Outdoor lighting fixture and lamppost equipped with such a device

Abstract

The present invention relates to a lighting device (4) comprising at least three LEDs (7, 8, 9), each LED (7, 8, 9) being selected solely from the group comprising: - a first LED (7) emitting green light with a nominal wavelength between 513 nanometers and 543 nanometers, - a second LED (8) emitting amber light with a nominal wavelength between 583 nanometers and 605 nanometers, and - a third LED (9) emitting red-orange light with a nominal wavelength between 610 nanometers and 635 nanometers, the lighting device (4) comprising M first LEDs (7), N second LEDs (8) and P third LEDs (9), with N ≥ 1, M ≥ 1 and P ≥ 1. The invention also relates to an outdoor lamppost comprising at least one such lighting device (4). Figure for the abridged version: Fig. 3

Description

Title of the invention: Lighting device and outdoor lamp post equipped with such a device FIELD OF THE INVENTION

[0001] The present invention relates to the field of lighting, and in particular to a lighting device and to an outdoor lamppost equipped with such a device. STATE OF THE ART

[0002] Lighting devices are known which emit light in the spectrum visible to a human observer. Such lighting devices comprise, for example, a plurality of LEDs, also called light-emitting diodes, which make it possible to generate high-intensity lighting over a broad spectrum visible to the human eye while limiting the electrical consumption of these lighting devices.

[0003] However, these lighting devices affect the biological rhythm of plants and animals. Thus, these lighting devices affect the growth of plants, by causing artificial photosynthesis, not resulting from sunlight. Furthermore, these lighting devices harm animals, such as insects, birds, fish and mammals. Indeed, these lighting devices disrupt their growth, orientation, phototaxis or chronobiological cycle, such as their circadian rhythm. Indeed, the generation of light by these lighting devices, particularly during the night, forces photosynthesis in plants and disrupts animals. Statement of the invention

[0004] The invention aims in particular to provide a lighting device which provides comfortable lighting for humans while avoiding encouraging photosynthesis in plants and limiting disturbances to animals.

[0005] According to a first aspect, the invention proposes a lighting device comprising at least three LEDs, each LED being chosen solely from the group comprising: - a first LED emitting green light with a nominal wavelength between 513 nanometers and 543 nanometers, - a second LED emitting amber light with a nominal wavelength between 583 nanometers and 605 nanometers, and - a third LED emitting red-orange light with a nominal wavelength between 610 nanometers and 635 nanometers, the lighting device comprising M first LEDs, N second LEDs and P third LEDs, with N>l,M>l andP>l.

[0006] Thus, the lighting device provides comfortable lighting for humans while avoiding encouraging photosynthesis in plants and limiting disturbances to animals. More specifically, the use of three types of LEDs of different colors makes it possible to obtain light from three colors, which is comfortable for humans, because humans are trichromats. In addition, the overall color of the light emitted by the lighting device is golden for a human observer, and is thus close to the color of the light emitted by a high-pressure sodium lamp, widely used in urban lighting. The substitution of such a high-pressure sodium lamp by a lighting device according to the invention does not change the visual habits of the human observer accustomed to nocturnal urban outdoor lighting by high-pressure sodium lamps.Furthermore, the light emission spectrum of the lighting device avoids encouraging photosynthesis in plants, in particular because it is located almost outside the absorption spectrum of chlorophyll a and mainly outside the absorption spectrum of chlorophyll b. Finally, the light emission spectrum of the lighting device limits disturbances to animals, particularly insects.

[0007] According to a second aspect, the invention also proposes an outdoor lamppost, comprising a mast carrying a head, the head comprising at least one lighting device as previously described.

[0008] Indeed, the overall color of the light emitted by the lighting device is golden, and is thus close to the color of the light emitted by a high-pressure sodium lamp, widely used in urban lighting. The substitution of such a high-pressure sodium lamp by a lighting device according to the invention does not modify the visual habits of a human observer accustomed to nighttime urban exterior lighting by high-pressure sodium lamps. Thus, an outdoor lamppost equipped with the lighting device provides comfortable lighting for humans.

[0009] The invention is advantageously and optionally supplemented by the following characteristics, taken alone or in any of their technically possible combinations:

[0010] - The lighting device is such that: - a first set of the first n LEDs has a relative light intensity between 0.39 and 0.43, - a second set of the second m LEDs has a relative light intensity of between 0.62 and 0.68, and - a third set of the p third LEDs has a relative luminous intensity equal to 1.0. Thus, the overall color of the light emitted by the lighting device is golden for a human observer, and is therefore comfortable for man.

[0011] - The lighting device is such that: - the first set of the first n LEDs has a relative luminous intensity equal to 0.41, - the second set of m second LEDs has a relative luminous intensity equal to 0.65. Thus, the overall color of the light emitted by the lighting device is particularly golden for a human observer, and is therefore particularly comfortable for humans.

[0012] - Each of the N second LEDs emits an amber light with a wavelength nominal between 583 nanometers and 595 nanometers.

[0013] - Each of the third P LEDs emits a red-orange light with a length nominal wavelength between 620 nanometers and 635 nanometers, preferably between 620 nanometers and 632 nanometers.

[0014] - Each LED has a bandwidth between 10 nanometers and 70 nm meters. Thus, the limited bandwidth of each LED avoids encouraging photosynthesis in plants and limits disturbance to animals.

[0015] - Each LED has a bandwidth between 10 nanometers and 40 nm nometers, preferably between 16 and 30 nanometers. Thus, the particularly limited bandwidth of each LED particularly avoids encouraging photosynthesis in plants and particularly limits disturbances to animals.

[0016] - The lighting device is such that P < M < N. Indeed, the LEDs emitting a High-power amber LEDs are expensive compared to green-emitting LEDs and red-orange LEDs. Therefore, it is advantageous to use a larger number of lower-power amber LEDs to limit the cost of the lighting system.

[0017] - The lighting device is such that N = 2x M and / or N = 2 x P. Thus, the distribution LEDs are facilitated for the emission of homogeneous light by the lighting device.

[0018] - The lighting device is such that M = PetN = 2xM. Thus, the distribution of the LED is particularly facilitated for the emission of homogeneous light by the lighting device.

[0019] - The lighting device is such that M = P = 7 and N = 14. Thus, such a device lighting system offers a good compromise between manufacturing and assembly costs and homogeneity of the light emitted by the lighting device.

[0020] - The lighting device is such that the LEDs are coplanar. Thus, the arrangement LEDs are facilitated for the emission of homogeneous light by the lighting device.

[0021] - The lighting device is such that the LEDs are oriented parallel to each other to others. This makes it easier to arrange the LEDs so that the lighting device emits uniform light.

[0022] - The lighting device is such that the LEDs emit in directions main parallel to each other. This makes it easier to arrange the LEDs so that the lighting device emits a homogeneous light.

[0023] - The lighting device comprises a support, the LEDs being arranged on the support. This simplifies the design and handling of the lighting device.

[0024] - The lighting device is such that the LEDs are regularly distributed on the support, preferably the LEDs being distributed symmetrically relative to the center of the support.

[0025] - For each second LED, at least one first LED and at least one third LEDs are the LEDs closest to the second LED. Thus, the light emitted by the lighting device has a color distribution whose homogeneity is improved.

[0026] - The lighting device is configured to emit light at a temperature of color between 2230 and 2330 Kelvin, preferably equal to 2280 Kelvin. Thus, the overall color of the light emitted by the lighting device is particularly golden for a human observer, and is therefore particularly comfortable for humans.

[0027] - The outdoor lamp post is configured to provide outdoor lighting, night preference.

[0028] - The outdoor lamp post is configured to provide outdoor lighting in urban environment.

[0029] - The outdoor lamp post comprises three aligned lighting devices, of preferably attached. Thus, the luminous flux emitted by each lighting device can be limited and the production of the lighting device is modular, which reduces the overall cost of the outdoor lamppost.

[0030] - The outdoor lamp post is configured to emit a luminous flux comprised between 7500 and 8000 lumens, preferably equal to 7800 lumens. Thus, the luminous flux is significant, and is sufficient for example for night-time urban outdoor lighting.

[0031] - The mast has a height between 4 and 8 meters, preferably equal to 8 meters. Therefore, the lighting area provided by the outdoor lamp post is important.

[0032] - The head has a housing. Thus, the housing makes it possible to protect the device lighting from bad weather or damage.

[0033] - The support is housed in the housing.

[0034] - The housing is made of aluminum.

[0035] - The housing houses a power supply unit. DESCRIPTION OF FIGURES

[0036] [Fig.l] is a schematic side view of one embodiment of an outdoor lamp post;

[0037] [Fig.2] is a schematic perspective view of one embodiment of a head of the outdoor lamppost shown in [Fig.l];

[0038] [Fig.3] is a schematic bottom view of an embodiment of a device head lighting shown in [Fig.2];

[0039] [Fig.4] shows a graph representing the light emission spectrum of a lighting device according to the invention, in particular the lighting device shown in [Fig. 3], the graph having the wavelength in nanometers as its abscissa and the relative light intensity as its ordinate.

[0040] Throughout the figures, similar elements are designated by identical references. DETAILED DESCRIPTION OF THE INVENTION

[0041] [Fig.l] shows an embodiment of an outdoor lamp post 1. The outdoor lamp post 1 comprises a mast 2 and a head 3. The mast 2 carries the head 3. The head 3 comprises at least one lighting device 4.

[0042] Advantageously, the outdoor lamp post 1 is configured to emit a luminous flux of between 7500 and 8000 lumens, preferably equal to 7800 lumens.

[0043] Advantageously, the outdoor lamppost 1 is configured to provide outdoor lighting, preferably at night.

[0044] Preferably, the outdoor lamppost 1 is configured to provide outdoor lighting in an urban environment.

[0045] Thus, night-time use of the outdoor lamppost 1 in an urban environment is possible.

[0046] Advantageously, the mast 2 has a height between 4 and 8 meters, preferably equal to 8 meters.

[0047] Advantageously, the head 3 comprises a housing 5. Preferably, the housing 5 is made of aluminum.

[0048] Advantageously, the housing 5 houses an electrical power supply unit 6. The electrical power supply unit 6 supplies the lighting device 4.

[0049] Advantageously, the housing 5 comprises a tube 5a. Preferably, the tube 5a is engaged in the mast 2, in order to allow the head 3 to be held in position on the mast 2. The tube 5a is hollow in order to allow the passage of electrical power supply cables extending through the mast 2 into the housing 5.

[0050] Advantageously, the electrical power supply cables supply the lighting device 4 via the electrical power supply unit 6.

[0051] [Fig.2] represents an embodiment of the head 3. In this example, the head 3 has three lighting devices 4.

[0052] Advantageously, the three lighting devices 4 are aligned. Preferably, the three lighting devices 4 are adjacent to each other.

[0053] [Fig. 3] represents an embodiment of the lighting device 4.

[0054] The lighting device 4 comprises at least three LEDs 7, 8, 9. Each LED 7, 8, 9 is chosen only from the group comprising: - a first LED 7 emitting green light with a nominal wavelength between 513 nanometers and 543 nanometers, - a second LED 8 emitting an amber light with a nominal wavelength between 583 nanometers and 605 nanometers, and - a third LED 9 emitting a red-orange light with a nominal wavelength between 610 nanometers and 635 nanometers.

[0055] For example, each of the first M LEDs 7 is an OSRAM OSLON® SSL 80, GT CS8PM1.13 LED, preferably conforming to its technical data sheet version 1.16.

[0056] Advantageously, each of the N second LEDs 8 emits an amber light with a nominal wavelength between 583 nanometers and 595 nanometers.

[0057] For example, each of the N second LEDs 8 is an OSRAM OSLON® SSL 80, GY CS8PM1.23 LED, preferably conforming to its technical data sheet version 1.6.

[0058] Advantageously, each of the P third LEDs 9 emits a red-orange light with a nominal wavelength of between 620 nanometers and 635 nanometers, preferably between 620 nanometers and 632 nanometers.

[0059] For example, each of the P third LEDs 9 is an OSRAM OSLON® SSL 80, GR CS8PM1.23 LED, preferably conforming to its technical data sheet version 1.8.

[0060] Advantageously, the lighting device 4 is such that: - all of the first N LEDs 7 have a relative light intensity between 0.39 and 0.43, - the set of M second LEDs 8 has a relative luminous intensity of between 0.62 and 0.68, and - the set of P third LEDs 9 has a relative luminous intensity equal to 1.0.

[0061] Preferably, the lighting device 4 is such that: - the set of the first N LEDs has a relative luminous intensity equal to 0.41, - the set of M second LEDs has a relative luminous intensity equal to 0.65.

[0062] Advantageously, the lighting device 4 is configured to emit light at a color temperature of between 2230 and 2330 Kelvin, preferably equal at 2280 Kelvin.

[0063] Advantageously, each LED 7, 8, 9 has a bandwidth of between 10 nanometers and 70 nanometers. Preferably, each LED 7, 8, 9 has a bandwidth of between 10 nanometers and 40 nanometers, more preferably between 16 nanometers and 30 nanometers.

[0064] Advantageously, the lighting device 4 comprises M first LEDs 7, N second LEDs 8 and P third LEDs 9, with N>1, M>1 and P>1.

[0065] Preferably, the lighting device 4 is such that P < M < N.

[0066] Preferably, the lighting device 4 is such that N = 2 x M and / or N = 2 x P. More preferably, the lighting device 4 is such that M = PetN = 2xM. Even more preferably, the lighting device 4 is such that M = P = 7etN = 14. Thus, for example, the lighting device 4 comprises 7 first LEDs 7, 14 second LEDs 8 and 7 third LEDs 9.

[0067] Advantageously, the lighting device 4 comprises a support 10. Preferably, the LEDs 7, 8, 9 are arranged on the support 10.

[0068] Preferably, the support 10 is housed in the housing 5.

[0069] Advantageously, the lighting device 4 is such that the LEDs 7, 8, 9 are coplanar.

[0070] Advantageously, the lighting device 4 is such that the LEDs 7, 8, 9 are oriented parallel to each other.

[0071] Advantageously, the lighting device 4 is such that the LEDs 7, 8, 9 emit in main directions parallel to each other.

[0072] Advantageously, the lighting device 4 is such that the LEDs 7, 8, 9 are regularly distributed on the support 10. Preferably, the LEDs 7, 8, 9 are distributed symmetrically relative to the center of the support, in particular without taking into consideration the type of LED, namely first LED 7, second LED 8 or third LED 9.

[0073] Preferably, for each second LED 8, at least one first LED 7 and at least one third LED 9 are the LEDs closest to the second LED 8.

[0074] [Fig. 4] shows a graph representing the light emission spectrum of the lighting device 4. The light emission spectrum of the lighting device 4 is thus not significant, for example of relative light intensity greater than 0.2, or even greater than 0.1, neither in the ultraviolets with a wavelength less than 380 nm, nor in the violets with a wavelength between 380 nanometers and 450 nanometers, nor in the blues with a wavelength of 450 nanometers to 500 nanometers, nor in the reds with a wavelength of 650 nanometers to 750 nanometers, nor in the infrareds with a wavelength greater than 750 nanometers.

[0075] Advantageously, the light emission spectrum of the lighting device 4 avoids to encourage photosynthesis in plants, in particular because it is located almost outside the absorption spectrum of chlorophyll a and mainly outside the absorption spectrum of chlorophyll b. In addition, the light emission spectrum of the lighting device 4 limits disturbance to animals, in particular insects.

Claims

Claims

1. Lighting device (4) comprising at least three LEDs (7, 8, 9), characterized in that each LED (7, 8, 9) is chosen only from the group comprising: - a first LED (7) emitting green light with a nominal wavelength between 513 nanometers and 543 nanometers, - a second LED (8) emitting amber light with a nominal wavelength between 583 nanometers and 605 nanometers, and - a third LED (9) emitting red-orange light with a nominal wavelength between 610 nanometers and 635 nanometers, the lighting device (4) comprising M first LEDs (7), N second LEDs (8) and P third LEDs (9), with N>1,M>1 and P>1

2. 1. Lighting device (4) according to claim 1, in which: - the set of N first LEDs (7) has a relative light intensity of between 0.39 and 0.43, - the set of M second LEDs (8) has a relative light intensity of between 0.62 and 0.68, and - the set of P third LEDs (9) has a relative light intensity equal to 1.

0.

3. Lighting device (4) according to claim 2, in which: - the set of N first LEDs (7) has a relative light intensity equal to 0.41, - the set of M second LEDs (8) has a relative light intensity equal to 0.

65.

4. A lighting device (4) according to any one of claims 1 to 3, wherein each of the P third LEDs (9) emits red-orange light with a nominal wavelength of between 620 nanometers and 635 nanometers.

5. Lighting device (4) according to any one of claims 1 to 4, wherein each LED (7, 8, 9) has a bandwidth of between 10 nanometers and 70 nanometers.

6. Lighting device (4) according to any one of claims 1 to 5, wherein the LEDs (7, 8, 9) are coplanar.

7. A lighting device (4) according to any one of claims 1 to 6, wherein P < M < N.

8. Lighting device (4) according to claim 7, wherein M = P and N = 2xM.

9. Lighting device (4) according to any one of claims 1 to 8, which is configured to emit light at a color temperature between 2230 and 2330 Kelvin, preferably equal to 2280 Kelvin.

10. Outdoor lamp post (1), comprising a mast (2) carrying a head (3), the head (3) comprising at least one lighting device (4) according to any one of claims 1 to 9.

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