EP2039985B1 - LED lighting device with asymmetric light distribution, in particular for street lighting - Google Patents

Description

The invention relates to the field of illumination devices whose light source is formed by a light emitting diode, short LED, and in particular an LED illumination device with an asymmetrical light distribution curve.

An illumination system with an LED element and a lighting lens in the form of a lens is in the DE 101 58 395 A1 disclosed. In order to produce the most uniform possible illumination on a curved surface, the lens is provided according to this document provided with asymmetrical curved entrance and exit surfaces. The light emitted by the LED element is deflected asymmetrically with respect to the main emission direction of the LED element in order to illuminate a curved surface as evenly as possible.

Although it is due to the in the DE 101 58 395 A1 disclosed lighting device is possible to redirect the light emitted from the LED element light in a desired direction, so this illumination optics is only suitable for uniform illumination of relatively simple shaped surfaces. For more complex lighting task, the skilled person would have to provide a plurality of such lighting devices that emit light in different directions with a particular desired intensity light.

DE 103 14 254 A1 discloses a lamp for vehicles, especially for motor vehicles. A light guide element, which has a light exit surface and a reflector surface opposite the first longitudinal side on a first longitudinal side, is provided to deflect light of an LED laterally in a direction toward the main emission direction of the LED. In the light guide element, light radiation is partially coupled out directly through the light exit surface and partially deflected beforehand by total reflection.

The object of the invention is to provide an LED lighting device which is also suitable for complex lighting tasks.

The invention provides a street lamp with a plurality of LED lighting devices, each comprising at least one LED with respect to a main emission of the LED preferably rotationally symmetric light output and a light guide body, which is formed of a light guide and has at least one light exit surface, wherein light of the LED in the Lichtlenkkörper is coupled and at least a portion of the light is deflected in the light guide body that it leaves the light guide body through the light exit surface with a light distribution which is asymmetrical with respect to the main emission of the LED, the light distribution in a sectional plane in which the main emission of the LED and which intersects the light exit surface, a light distribution curve defined, which has a main maximum and at least one secondary maximum, wherein the main maximum is asymmetrical with respect to the main emission direction of the LED.

The light-guiding bodies are, for example, a full-thickness conductor which is formed entirely from a transparent material. In an alternative embodiment, a hollow light guide is possible. The fiber optic conductor is for example made of a transparent Material such as glass or plastic, eg PMMA, PU or PC, formed. The light steering in the light-guiding body is effected by refraction and / or by reflection. In the case of the full-light guide, in particular total reflection at selected interfaces is also possible. Alternatively, interfaces may also be mirrored to produce a reflection.

According to the invention, a main maximum of the light distribution curve is arranged asymmetrically with respect to the main emission direction of the LED. The main maximum produces the necessary luminance (measured in cd / m ² ) or illuminance (measured in lx) on a surface to be illuminated, while the secondary maximum is directed to other spatial areas to improve the uniformity of the luminance or illuminance. As a result of the asymmetrical main maximum, the LED lighting devices for a given lighting task can be set individually by aligning, with the alignment being able to take place by rotating the LED lighting device in the axis of the main emission direction of the LED. The secondary maximum serves to even out the luminance in the spatial regions that are not reached by the main maximum of the luminous intensity distribution. It can be generated by the at least one secondary maximum and light accents independent of the main maximum of the light distribution curve. In a simplified embodiment of the LED illumination device, no secondary maximum is provided in the light distribution curve.

According to one embodiment, the main maximum lies in the sectional plane in which the axis of the main emission direction of the LED is perpendicular and which intersects the light exit window perpendicular to the LED main emission direction in an angle range between 45 ° and 80 °, preferably between 55 ° and 75 °. The secondary maximum is preferably in the cutting plane with respect to the LED main emission direction in an angle range between -30 ° and 30 °, particularly preferably between -20 ° and 20 °. While the main maximum is arranged asymmetrically, it is preferred that the sub-maximum be at a small angle to the LED main emission direction or be approximately symmetrical to the LED main emission direction. This arrangement has the advantage that when turning the LED lighting device to the main emission of the LED, the main maximum individual can be steered in one direction, while the secondary maximum remains in approximately the same solid angle range regardless of the orientation of the main maximum.

Preferably, the light-guiding body has a plurality of light exit surfaces, wherein according to a preferred embodiment one or more light exit surfaces are assigned to either the main maximum or a secondary maximum.

Preferably, two light exit surfaces are provided for the main maximum. For example, a light exit surface may output a narrowly focused bundle of light rays, while the second light exit surface may output a divergent bundle of light rays. As a result, a desired location can be spot-illuminated with the main maximum, and the adjacent surroundings can be lightened with the divergent bundle of light beams.

According to one embodiment, the light-guiding body has one or more surfaces which are arranged opposite the LED so that a part of the light of the LED is totally reflected thereon. As a result, the light can be guided in the manner of a channel to the desired light exit surface in the light-guiding body. The interfaces where the light is totally reflected can be either flat or curved. Due to the curvature, the corresponding light bundle, which is totally reflected at this interface, either expanded or bundled. Alternatively, the surfaces of the light-guiding body, on which light radiation is reflected, may also be mirrored. The mirrored surfaces may also be concave or convex in order to widen or focus the light beam.

According to a preferred embodiment, the light-guiding body has one or more light entry surfaces through which the light from the LED is coupled into the light-guiding body. Alternatively, the LED can also be integrated in the light-guiding body. The plurality of light entry surfaces have the advantage that the incident light in the Lichtlenkköper can be divided into several bundles, which are forwarded in the light guide body in different directions. In particular, the light entry surfaces may also be curved in order to receive the corresponding beam when the light enters the light guide body focus or widen. In the case of a convexly curved light entry surface, the light bundle focuses on the light beam at the light entry surface, while the corresponding bundle is widened in the case of a concave light entry surface.

According to one embodiment, one or more light entry surfaces are arranged rotationally symmetrical about the LED main emission direction. In this embodiment, by turning the light guide body relative to the LED, the direction of the main and secondary maximum can be adjusted around the main emission direction of the LED, without the LED having to be moved with the light guide body. This embodiment is advantageous for applications in which the LED is fixedly arranged, for example, on an electrical circuit board and the light-guiding body can be arranged in various positions on the circuit board. Alternatively, the light entry surface may at least partially extend parallel to the light exit surface.

According to a preferred embodiment, the light of the LED when coupled into the light-guiding body is divided by a plurality of light entry surfaces into at least two, preferably three, light bundles. These light beams can then be directed independently of each other either towards the main maximum or to one of the secondary maxima. In addition, the light bundles can be bundled or expanded independently of each other in the light guide body either directly on entry through one of the light entry surfaces, the light through a concave or convex curved light exit surface or total internal reflection within the light guide body at a concave or convex interfaces.

In particular, a plurality of light-guiding bundles can also be directed in the direction of the main maximum and / or one or more light bundles can be directed to the secondary maximum.

According to one embodiment, at least one light exit surface extends in a straight line in a direction perpendicular to the said sectional plane. In this embodiment, the light distribution of the light bundles emerging through the light exit surface is mirror-symmetrical formed with respect to a plane which is perpendicular to the rectilinear longitudinal extent of the light exit surface and the axis of the main emission of the LED contains.

According to one embodiment, a plurality of non-parallel sides may also be provided on the light-guiding body, on each of which at least one light-emitting surface is arranged. In a rectangular or an approximately square basic shape of the light guide body can be in four directions with an azimuthal angle of 0 °, 90 °, 180 ° or 270 ° relative to the main LED emission direction Maximas in the light distribution curve, i. either main or secondary maxima. The asymmetry of the main maximum with respect to the main LED emission direction is nevertheless retained. Preferably, the LED lighting devices described above are used in street lights. The main maximum in the light distribution curve is used to illuminate the roadway, while the sub-maximum improves the uniformity of the light distribution on the evaluation area. By a variable positioning (in particular rotation) of the light-guiding body or the entire LED illumination device around the main emission direction of the LED, a desired emission direction can be set.

According to a further aspect, the invention relates to a street lamp with a board, on which a plurality of LED lighting devices are installed, wherein each of the LED lighting devices comprises at least one LED with respect to a main direction of the LED rotationally symmetrical light output and a light guide body, which consists of a light guide is formed and has at least one light exit surface, wherein light of the LED is coupled in the light guide body and the light guide body deflects at least a portion of the light so that it leaves the light guide body through a light exit surface with a light distribution which is asymmetrical with respect to the main emission of the LED, and the light distribution in a sectional plane in which the main emission direction of the LED lies and intersects the light entry surface defines a light distribution having a main maximum that is asymmetrical with respect to the main emission direction of the L. ED is.

Preferably, the luminaire comprises a plurality of identical LED lighting devices according to embodiments as described above.

The use of LED lighting devices with asymmetrical main maximum allows to set up the light for the desired lighting task in an advantageous manner. In particular, for street lights, which are to illuminate an elongated portion of a road, the following preferred embodiments are provided.

According to one embodiment, the luminaire comprises a plurality of groups of LED lighting devices whose main maxima each have the same spatial orientation with respect to their LED main emission direction.

Preferably, the orientation of two groups is arranged mirror-symmetrically with respect to a plane that intersects the board vertically. In the case of a street lamp directed onto the roadway, this corresponds to the vertical plane of the luminaire transversely to the roadway longitudinal extent.

According to a preferred embodiment, a first and a second group of LED lighting devices of the luminaire is provided, whose main maxima each have an azimuthal angle with respect to the LED main emission direction, which are aligned opposite to one another. This embodiment of a luminaire generates a light distribution on the illuminated surface, such as the roadway, which extends symmetrically to both sides of the lamp. According to a further preferred embodiment, a third and a fourth group of LED lighting devices is provided in the luminaire whose main maxima form an angle between 5 ° and 30 ° or between -5 ° and -30 ° with respect to the first and second group. By the third and fourth group of LED lighting devices, a Lichtbandknickung is generated, which is particularly advantageous for street lights, which are not centrally located above the road, but at the edge of the road. Due to the Lichtbandknickung despite the arrangement on the edge of the road, the width of the belt is largely uniformly illuminated.

According to a further embodiment, further groups of LED lighting devices are provided which are symmetrical with respect to the plane perpendicular to the board, i. the vertical plane of the lamp, are arranged. In particular, the LED lighting devices can also be provided variably positionable in the lamp.

Figur 1

zeigt eine Schnittdarstellung durch eine LED-Beleuchtungseinrichtung der vorliegenden Erfindung.

Figur 2

zeigt eine Aufsicht auf die LED-Beleuchtungseinrichtung der vorliegenden Erfindung.

Figur 3

zeigt eine Schnittdarstellung durch die LED-Beleuchtungseinrichtung nach Figur 1 mit der Schnittebene in der Mittelebenen und mit eingezeichnetem Lichtstrahlengang.

Figur 4

zeigt schematisch die Lichtverteilungskurve der LED-Beleuchtungseinrichtung in einer Schnittebene entsprechend der Figuren 1 und 3.

Figur 5

zeigt eine perspektivische Ansicht eines Lichtlenkkörpers der LED-Beleuchtungseinrichtung.

Figur 6

zeigt eine Aufsicht auf die Lichtaustrittsfläche einer Leuchte mit mehreren LED-Beleuchtungseinrichtungen gemäß der vorliegenden Erfindung.

Figur 7

zeigt schematisch die Lichtverteilungskurve der Leuchte nach Figur 6 in einer Polardarstellung.

Figur 8

zeigt eine Aufsicht auf die Leuchte gemäß Figur 6 mit eingezeichnetem Lichtstrahlengang entlang der Richtung der Hauptmaxima.

Figur 9

zeigt die Lichtverteilungskurve einer Leuchte entsprechend der Figur 7 in einer Kegelmantelkurve auf einer zu beleuchtenden Straße.

Figur 10

zeigt die Lichtverteilungskurve in einer Kegelmantelkurve auf einer zu beleuchtenden Straße einer alternativen Ausführungsform einer Leuchte.

Other features and advantages of the present invention will become apparent from the following description of a preferred embodiment. The figures show the following:

FIG. 1

shows a sectional view through an LED lighting device of the present invention.

FIG. 2

shows a plan view of the LED lighting device of the present invention.

FIG. 3

shows a sectional view of the LED lighting device after FIG. 1 with the cutting plane in the middle planes and with marked light beam path.

FIG. 4

schematically shows the light distribution curve of the LED lighting device in a sectional plane corresponding to FIGS. 1 and 3 ,

FIG. 5

shows a perspective view of a light-guiding body of the LED lighting device.

FIG. 6

shows a plan view of the light-emitting surface of a lamp with multiple LED lighting devices according to the present invention.

FIG. 7

schematically shows the light distribution curve of the luminaire FIG. 6 in a polar representation.

FIG. 8

shows a plan view of the lamp according to FIG. 6 with drawn light beam path along the direction of the main maxima.

FIG. 9

shows the light distribution curve of a lamp according to the FIG. 7 in a cone-shaped curve on a street to be illuminated.

FIG. 10

shows the light distribution curve in a cone-shaped curve on a street to be illuminated of an alternative embodiment of a luminaire.

The LED lighting device has an LED 1, which is arranged in a recess 2 of a light-guiding body 3. The light-guiding body is in the illustrated embodiment a full-thickness conductor, which is formed throughout from a transparent plastic (PMMA).

As in the supervision according to FIG. 2 can be seen, the light-guiding body 3 has a longitudinal extent (in the image plane of FIG. 2 the horizontal), wherein the recess 2 extends laterally of the LED 1 substantially in the longitudinal direction of the light-guiding body 3. As in the perspective view FIG. 5 , which shows the light guide body 3 without LED, can be clearly seen, the recess 2 is cut out on one longitudinal side and formed partially circular on the opposite longitudinal side.

The recess 2 in the light guide body 3 forms a total of three light entry surfaces 5, 6 and 7, which surround the LED 1. The light entrance surface 5 opposite the LED in its main emission direction is curved convexly, while the side of the LED 1 arranged light entry surfaces 6 and 7 are in a sectional plane in which the main emission of the LED is straight. The section plane corresponds to the image plane of FIGS. 1 and 3 , The LED main emission direction corresponds to the vertical in the FIGS. 1 and 3 ,

Like in the FIG. 3 is shown, the light emanating from the LED 1 passes through the light entry surfaces 5, 6 and 7 in the light guide body 3 and is thereby divided into three beams 8, 9 and 10. The bundle of rays 9, which enters the light-guiding body 3 along the main emission direction of the LED 1 through the light entry surface 5, is slightly focused due to a convex curvature of the light entry surface 5 when light enters through light refraction.

In the further course of the beam 9 impinges on an interface 11 of the light-guiding body 3, which is arranged so that the beam 9 is totally reflected. The interface 11 is also curved slightly convex, whereby the beam 9 is further focused. After total reflection at the interface 11, the beam 9 leaves the light-guiding body through a light exit surface 12. The light exit surface 12 is flat. The bundle of rays 9, which leaves the light-guiding body somewhat focused, forms a main maximum 13 in the light-intensity distribution. The main maximum 13 is in an angular range between 45 ° and 70 ° relative to the main emission direction of the LED. The polar representation of the light intensity distribution is in FIG. 4 shown. The 0 ° vertical in the FIG. 4 schematically corresponds to the main emission of the LED. 1

Another light beam 8 enters from the LED 1 through the light entrance surface 6 in the light guide body and leaves without further reflection the light guide body 3 by a flat light exit surface 14 which is arranged at a distance from the light exit surface 12 on the same side of the light guide body. After the refraction at the light entry surface 6 and the light exit surface 14, the beam 8 has a direction which likewise corresponds to the angle range of the main maximum 13. In contrast to the beam 9, however, the beam 8 is widened more. In the light intensity distribution, the beam 8 ensures a widening of the main maximum 13. The light beam 8 is formed approximately by the proportion of the light of the LED 1, which leaves the LED in the direction of the main maximum anyway. Due to the refraction at the light entry surface 6 and the light exit surface 14, the light beam 8 is deflected only slightly.

The third light bundle 10 enters the light-guiding body from the LED 1 through the light entry surface 7 and is totally reflected at a flat boundary surface 15. The interface 15 is arranged opposite to the LED so that the light after total reflection leaves the interface 15 approximately parallel. Thereafter, the beam 10 is passed through the light guide body 3, which forms a kind of channel for the light beam 10 in this area. The channel is formed by approximately parallel interfaces 16 and 17 of the light-guiding body 3, which extend laterally offset from the main emission direction of the LED 1. Upon impact of light rays on these interfaces, for example, the interface 16 as in FIG. 3 shown, the radiation is reflected. Finally, the light beam 10 exits through the light exit surface 18 from the channel 16, 17 of the light-guiding body 3 and leaves it in the direction of approximately + 15 ° relative to the main emission direction of the LED. By the beam 10 is in the light distribution curve, in FIG. 4 is shown, the secondary maximum 19 formed.

The secondary maximum 19 is deflected less than the main maximum 13 with respect to the main emission direction of the LED. This configuration is particularly favorable for various lighting tasks, for example for the formation of street lighting. The main maximum 13 can be aligned in the direction of the roadway, while the secondary maximum 19 brightens an area laterally of the roadway approximately below the streetlight. Due to the asymmetry of the main maximum 13, it is possible by a variable positioning of the LED lighting fixture, i. by a rotation of the LED lighting body about the vertical axis, according to the invention possible to align the lighting fixture for desired lighting tasks. It is advantageous that the secondary maximum 19 is in an angular range of ± 20 ° to the vertical of the illumination device, because it ensures illumination of the area below the lamp, regardless of the azimuthal orientation of the main maximum thirteenth

In order to install the LED lighting device in a lamp, pins 20 are provided on an upper side, with the aid of which the lighting device is mechanically fastened in a lamp, for example on a circuit board. In particular, the light-guiding body can be glued or soldered. In the latter case, the light guide body is partly with Metal provided and formed of a heat-resistant material (greater than 185 ° C). In particular, a variable positioning of the light-guiding body is possible. For this purpose, a partially circular centering aid 4 is provided in the recess 2, which cooperates positively with the LED or another opposing component. The LED 1 can either be firmly connected to the light-guiding body 3 or fixed on the opposite component of the luminaire.

The embodiment of the lighting fixture shown in the figures, in the plan view, as shown in the FIG. 2 is shown, an approximately rectangular basic shape, wherein the light exit surfaces 12 and 14 form parts of a serrated profile on one side.

According to other embodiments, light exit surfaces may be provided on opposite sides of the lighting fixture. Furthermore, according to an alternative embodiment, light exit surfaces may also be provided on non-opposite sides of the light exit body. For example, the light exit body may have an approximately square basic shape and light exit surfaces are formed on all four side surfaces. These embodiments produce a plurality of main asymmetrical maxima which are aligned in a different azimuthal angle range with respect to the main emission direction of the LED.

Further embodiments of the LED illumination device are possible within the scope of the invention. For example, the light-guiding body can also be designed in the form of a hollow light guide, the boundary surfaces described above being formed by walls of the light waveguide which are mirrored inwards.

According to a further embodiment, the LED lighting fixture comprises a plurality of LEDs. These are, for example, in a row parallel to the longitudinal extension of the light exit window, ie perpendicular to the image plane of FIGS. 1 and 3 arranged. In this embodiment, the boundary surfaces and the light exit surfaces of the light guide body extend in a straight line parallel to the arranged in a row LEDs. In particular, LEDs can be different Combined color in an LED lighting fixture, for example, to produce white light.

According to another aspect of the invention, a plurality of the lighting fixtures described above are in a luminaire as shown in FIG FIG. 6 is shown combined. The FIG. 6 shows a plan view of an outdoor lamp 21, which is a street lamp in the illustrated embodiment.

The FIG. 6 shows a plan view of the light exit side of the street lamp 21, wherein a mast 22 to which the lamp 21 attached, is shown in cross section. On a common board 23, a plurality of LED lighting devices are mounted, each comprising an LED 1 and a light-guiding body 3, as described above. The board is flat in the illustrated embodiment. However, according to alternative embodiments, the board may also be curved along an axis, in particular along the longitudinal axis of the luminaire.

The plurality of LED illuminators partially have a different spatial arrangement relative to rotation about their respective LED main emission direction. The LED lighting devices are arranged symmetrically with respect to a vertical plane through the lamp. The LED lighting devices are aligned so that their respective main maxima are each aligned substantially perpendicular to both sides of the vertical plane. This results in a total symmetrical light distribution curve of the luminaire, which in the polar diagram in FIG. 7 is shown. The main maxima 13 of all lighting devices are superimposed to two combined main maxima 13 ', which extend symmetrically on both sides of the lamp. The secondary maxima 19 are superimposed to a combined secondary maximum 19 ', which is mirror-symmetrical with respect to the vertical plane through the lamp.

According to the in FIG. 6 illustrated embodiment of the street lamp 21 are only a part, but preferably the majority of all LED lighting devices oriented so that their main maxima extend opposite to the vertical plane of the luminaire. This only applies to the groups 31a and 31b of LED lighting devices. These are each aligned with 0 ° relative to an axis transverse to the longitudinal axis of the lamp. Two further groups 32a and 32b of LED lighting devices are inclined at an angle of + 10 ° and -10 ° with respect to the transverse axis of the lamp. Two further groups 33a and 33b are inclined at an angle of + 20 ° and -20 ° with respect to the transverse axis of the lamp. In the FIG. 8 the rays of the respective main maximum of the different LED groups are shown. As can be seen in the plan, three beams extend on both sides of the luminaires, occupying an angle of 0 °, ± 10 ° and ± 20 ° respectively with respect to the transverse axis of the lamp. This results in a light curve distribution on a surface to be illuminated, which is a conical envelope curve (ie a polar representation of the light intensity along the section of a cone shroud with a predetermined opening angle around the vertical of the luminaire) in the FIG. 9 is shown. The peculiarity of the light distribution curve is the Lichtbandknickung, which is achieved by the groups 32 a, b and 33 a, b of the LED lighting fixture. The luminous intensity, which is directed at the surface to be illuminated, is symmetrical on both sides of the luminaire, but displaced forwards at an angle of approximately ± 15 ° with respect to the transverse axis of the luminaire. By this Lichtbandknickung can be, for example, a street evenly illuminate over its width, even if the street lamp 21 is mounted on one longitudinal side of the road. By a multiplicity of luminaires 21, which in each case a Lichtbandknickung, like in the FIG. 9 shown, the road can be illuminated almost uniformly over its length and width.

The FIG. 10 FIG. 2 shows the light distribution curve in a cone-crest representation according to FIG FIG. 9 However, for an alternative embodiment of the luminaire, in which the LED lighting devices are divided into only two groups, each occupying an angle of 0 ° to the transverse light extension (this corresponds to the group 31, as shown in FIG FIG. 6 is shown). Such a luminaire is preferred if only one street side is to be illuminated, as in FIG. 10 shown. Alternatively, such street lights can also be mounted centrally above the road to illuminate both road halves of the road.

The invention also provides, in particular, that the LED lighting devices can be variably positioned on the board. This makes it possible in particular different Lichtbandknickungen, as in connection with the FIGS. 9 and 10 described, realized by a luminaire type.

LIST OF REFERENCE NUMBERS

1

LED

2

deepening

3

Light-guiding body

4

centering

5

Light entry surface

6

Light entry surface

7

Light entry surface

8th

ray beam

9

ray beam

10

ray beam

11

interface

12

Light-emitting surface

13

main maximum

13 '

combined main maximum

14

Light-emitting surface

15

interface

16

interface

17

interface

18

Light-emitting surface

19

secondary maximum

19 '

combined secondary maximum

20

spigot

21

street lamp

22

mast

23

circuit board

31a, b

Group of LED lighting devices

32a, b

Group of LED lighting devices

33a, b

Group of LED lighting devices

Claims (15)

1. Street light with a plurality of LED lighting devices, which in each case comprise at least one LED (1) with a main radiation direction in the light emission of the LED and a light conducting body (3) which is formed from a light conductor and at least one light distribution surface (12, 14, 18),
   wherein light from the LED (1) is coupled into the light conducting body (3) and the light conducting body (3) deflects at least a part of the light in such a way that it leaves the light conducting body (3) through the light distribution surface (12, 14, 18) with a light distribution which is asymmetric in relation to the main radiation direction of the LED,
   wherein the light distribution in a cutting plane, in which the main radiation direction of the LED lies and which intersects the light distribution surface (12, 14, 18), defines a light distribution curve which has a main maximum (13) and at least one secondary maximum, whereby the main maximum (13) lies asymmetrically in relation to the main beam direction of the LED.
2. Street light according to claim 1, wherein the main maximum (13) lies in the cutting plane opposite the LED main radiation direction in an angle range of between 45° to 80°, preferably between 55° and 75°, and/or the secondary maximum (19) lies in the cutting plane opposite the LED main radiation direction in an angle range of between -30° and 30°, preferably between -20° and 20°.
3. Street light according to any one of the preceding claims, wherein the portion of the light which leaves the light conducting body (3) in the direction of the main maximum (13), and the portion of the light which leaves the light conducting body in the direction of the secondary maximum (19) pass through different light distribution surfaces (12, 14, 18) of the light conducting body (3).
4. Street light according to any one of the preceding claims, wherein the portion of the light which leaves the light conducting body (3) in the direction of the main maximum leaves the light conducting body through at least two different light distribution surfaces (12, 14) of the light conducting body (3).
5. Street light according to any one of the preceding claims, wherein the light conducting body comprises one or more surfaces (11, 15, 16) which are arranged in relation to the LED in such a way that light from the LED is totally reflected from it.
6. Street light according to any one of the preceding claims, wherein the light from the LED is coupled in through one or more light inlet surfaces (5, 6, 7) into the light conducting body (3).
7. Street light according to claim 6, wherein the one or more light inlet surfaces is/are arranged rotation-symmetrically about the LED main radiation direction or at least in sections parallel to at least one light distribution surfaces (12, 14, 18).
8. Street light according to claim 6 or 7, wherein the light from the LED, on being coupled in through a plurality of light inlet surfaces (5; 6; 7), is divided into at least two, and preferably three, light bundles, wherein, in particular, one or more of the light bundles (8, 9) is/are deflected through the light conducting body in the direction of the main maximum (13) and one or more of the other light bundles (16) are deflected in the direction of the secondary maximum (19).
9. Street light according to any one of the preceding claims, wherein the at least one light distribution surfaces (12, 14, 18) extends in a straight line in the direction perpendicular to the said cutting plane.
10. Street light according to any one of the preceding claims, wherein a plurality of LED's are provided, which are arranged in particular in a row, in particular perpendicular to the said cutting plane.
11. Street light according to any one of the preceding claims, wherein the light conducting body comprises non-parallel sides, at which light distribution surfaces are arranged.
12. Street light with a PCB (23) on which a plurality of LED lighting devices are installed, wherein each of the LED lighting devices comprises at least one LED (1) with a light emission rotationally symmetrical in relation to a main radiation direction of the LED, and in each case a light conducting body (3), which is formed from a light conductor and comprises at least one light distribution surface (12, 14, 18), wherein light from the LED (1) is coupled into the light conducting body (3), and the light conducting body (3) deflects at least a part of the light in such a way that it leaves the light conducting body (3) through a light distribution surface (12, 14, 18) with a light distribution which is asymmetric in relation to the main radiation direction of the LED, wherein the light distribution defines in a cutting plane, in which the main radiation direction of the LED lies and which intersects the light distribution surface (12, 14, 18), a light distribution curve, which exhibits a main maximum (13) which lies asymmetrically in relation to the main radiation direction of the LED.
13. Street light according to claim 12, wherein the plurality of LED lighting devices comprise two or more groups (31a, 31b, 32a, 32b, 33a, 33b) of LED lighting devices, of which the main maxima in each case have the same spatial orientation in relation to their respective LED main radiation direction, wherein, in particular, the spatial orientation of two of the groups (31a, 31b; 32a, 32b; 33a, 33b) of LED lighting devices is mirror-symmetric in relation to a plane which the PCB (23) of the light intersects perpendicularly.
14. Street light according to claim 13, comprising a first and a second group (31a, 31b) of LED lighting devices, of which the main maxima in each case comprise an azimuth angle in relation to their respective LED main radiation direction, such that the main maxima of the two groups are oriented opposed to one another in relation to the azimuth angle alignment.
15. Street light according to claim 14, which further comprises a third and a fourth group (32a, 32b) of LED lighting devices, wherein the main maxima of the third group (32a) adopt a unitary azimuth angle in relation to the LED main radiation direction of between 5° and 30° in relation to the main maxima of the first group, and the fourth group (32b) adopt a unitary azimuth angle in relation to the LED main radiation direction of between -5° and -30° in relation to the second group.

Images