DE202017002850U1 - lighting system - Google Patents

Abstract

An illumination system (10) comprising: - an elongate channel-shaped lens (12) having a longitudinal center plane (X12), the lens having an inner surface (12a) and an outer surface (12b) defining a thickness of the lens (12) to one another; at least one linear array of electrically powered light radiation sources (L) extending in the channel shape of the lens (12) such that the light from these light radiation sources (L) propagates through the lens (12), starting from the lens (12) from the longitudinal center plane (X12) has a first increasing and then decreasing thickness.

Description

Technical area

The description refers to lighting techniques. One or more embodiments may relate to techniques for illuminating a surface having a particular illumination distribution, for example using solid state light radiation sources such as LED sources.

State of the art

For some applications, such as vegetable and / or horticultural applications, and possibly domestic applications, the use of solid-state lighting (SSL) may run counter to restrictions such as space limitations or limitations on the design of the lighting devices, e.g. B. when the lighting points for vertical plant cultivation should be distributed to console-like structures.

Incidentally, these applications, as well as other general lighting applications, may be subject to restrictions such as the need to contain costs while providing good light distribution on the illuminated surface.

In vegetable and horticultural applications, the use of light sources (eg LED) with different spectral properties is becoming increasingly important. In such a context z. B. conceivable to use N different types of LEDs, which should be summarized and independently controlled, z. B. to achieve a uniform light distribution for each LED type.

These problems can be addressed by (distributed) LED matrices with each z. For example, N different types of LED are used with a uniform illuminance obtained by using a single lens for each LED, i. H. by using a single optic (eg a reflector) for each cluster, so that a profiling of the light emission with respect to the target surface (which may be rectangular) is performed. The single cluster can then be duplicated and paired with other clusters to "cover" a larger area.

The use of individual lenses for each LED can entail disadvantages associated with the cost and complexity of planning, for example, when it comes to protection against the intrusion of external influences (for example, with an IP degree of protection). This may require that a cover member be used, which is associated with a reduction in efficiency, or relatively complex mechanical structures and / or arrangements may be used.

If a reflector is to be used in combination with a cluster, it may be more difficult to achieve the uniformity of the light radiation, e.g. B. if low-cost structures to be executed.

Presentation of the invention

Object of one or more embodiments is to overcome the above-mentioned disadvantages.

According to one or more embodiments, this object is achieved with a lighting system having the features of the following claims.

The claims are an integral part of the technical teaching disclosed herein in connection with the embodiments.

• – höhere Effizienz des Beleuchtungssystems dank der gleichmäßigen Verteilung der Lichtstrahlung, z. B. auf einer rechteckigen beleuchteten Fläche,
• – höhere Effizienz des Beleuchtungssystems, z. B. dank des Einsatzes einer Abdeckung in Form einer Extrusionslinse,
• – mögliche Eindämmung der Ausführungskosten, insbesondere wenn eine Extrusionslinse anstelle einer Spritzgusslinse verwendet wird,
• – Reduzierung der Kosten der mechanischen Bauteile dank der Möglichkeit, eine standardisierte mechanische Kopplung auszuführen, z. B. mit einer Extrusionslinse,
• – Eindämmung der Kosten für das Erreichen des Schutzes vor dem Eindringen äußerer Einflüsse (IP-Schutzart), auch hier durch Zurückgreifen auf die Modalitäten zur mechanischen Kopplung mit der Extrusionslinse,
• – Einschränkung der mit den Toleranzen verbundenen kritischen Aspekte, z. B. in Anbetracht der Tatsache, dass die vorherrschenden Toleranzfaktoren letztendlich auf die Richtung quer zur Extrusionslängsrichtung der Linse beschränkt sind.

One or more embodiments may enable one or more of the following advantages to be achieved:

• - higher efficiency of the lighting system thanks to the even distribution of light radiation, eg. On a rectangular illuminated surface,
• - higher efficiency of the lighting system, eg. Thanks to the use of a cover in the form of an extrusion lens,
• Possible containment of the execution costs, in particular if an extrusion lens is used instead of an injection-molded lens,
• - Reduce the cost of the mechanical components thanks to the possibility of performing a standardized mechanical coupling, eg. With an extrusion lens,
• - contain the costs of achieving protection against external influences (IP protection), again by resorting to the modalities of mechanical coupling with the extrusion lens,
• - limiting the critical aspects associated with the tolerances, e.g. B. in view of the fact that the prevailing tolerance factors are ultimately limited to the direction transverse to the extrusion longitudinal direction of the lens.

One or more embodiments will now be described by way of example and not limitation with reference to the accompanying figures; in these show:

1 FIG. 2 is a schematic illustration of a lighting system useable in one or more embodiments; FIG.

2 exemplary application modalities of such a lighting system,

the 3 and 4 possible aspects of embodiments,

5 likewise exemplarily possible use modalities of one or more embodiments and

the 6 and 7 Diagrams illustrating lighting configurations that may be obtained with one or more embodiments.

To clarify the presentation, the individual figures are not necessarily reproduced on the same scale.

In the following description, various specific details are set forth in order to provide a thorough understanding of various examples of embodiments as described. The embodiments may be obtained without one or more of the particular details or other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not illustrated or described in detail so as not to obscure the individual aspects of the embodiments.

It is to be understood by reference to "one embodiment" in the context of this specification that a particular shape, structure, or feature described in connection with the embodiment is included in at least one embodiment. Therefore, sentences such as "in one embodiment" that may appear in various places throughout this description are not necessarily to refer to exactly the same embodiment. In addition, particular embodiments, structures, or features in one or more embodiments may be combined in any suitable manner.

The references used herein are given for convenience only and therefore, they do not specify the scope or scope of the embodiments.

In the figures, the reference numeral 10 generally designates an illumination system that is suitable for illuminating a surface S with a desired illumination distribution. In the following it is assumed purely by way of example that this area is rectangular.

One or more embodiments are suitable for use in applications such as those mentioned in the introductory part of this specification, for example for lighting in vegetable growing and / or horticulture.

• – eine länglich geformte Linse 12, die sich in einer Längsrichtung erstreckt (beispielsweise durch eine Mittellängsebene X12 dargestellt), und
• – eine Beleuchtungsvorrichtung 14, umfassend ein Substrat 14a (zum Beispiel ein bandförmiges Substrat, das im Wesentlichen einer Leiterplatte – Printed Circuit Board oder PCB – gleichgesetzt werden kann), auf dem mindestens eine lineare Gruppe von elektrisch betriebenen Lichtstrahlungsquellen L angeordnet ist, wobei sich diese Gruppe in Längsrichtung in Bezug auf die Linse 12 erstreckt (d. h. in Richtung der Ebene X12; siehe beispielsweise die 3 und 4).

As in 1 can be seen, which can be considered as a cross section on an enlarged scale, such a system 10 in one or more embodiments include:

• - an elongated shaped lens 12 extending in a longitudinal direction (represented for example by a central longitudinal plane X12), and
• A lighting device 14 comprising a substrate 14a (For example, a ribbon-shaped substrate, which can be essentially equated to a printed circuit board or PCB), on which at least one linear group of electrically operated light radiation sources L is arranged, wherein this group in the longitudinal direction with respect to the lens 12 extends (ie in the direction of the plane X12, see for example the 3 and 4 ).

In one or more embodiments, the light radiation sources L may be solid-state sources, for example LED sources.

As in 1 can be seen, the lens can 12 in one or more embodiments have a channel-shaped - symmetrical or possibly asymmetrical - cross-section with (at least) one row of light sources L, which are inside the channel-shaped profile of the lens 12 is arranged.

In one or more embodiments, the lens may be 12 be a so-called "free form" lens.

By this term (literally "freeform") is meant lenses in which, also thanks to the manufacturing technology, one or more of the surfaces delimiting them may have an arbitrary shape (not necessarily spherical or aspheric) which in general is not even symmetrical to an axis or level is.

This allows, for example, better control of the distribution of light radiation, both angular and on a plane or curved surface of arbitrary shape.

As far as this invention is concerned, the lens 12 depending on the ability to give it a desired one both in terms of the outer surface and the inner surface Giving shape to be regarded as a lens of this type.

• – eine Innenoberfläche (12a) mit mindestens annähernd zylindrischem Profil (d. h. dass sie sich über einen Oberflächenabschnitt erstreckt, der sich, entlang einer Querebene senkrecht zur Längsebene X12 geschnitten, entlang eines Kreisbogens erstreckt) und
• – eine Außenoberfläche (12b) mit mindestens annähernd elliptischem Profil (d. h. dass sie sich über einen Oberflächenabschnitt erstreckt, der sich, entlang einer Querebene senkrecht zur Längsebene X12 geschnitten, entlang eines Ellipsenbogens erstreckt).

1 For example, by way of example and not limitation, reference is made to embodiments in which the lens 12 (In the context of a general channel-shaped profile - for example, in a transverse plane X120 found perpendicular to the longitudinal plane X12 - see, for example, the 3 and 4 ) can have:

• - an inner surface ( 12a ) having at least approximately cylindrical profile (ie, extending over a surface portion extending along a transverse plane perpendicular to the longitudinal plane X12, extending along a circular arc) and
• - an outer surface ( 12b ) having at least approximately elliptical profile (ie, extending over a surface portion extending along a transverse plane perpendicular to the longitudinal plane X12, extending along an elliptical arc).

All this gives the lens a cross profile that (look 1 , which shows an example of a transverse profile symmetrical with respect to the longitudinal plane X12), starting from the longitudinal plane X12 has a first increasing and then decreasing thickness.

In one or more embodiments, it is possible to use the surfaces 12a . 12b the lens in the form of two-dimensional free-form profiles, which are adapted to be optimized, for example, to obtain a uniform illuminance distribution on the surface S, that of the lens 12 is opposite, for example, at a certain distance from it perpendicular to the optical axis of the source L, which is assumed to be z. B. in the middle, that is arranged in the median plane X12.

In one or more embodiments, the lens is suitable 12 to be carried out of a material permeable to the light radiation emitted by the sources L, for example a transparent plastic. Examples of such for the execution of the lens 12 usable materials are polycarbonate or polymethylmethacrylate.

By way of example only (thus, without any intent to limit the scope of the embodiments), a lens may be used 12 as they are in 1 is shown, a transverse width (in the horizontal direction with respect to 1 ) of the order of 18 mm at a height (measured in the vertical direction with respect to 1 ie in the plane X12) of the order of 10 mm.

Also illustrative may be the lens 12 have a length of the order of 500 mm and are intended to be placed at a distance of the order of 180 mm from an area S having dimensions of the order of 400-500 mm edge length (for example a rectangular shape of 460 mm × 500 mm).

As already stated, these quantitative details are by no means to be understood as limiting the scope of the embodiments; They are referred to purely as a guideline for possible use, for example in vegetable growing and / or horticulture.

In one or more embodiments (as in 1 shown), the light radiation sources L in the interior of the channel-shaped profile of the lens 12 be arranged and thus of the (inner) surface 12a the lens 12 through an airspace 16 be separated.

In one or more embodiments, it is, if - according to the principles of optics - with the profile of one or both surfaces 12a . 12b possible, that of the system 10 emitted light radiation configuration to give a desired profile (cross profile).

In one or more embodiments, the lens may be 12 (which may be extruded, for example) lead to a cylindrically symmetrical distribution of the optical power.

• – in einer Ebene quer zum System 10 und somit zur Linse 12, z. B. in der Ebene X120 der 3 und 4: Diagramm D120 mit durchgezogener Linie in 6; und
• – in einer Ebene längs zum System 10 und somit zur Linse 12, z. B. in der Ebene X12 der 3 und 4: Diagramm D12 mit gestrichelter Linie in 6.

The diagram in 6 shows an example of such a determined power distribution (for a single source L):

• - in a plane across the system 10 and thus to the lens 12 , z. In level X120 of 3 and 4 Diagram D120 with solid line in 6 ; and
• - in one plane along the system 10 and thus to the lens 12 , z. B. in the plane X12 of 3 and 4 : Diagram D12 with dashed line in 6 ,

Like the diagram D12 in 6 illustrates the distribution of the light radiation generated by the individual source L in the longitudinal direction, ie in the direction of extension of the lens 12 to be regarded as essentially Lambertian since the lens 12 does not exercise its effect in this direction.

In one or more embodiments, it is when looking at the profile of the lens 12 works (for example, by looking at the shape of the surfaces 12a . 12b acts according to the previously discussed modalities, e.g. B. with a transverse profile, starting from the central longitudinal plane X12 a first having increasing and then decreasing thickness), possible "transverse" distributions (Diagram D120 in FIG 6 ) of different nature, for example so that they have an emission profile of the light radiation (detected in the planes transverse to the longitudinal extension direction of the lens 12 ), for example peaks at values around 50 ° with respect to the center plane X12 (vertically according to the point of view of FIG 1 ) having a course which decreases monotonically towards the center plane (angle 0 °) or towards higher angle values (for example 90 °).

All this, for example, after a course that can be described as "moth-like".

One or more embodiments may provide that in the distribution of the light radiation sources L in the direction of the length of the lens 12 (and thus the lighting device 14 ) is intervened.

3 shows, for example, embodiments in which the light radiation sources L unevenly along the lens 12 are distributed, z. B. sparse (ie, at relatively large intervals) in the central region of the lens 12 and closer to the ends of the lens 12 ,

In one or more embodiments, the distribution of sources L may be as in FIG 3 with respect to an ideal center plane (longitudinal direction) of the lens 12 be mirror-symmetric. In the in 3 The solution shown has three groups of sources, with a first group in the middle position and two groups at the ends.

In one or more embodiments, however, sources L may be as in FIG 4 shown with regular increment (constant distance) along the longitudinal development of the lens 12 be distributed.

In one or more embodiments, it is possible to provide that the mounting of the sources L to the lighting device 14 can be made selectively adjustable, for example, by providing that the sources L, as in 1 shown schematically, displaceable along a guide 140 with which the carrier 14a is fitted, mounted. In this way, the sources L along the carrier 14a be shifted according to the application requirements and, for example, by a mounting arrangement, as shown in 3 is shown, to a mounting arrangement, as in 4 is displayed, change (after adding further sources L).

In one or more embodiments, such variation may be enabled by contacting the wearer 14a a certain (even quite high) number of mounting seats for the sources L is provided, the sources L can be mounted in such a number and at such positions that a desired mounting arrangement is obtained, in which case z. B. a non-uniform distribution as in 3 represented to a uniform distribution as in 4 can be changed shown.

In this way, it is possible, for example, to adjust the uniformity of the light radiation projected onto the surface S and / or its color (for example by using different types of sources L), without the shape of the lens 12 to change.

In one or more embodiments, it is possible to differentiate the light radiation sources L by providing the use of light radiation sources L which differ from each other by parameters such as the emission spectrum, the color point, the luminous flux value or the radiation configuration.

The distribution of light sources of different types along the lens 12 (ie along the lighting device 14 and thus the system 10 ) can be done both randomly and deterministically, for example, by choosing distributions that are suitable for carrying out certain color and luminous flux combinations, for example in order to achieve a uniform illumination of the surface S.

For example, assuming four different LED types, LED 1, LED 2, LED 3, and LED 4, are available, it is conceivable to route this LED along the device 14 in a cyclically repeating sequence of the type LED 1, LED 2, LED 3, LED 4, ..., LED 1, LED 2, LED 3, LED 4, etc. to distribute.

As in 5 In one or more embodiments, it is possible to have two or more lighting systems 10 to use the previously shown kind.

In one or more embodiments, these structures may be integrated into a single lighting system. This can be done by either the presence of several separate lighting devices 14 with corresponding associated lenses 12 (as in 5 shown) or possibly the presence of multiple lighting devices 14 that with a single lens 12 coupled, for example, with two linear rows of light sources L, the next to each other inside in the channel shape of the lens 12 are arranged, is provided.

Also in this case it is independent of the specific solution chosen to improve the uniformity of the transverse distribution of the light radiation (eg level X120 of FIG 3 and 4 ) it is possible to use light-radiation sources L of different types or light-radiation sources distributed in different orders or distributed in the same sequence but offset in the two adjacent rows.

In one or more embodiments it is possible, as shown here, on the transverse profile of the lens 12 (Surfaces 12a and 12b ) to change the emission pattern of the light radiation from the series of sources L, so that the illuminance on the surface S in certain areas is improved, for example by adjusting the position of the lateral peaks from an angle of 50 ° to an angle of 30 ° or less is changed or by a displacement of the tip (also by acting on the characteristics of the lens 12 ) is provided from an angle of 50 ° to an angle of 60 ° or more, so that, for example, walls that are laterally to the surface S, can be partially illuminated.

In vegetable growing and / or horticultural applications, this possibility may facilitate the improvement of the light distribution not only on the surface S (floor) but also on plants that have already grown and are intended to grow longer in the growth chamber (lateral projection). Greenhouse).

In one or more embodiments, it is (eg, by acting on the features of the lens 12 ) so intervene that an emission distribution with asymmetrical features (also transversely to the lens 20 ), so that, for example, brighter illumination on one side or flank and less bright illumination in the opposite direction is obtained.

The diagram in 7 shows z. For example, a cross-directional beam pattern D120 having two peaks that are approximately oppositely oriented (approximately ± 60 °) at an angle but having asymmetric intensities may have a first more pronounced peak (to the right in the diagram) facing the ground and a less pronounced one second tip (left in the diagram) could be directed towards a wall.

An asymmetric emission profile of the light radiation may be advantageous, as it enables a reduction of illuminance in a direction in which it is not needed (for example towards the side walls and / or to an adjacent row of light radiation sources, perhaps even at close range ), while increasing the illuminance and uniformity of propagation on the floor or in other directions.

The fact that possibly two (or possibly more than two) linear rows of light radiation sources may be used may facilitate obtaining a uniform illumination distribution over the entire area S. This approach may be useful in those situations where the luminous flux obtained with a single row of light sources is not sufficient, e.g. B. on the floor to obtain a desired luminous flux, so that for the use of multiple linear rows, for example, two adjacent linear rows as in 5 is opted for.

In one or more embodiments (such as in the sectional view of FIG 1 recognizable) can the lens 12 more than just an optical function are transmitted, z. When appropriate, mechanical functions for connection to the carrier or substrate 14a the lighting device 14 to take over.

In one or more embodiments, it is possible in the lens 12 , z. B. at the interface 12c to the substrate 14a To provide for training such as superficial profiles, gaskets etc. that are suitable for connection to the substrate 14a perform so that the lighting system 10 overall resistant to external influences (eg with IP degree of protection).

In one or more embodiments, the lens may be 12 be used as a carrier for mounting additional components (resistors, integrated circuits, etc.), which are combined with the light source L and possibly mounted in SMD technology.

That way, the lens can 12 For example, as a housing or cover for the system 10 act altogether.

This makes it possible (also thanks to the reduction in the number of components to be mounted), the cost of the system 10 and, moreover, to increase its efficiency (for example, thanks to the presence of a single optical element - the lens itself) 12 - between the light sources L and the outside environment).

In one or more embodiments, the lens may be 12 (on the inner surface and / or outer surface), for example with a coating capable of increasing its efficiency (eg, with an antireflective coating) and / or rendering its outer surface more resistant and scratch-resistant or solvent-resistant.

One or more embodiments may include the design of the lens 12 provide with an extrusion process.

In one or more embodiments, the lens may be 12 be carried out with other techniques, for example by injection molding. In the case of manufacturing techniques such as molding (eg, injection molding), it is possible to affect the length of the lens L so that it does not necessarily have a constant and uniform transverse profile as in the case of extrusion molding. In particular, it is possible in one or more embodiments, on the longitudinal profile of the profile of the inner surface 12a and / or outer surface 12b the lens 12 to act, for example, by cavities and / or projections are performed at the mounting positions of the light radiation sources L, in this way a profiling of the configuration of the system 10 emitted light radiation not only in the planes transverse to the longitudinal extent of the lens 20 but also in the longitudinal direction of the lens 20 itself can be made, with which (also) on the diagram D12 the 6 can be acted upon.

• – eine längliche kanalförmige Linse (z. B. 12) mit einer Längsmittelebene (z. B. X12), wobei die Linse eine Innenoberfläche (z. B. 12a) und eine Außenoberfläche (z. B. 12b) aufweist, die untereinander eine Dicke der Linse definieren,
• – mindestens eine lineare Reihe von elektrisch betriebenen Lichtstrahlungsquellen (z. B. L), die sich in der Kanalform der Linse erstrecken, so dass sich das Licht dieser Lichtstrahlungsquellen durch die Linse hindurch ausbreitet, wobei die Linse ausgehend von der Längsmittelebene eine erst zunehmende und dann abnehmende Dicke aufweist.

One or more embodiments may therefore include a lighting system (eg. 10 ), which comprises:

• An elongate channel-shaped lens (e.g. 12 ) having a median longitudinal plane (eg X12), the lens having an inner surface (e.g. 12a ) and an outer surface (e.g. 12b ) which define a thickness of the lens with each other,
• At least one linear array of electrically operated sources of light radiation (eg L) extending in the channel shape of the lens so that the light from these sources of radiation propagates through the lens, the lens being first increasing and decreasing from the longitudinal median plane then decreasing thickness.

In one or more embodiments, such a device may thus emit a "moth-like" lighting configuration, with e.g. B. two lateral peaks at an angle ± α (where α is eg 50, 30 or 60 °).

In one or more embodiments, the lens may have a (mirror) symmetrical cross-section transverse to this longitudinal plane such that the longitudinal plane represents a median plane of the lens and the emitted illumination configuration may be correspondingly symmetrical.

In one or more embodiments, the lens may have an asymmetrical cross-section transverse to the longitudinal plane such that the illumination configuration may be correspondingly asymmetrical.

• – eine Innenoberfläche mit annähernd zylindrischem Profil und
• – eine Außenoberfläche mit annähernd elliptischem Profil.

In one or more embodiments, the lens may include:

• - An inner surface with approximately cylindrical profile and
• - An outer surface with approximately elliptical profile.

In one or more embodiments, the arrangement of the light radiation sources in the at least one row may be selectively variable.

In one or more embodiments, the lens may have a cross section that varies in the direction of the median longitudinal plane.

In one or more embodiments, the light radiation sources may include LED sources.

• – das Bereitstellen mindestens eines Beleuchtungssystems gemäß einer oder mehreren Ausführungsformen,
• – das Platzieren des mindestens einen Beleuchtungssystems gegenüber der Fläche, so dass das Licht der Lichtstrahlungsquellen, das sich durch die Linse hindurch ausbreitet, diese Fläche beleuchtet.

In one or more embodiments, a method of performing an illumination distribution on a surface (eg, S) may include:

• Providing at least one lighting system according to one or more embodiments,
• Placing the at least one illumination system opposite the surface such that the light from the light radiation sources propagating through the lens illuminates that surface.

In one or more embodiments, it is possible to adjust the arrangement of the light radiation sources (L) in the at least one row.

• – a) ungleichmäßiges Beabstanden der Lichtstrahlungsquellen in Richtung der Länge der mindestens einen Reihe, optional mit einem größeren Abstand in der Mitte als an den Enden der mindestens einen Reihe, und/oder
• – b) Ausstatten der mindestens einen Reihe, bevorzugt in einer über die Länge der Reihe wiederholten Folge, mit mindestens zwei Typen von Lichtstrahlungsquellen, die sich voneinander durch mindestens einen der folgenden Parameter unterscheiden: – Emissionsspektrum, – Farbpunkt, – Lichtstrom und – Strahlungskonfiguration.

In one or more embodiments, adjusting the arrangement of the light radiation sources in the at least one row may include at least one of the following operations:

• A) non-uniform spacing of the light radiation sources in the direction of the length of the at least one row, optionally with a greater distance in the center than at the ends of the at least one row, and / or
• B) providing at least one row, preferably in a sequence repeated along the length of the row, with at least two types of light radiation sources which differ from each other by at least one of the following parameters: emission spectrum, color point, luminous flux and radiation configuration.

One or more embodiments may include providing at least two linear rows with light radiation sources extending in the direction of the longitudinal plane (possibly as separate illumination systems 10 ) and each capable of emitting an asymmetrical lighting configuration.

Notwithstanding the basic principle, the embodiments and the embodiments may vary, also considerably, from those described and shown here by way of example and not limitation, without departing from the scope of the invention.

This scope is determined by the following claims.

Claims (6)

Lighting system ( 10 ), comprising: - an elongated channel-shaped lens ( 12 ) having a median longitudinal plane (X12), the lens having an inner surface (X12). 12a ) and an outer surface ( 12b ) having a thickness of the lens ( 12 ), - at least one linear array of electrically operated light sources (L) located in the channel shape of the lens ( 12 ), so that the light of these light sources (L) through the lens ( 12 ), whereby the lens ( 12 ) starting from the longitudinal center plane (X12) has a first increasing and then decreasing thickness. Lighting system ( 10 ) according to claim 1, wherein the lens has a symmetrical cross-section transverse to the longitudinal plane (X12). Lighting system ( 10 ) according to claim 1 or claim 2, wherein the lens ( 12 ): - an inner surface ( 12a ) with an approximately cylindrical profile and - an outer surface ( 12b ) with an approximately elliptical profile. Lighting system ( 10 ) according to any one of the preceding claims, comprising an array of the light radiation sources (L) in the at least one row, which is selectively variable. Lighting system ( 10 ) according to any one of the preceding claims, wherein the lens ( 12 ) has a cross section which varies in the direction of the longitudinal center plane (X12). Lighting system ( 10 ) according to any one of the preceding claims, wherein the light radiation sources (L) comprise LED sources.

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