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: Outdoor lighting device and lamppost 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. PRIOR TECHNOLOGY

[0002] Lighting devices are known which emit light in the spectrum visible to a human observer. Such lighting devices include, 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 power consumption of these lighting devices.

[0003] However, these lighting devices affect the biological rhythms of plants and animals. Specifically, they affect plant growth by inducing artificial photosynthesis, which does not result from sunlight. Furthermore, these lighting devices are harmful to animals, such as insects, birds, fish, and mammals. Indeed, these lighting devices disrupt their growth, orientation, phototaxis, or chronobiological cycles, such as their circadian rhythm. In fact, the generation of light by these lighting devices, particularly at night, forces photosynthesis in plants and disturbs animals. Description of the invention

[0004] The invention aims in particular to provide a lighting device which allows comfortable lighting for humans while avoiding encouraging plant photosynthesis 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 only 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 a 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>1,M>1 andP>1.

[0006] Thus, the lighting device provides comfortable lighting for humans while avoiding stimulating plant photosynthesis and limiting disturbance 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, since humans are trichromatic. Furthermore, the overall color of the light emitted by the lighting device is golden to 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. Replacing such a high-pressure sodium lamp with a lighting device according to the invention does not alter the visual habits of a human observer accustomed to nighttime urban outdoor lighting by high-pressure sodium lamps.Furthermore, the light emission spectrum of the lighting device avoids encouraging plant photosynthesis, notably because it lies almost entirely outside the absorption spectrum of chlorophyll a and primarily 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. Substituting such a high-pressure sodium lamp with a lighting device according to the invention does not alter the visual habits of a human observer accustomed to nighttime urban outdoor lighting by high-pressure sodium lamps. Thus, an outdoor streetlamp equipped with the lighting device provides comfortable lighting for humans.

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

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

[0011] - The lighting device is such that: - the first set of M LEDs has a relative luminous intensity equal to 0.41, - the second set of N second LEDs has a relative light intensity of 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 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 waveform between 620 nanometers and 635 nanometers, preferably between 620 nanometers and 632 nanometers.

[0014] - Each LED has a bandwidth between 10 nanometers and 70 nanometers. Thus, the limited bandwidth of each LED avoids encouraging plant photosynthesis and limits disturbances to animals.

[0015] - Each LED has a bandwidth between 10 nanometers and 40 nanometers, preferably between 16 and 30 nanometers. Thus, the particularly limited bandwidth of each LED avoids encouraging plant photosynthesis and significantly reduces 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 and red-orange LEDs. Therefore, it is advantageous to use a larger number of lower-power amber LEDs to reduce the overall cost of the lighting system.

[0017] - The lighting device is such that N = 2x M and / or N = 2x P. Thus, the distribution The use of LEDs is facilitated in order to emit homogeneous light from the lighting device.

[0018] - The lighting device is such that M = PetN = 2xM. Thus, the distribution of LED is particularly well-suited 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 presents 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 The use of LEDs is facilitated in order to emit homogeneous light from the lighting device.

[0021] - The lighting device is such that the LEDs are oriented parallel to each other to others. Thus, the arrangement of the LEDs is facilitated in order to emit a homogeneous light from the lighting device.

[0022] - The lighting device is such that the LEDs emit in directions main parallels between them. Thus, the arrangement of the LEDs is facilitated in order to emit homogeneous light from the lighting device.

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

[0024] - The lighting device is such that the LEDs are regularly distributed over the support, preferably with the LEDs distributed symmetrically around the center of the support.

[0025] - For every second LED, at least one first LED and at least one third The LEDs are the LEDs closest to the second LED. Thus, the light emitted by the lighting device has a colour distribution with improved homogeneity.

[0026] - The lighting device is configured to emit light at a temperature with a color temperature 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 lamppost is configured to provide outdoor lighting, nighttime preference.

[0028] - The outdoor lamppost is configured to provide outdoor lighting by urban environment.

[0029] - The outdoor lamppost comprises three aligned lighting devices, preferably placed side by side. 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 lamppost is configured to emit a luminous flux comprising Between 7500 and 8000 lumens, preferably 7800 lumens. This provides a significant luminous flux, sufficient for example for nighttime urban outdoor lighting.

[0031] - The mast has a height between 4 and 8 meters, preferably equal to 8 meters. Therefore, the area of ​​illumination provided by the outdoor lamppost is important.

[0032] - The head includes a housing. Thus, the housing protects the device lighting from inclement weather or damage.

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

[0034] - The case is made of aluminum.

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

[0036] [Fig.1] is a schematic side view of an embodiment of an outdoor lamppost;

[0037] [Fig.2] is a schematic perspective view of an embodiment of a head of the outdoor lamppost shown in [Fig.1];

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

[0039] [Fig.4] presents 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 as abscissa the wavelength in nanometers and having as ordinate the relative light intensity.

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

[0041] Fig. 1 represents an embodiment of an outdoor lamppost 1. The outdoor lamppost 1 comprises a mast 2 and a head 3. The mast 2 supports the head 3. The head 3 comprises at least one lighting device 4.

[0042] Advantageously, the outdoor lamppost 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, nighttime use of the outdoor street light 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 accommodates a power supply unit 6. The power supply unit 6 powers the lighting device 4.

[0049] Advantageously, the housing 5 includes 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 to allow the passage of power supply cables extending through the mast 2 into the housing 5.

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

[0051] Figure 2 represents one embodiment of head 3. In this example, head 3 includes three lighting devices 4.

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

[0053] Fig. 3 represents one 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 selected 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 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 datasheet version 1.16.

[0056] Advantageously, each of the N second LEDs 8 emits 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 datasheet version 1.6.

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

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

[0060] Advantageously, the lighting device 4 is such that: - the first M LEDs (7) have a relative luminous intensity between 0.39 and 0.43, - the set of N second LEDs 8 has a relative luminous intensity 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 first M LEDs together have a relative luminous intensity equal to 0.41, - the set of N second LEDs has a relative luminous intensity equal to 0.65.

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

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

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

[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 = 7 and N = 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 includes a support 10. Preferably, the LEDs 7, 8, 9 are arranged on the support 10.

[0068] Preferably, the support 10 is housed in the casing 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 principal 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 with respect 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] Figure 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, in terms of relative light intensity greater than 0.2, or even greater than 0.1, in the ultraviolet with wavelengths below 380 nm, nor in the violet with wavelengths between 380 and 450 nanometers, nor in the blue with wavelengths from 450 to 500 nanometers, nor in the red wavelengths from 650 nanometers to 750 nanometers, nor in the infrared with wavelengths greater than 750 nanometers.

[0075] Advantageously, the light emission spectrum of the lighting device 4 avoids encouraging plant photosynthesis, in particular because it is located almost entirely 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 disturbances to animals, in particular insects.

Claims

Demands

1. A lighting device (4) comprising at least three LEDs (7, 8, 9), characterized in that each LED (7, 8, 9) is selected solely from the group consisting of: - 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, wherein: - the first M LEDs (7) have a relative luminous intensity between 0.39 and 0.43, - the second N LEDs (8) have a relative luminous intensity between 0.62 and 0.68, and - the third P LEDs (9) have a relative luminous intensity equal to 1.

0.

3. Lighting device (4) according to claim 2, wherein: - the first M LEDs (7) have a relative luminous intensity of 0.41, - the second N LEDs (8) have a relative luminous intensity of 0.

65.

4. Lighting device (4) according to any one of claims 1 to 3, wherein each of the third LEDs (9) emits red-orange light with a nominal wavelength 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 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. 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 = 2 x M.

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

10. Outdoor lamppost (1), comprising a pole (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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