EP2981759A1

EP2981759A1 - Led module, luminaire comprising same and method for influencing a light spectrum

Info

Publication number: EP2981759A1
Application number: EP14715837.2A
Authority: EP
Inventors: Jens Burmeister; Lisa MORR
Original assignee: Eaton Protection Systems IP GmbH and Co KG
Current assignee: Eaton Intelligent Power Ltd
Priority date: 2013-04-05
Filing date: 2014-04-02
Publication date: 2016-02-10
Anticipated expiration: 2034-04-02
Also published as: CN105378375A; TWI582337B; US20160040859A1; DE102013005934A1; EP2981759B1; CN109838762A; WO2014161665A1; TW201447170A

Abstract

The invention relates to an LED module (1) for a luminaire (2), said module comprising at least one LED support (3) and a plurality of LEDs (light-emitting diodes) (4) arranged on said support. The intensities of different coloured LEDs (4) are selected in particular in order to emit a total light emission spectrum (6) that is a combination of the individual light emission spectra (5) of each LED. The invention also relates to a luminaire (2) comprising a luminaire housing (10), at least one LED module (1) provided in the luminaire housing (10) as a light source (13), a light exit opening (11) formed in the luminaire housing (10), and a glare-limiting device (12) associated in particular with the light exit opening (11). The invention further relates to a method for influencing a light spectrum of a light source (13).

Description

LED module, luminaire with such and method of influencing a

light spectrum

The invention relates to an LED module, a luminaire with such an LED module and a method for influencing a light spectrum. A light spectrum or color spectrum is a part of the electromagnetic spectrum that can be perceived by the human eye without any further technical aids. Such a light spectrum is composed of emitted or reflected spectral colors of a corresponding light source or of light sources. As a rule, such a light source emits light with a specific frequency spectrum or corresponding spectral distribution, the corresponding frequencies of the light determining its color. Corresponding artificial light sources differ in color, brightness, etc., with a visible portion of the light spectrum having a wavelength in the range of about 380 to 780 nm and frequencies in the range of about 3.8 x 10 ¹⁴ to 7.9 x 10 ¹⁴ Hz, respectively , Without optical aids corresponding color components of the light spectrum are indistinguishable, many light sources usually give off a light spectrum as a combination of different individual colors that lead in the eye of a viewer to a total color impression or a mixed color. Such a light color corresponds to a color impression of the light, which comes directly from a corresponding self-luminous light source. The light color depends on the spectral composition of this radiation.

With regard to the color of the light, even a "white" light results in different subdivisions, such as warm white, neutral white, daylight white, etc. Each of these corresponding shades has a different effect on the human being It should also be noted in connection with other species that they usually have different sensitivities to certain spectral ranges in comparison to humans.

In connection with the light color, another parameter has to be considered, which is called the color rendering index. This index is a photometric quantity that describes the quality of the color reproduction of light sources of the same correlated color temperature. As a reference for judging the reproduction quality, for example, up to a color temperature of 5000 K, the light emitted from a black body of a corresponding color temperature 5 is used. The color rendering index is "100" when a corresponding artificial light source perfectly reproduces the spectrum of a blackbody having the same color temperature in the range of visible wavelengths.

An example of recently used light sources are LED light sources that consume little energy while having a long life. Corresponding LEDs typically generate substantially monochromatic radiation, with the hue of the corresponding LED light being dominated by the dominant wavelength of the corresponding radiation. There are LEDs in different colors, such as red, orange, yellow, green or even blue. Also known are white LEDs, which typically use a conversion layer to convert blue light that is actually generated by the LED into white light. Such conversion layers are also known from fluorescent lamps.

A corresponding emission spectrum of an LED is relatively narrow-band, wherein, see the previous statements, a corresponding dominant wavelength and thus the color of the light is dependent on the materials used to produce a corresponding semiconductor crystal of the LED. As a rule, LED light contains no UV or IR radiation.

LEDs are preferably manufactured as LED modules. These are very shallow and wise ^{! :} a plurality of LEDs on a support, wherein such a support may also be flexible. The carrier may be a printed circuit board equipped with appropriate wiring and / or electronic components for actuating the LEDs.

DE 10 2010 033 141 describes a luminaire in which the generated light is influenced with respect to spectral sensitivities of different species. As the light source of such a lamp, for example, a previously described LED module or more of these is used. In order to influence the corresponding light, a filter device is used which at least partially filters out one or more specific spectral regions of the emitted light. This will filtered or at least attenuated spectral regions in which certain species and in particular animals have a higher sensitivity and in which spectral regions these species are optionally adversely affected. It is of course also conceivable that the spectral range of the light to be emitted is selected such that it positively influences one or more species. The corresponding lamp can be used for example for street lighting or for lighting sidewalks or even in a lighting in parks or the like.

It is of course also possible to perform a corresponding filtering for light in rooms in which certain spectral ranges of the emitted light could trigger reactions or the like, see for example biological, chemical or physical applications.

In DE 10 2010 033 141 a corresponding filter device in the luminaire housing or in the region of a light exit opening of the lamp housing is arranged. D. h., The influence of the corresponding light spectrum or color spectrum of the light source is effected by an additional device. Disadvantage of such a device is that a portion of the light is retained, and therefore the effectiveness of the entire lighting system is reduced. In other words, when filtering, the radiant power or radiant intensity decreases compared to a luminaire without filtering with the same power supply. The invention is therefore based on the object to allow influencing the light or color spectrum in a simple manner, without major structural changes or additional installations are to be made in a corresponding lamp, with only a small number of lights is used.

The object is achieved by the features of claim 1. This applies analogously to the features of the method claim and a corresponding lamp with such an LED module.

According to the invention, the LED module is distinguished by the fact that, given a particular number and color of the LEDs, these emit a total light emission spectrum composed of individual light emission spectra of each LED, wherein the LEDs can be varied relative to one another in the intensities of their individual light emission spectra. That is, there will be certain numbers of red, green, blue, and / or yellow LEDs are used on the LED module, each of these LEDs is adjustable in intensity, so that by varying the individual intensities of the corresponding light emission spectra and then superimposing these spectra results in the total light emission spectrum.

The corresponding luminaire has at least one LED module, and several such modules can be used. Furthermore, such a luminaire has at least one luminaire housing, a light exit opening formed in the luminaire housing, and a glare limitation device. By this, the exit of the light from the light exit opening of the lamp is limited to a certain range, for example, to reduce a glare of the lamp.

According to the method, the corresponding light color of the light emitted by the light is influenced in such a way that a plurality of LEDs are arranged at least in a row and / or a column on a corresponding LED module. Each of the LEDs emits light according to a single light emission spectrum with a correspondingly set intensity, the individual spectra of all LEDs superimposing on a total light emission spectrum which gives the light spectrum of the light source of the corresponding luminaire.

There is the possibility that each LED is designed to emit a substantially monochromatic light radiation. The corresponding individual light emission spectrum of each LED is known per se or at least detectable beforehand. LEDs with different monochromatic light radiation are then arranged together on the corresponding LED carrier and by superposition of the individual light emission spectra with the respective intensity to form a total light emission spectrum, the correspondingly desired light spectrum of the light source results.

It is possible that LEDs with the same monochromatic light radiation are each arranged on a submodule of the LED module. This means that LEDs with the same monochromatic light radiation are arranged together and, depending on the required number of corresponding LEDs, submodules are combined with such LEDs. The LEDs are arranged relatively close to each other, so that even at a small distance and optionally with the aid of appropriate reflection means no punctiform light sources are more recognizable, but only the superimposition of all individual light emission spectra to the total light emission spectrum is recognizable to a viewer.

By using sub-modules, it is possible in a simple manner to combine LEDs with the corresponding light color as required and also to select them in terms of their number. For example, if more yellow LEDs are needed, more sub-modules will be added with those yellow LEDs. This applies analogously for differently colored LEDs.

However, there is also the possibility that LEDs with different monochromatic light radiation are arranged on a submodule of the LED module. In other words, a desired light color is already provided on a submodule by combining differently colored LEDs of corresponding intensity on this submodule. A number of such sub-modules can then be used together as an LED module and these give the desired total light emission spectrum.

When the LEDs are arranged, they are arranged along at least one row and / or one column on the corresponding LED carrier. As already stated in the introduction, such a carrier can be a corresponding printed circuit board for supplying the LEDs, for the corresponding wiring for required connections and also for arranging further electronic or electrical devices.

In the case of such a row and / or column arrangement, there is the possibility that, for example, only LEDs of the same color or correspondingly along a column such LEDs are arranged along a row. It is also conceivable that differently colored LEDs are provided in each row and / or column.

According to the invention, it is particularly advantageous in this context if each LED can be controlled individually, ie in particular supplied with the appropriate voltage or current. As a result, all the LEDs are reliably controlled and the corresponding emitted individual light emission spectrum is well reproducible with its corresponding intensity and in addition of all individual emission spectra, the total light emission light spectrum can be produced safely. It is also possible that all the same color LEDs are supplied with selected voltage or current accordingly. To optionally increase the color rendering index of the corresponding light source, the monochromatic LEDs may be associated with white LEDs. The number of white LEDs, for example, can be determined by the color rendering index to reach a value of 100 or at least close to 100. In order to be able to easily change the overall light emission spectrum, it is conceivable that modules and / or sub-modules are arranged interchangeably in the luminaire. This can apply analogously to the corresponding LED carrier.

In order to possibly change the light color of the light source at short notice, it may also prove advantageous if the submodules can be controlled individually. This means that, for example, a submodule with only yellow LEDs is only switched on if the total light emission spectrum is to be changed accordingly by connecting these yellow LEDs. This applies analogously to differently colored LEDs, white LEDs and the like.

As already explained above, such an adaptation of the total light emission spectrum can be carried out, in particular with regard to certain species which have a higher sensitivity in a spectral range. It is also conceivable that the adaptation of the total light emission spectrum with respect to more than one species takes place if they have the same sensitivity in a specific spectral range or at least in closely adjacent spectral ranges. According to the invention, it is also possible to amplify a specific spectral range by connecting LEDs with regard to light emission, if the LEDs to be switched on shine, for example, in this spectral range. Thereby, certain advantageous effects in the specific spectral range can be increased.

There is also the possibility that the light spectrum is changed not only by connecting corresponding LEDs, but also by deliberately switching off certain LEDs with a known individual light emission spectrum. Also by such switching off of LEDs and optionally varying the intensities of the remaining LED's results in a change in the total light emission spectrum, which may have the desired effect. In the following, advantageous embodiments will be described with reference to the accompanying figures in the drawing. Show it:

Figure 1 is a perspective view from below of a lamp with LED modules;

FIG. 2 shows an enlarged illustration of an exemplary embodiment of a LED

module; Figure 3 is an enlarged view of another embodiment of a

LED module;

FIG. 4 individual light emission spectra of different intensities for differently colored LEDs;

FIG. 5 shows a total light emission spectrum resulting from the individual light emission spectra shown in FIG. 4;

Figure 6 shows another example analogous to Figure 4, and

FIG. 7 shows a total light emission spectrum from individual light emission spectra according to FIG

FIG. 6.

FIG. 1 shows a perspective view obliquely from below of a luminaire 2 with an LED module 1 according to the invention. In the exemplary embodiment shown, corresponding LED modules 1 are arranged as light source 13 on both sides of a light exit opening 11 in a luminaire housing 10. The LED modules 1 are both simultaneously controlled and supplied with voltage or current. The illustrated luminaire 2 is shown only by way of example and simplified, wherein it can be used, for example, to illuminate paths, roads or the like. In order to avoid or at least reduce an existing glare effect of the corresponding light means within the luminaire 2, the light exit opening 11 may be associated with a glare limiting device 12, which, for example, reduces the light exit opening 11 in the direction of the surface to be irradiated and optionally additionally borrowed from the light source emitted light is limited to only a certain area for illumination.

There are different embodiments for a corresponding LED module 1 conceivable, in the figures 2 and 3, two embodiments are shown. In the embodiment according to FIG. 2, an arrangement of corresponding LEDs 4 takes place along a row 8. The LEDs 8 are all arranged on an LED carrier 3, which is designed, for example, as a printed circuit board. The LED carrier 3 with LEDs 4 according to FIG. 2 or also according to FIG. 3 forms a corresponding LED module 1. It should again be pointed out that, for example, the arrangement and number of LEDs 4 on the corresponding LED carrier 3 are exemplary only and with a small number of LEDs 4 is shown. It is also possible to use more LED carrier 3 or LED modules 1 in the luminaire 2 according to FIG.

The different LEDs 4 on the carrier 3 are LEDs of different colors and, depending on the color, have a different single-light emission spectrum, see also FIGS. 4 and 6. LEDs are essentially monochromatic light sources, ie. H. they emit light only in a narrowband or limited spectral range. By selective selection of appropriate semiconductor materials and their doping, the properties of the light generated by LEDs can be varied. Today, there are LEDs of red, orange, yellow, green, blue and violet color. Also beyond this visible range of the light spectrum radiation can be produced by LEDs, see, for example, the near infrared range up to a wavelength of 1000 nm or even the ultraviolet range.

In order to produce white light with a light emitting diode, for example, a blue or UV LED is used, with additional photoluminescent material. Similar to fluorescent tubes, this material converts the short-wave and higher-energy light into longer-wave light.

A corresponding number of individual LEDs 4 of different colors are arranged on the LED module 1 or LED carrier 3, see, for example, green LEDs 14, yellow LEDs 15, orange LEDs 16, red LEDs 17, or white LEDs 18.

It should be noted once again that the arrangement and number of LEDs is only an example.

This applies analogously to Figure 3, in which the corresponding LEDs 4 are arranged both in rows and columns, wherein in the illustrated embodiment, five rows and ten columns of LEDs on the corresponding LED carrier 3 and LED module 1 are provided. Also in this module according to FIG. 3 differently colored LEDs can be arranged both along a row and a column.

There is also the possibility that a corresponding LED module 1 or LED carrier 3 is composed of sub-modules 7. These may, for example, each have a predetermined number of differently colored LEDs, or be equipped with only monochromatic LEDs. This applies analogously to the exemplary embodiment according to FIG. 3.

According to the invention, it has proven to be advantageous that the LEDs 4 are controlled differently on the corresponding carrier or by the corresponding module, ie. H. be individually supplied with voltage or power. In this way, the light output of each LED with respect to its individual light emission spectrum is predetermined and well known, so that the various individual light emission spectra can be superimposed on a total light emission spectrum, see the following explanations. However, it is also conceivable that the sub-modules are controlled separately, and this is particularly advantageous if each sub-module is occupied for example by LEDs of only one color. That is, for example, all of the yellow LEDs could be turned off or on or changed in intensity arranged on a specific sub-module 7. As a result, a corresponding individual light emission spectrum for the light color "yellow" would be absent or at least changed in intensity in the total light emission spectrum Furthermore, it is possible to provide several submodules with LEDs of the same color, so that, for example, a submodule with yellow LEDs, two such submodules or The above is also valid if differently colored LEDs are provided on each sub-module, so that fewer or more of such sub-modules are connected to each other as required for the corresponding illumination Luminaire be arranged or controlled in a lamp.

FIG. 4 shows an exemplary embodiment of an LED module 1 with a number of individual light emission spectra 5. From left to right in FIG. 4, an individual light emission spectrum for the color green is first, for the color yellow, for the color orange, and shown in red for the color. The intensities of the corresponding spectra are given as a function of the wavelength in nm, for example, the intensities for the green, red and orange LEDs are equal and substantially three times greater than for the yellow LEDs. If one is sufficiently far away from the corresponding light source 13, or the luminaire 2, the individual light emission spectra overlap to form a total light emission spectrum 6, see FIG. 5, in which no LEDs 4, see FIGS. 2 or 3, are more recognizable as individual light sources. That is, Figure 5 shows a mixture of four different LED types with different light colors, which may also be provided in different numbers. A corresponding total light emission spectrum 6 can already be assembled relatively well by appropriate computer simulation or the like from the individual light emission spectra known per se prior to construction of the lamp. D. h., It can be specifically realized a corresponding total light emission spectrum for predetermined lighting purposes in a corresponding light. A further exemplary embodiment is shown in FIGS. 6 and 7, wherein corresponding individual light emission spectra 5 for green, yellow, orange, and red LEDs are again shown from left to right in FIG. In this case, the corresponding LEDs are operated with certain percentages of their usual intensity, for example, the intensity of the red LED 37, 5%, the green LED 25%, the orange LED 100% and the yellow LED 87.5% respectively of the original or normal operating intensity. In this embodiment, the relative proportion of "green" is reduced compared to Figure 5. That is, for a species sensitive, for example, in the green region, a light source with a total light emission spectrum 6 would be advantageous according to Figure 7. Conversely, a light source with an overall light emission spectrum 6 according to FIG. 5 can be used if value is placed on an increased proportion in the green range.

The remaining parts of the total light emission spectrum according to FIGS. 5 and 7 are virtually unchanged. By appropriate selection of the number, the color and in particular the variation of the intensities of the various LEDs of a sub-module 7 or of the total th LED module 1 more total light emission spectra 6 can be realized as desired and required.

In connection with FIG. 2, reference has been made to a white LED 18, which may be provided in addition to the colored LEDs in order, for example, to increase the color reproduction index. Of course, in this context, it is possible to use several such white LEDs.

As explained above, the advantage of the present invention is that even with a relatively small number of LEDs, a controlled mixture of light is possible by using different intensities of the LEDs used in each case. For example, there is no need to change the overall light emission spectrum by turning on or off corresponding LEDs of a given color. That is, in the present invention, a corresponding spectral distribution with a small number of LEDs is possible. This is advantageous, for example, when small lamps are used which can only provide a small space for the arrangement of LEDs.

However, there is also the possibility that in addition to the variation of the intensities of the individual LEDs or at least the same color LEDs also and in addition to the intensity variation, a corresponding variation of the number and / or color of the LEDs.

Claims

claims

1. LED module (1) for a lamp (2) with at least one LED carrier (3) and arranged on this plurality of LEDs (4) (light-emitting diodes), in particular predetermined number and color, which for delivering a from individual light emission spectra (5) composite total light emission spectrum (6) in intensities of their individual light emission spectra are variable relative to each other.

2. LED module according to claim 1, characterized in that each LED (4) is designed to emit substantially monochromatic radiation.

3. LED module according to claim 1 or 2, characterized in that LEDs are arranged with the same monochromatic light radiation in each case on a sub-module (7) of the LED module (1).

4. LED module according to one of the preceding claims, characterized in that LEDs, each with different monochromatic light radiation on a sub-module (7) of the LED module (1) are arranged.

5. LED module according to one of the preceding claims, characterized in that LEDs along at least one row (8) and / or a column (9) on the LED carrier (3) can be arranged.

6. LED module according to one of the preceding claims, characterized in that all the LEDs are controlled separately.

7. LED module according to one of the preceding claims, characterized in that the monochromatic LEDs are associated with white LEDs to increase a color rendering index.

8. LED module according to one of the preceding claims, characterized in that the LED modules and / or submodules are interchangeable in the lamp can be arranged.

9. LED module according to one of the preceding claims, characterized in that the sub-modules (7) are individually controllable.

10. Lamp (2) with a lamp housing (10), at least one in

Luminaire housing (10) as a light source (13) arranged LED module (1) according to one of the preceding claims, one in the luminaire housing (10) formed light exit opening (1 1), and one in particular the light exit opening (11) associated with Blendbegrenzungseinrichtung (12).

11. A luminaire according to claim 10, wherein a total light emission spectrum of the luminaire is substantially free of spectral regions in which at least one specific species, in particular animal species, has a higher sensitivity compared to other species.

12. Lamp according to claim 10 or 11, wherein the lamp (2) can be used as a path lamp, street light or the like.

13. A method for influencing a light spectrum of a light source (13), which light source from a plurality of in particular rows (8) and / or columns (9) on an LED module (1) arranged single LEDs is formed, wherein individual emission spectra of Single LEDs, especially for a given number and color of the individual LEDs, are superimposed with variable intensity to a total light emission spectrum as the light spectrum of the light source.

14. The method according to claim 13, characterized by simultaneous and separate driving of all individual LEDs.

15. The method according to claim 13 or 14, characterized by individual activation of the individual LEDs on a submodule (7) for selecting the number of individual LEDs of a particular color.

16. The method according to any one of the preceding claims 13 to 15, characterized by driving a number of white LEDs in addition to the driven colored LEDs.