Lighting module comprising beam dump

Abstract

A lighting module (100) configured to provide, in operation, module light (M1), the lighting module comprising: a first laser light source (102) configured to provide a first laser light (L1); a first wavelength converting element (104) configured to at least partly convert the first laser light into a first converted light (C1) having a first spectral distribution (S 1); a light exit window (112) configured to couple out the module light; a beam dump (108); and a wavelength beam splitter (106) configured to: split the first converted light at a cut-off wavelength (1c) into a first portion (C1,1) and a second portion (C1,2), convey the first portion toward the beam dump, and convey the second portion toward the light exit window; wherein the module light comprises the second portion of the first converted light; and wherein the beam dump comprises a photovoltaic cell (110) configured to convert the first portion of the first converted light received at the photovoltaic cell into electricity (E).

Description

[0001] Lighting module comprising Beam dump

[0002] TECHNICAL FIELD

[0003] The present disclosure relates generally to the field of lighting devices. More specifically, it relates to a lighting module comprising a beam dump.

[0004] BACKGROUND

[0005] Over the last decades the efficiency of light sources has increased enormously. This relates both to conventional light sources and to solid state lighting, such as LED and laser-based light sources. It is desired to further improve the efficiency of LED and laserbased light sources.

[0006] SUMMARY

[0007] One general aim of the present disclosure is to provide a more efficient lighting solution. Specifically, there is a desire to be able to efficiently make use of the generated light.

[0008] It is therefore an object of the present invention to meet at least some of the above-mentioned goals, and to provide an improved lighting solution.

[0009] This and other objects are achieved by means of lighting module and lighting method as defined in the appended independent claims. Other embodiments are defined by the dependent claims.

[0010] According to a first aspect of the present disclosure, a lighting module is provided. The lighting module is configured to provide, in operation, module light. The lighting module comprises a first laser light source, a first wavelength converting element, a light exit window, a beam dump, and a wavelength beam splitter. The first laser light source is configured to provide a first laser light. The first wavelength converting element is configured to at least partly convert the first laser light into a first converted light having a first spectral distribution. The light exit window is configured to couple out the module light. The wavelength beam splitter is configured to split the first converted light at a cut-off wavelength into a first portion and a second portion, convey the first portion toward the beam dump, and convey the second portion toward the light exit window. The module light comprises the second portion of the first converted light. The beam dump comprises a photovoltaic cell configured to convert the first portion of the first converted light received at the photovoltaic cell into electricity.

[0011] According to the invention, the lighting module comprises an electric component. The beam dump is configured to provide the electricity to the electric component to power the electric component. The electric component comprises at least one of an active cooling unit, the first laser light source, the second laser light source, an actuator, and an energy storage device.

[0012] Hence, said electricity may be used by the lighting module. For example, the lighting module may comprise an electronic circuit, a communication module, wherein said electricity may power the electronic circuit, the communication module. For example, said electricity may at least partly power the first laser light source.

[0013] The first wavelength converting element may absorb first laser light emitted by the first laser source. The first wavelength converting element may re-emit first converted light, having different spectral distribution than the first laser light. The wavelength beam splitter may split the converted light into a first portion and a second portion having different spectral distributions. The wavelength beam splitter splits the converted light at the cut-off wavelength, into the first portion and the second portion. For example, the wavelength beam splitter may direct first converted light having a wavelength above the cut-off wavelength in a first direction and may direct first converted light having a wavelength below the cut-off wavelength in a second direction.

[0014] With the present lighting module, the first portion of the first converted light is converted to electricity, and the second portion of the first converted light emitted as module light. The cut-off wavelength may be selected such that the first portion of the converted light comprises wavelengths which may be unwanted or unusable for the module light. Thus, the present lighting module may more efficiently make use of the generated light.

[0015] According to some embodiments, the lighting module may further comprise a second laser light source configured to provide a second laser light, and a second wavelength converting element. The second wavelength converting element may be configured to at least partly convert the second laser light to a second converted light having a second spectral distribution different from the first spectral distribution. The first spectral distribution may comprise a spectral subrange overlapping with at least part of the second spectral distribution. The first portion may correspond to the spectral subrange overlapping with at least part of the second spectral distribution. According to some embodiments, the lighting module may further comprise a wavelength beam combiner. The wavelength beam combiner may be configured to receive the second portion of the first converted light and the second converted light. The wavelength beam combiner may be configured to combine the second portion of the first converted light and the second converted light. The wavelength beam combiner may be configured to convey the combined light toward the light exit window. The module light may further comprise the second converted light.

[0016] According to some embodiments, the wavelength beam combiner may comprise a first dichroic mirror. The first dichroic mirror may be configured to transmit the second portion of the first converted light and reflect the second converted light, such that the second portion of the first converted light and the second converted light are combined. The first dichroic mirror may be configured to transmit the second converted light and reflect the second portion of the first converted light, such that the second portion of the first converted light and the second converted light are combined.

[0017] According to some embodiments, the wavelength beam splitter may comprise a second dichroic mirror. The second dichroic mirror may be configured to transmit the first portion of the first converted light and reflect the second portion of the first converted light, such that the first portion of the first converted light and the second portion of the first converted light are split. The second dichroic mirror may be configured to transmit the second portion of the first converted light and reflect the first portion of the first converted light, such that the first portion of the first converted light and the second portion of the first converted light are split.

[0018] According to some embodiments, the cut-off wavelength may correspond to an end point of the second spectral distribution that is within the first spectral distribution. The spectral subrange overlap may be at least 20 nm.

[0019] The end point of the second spectral distribution may be equal to, within 10 nm, or within 10% of the peak width of the second spectral distribution.

[0020] According to some embodiments, the first spectral distribution may have a full-width-half-max of at least 50 nm. The second spectral distribution may have a full-widthhalf-max of at least 50 nm. The spectral subrange overlap may be at least 30 nm. The cut-off wavelength may be in a wavelength range 500-650 nm.

[0021] According to some embodiments, the first wavelength converting element may comprise a first phosphor having a first peak emission wavelength (XI). The second wavelength converting element comprises a second phosphor having a second peak emission wavelength (X2). The first and second peak emission wavelengths may be related as: X2>Xl+20nm, where XI may be in a wavelength range 500- 560 nm, and X2 may be in a wavelength range 540-630 nm. The first and second peak emission wavelengths may be related as: Xl>X2+20nm, where X2 may be in a wavelength range 500-560 nm, and XI may be in a wavelength range 540-630 nm.

[0022] According to some embodiments, the first and second phosphor may be of the type AsBsOn Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

[0023] According to some embodiments, the lighting module may further comprise a further wavelength beam splitter. The lighting module may further comprise a heatsink. The lighting module may further comprise a first optical element. The lighting module may further comprise a second optical element. The first wavelength converting element may be physically separated from the first laser light source. The first wavelength converting element may be arranged on the heatsink. The further wavelength beam splitter may be arranged between the first laser light source and the first wavelength converting element. The further wavelength beam splitter may be configured to transmit the first laser light and reflect the first converted light. The further wavelength beam splitter may be configured to reflect the first laser light and transmit the first converted light. The first optical element may be arranged between the first laser light source and the further wavelength beam splitter to collimate the first laser light emitted by the first laser light source. The second optical element may be arranged between the first wavelength converting element and the further wavelength beam splitter to focus the collimated first laser light received from the first optical element via the further wavelength beam splitter onto the first wavelength converting element and to collimate the first converted light.

[0024] According to some embodiments, the lighting module may further comprise an electric component. The beam dump may further be configured to provide the electricity to the electric component to power the electric component.

[0025] According to some embodiments, the electric component may comprise at least one of an active cooling unit, the first laser light source, the second laser light source, an actuator, an energy storage device.

[0026] The electricity generated by the beam dump may be used to power a unit within the lighting module itself. For example, the electricity may be used for cooling, e.g., by using a fan. By including an energy storage device, or battery, the electricity may be stored such that the electric component may be used the power of the lighting module is turned off or broken e.g., by using the battery having been charged by said electricity.

[0027] According to some embodiments, the electric component may comprise a third light source configured to emit third light having a third spectral distribution.

[0028] According to some embodiments, the module light may be white light having a correlated color temperature in a rage from 2000K to 9000K and a color rendering index of at least 70.

[0029] According to a further aspect of the present disclosure, a lighting arrangement is provided. The lighting arrangement comprises the lighting module of any of the preceding claims; and an electric component; wherein the beam dump is further configured to provide the electricity to the electric component. The electric component comprises at least one of the first laser light source, the second laser light source, an energy storage device, an actuator, a third light source configured to emit third light having a third spectral distribution.

[0030] For example: According to a second aspect of the present disclosure, a lighting arrangement is provided. The lighting arrangement comprises a lighting module in accordance with any embodiment of the first aspect of the present disclosure. The lighting arrangement further comprises an energy storage device. The beam dump is further be configured to provide the electricity to the energy storage device to charge the energy storage device.

[0031] According to a third aspect of the present disclosure, a lighting method is provided. The lighting method comprises providing a first laser light. The lighting method comprises at least partly converting the first laser light to a first converted light having a first spectral distribution. The lighting method comprises splitting the first converted light at a cutoff wavelength into a first portion and a second portion. The lighting method comprises converting the first portion of the first converted light into electricity. The lighting method comprises emitting the second portion of the first converted light.

[0032] It is noted that other embodiments using all possible combinations of features recited in the above-described embodiments may be envisaged. Thus, the present disclosure also relates to all possible combinations of features mentioned herein.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] Exemplifying embodiments will now be described in more detail, with reference to the following appended drawings: Fig. l is a schematic illustration of a lighting module in accordance with some embodiments;

[0035] Fig. 2 is a schematic illustration of a lighting module in accordance with some embodiments;

[0036] Figs. 3a and 3b illustrate a first spectral distribution and a second spectral distribution of first and second converted light in accordance with some embodiments;

[0037] Fig. 4 is a schematic illustration of a lighting module in accordance with some embodiments;

[0038] Fig. 5 is a schematic illustration of a lighting arrangement in accordance with some embodiments.

[0039] As illustrated in the figures, the sizes of the elements and regions may be exaggerated for illustrative purposes and, thus, are provided to illustrate the general structures of the embodiments. Like reference numerals refer to like elements throughout.

[0040] DETAILED DESCRIPTION

[0041] Exemplifying embodiments will now be described more fully hereinafter with reference to the accompanying drawings in which currently preferred embodiments are shown. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and fully convey the scope of the invention to the skilled person.

[0042] With reference to Figure 1, a lighting module 100, in accordance with some embodiments, will be described.

[0043] The lighting module 100 comprises a first laser light source 102 configured to provide a first laser light Li. The first laser light Li is directed toward a first wavelength converting element 104, configured to, at least partly, convert the first laser light Li into a first converted light Ci. The first converted light Ci has a first spectral distribution. Two examples of such a first spectral distribution Si are illustrated in Figures 3a and 3b, respectively.

[0044] The first converted light Ci is directed toward a wavelength beam splitter 106. The wavelength beam splitter 106 is configured to split the first converted light Ci at a cutoff wavelength Ac into a first portion Ci,i and a second portion Ci,2. As is illustrated in Figures 3a and 3b, the wavelength beam splitter 106 may split the first converted light at the cut-off wavelength Ac, such that the first portion Ci,i has a spectral distribution Si,i comprising wavelengths above / below the cut-off wavelength Ac, and the second portion Ci,2 has a spectral distribution Si, 2 comprising wavelengths below / above the cut-off wavelength Ac.

[0045] In Figure 1, the wavelength beam splitter 106 is arranged to transmit the first portion Ci,i of the first converted light and reflect the second portion Ci,2 of the first converted light. However, depending on the relative arrangement of the different units of the lighting module, the wavelength beam splitter 106 may just as well be arranged to transmit the second portion Ci,2 of the first converted light and reflect the first portion Ci,i of the first converted light. The wavelength beam splitter 106 may for example be or comprise a dichroic mirror.

[0046] The first portion Ci,i of the first converted light is directed (or conveyed) toward a beam dump 108. The beam dump 108 comprises a photo-voltaic cell 110 configured to convert the first portion Ci,i of the first converted light received into electricity E. The second portion Ci,2 of the first converted light is directed (or conveyed) to a light a light exit window 112. The light exit window is configured to couple out the second portion Ci,2 of first converted light as module light Mi. The module light Mi may be white light. For example, the module light Mi may be white light having a correlated color temperature in a rage from 2000K to 9000K and a color rendering index of at least 70.

[0047] With a lighting module illustrated in Figure 1, a method in accordance with the third aspect of the present disclosure may be performed. The method comprises providing a first laser light Li, for example using the first laser light source 102. The method further comprises at least partly converting the first laser light Li to a first converted light Ci having a first spectral distribution Si, for example using the first wavelength converting element 104. The method further comprises splitting the first converted light Ci at a cut-off wavelength Ac into a first portion Ci,i and a second portion Ci,2, for example using the first wavelength beam splitter. The method further comprises converting the first portion Ci,i of the first converted light into electricity E, for example using the photovoltaic cell 110 of the beam dump 108, and emitting the second portion Ci,2 of the first converted light, for example using the light exit window 112.

[0048] With reference to Figure 2, a lighting module 200, in accordance with some embodiments, will be described. Similarly to the lighting module 100, described with reference to Figure 1, the lighting module 200 comprises a first laser light source 102, a first wavelength converting element 104, a wavelength beam splitter 106, a beam dump 108, and a light exit window 112. The first laser light source 102, the first wavelength converting element 104, the wavelength beam splitter 106, the beam dump 108, and the light exit window 112 may be equivalent to the corresponding units described above with reference to Figure 1.

[0049] The lighting module 200 further comprises second laser light source 214 configured to provide a second laser light L2. The second laser light L2 is directed toward a second wavelength converting element 216, configured to, at least partly, convert the second laser light L2 into a second converted light C2. The second converted light C2 has a second spectral distribution. Two examples of such a second spectral distribution S2 are illustrated in Figures 3a and 3b, respectively. As can be seen in Figures 3a and 3b, the second spectral distribution S2 is different from the first spectral distribution Si. However, the first spectral distribution Si comprises a spectral subrange Si,i overlapping with at least part of the second spectral distribution S2. In the lighting module 200, the first portion Ci,i of the first converted light, which is directed to the beam dump, corresponds to the spectral subrange Si,i overlapping with at least part of the second spectral distribution S2.

[0050] The second converted light C2 is directed toward a wavelength beam combiner 218. The wavelength beam combiner 218 is configured to receive the second portion Ci,2 of the first converted light and the second converted light C2. The wavelength beam combiner 218 is configured combine the second portion Ci,2 of the first converted light and the second converted light C2 and convey the combined light Cc toward the light exit window. The light exit window 112 is configured to couple out the combined light Cc as module light M2.

[0051] In Figure 2, the wavelength beam combiner 218 is configured to transmit the second portion Ci,2 of the first converted light and reflect the second converted light C2, to combine the second portion Ci,2 of the first converted light and the second converted light C2 as the combined light Cc. However, depending on the relative arrangement of the units of the lighting module 200, the wavelength beam combiner 218 may just as well be configured to transmit the second converted light C2 and reflect the second portion Ci,2 of the first converted light, to combine the second portion Ci,2 of the first converted light and the second converted light C2 as the combined light Cc. The wavelength beam combiner 218 may be or comprise a dichroic mirror.

[0052] With reference to Figures 3a and 3b, different first and second spectral distributions, and the relationship them between will be described.

[0053] Both Figures 3a and 3b illustrate a first spectral distribution Si of the first converted light Ci illustrated in Figures 1 and 2. The first spectral distribution Si has a first peak wavelength i. To generate the first spectral distribution Si, the first wavelength converting element may comprise a first phosphor having a first peak emission wavelength i.

[0054] The Figures also illustrate a second spectral distribution S2 of the second converted light C2 illustrated in Figures 1 and 2. The second spectral distribution S2 has a second peak wavelength A2. To generate the second spectral distribution S2, the second wavelength converting element may comprise a second phosphor having a second peak emission wavelength A2.

[0055] The first and / or second phosphor may be of the type AsBsOn Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

[0056] The first spectral distribution Si may have a full-width-half-max (FWHM) of at least 50 nm. The second spectral distribution may have a FWHM of at least 50 nm.

[0057] There is a spectral subrange overlap between the first spectral distribution Si and the second spectral distribution S2. The overlap may be at least 20 nm, such as at least 30 nm. The cut-off wavelength Ac, is selected such that the first portion Ci,i of the first converted light corresponds to the spectral subrange Si,i overlapping with the second spectral distribution S2. The cut-off wavelength may for example correspond to an end point of the second spectral distribution S2 that is within the first spectral distribution Si. The cut-off wavelength Ac may be in a wavelength range 500-650 nm.

[0058] In the example illustrated in Figure 3a, the first peak wavelength Ai is shorter than the second peak wavelength A2. Thus, the spectral subrange overlap, and the first portion Ci,i of the first converted light, correspond to an upper region Si,i of the first spectral distribution. For example, the first peak wavelength Aimay be at least 20 nm longer than the second peak wavelength A2, i.e., Ai> 2+20nm. The first peak wavelength Ai may be in a wavelength range 540-630 nm, and the second peak wavelength 2 may be in a wavelength range 500-560 nm

[0059] In the example illustrated in Figure 3b, the first peak wavelength Ai is longer than the second peak wavelength A2. Thus, the spectral subrange overlap, and the first portion Ci,i of the first converted light, correspond to a lower region Si,i of the first spectral distribution. For example, the second peak wavelength 2 may be at least 20 nm longer than the first peak wavelength Ai, i.e., 2> Ai+20nm. The first peak wavelength Ai may be in a wavelength range 500-560 nm, and the second peak wavelength 2 may be in a wavelength range 540-630 nm. With reference to Figure 4, a lighting module 400, in accordance with some embodiments, will be described.

[0060] Figure 4 illustrates a portion of the lighting module 400. Thus, similarly to the lighting modules 100, 200 described with reference to Figures 1 and 2, the lighting module 400 comprises a first laser light source 102 and a first wavelength converting element 104. The lighting module 400 may further comprise elements, such as a wavelength beam splitter 106, a beam dump 108, and a light exit window 112, as illustrated in Figures 1 and 2, although not illustrated in Figure 4.

[0061] In the present lighting module 400, the first laser light Li is directed to a first optical element 422, which is arranged and configured to collimate the first laser light Li. The collimated light is deflected by a further wavelength beam splitter 426 onto a second optical element 424, which is arranged and configured to focus the collimated laser light onto the first wavelength converting element 104. The first wavelength converting element 104 of the lighting module 400 is arranged on a heatsink 420, and physically separated from the first laser light source.

[0062] The first converted light Ci, converted by the first wavelength converting element 104, is emitted towards the second optical element 424, which is arranged and configured to collimate the first converted light Ci. The further wavelength beam splitter 426 is configured to transmit the first converted light Ci, e.g., toward a light exit window 112, as in Figure 1, or toward a wavelength beam combiner 218, as in Figure 2.

[0063] In Figure 4, the further wavelength beam splitter 426 is arranged between the first laser light source 102 and the first wavelength converting element 104, to reflect the first laser light Li and transmit the first converted light Ci. However, depending on the relative arrangement of the other elements, the further wavelength beam splitter 426 may just as well be arranged between the first laser light source 102 and the first wavelength converting element 104, to transmit the first laser light Li and reflect the first converted light Ci. With reference to Figure 5, a lighting arrangement 550, and a lighting module 500, in accordance with some embodiments, will be described.

[0064] The lighting module 500 comprises a first laser light source 102, a first wavelength converting element 104, a wavelength beam splitter 106, a beam dump 108, and a light exit window 112, which may be equivalent to corresponding elements described above with reference to preceding embodiments and Figures.

[0065] However, the lighting module 500 further comprises a plurality of optional electric components, including an active cooling unit 528, an actuator 530, a sensor 532 and a third light source 534. The lighting module further comprises an optional energy storage unit 536, e.g., a battery 536.

[0066] The beam dump 108 is configured to provide the electricity E generated by the photovoltaic cell 110 to at least one of the electric components 528, 530, 532, 534, the battery 536, and the first laser light source 102.

[0067] The cooling unit 528, illustrated as a fan, may be configured to cool at least a portion of the lighting module 500. The actuator 530 may be configured to move at least a portion of the lighting module 500, e.g., to redirect the module light M3. The sensor 532 may be configured to detect an internal property of the lighting module 500, e.g., a temperature of the lighting module, or an external property, such as surrounding light. The third light source 534 may be configured to emit third light L3 having a third spectral distribution. The lightexit window may be configured to couple out the third light L3 as part of the module light M3.

[0068] The battery 536 may be configured to store electrical energy E provided by the beam dump, and to provide electricity E to at least one of the electric components 528, 530, 532, 534, and the first laser light source 102.

[0069] The lighting arrangement 550 comprises the lighting module 500 and an energy storage device 522. The beam dump 108 may be configured to provide the electricity E generated by the photovoltaic cell 110 to the energy storage device 522 to charge the energy storage device 522.

[0070] The person skilled in the art realizes that the present invention by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims.

[0071] Although features and elements are described above in particular combinations, each feature or element can be used alone without the other features and elements or in various combinations with or without other features and elements.

[0072] Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain features are recited in mutually different dependent claims does not indicate that a combination of these features cannot be used to advantage.

Claims

CLAIMS:

1. A lighting module (100) configured to provide, in operation, module light (Mi), the lighting module comprising: a first laser light source (102) configured to provide a first laser light (Li); a first wavelength converting element (104) configured to at least partly convert the first laser light into a first converted light (Ci) having a first spectral distribution (Si); a light exit window (112) configured to couple out the module light; a beam dump (108); an electric component, and a wavelength beam splitter (106) configured to: split the first converted light at a cut-off wavelength (> ) into a first portion (Ci,i) and a second portion (Ci,2), convey the first portion toward the beam dump, and convey the second portion toward the light exit window ; wherein the module light comprises the second portion of the first converted light; and wherein the beam dump comprises a photovoltaic cell (110) configured to convert the first portion of the first converted light received at the photovoltaic cell into electricity (E) and to provide the electricity to the electric component to power the electric component, wherein the electric component is at least one of the first laser light source, the second laser light source, an energy storage device, an actuator, a third light source (534) configured to emit third light (L3) having a third spectral distribution2. The lighting module (200) according to claim 1, further comprising: a second laser light source (214) configured to provide a second laser light (L2); a second wavelength converting element (216) configured to at least partly convert the second laser light to a second converted light (C2) having a second spectral distribution (S2) different from the first spectral distribution;wherein the first spectral distribution comprises a spectral subrange (Si,i) overlapping with at least part of the second spectral distribution; and wherein the first portion corresponds to the spectral subrange overlapping with at least part of the second spectral distribution.

3. The lighting module of claim 2, further comprising a wavelength beam combiner (218) configured to: receive the second portion of the first converted light and the second converted light; combine the second portion of the first converted light and the second converted light; and convey the combined light toward the light exit window; wherein the module light (M2) further comprises the second converted light.

4. The lighting module of claim 3, wherein: the wavelength beam combiner comprises a first dichroic mirror configured to: transmit the second portion of the first converted light and reflect the second converted light, or transmit the second converted light and reflect the second portion of the first converted light, such that the second portion of the first converted light and the second converted light are combined; and the wavelength beam splitter comprises a second dichroic mirror configured to: transmit the first portion of the first converted light and reflect the second portion of the first converted light, or transmit the second portion of the first converted light and reflect the first portion of the first converted light, such that the first portion of the first converted light and the second portion of the first converted light are split.

5. The lighting module of any of claims 2-4, wherein the cut-off wavelength corresponds to an end point of the second spectral distribution that is within the first spectral distribution, and wherein the spectral subrange overlap is at least 20 nm.

6. The lighting module of claim 5, wherein: the first spectral distribution has a full-width-half-max of at least 50 nm; the second spectral distribution has a full-width-half-max of at least 50 nm; the spectral subrange overlap is at least 30 nm; and the cut-off wavelength is in a wavelength range 500-650 nm.

7. The lighting module of any of claims 2-6, wherein: the first wavelength converting element comprises a first phosphor having a first peak emission wavelength, I; the second wavelength converting element comprises a second phosphor having a second peak emission wavelength, X2; and wherein:X2>Xl+20nm, where XI is in a wavelength range 500-560 nm, and X2 is in a wavelength range 540-630 nm, orXl>X2+20nm, where X2 is in a wavelength range 500-560 nm, and XI is in a wavelength range 540-630 nm.

8. The lighting module of claim 7, wherein the first and second phosphor are of the type AsBsO Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

9. The lighting module of any of the preceding claims, further comprising: a further wavelength beam splitter (426); a heatsink (420); a first optical element (422); and a second optical element (424); wherein: the first wavelength converting element is physically separated from the first laser light source; the first wavelength converting element is arranged on the heatsink; the further wavelength beam splitter is arranged between the first laser light source and the first wavelength converting element; the further wavelength beam splitter is configured to: transmit the first laser light and reflect the first converted light, orreflect the first laser light and transmit the first converted light; the first optical element is arranged between the first laser light source and the further wavelength beam splitter to collimate the first laser light emitted by the first laser light source; the second optical element is arranged between the first wavelength converting element and the further wavelength beam splitter to focus the collimated first laser light received from the first optical element via the further wavelength beam splitter onto the first wavelength converting element and to collimate the first converted light.

10. The lighting module of any of the preceding claims, wherein the module light is white light having a correlated color temperature in a rage from 2000K to 9000K and a color rendering index of at least 70.

11. A lighting arrangement comprising: the lighting module of any of the preceding claims; and an energy storage device (552); wherein the beam dump is further configured to provide the electricity to the energy storage device to charge the energy storage device.

12. A lighting method comprising: providing a first laser light; at least partly converting the first laser light to a first converted light having a first spectral distribution; splitting the first converted light at a cut-off wavelength into a first portion and a second portion; converting the first portion of the first converted light into electricity; and emitting the second portion of the first converted light.

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