe angeordneten Fassadenstrahlern zugeordnet ist,

Fig. 2:

eine perspektivische, schematische und vergrößerte Ansicht einer Fassadenstrahlerreihe, die am oberen Ende der zu beleuchtenden Fassade von dieser beabstandet angeordnet ist, wobei die Fassadenstrahler nach Art eines Lichtbandes ausgebildet sind und eine Vielzahl von nebeneinander angeordneten LED-Lichtquellen umfassen,

Fig. 3:

eine schematische Darstellung der Anordnung der Fassadenstrahler in einem Aufriss parallel zur beleuchtenden Fassade sowie eine grafische Darstellung der Beleuchtungsstärkeverteilung über die Fassadenhöhe, die von dem Lichtband erzeugt wird,

Fig. 4:

eine schematische, perspektivische Darstellung der Ausstrahlcharakteristik eines einzelnen Fassadenstrahlers umfassend ein LED, die die klaren Abrisskanten des beleuchteten Fassadenstücks und die rechteckige Form des beleuchteten Fassadenstücks zeigt,

Fig. 5:

eine perspektivische, schematische Darstellung der Ausstrahlcharakteristik mehrerer nebeneinander angeordneter LEDs der Fassadenbeleuchtungsvorrichtung aus den vorhergehenden Figuren, die die Überblendung der Ausstrahlbereiche zeigt,

Fig. 6:

eine Darstellung der Überblendungsverhältnisse in einer fassadenparallelen Draufsicht,

Fig. 7:

eine perspektivische Ansicht eines Fassadenstrahlers der Beleuchtungsvorrichtung nach einer vorteilhaften Ausführung der Erfindung, die die Anordnung einer LED auf einer Leiterplatte und den zugeordneten Reflektor in einer Anordnung innerhalb eines rohrförmigen Gehäuses mit einer schlitzförmigen Austrittsöffnung zeigt,

Fig. 8:

eine schematische Schnittansicht des Fassadenstrahlers aus Fig. 8 in einer Einbausituation,

Fig. 9:

eine perspektivische Darstellung des Reflektors eines Strahlers nach einer vorteilhaften Ausführung der Erfindung, wobei in der Teilansicht (a) die Rückseite und in der Teilansicht (b) die Reflexionsseite des Reflektors dargestellt sind,

Fig. 10:

eine schematische Darstellung des Reflektors aus Fig. 9, wobei die Teilansicht (a) eine Draufsicht, die Teilansicht (b) eine Schnittansicht entlang der Linie H-H in der Teilansicht (a) und die Teilansicht (c) einen Schnitt entlang der Linie G-G in der Teilansicht (a) zeigt,

Fig. 11:

eine schematische Darstellung des von dem Reflektor erzeugten Strahlengangs, wobei die Teilansicht (a) den erzeugten Strahlengang in einer vertikalen Ebene und die Teilansicht (b) den erzeugten Strahlengang in einer horizontalen Ebene zeigt,

Fig. 12:

eine grafische Darstellung der von der Beleuchtungsvorrichtung erzeugten Beleuchtungsstärke über der Fassadenhöhe mit einem Beleuchtungsstärkeverhältnis von minimaler Beleuchtungsstärke E_min zu maximaler Beleuchtungsstärke E_max von 1:10,

Fig. 13:

eine grafische Darstellung der Beleuchtungsstärkeverteilung in einem von einer Einzel-LED beleuchteten, rechteckigen Fassadenstück, in der die Isolux-Linien, d.h. die Linien, entlang derer die Beleuchtungsstärke gleich bleibt, eingetragen sind und etwa halbovalförmig sind, und

Fig. 14:

eine schematische, perspektivische Draufsicht auf den Reflektor eines Strahlers nach einer weiteren vorteilhaften Ausführung der Erfindung, gemäß der die Reflektorflächen mit einer Vielzahl von Facetten versehen sind.

The invention will be explained in more detail with reference to preferred embodiments and associated drawings. In the drawings show:

Fig. 1:

a perspective, schematic representation of a substantially cubic building, in which the two facing facades with a facade lighting device is associated with a plurality of arranged in series facade radiators,

Fig. 2:

a perspective, schematic and enlarged view of a facade radiator array, which is arranged at the upper end of the facade to be illuminated spaced therefrom, wherein the facade radiators are formed in the manner of a light band and comprise a plurality of juxtaposed LED light sources,

3:

a schematic representation of the arrangement of the facade spotlights in an elevation parallel to the illuminating facade and a graphic representation of the illumination intensity distribution over the facade height, which is generated by the light band,

4:

a schematic perspective view of the Ausstrahlcharakteristik a single facade spotlight comprising an LED showing the clear edges of the demolished facade piece piece and the rectangular shape of the illuminated facade piece,

Fig. 5:

a perspective, schematic representation of the Ausstrahlcharakteristik several juxtaposed LEDs of the facade lighting device of the preceding figures, which shows the blending of the Ausstrahlbereiche,

Fig. 6:

a representation of the blending ratios in a façade-parallel plan view,

Fig. 7:

a perspective view of a facade radiator of the lighting device according to an advantageous embodiment of the invention, showing the arrangement of an LED on a circuit board and the associated reflector in an arrangement within a tubular housing with a slot-shaped outlet opening,

Fig. 8:

a schematic sectional view of the facade radiator Fig. 8 in a mounting situation,

Fig. 9:

a perspective view of the reflector of a radiator according to an advantageous embodiment of the invention, wherein in the partial view (a) the back and in the partial view (b) the reflection side of the reflector are shown,

Fig. 10:

a schematic representation of the reflector Fig. 9 , wherein the partial view (a) is a plan view, the partial view (b) a sectional view along the line HH in the partial view (a) and the partial view (c) shows a section along the line GG in the partial view (a),

Fig. 11:

a schematic representation of the beam path generated by the reflector, wherein the partial view (a) shows the generated beam path in a vertical plane and the partial view (b) the generated beam path in a horizontal plane,

Fig. 12:

a graphical representation of the illuminance generated by the lighting device above the facade height with a illuminance ratio of minimum illuminance E _min to maximum illuminance E _max of 1:10,

Fig. 13:

a graphical representation of the illuminance distribution in a illuminated by a single LED, rectangular facade piece in which the Isolux lines, ie the lines along which the illuminance remains the same, are registered and about halbovalförmig, and

Fig. 14:

a schematic, perspective top view of the reflector of a radiator according to a further advantageous embodiment of the invention, according to which the reflector surfaces are provided with a plurality of facets.

The facade lighting device 1 shown in the figures comprises, in front of each facade 2, 3 of the building 4, a light band 5 which is arranged substantially horizontally approximately parallel to the façade, approximately at the upper end of the respective façade 2 and 3 Facade is wide or slightly shorter.

Each light band 5 comprises a plurality of facade radiators 6, each comprising a point-shaped light source in the form of an LED 7 and a LED 7 associated reflector 8, as this Fig. 7 shows. The LEDs 7 can in this case be arranged on a light source carrier 9, which can be advantageously designed as an LED board, and pivotally mounted about a horizontal axis, so that the radiation angle of the respective facade radiator 6 with respect to the facade 2 and 3 can be adjusted. Alternatively or additionally, the reflector 8 may be pivotally mounted together with the LED 7. The light source together with the optics in the form of the reflector 8 can advantageously be arranged in an approximately tubular housing 10, which has a slot-shaped emission opening, which can be closed with a cover glass in order to avoid contamination of the optics. Instead of the rectangular cross section, the housing 10 may also have other cross sections, for example, round tube cross sections.

As FIG. 8 shows, cf. There, the dashed representation of the housing wall 10a, the housing 10 can also act as a panel and in the plane of constrictions 50 of the reflected Lichtpyramiden hole or slot-shaped light passage openings 51 have, but otherwise be formed closed.

As Fig. 7 shows the light source or LED 7 may be attached to a support arm 9a, which forms part of the aforementioned light source carrier board 9 and extending from the edge of the associated reflector 8 and protrudes into the opening cross section 8q of the reflector 8. Accordingly, the LED 7 disposed on said support arm 9a is approximately disposed in the plane defined by the edges of the reflector 8, the LED 7 being within the space enclosed by said reflector edge.

Said light source carrier board 9 advantageously comprises a reflector recess 9b, which is adapted to the peripheral contour of the reflector 8, so that the reflector 8 is encompassed by said recess. Advantageously, the reflector 8 may also be mounted or fastened to the light source carrier board 9, in particular such that at least part of the reflector rim is seated on the light source carrier board 9 or extends directly over or on the carrier board 9, wherein optionally fastening means may be provided, for example in the form of the illustrated retaining pins.

As Fig. 2 shows, in the illustrated embodiment, the light band 5 is arranged at a facade height of 15 m at a distance of about 1 m in front of the facade. The distance between the LEDs 7 in the light band 5 from each other can be chosen fundamentally different, advantageously a more or less seamless stringing as many LEDs is provided as this high brightness can be achieved on the facade with LEDs of low strength.

As Fig. 4 shows, the LEDs or emitters each individually radiate no rotationally symmetric beam of light. Rather, it is due to the contouring the reflectors 8 of each LED 7 illuminates an approximately rectangular facade piece 12. The reflectors 8 can each be designed such that in each case an approximately rectangular, for example, about 15 m high and 3 m wide facade piece 12 of a single LED 7 according to Fig. 4 is illuminated. Viewed in a vertical plane perpendicular to the facade while the beam angle α is provided, which is approximately 87 ° in the illustrated embodiment and is oriented such that the upper edge of the Ausstrahlsektors is directed approximately perpendicular to the facade, while at the lower edge between the facade and the radiation area edge is provided an angle of about 3 °, cf. Fig. 3 , In the mentioned vertical plane, therefore, a blanking space of 360 ° - α is provided, cf. Fig. 3 , On the other hand, in a horizontal plane, also perpendicular to the facade, a region with the angle β is illuminated, cf. Fig. 4 which can vary depending on the distance between the façades and the LED density and, in an advantageous embodiment, can be about 2 × 45 ° to 2 × 60 °. Accordingly, a range of 360 ° -β is hidden in said horizontal plane.

By this fassadenparalle longitudinal suppression by the reflectors 8 a more or less complete glare freedom is achieved. If, for example, a viewer is standing in a plane parallel to the façade passing through the light band 5, he / she will not be dazzled, since the light intensity will approach zero at approximately 2 m above the ground in the plane parallel to the façade through the light band 5. Even if a person standing close to the building looks upwards, he does not even see the light source itself, even at a smaller distance from the facade, because it is hidden accordingly. Even a standing on the balcony of an adjacent house in the same street neighbor is not dazzled.

As the FIGS. 9 to 11 show, the desired light distribution is generated by correspondingly shaped reflectors, the contouring is shown in more detail in the aforementioned figures 9 to 11. Each of the reflectors 8 comprises a roughly spherical bowl-shaped reflector body having an approximately - roughly speaking - round or rounded edge contour from which the Reflector body dished bowl-shaped to one side, so that said edge contour defines the opening cross-section of the shell. More specifically, the shell-shaped reflector body is constituted by two shell halves 8a and 8b which are connected to each other and have between them a transition area in the form of a constriction 8c connecting the two shell halves 8a and 8b. As a result, the reflector 8 provides a total view of a double-pear-shaped or twin-jaw-shaped contouring, cf. Figures 9 and 10 ,

Said constriction 8c forms - when viewing the reflector surface forming shell inside - a ridge-shaped increase, which extends along the central longitudinal plane of the reflector 8. As the FIGS. 9 (a) and 10 (c) illustrate, the depth or height of the constriction 8c from one side of the reflector 9 to an opposite side slightly increases, in particular to the side that points in the installation situation to the surface to be illuminated, ie at above a facade to be illuminated arranged facade radiators lies down or forms the lower edge portion 8u of the reflector 8.

As Fig. 11 3, the shell halves 8a and 8b of the overall half-shell forming reflector 8 may be contoured such that the light captured by each shell half 8a and 8b is incident on the entire surface illuminated by the reflector 8, ie the patch 12 as shown in FIG Fig. 5 can be rectangular, is distributed. The beam paths of the two shell halves 8a and 8b are thus substantially completely superimposed, so that no light-dark lines or edges on the surface piece 12 to be illuminated occur.

As the FIGS. 11 (a) and 11 (b) make clear, the reflector 8 is contoured as a whole in such a way that the reflector rotates the beam path so to speak a mirror image. In particular, each of the shell halves 8a and 8b is designed to work in a double convergent manner. The beams deflected by an upper shell half rim 8o are directed to a lower edge area of the facade piece 12 to be illuminated, while those deflected by a lower shell half edge 8u Rays illuminate the upper edge region of the illuminated facade piece 12. Furthermore, a right edge portion of each shell half 8a and 8b illuminates a left edge portion of the facade piece 12, while the left shell edge 8l irradiates a right edge portion of the facade piece 12, see FIG. Figs. 11 (a) and 11 (b) ,

In an advantageous embodiment of the invention, the shell halves are each contoured so that a one-to-one assignment takes place, i. each point of the illuminated area 12 is illuminated by exactly one point of the shell half.

Due to the convergence of the beam path, on the one hand it can be achieved that, despite uniform illumination of the facade piece 12, the light of the light source 7 captured by the reflector 8 is directed completely around the light source 7, so that the light source 7 or its support arm 9a does not cast a shadow. On the other hand, a very cheap, space-saving installation situation can be realized, as they Fig. 8 shows. The generated beam is substantially completely below - or in lateral installation substantially completely laterally or at bottom mounting substantially completely discharged above the reflector 8, so that the reflector 8 and the entire facade spotlight 6 also under plaster or in an adjoining ceiling or adjoining cornice can be installed recessed. The illuminated by the respective facade spotlight 6 facade piece 12 thus remains free from occlusion by the facade spotlights itself, resulting in no obtrusive visual barriers on the illuminated wall or facade piece for the viewer.

In order to achieve efficient illumination, the reflector surfaces of the reflectors 8 can be highly reflective, advantageously have a reflectance of more than 80%, in particular more than 90%. Alternatively or additionally, the reflector surfaces may be slightly frosted to make the reflector less sensitive to manufacturing tolerances or to achieve the desired uniformity of illumination of the patch even with larger shape tolerances of the reflector.

Alternatively or additionally, the reflectors 8 may comprise filters and / or mirror layers, for example in order to filter the captured light with regard to specific wavelength ranges, for example in order to filter out melatonin light.

As Fig. 14 For example, the reflectors 8 may be provided with a surface structuring in the form of a faceting 80 comprising a plurality of facets 81 which may be distributed in a regular pattern over the entire reflector surface and substantially contiguous with each other so that substantially all of the facets will be present effective reflector surface is faceted. Advantageously, the facets 81 can be distributed in a plurality of rows and columns, both in the longitudinal direction and in the transverse direction of the reflector 8, for example in more than ten columns and ten rows per quarter shell. In this case, the facets 81 can be contoured differently, for example, approximately provided with rectangular circumferential constructions. The facet surface of a facet 81 itself can also be contoured differently, for example essentially flat or even slightly concave, for example in the sense of a shallow depression in the manner of the impression of a lens. Alternatively it is also possible to work with a geometrically irregular edge contouring of the surface structure partial surfaces, for example in the sense of cloud-shaped contoured micro-dents or an orange-peel structure, as obtainable for example by etching.

As Fig. 5 shows, the illuminated by an LED 7 and the associated reflectors 8 rectangular facade pieces 12 are superimposed, ie along a vertical strip overlap illuminated by one LED facade pieces. Are the LEDs at a distance from each other and at a distance of b from the facade arranged as the Figures 5 and 6 show, the illuminated facade pieces 12 overlap each other in a strip, since the width of the illuminated facade pieces 12 is greater than the distance a. The said overlap strip can be quite narrow, but also correspond to the entire facade piece 12, ie each radiator 6 can illuminate the entire facade piece 12.

Overall, this can be achieved by a very uniform facade lighting. As Fig. 3 shows, the illuminance of the light band 5 over the entire facade height only a very small variation. The minimum illuminance according to Fig. 3 occurs at the lower end of the facade, stands to the maximum illuminance E _max , in the range of about one-quarter to three-quarters of the facade height, in the drawn version according to Fig. 3 occurs at about three quarters of the facade height, in a ratio of 1:10 or more, ie preferably 1: 5 or 1: 2.5 or even larger.

As Fig. 1 shows, it has the Abstrahlraum the light band 5 lateral demolition edges, which are advantageously approximately flush with the edges of the facade, so that glare around the corner of the building 4 around is excluded.

The Figures 12 and 13 show advantageous distributions of illuminance. In Fig. 12 the course of the illuminance above the façade height is shown. Here, in the facade height "0", which corresponds to the height of the light band 5, given a relative illuminance of about 60%, which then rises up to about 6 m below the light band 5 out to about 100%, ie there reaches its maximum value , Up to the bottom of the façade, the lux number then drops again, with 10% of the maximum lux strength remaining on the floor. As a result, the ratio of minimum illuminance E _min to maximum illuminance E _max is defined as 1:10.

In such a luminous intensity distribution of the entire light band 5, the reflector 8 of a single facade radiator or a single LED 7 can be defined by an illuminance distribution in a further development of the invention, as they Fig. 13 shows. The named Fig. 13 shows the isoluxes, ie the lines along which the illuminance in the facade piece 12 illuminated by an LED is the same. It is on the vertical axis of the Fig. 13 the height of the facade, more precisely the height under the respective LED applied, while the horizontal axis indicates the width of the illuminated facade piece. As Fig. 13 shows, the Isoluxen thereby have a total of approximately halbovalförmige contouring or flattened on one end oval shape. In this case, the LED point 7 directly opposite façade point is, so to speak, the center of said Isoluxen. Starting from there, the isoluxes extend approximately oval-shaped or semi-oval or in the form of a one-sided, flattened on one end oval, with the highest illuminance indicating Isoluxe is in the center and is surrounded onion-shaped Isoluxen that indicate ever lower illuminance. The ratio of the longitudinal extent of the isoluxes in the vertical direction to the width of the isoluxes is more than 2: 1, ie the isoluxes are overall quite long and slender, cf. FIG. 13 ,

In a further development of the invention, the reflector 8 of one or more, possibly all emitters can be provided with a spectrum which changes the spectrum of the reflected light, so that the reflected light has a different spectrum than the light captured by the refractor and coming from the light source , As a result, for example, melatonin-promoting or suppressing light can be generated. Such a spectral-changing coating is particularly advantageous in connection with the only simple reflection of the entire captured or total light emitted from the light source at the reflector, so that the desired spectrum change is not falsified or not uncontrollable by multiple reflections.

Claims (14)

1. A spotlight for an illumination apparatus (1) for illuminating a surface portion of a façade, a wall, a ceiling or a floor surface, having a point-shaped light source (7), preferably in the form of an LED, and having a reflector (8) that is associated with the light source (7) and that substantially completely captures the light of the associated light source (7) and casts it onto the surface portion (12), that is in particular rectangular, wherein the reflector (8) is configured as simply reflective and the total light emitted by the light source (7) and captured is only reflected once, characterized in that the reflector (8) is formed by at least two shell halves (8a, 8b), of which shell-halves (8a, 8b) each is configured as reflective in a double-convergent manner and distributes the respective captured light by simple reflection over the total surface portion illuminated by the reflector (8), with a left marginal shell section (8l) of the shell half (8a, 8b) illuminating a right marginal section (12r) of the illuminated surface portion (12), a right marginal shell section (8r) of said shell half illuminating a left marginal section (12l) of the illuminated surface portion (12), a lower marginal shell section (8u) of said shell half illuminating an upper marginal section (12o) of the illuminated surface portion (12), and an upper marginal shell section (8o) illuminating a lower marginal section (12u) of the illuminated surface portion (12).
2. A spotlight in accordance with the preceding claim, wherein the reflector (8) is contoured such that the beams emanating from the light source (7) are transformed into approximately pyramid-shaped beams, with each shall half (8a, 8b) preferably being contoured such that the light of the light source (7) captured by the respective shell half (8a, 8b) is transformed into approximately pyramid-shaped beams, in particular slanted pyramid-shaped beams.
3. A spotlight in accordance with one of the preceding claims, wherein the light source (7) irradiates the light emitted by it substantially completely into a half-space remote from the surface portion to be illuminated and is arranged such that the half-space faces the reflector (8), with the reflector (8) of half-shell shape surrounding the light source (7) so much that said half-space is covered by the reflector (8).
4. A spotlight in accordance with one of the preceding claims, wherein the reflector (8) is provided with a coating varying the spectrum of the light.
5. A spotlight in accordance with one of the preceding claims, wherein the reflector (8) is contoured such that the beams irradiated by the plurality of shell halves (8a, 8b) have optical path constrictions (50) that are at least approximately disposed in a common plane, in particular at least approximately in the region of the opening cross-section of the reflector (8), and a diaphragm superposed on the reflector (8) is provided that has cut-outs, in particular slit-like or aperture-like light passage openings (51) in the region of the optical path constrictions, said diaphragm in particular being formed by a housing (10) that is preferably tubular and that is closed apart from said cut-outs.
6. An illumination apparatus having at least one row of spotlights (6) that are each configured in accordance with one of the claims 1 to 5 and that are arranged next to one another and spaced apart from the surface portion (2, 3) to be illuminated.
7. An illumination apparatus in accordance with the preceding claim, wherein the reflectors (8) are each contoured such that a lower marginal reflector section (8u) illuminates an upper marginal section (12o) of the illuminated façade portion (12) and an upper marginal reflector section (8o) illuminates a lower marginal section (12u) of the illuminated surface portion (12); and/or wherein a left marginal reflector section (8l) illuminates a right marginal section (12r) of the illuminated façade portion (12) and a right marginal reflector section (8r) illuminates a left marginal section (12l) of the illuminated surface portion (12).
8. An illumination apparatus in accordance with one of the preceding claims 6 to 7, wherein the light sources (7) irradiate the light emitted by them respectively substantially completely into a half-space mainly remote from the surface portion (12) to be illuminated and are arranged such that the half-space faces the reflector (8) and the reflectors (8) each direct the light captured by the associated light source (7) substantially completely past the light source (79 onto the illuminated surface portion (12), wherein each shell half (8a, 8b) of a reflector (8) that is of approximately half-shell shape, that substantially completely captures the light of the associated light source (7) and casts it onto a predefined surface portion (12) is configured as reflective in a double convergent manner such that the total captured light is substantially completely irradiated at different sides of the light source (7) past the light source, with a left marginal shell section (8l) of the shell half (8a, 8b) illuminating a right marginal section (12r) of the illuminated surface portion (12), a right marginal shell section (8r) of said shell half illuminating a left marginal section (12l) of the illuminated surface portion (12), a lower marginal shell section (8u) of said shell half illuminating an upper marginal section (12o) of the illuminated surface portion (12), and an upper marginal shell section (8o) illuminating a lower marginal section (12u) of the illuminated surface portion (12).
9. An illumination apparatus in accordance with one of the preceding claims 6 to 8, wherein the shell halves (8a, 8b) of a respective reflector (8) together form a half-shell of approximately double pear shape that has a constriction (8c) that is formed by the transition region of the two shell halves (8a, 8b) and is of approximately gap shape, with the constriction (8c) extending in a longitudinal center plane of the reflector (8) and/or extending in a plane perpendicular to the illuminated surface portion (12) and to the longitudinal direction along which the spotlights (6) are disposed in rows and/or extending in a vertical plane on an arrangement of the spotlights (6) in the region of the upper margin of the illuminated surface portion (12) and/or extending in a horizontal plane on an arrangement of the spotlights (6) at a lateral marginal region of the illuminated surface portion (12), with the light sources (7) each being arranged in the region of the opening cross-section (8q) of the associated reflector (8) within the spatial zone surrounded by the reflector margin, and with the light sources (7) each being arranged with respect to the constriction (8c) of the associated reflector (8) out of the reflector center offset to the side at which the constriction (8c) has a smaller depth.
10. An illumination apparatus in accordance with one of the preceding claims 6 to 9, wherein the reflectors (8) are at least partly provided with a facet design (80) that comprises a plurality of facets (81) at the reflector surface of the respective reflector (8), with the facet design (80) being provided at both shell halves (8a, 8b) of the respective reflector, in particular at the total reflector surface and/or comprising more than fifty, preferably more than a hundred facets (81) per shell half and/or comprising an approximately uniform distribution of the facets (81) in more than ten rows and columns in the longitudinal direction and transverse direction of the reflector surface and/or with at least a portion of the reflector surface of the reflectors (8) being provided with a geometrically irregular or regular microstructure design and/or orange peel design.
11. An illumination apparatus in accordance with one of the preceding claims 6 to 10, wherein the light sources (7) are each arranged on a support arm (9a) that projects starting from a margin of the reflector (8) over the opening cross-section (8q) of the reflector (8), with the light sources (7) each being arranged on the side of the respective support arm (9a) facing the reflector (8), with the support arm (9a) preferably being a part of a printed circuit board (9) that has a respective reflector cut-out (9b) which is preferably adapted to the peripheral reflector contour in the region of the reflectors (8), whose margin engages around the associated reflector (8) and through which the reflectors (8) cast the respective captured light onto the illuminated façade/wall portion (12).
12. An illumination apparatus in accordance with one of the preceding claims 6 to 11, wherein the spotlights (6) are arranged so closely surface portion to be illuminated, in particular the façade/wall/ceiling/floor portion (12), that the ratio b/h of the spotlight spacing (b) from the surface portion (12) to the longitudinal extent, in particular the height (h) or width, of the surface portion (12) amounts to 1:4 or less, preferably 1:5 or less, in particular 1:8 to 1:25, and the reflectors (8) generate an illuminance distribution that has an illuminance ratio of minimal illuminance (E_min) to maximum illuminance (E_max) of 1:10, i.e. 0.1 or more, in particular 1:2.5 or more, along said longitudinal extent, in particular the height (h), of the surface portion (12) of parallel lines over the total longitudinal extent of the illuminated surface portion, with the reflectors (8) being contoured such that the illuminance distribution over the illuminated façade/wall portion (12) has semi-oval isolux curves, with the semi-oval isolux curves preferably having a ratio of height to width of at least 2:1.
13. An illumination apparatus in accordance with one of the preceding claims 6 to 12, wherein the illuminated façade/wall portion (12) substantially extends from the floor up to the height of the row of spotlights (6) and/or the illuminated façade/wall portion (12) has an upper edge at approximately the level of the spotlight row and a lower edge at approximately the level of the floor and/or approximately a little beneath the spotlight row corresponding to four to twenty times the spacing of the spotlight row from the façade (2, 3), with the reflectors (8) being contoured around the associated light source (7) such that the spotlights (6) have a masking parallel with the façade and in parallel with the illuminated surface portion (12) and/or the luminosity tends toward zero in a plane that is in parallel with the surface portion (12) and that passes through the spotlight row in a region close to the floor and/or in a lateral region next to the illuminated surface portion (12), with the spotlights (6) each having a masking angle (360°-α) viewed in a vertical plane perpendicular to the façade/wall (2, 3) of more than 270°, preferably between 270° and 280° and having a masking angle (360°-ß) of more than 200°, preferably between 240° and 270°, in a horizontal plane perpendicular to the façade/wall (2, 3).
14. An illumination apparatus in accordance with one of the preceding claims 6 to 13, wherein the surface portions (12) illuminated by a respective spotlight (6) overlap one another.

Images