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CN-121986548-A - Lighting device and outdoor street lamp provided with such a device

CN121986548ACN 121986548 ACN121986548 ACN 121986548ACN-121986548-A

Abstract

The invention relates to a lighting device (4) comprising at least three LEDs (7, 8, 9), each LED (7, 8, 9) being selected from the group consisting of only a first LED (7) emitting green light with a nominal wavelength between 513 nm and 543 nm, a second LED (8) emitting amber light with a nominal wavelength between 583 nm and 605 nm, and a third LED (9) emitting red orange light with a nominal wavelength between 610 nm and 635 nm, the lighting device (4) comprising M first LEDs (7), N second LEDs (8) and P third LEDs (9), wherein M≥1, N≥1 and P≥1. The invention also relates to an outdoor street lamp comprising at least one such lighting device (4).

Inventors

  • Z. Stojanovic

Assignees

  • 林奈景观公司

Dates

Publication Date
20260505
Application Date
20240802
Priority Date
20230808

Claims (10)

  1. 1. A lighting device (4) comprising at least three LEDs (7, 8, 9), characterized in that each LED (7, 8, 9) is selected from the group consisting of only: A first LED (7) emitting green light with a nominal wavelength between 513 nm and 543 nm, -A second LED (8) emitting amber light having a nominal wavelength between 583 nm and 605 nm, and A third LED (9) emitting red orange light with a nominal wavelength between 610 nm and 635 nm, The lighting device (4) comprises M first LEDs (7), N second LEDs (8) and P third LEDs (9), wherein M is more than or equal to 1, N is more than or equal to 1 and P is more than or equal to 1.
  2. 2. The lighting device (4) according to claim 1, wherein: all M first LEDs (7) have a relative light intensity between 0.39 and 0.43, -All N second LEDs (8) have a relative light intensity between 0.62 and 0.68, and -All P third LEDs (9) have a relative light intensity equal to 1.0.
  3. 3. The lighting device (4) according to claim 2, wherein: All M first LEDs (7) have a relative light intensity equal to 0.41, -All N second LEDs (8) have a relative light intensity equal to 0.65.
  4. 4. A lighting device (4) according to any of claims 1 to 3, wherein each of the P third LEDs (9) emits red-orange light having a nominal wavelength between 620 and 635 nm.
  5. 5. The lighting device (4) according to any one of claims 1 to 4, wherein each LED (7, 8, 9) has a bandwidth between 10 and 70 nanometers.
  6. 6. The lighting device (4) according to any one of claims 1 to 5, wherein the LEDs (7, 8, 9) are coplanar.
  7. 7. The lighting device (4) according to any of claims 1 to 6, wherein p+.m+.n.
  8. 8. The lighting device (4) according to claim 7, wherein m=p and n=2×m.
  9. 9. The lighting device (4) according to any one of claims 1 to 8, the lighting device (4) being configured to emit light having a color temperature between 2200 and 2330 kelvin.
  10. 10. An outdoor lamppost (1) comprising a stem (2) carrying a head (3), the head (3) comprising at least one lighting device (4) according to any one of claims 1 to 9.

Description

Lighting device and outdoor street lamp provided with such a device Technical Field The present invention relates to the field of lighting, in particular to lighting devices and outdoor lampposts provided with such devices. Background Lighting devices are known, for example, from document US2017/0079108A1, which emit light in a spectrum visible to a human observer. Such lighting devices comprise for example a plurality of LEDs, also known as light emitting diodes, which make it possible to produce high intensity illumination over a broad spectrum visible to the human eye while limiting the electrical power consumption of these lighting devices. However, these lighting devices affect the biorhythms of plants and animals. Thus, these lighting devices affect plant growth, causing artificial photosynthesis, not by sunlight. Furthermore, these lighting devices are harmful to animals, such as insects, birds, fish and mammals. In practice, these lighting devices disrupt their growth, directional sense, phototactic or time biological cycle, such as their circadian rhythm. In fact, the light produced by these lighting devices, especially at night, forces the plants to photosynthesis and interfere with the animals. Disclosure of Invention In particular, it is an object of the present invention to provide a lighting device that allows comfortable lighting of humans while avoiding the promotion of photosynthesis of plants and the limitation of interference with animals. According to a first aspect, the present invention provides a lighting device comprising at least three LEDs, each LED being selected from only the group comprising, preferably from the group consisting of: a first LED emitting green light with a nominal wavelength between 513 nm and 543 nm, A second LED emitting amber light having a nominal wavelength between 583 nm and 605 nm, and A third LED emitting red orange light with a nominal wavelength between 610 nm and 635 nm, The lighting device comprises M first LEDs, N second LEDs and P third LEDs, wherein M is larger than or equal to 1, N is larger than or equal to 1 and P is larger than or equal to 1. Thus, the lighting device allows comfortable illumination of humans while avoiding promoting photosynthesis of plants and limiting interference with animals. More precisely, using three types of LEDs of different colors, preferably only three types of LEDs of different colors, makes it possible to obtain light from three colors, which is comfortable for humans because humans are trichromatic. Furthermore, the overall color of the light emitted by the lighting device is gold to a human observer and thus approximates the color of the light emitted by high-pressure sodium lamps widely used for urban lighting. Replacement of such high-pressure sodium lamps with the lighting device according to the invention does not change the visual habits of human observers who are used to night-time urban outdoor lighting with high-pressure sodium lamps. Furthermore, the light emission spectrum of the lighting device avoids promoting photosynthesis of the plant, 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 the disturbance to animals, in particular to insects. According to a second aspect, the invention also provides an outdoor lamppost comprising a stem carrying a head comprising at least one lighting device as described above. In practice, the overall color of the light emitted by the lighting device is gold, and thus approximates the color of the light emitted by high-pressure sodium lamps widely used for urban lighting. Replacement of such high-pressure sodium lamps with the lighting device according to the invention does not change the visual habits of human observers who are used to night-time urban outdoor lighting with high-pressure sodium lamps. For example, an outdoor lamppost provided with lighting devices provides comfortable lighting for humans. The invention is advantageously and optionally supplemented by the following features, considered individually or according to any technically possible combination thereof: -the lighting device is such that: all M first LEDs have a relative light intensity between 0.39 and 0.43, All N second LEDs have a relative light intensity between 0.57 and 0.68, preferably between 0.62 and 0.68, and All P third LEDs have a relative light intensity equal to 1.0. The overall color of the light emitted by the lighting device is thus gold for a human observer and thus comfortable for a human. -The lighting device is such that: All M first LEDs have a relative light intensity equal to 0.41, All N second LEDs have a relative light intensity equal to 0.65. The overall color of the light emitted by the lighting device is thus particularly gold for a human observer and thus particularly pleasant for a human. Each of the