Bioluminescence based hybrid sources giving white light

Abstract

The invention provides a light generating system (1000) configured to provide system light (1001), wherein the light generating system (1000) comprises a first source (10) of first light (11) and a second source (20) of second light (21), wherein: (A) the first source (10) of first light (11) comprises a first bioluminescent material (410) configured to generate first bioluminescent material light (411) having a first spectral power distribution; (B) the second source (20) of second light (21) is configured to generate second light (21) having a second spectral power distribution different from the first spectral power distribution; wherein the second source (20) comprises one or more of (a) a first light generating device (100) configured to generate first device light (111), (b) a first luminescent material (210) configured to convert at least part of the first bioluminescent material light (411) received by the first luminescent material (210) into first luminescent material light (211); and (c) a second bioluminescent material (420) configured to generate second bioluminescent material light (421); wherein the second light (21) comprises one or more of the first device light (111), the first luminescent material light (211), and the second bioluminescent material light (421); and (C) the light generating system (1000) is configured to generate system light (1001) comprising in an operational mode of the light generating system (1000) the first light (11) and the second light (21).

Description

[0001] Bioluminescence based hybrid sources giving white light

[0002] FIELD OF THE INVENTION

[0003] The invention relates to a light generating system. The invention further relates to a lighting device comprising the light generating system.

[0004] BACKGROUND OF THE INVENTION

[0005] Bioluminescent light generating systems are known in the art. For instance, W02018087504A1, describes a system for lighting a decorative element, a facade of a building or a street furniture item by bioluminescence, including a bioreactor provided with an intake for a culture medium and at least one means for collecting a portion of the biomass, as well as tappings for connecting a circuit for circulating a culture medium which carries bioluminescent microorganisms, said circulation circuit comprising a set of at least partially transparent ducts and at least one circulation pump and one air pump, said system including a circuit for controlling the supply of culture medium, the addition of biomass and the removal of biomass, and at least one sensor of the biological status of the circulating microorganisms.

[0006] US2008 / 004533A1 discloses an optical imaging system including an electronic imaging device configured to capture an image of a site and a projector. The optical imaging system captures a fluorescent image of a surgical site and projects a visible representation of the captured image onto the surgical site during surgery.

[0007] WO2023 / 126202A1 discloses a light generating system comprising a first blue laser light source, a second blue laser light source that is different from the first one, a third red laser light source, a luminescent material, and a control system. The luminescent material is configured to generate luminescent material light having a centroid wavelength within the green-orange wavelength range. The light generating system generates light with a controllable spectral power distribution.

[0008] JPH11149801 A discloses luminous toys having a coloring agent added to a bioluminescence reaction system that results in luminescence of a desired color tone.

[0009] FR3122184A1 discloses a kit for the controlled emission of bioluminescence from a bioluminescent bacteria in the presence of oxygen. SUMMARY OF THE INVENTION

[0010] Several solutions to create white light are possible. Herein, it is proposed to use bioluminescence. However, bioluminescence is in general colored light. For functional lighting applications, however, it may be desirable to create white light. Further, it appears that using a bioluminescent plant it may especially be challenging to generate blue light.

[0011] Hence, it is an aspect of the invention to provide an alternative light generating system, which preferably further at least partly obviates one or more of above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0012] According to a first aspect, the invention provides a light generating system configured to provide system light. In embodiments, the light generating system may comprise a first source of first light and a second source of second light. Especially, in embodiments, the first source of first light may comprise a first bioluminescent material. In embodiments, the first bioluminescent material may be configured to generate first bioluminescent material light. Especially, in embodiments, the first bioluminescent material light may have a first spectral power distribution. Further, in embodiments, the second source of second light may be configured to generate second light. Especially, in embodiments, the second light may have a second spectral power distribution different from the first spectral power distribution. In embodiments, the second source may comprise a (solid state light source comprising) first light generating device configured to generate first device light. Additionally or alternatively, in embodiments the second source may comprise a first luminescent material configured to convert at least part of the first bioluminescent material light received by the first luminescent material into first luminescent material light. Additionally or alternatively, in embodiments, the second source may comprise a second bioluminescent material configured to generate second bioluminescent material light. Especially, in embodiments, the second light may comprise one or more of the first device light, the first luminescent material light, and the second bioluminescent material light. Yet further, in embodiments, the light generating system may be configured to generate system light comprising in an operational mode of the light generating system the first light and the second light. Hence, in embodiments, the invention provides a light generating system configured to provide system light, wherein the light generating system may comprise a first source of first light and a second source of second light, wherein: (A) the first source of first light may comprise a first bioluminescent material configured to generate first bioluminescent material light having a first spectral power distribution; (B) the second source of second light may be configured to generate second light having a second spectral power distribution different from the first spectral power distribution; wherein the second source may comprise one or more of (a) a first light generating device configured to generate first device light, (b) a first luminescent material configured to convert at least part of the first bioluminescent material light received by the first luminescent material into first luminescent material light, and (c) a second bioluminescent material configured to generate second bioluminescent material light; wherein the second light may comprise one or more of the first device light, the first luminescent material light, and the second bioluminescent material light; and (C) the light generating system may be configured to generate system light comprising in an operational mode of the light generating system the first light and the second light. The first bioluminescent material comprises a first living organism, and the second bioluminescent material comprises a second living organism.

[0013] With such a light generating system white light may be provided using bioluminescent light sources. The light generating system may especially be a hybridbioluminescence based system using bioluminescent plants or bacteria (configured to generate a single color) and combining such sources, optionally with electric light sources, to generate white light. Further, such a light generating system may provide decorative and / or synergistic effects, such as biological effects, by combining different types of (bioluminescent) light sources. Biological effects may relate to human centric lighting that benefits human health and well-being.

[0014] Bioluminescence is the production and emission of light by living organisms. It is a form of chemiluminescence. Bioluminescence occurs widely in marine algae, vertebrates and invertebrates, as well as in some fungi, microorganisms including some bioluminescent bacteria, and terrestrial arthropods such as fireflies. Various concepts making use of bioluminescence for (lighting) applications are actively being investigated. Such concepts can be classified as: bioluminescence in living plants, bioluminescence in living bacteria, and chemiluminescence (i.e. a reaction between luciferin and luciferase) not in living organisms. Bioluminescence in plants is for instance enabled via genetic engineering by e.g. inserting genes from a bioluminescent mushroom into the DNA of the target plants. These inserted mushroom genes relate to enzymes that convert caffeic acid, through a series of steps, into a luciferin that emits energy as light, before turning the resulting substance back into caffeic acid. The green luminescence produced by the caffeic acid cycle fits well with the optical transparency window of pigmented plant tissues. The plants glow both in the dark and in the daylight, with a greenish hue visible to the naked eye. Other colors are also possible by chemical modification, but green is the most abundant color for bioluminescence in terrestrial organisms and therefore most effective to be used in genetically modified plants. Instead of plants generating light, also bacteria may be used to generate photons. Bioluminescence in bacteria is e.g. being exploited in outdoor lighting applications. For example, a water-based bioluminescence process may be used. However, bioluminescence in aquatic organisms is limited to give a blue-green color because of the bad transmission in water of red light. Bioluminescence may also be used for data transmission such as optical wireless communication. Light produced by bioluminescent organisms may be of a higher frequency than that produced by artificial sources. Hence, bioluminescent lighting may have the potential to enhance the speed of data transmission. Here below, a general description of the invention is provided followed by some embodiments.

[0015] The light generating system may be configured to provide system light. Therefore, in embodiments, the light generating system may comprise the first source of first light and the second source of second light. The first source of first light may, in embodiments, especially comprise a first bioluminescent material. The first bioluminescent material may be configured to generate first bioluminescent material light having a first spectral power distribution. Especially, in embodiments, the first bioluminescent material light may have a first spectral power distribution in the visible wavelength range. For example, in embodiments, the first bioluminescent material light may comprise one of blue light, green light, yellow light, orange light, and red light. In embodiments, the first bioluminescent material light may especially be comprised by the system light.

[0016] In embodiments, the first bioluminescent material may comprise any type of bioluminescent material. Especially, in embodiments, the first bioluminescent material may comprise one or more of a bioluminescent plant, a bioluminescent fungus, a bioluminescent micro-organism, bioluminescent algae, and cultured bioluminescent material.

[0017] The second source of second light may, in embodiments, especially be configured to generate second light having a second spectral power distribution. Especially, in embodiments, the second source of second light may have a second spectral power distribution in the visible wavelength range. For example, in embodiments, the second light may comprise one of blue light, green light, yellow light, orange light, and red light. Especially, in embodiments, the second spectral power distribution may be different from the first spectral power distribution, however, this may not necessarily be the case. For example, in embodiments, the first source of first light and the second source of second light may generate light having complementary colors (e.g. red and cyan, green and magenta, or blue and yellow). In embodiments, the second light may especially be comprised by the system light. In embodiments, the second source may comprise a first light generating device configured to generate first device light. Especially, in such embodiments, the second source may comprise a solid state light source comprising first light generating device (i.e. a first light generating device comprising a solid state light source, such as a LED). Solid state light sources comprising light generating devices are described in more detail further below. Additionally or alternatively, in embodiments, the second source may comprise a first luminescent material. The first luminescent material may especially be configured to convert at least part of the first bioluminescent material light received by the first luminescent material into first luminescent material light. In embodiments, the first luminescent material may comprise essentially any type of luminescent material. Different possible types of luminescent materials are described in more detail further below. Additionally or alternatively, in embodiments, the second source may comprise a second bioluminescent material configured to provide second bioluminescent material light. In embodiments, the second bioluminescent material may comprise any type of bioluminescent material. Especially, in embodiments, the second bioluminescent material may comprise one or more of a bioluminescent plant, a bioluminescent fungus, a bioluminescent micro-organism, bioluminescent algae, and cultured bioluminescent material. The second source of second light may thus, in embodiments, comprise one or more of the (solid state light source comprising) first light generating device, the first luminescent material, and the second bioluminescent material. Hence, in embodiments, the second light may comprise one or more of the first device light, the first luminescent material light, and the second bioluminescent material light.

[0018] In embodiments, the light generating system may (also) comprise a vessel or other support. The vessel may, in embodiments, be configured to hold (or contain) at least the first source of first light (especially the first bioluminescent material). In embodiments, the vessel may comprise one or more of a pot, a jar, a container, a planter (box), a vase, a basin, an aquarium, etc., etc.... Especially, in embodiments, the vessel may comprise a light- transmissive material, such as e.g. glass or polymeric material. However, this may not necessarily be the case. For example, in embodiments, the vessel may comprise a ceramic (or plastic) pot configured to hold the bioluminescent plant. In other embodiments, the vessel may comprise a (light transmissive) container, such as a glass container, configured to hold the bioluminescent micro-organism. In embodiments, the second source of second light may be functionally coupled to the vessel (or other support) and may in embodiments be at least partly contained by the vessel. Alternatively or additionally, the second source of second light may be functionally coupled, such as attached, to the first bioluminescent material, especially when the latter comprises a bioluminescent plant (see also below).

[0019] The light generating system may be configured to generate system light. Following the above described, in embodiments, in an operational mode of the light generating system, the system light comprises the first light and the second light. In specific embodiments, the system light may comprise white light. Hence, in specific embodiments, the invention may provide bioluminescence based hybrid sources giving white light.

[0020] Therefore, in specific embodiments, (a) the first bioluminescent material may comprise one of a (partially) bioluminescent plant, a bioluminescent fungus, and a bioluminescent micro-organism, and (b) the second source of second light may comprise the first light generating device. Especially, in such embodiments, the second source of second light may comprise the solid state light source comprising first light generating device.

[0021] Such embodiments may be beneficial as (solid state light source comprising) light generating devices are available and selectable in a wide range of colors. Hence, by adding such a (solid state light source comprising) light generating device to the first bioluminescent material ((for instance in a complementary color) to the (color of the) bioluminescent material light) may provide a light generating system configured to provide white light in a relatively cheap, easy and reliable fashion. Furthermore, light generating devices, especially LEDs, are known to be very energy efficient in generating blue and red light, in contrast to green light. Hence, by using the first bioluminescent material to provide the green light, in combination with one or more first light generating devices (e.g. LEDs) to provide the blue and / or red light, a high efficacy may be obtained in a sustainable manner.

[0022] Herein, a light generating device may especially comprise a light source. The light source may especially be configured to generate light source light. In embodiments, the device light may essentially consist of the light source light. In other embodiments, the device light may essentially consist of converted light source light. In yet other embodiments, the device light may comprise (unconverted) light source light and converted light source light. Light source light may be converted with a luminescent material into luminescent material light and / or with an upconverter into upconverted light (see also below). The term “light generating device” may also refer to a plurality of light generating devices which may provide device light having essentially the same spectral power distributions. In (other) specific embodiments, the term “light generating device” may also refer to a plurality of light generating devices which may provide device light having different spectral power distributions. The term “light source” may in principle relate to any light source known in the art. In a specific embodiment, the light source comprises a solid state LED light source (such as an LED or laser diode (or “diode laser”)). The term “light source” may also relate to a plurality of light sources, such as 2-2000 (solid state) LED light sources. Hence, the term LED may also refer to a plurality of LEDs. Further, the term “light source” may in embodiments also refer to a so-called chip-on-board (COB) light source. The term “COB” especially refers to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of light emitting semiconductor light sources may be configured on the same substrate. In embodiments, a COB is a multi LED chip configured together as a single lighting module.

[0023] The light source may have a light escape surface. Referring to conventional light sources such as light bulbs or fluorescent lamps, it may be an outer surface of a glass or a quartz envelope. For LED’s it may for instance be the LED die, or when a resin is applied to the LED die, the outer surface of the resin. In principle, it may also be the terminal end of a fiber. The term escape surface especially relates to that part of the light source, where the light actually leaves or escapes from the light source. The light source may be configured to provide a beam of light. This beam of light (thus) escapes from the light exit surface of the light source. Likewise, a light generating device may comprise a light escape surface, such as an end window. Further, likewise a light generating system may comprise a light escape surface, such as an end window. A position where system light escapes from the light generating system may also be indicated as light exit. This may be a light transmissive window or an opening (in the system). The light transmissive window may in embodiments be provided by an optical component. The term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a laser diode, a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser (EEL), a photonic crystal surface emitting laser (PCSEL), a vertical external cavity surface emitting laser (VECSEL), etc... The term “light source” may also refer to an organic lightemitting diode (OLED), such as a passive-matrix (P MOLED) or an active-matrix (AMOLED). OLEDs may especially, in embodiments, comprise carbon-based materials configured to emit light when electricity is applied. In embodiments, organic light emitting diodes (OLEDs) may optionally (also) comprise a bioluminescent material. Using bioluminescent materials for the construction of such OLEDs may increase the (performance) efficiency, environmental friendliness, and cost-efficiency of lighting solutions (such as devices relying on optical data transmission) using such bioluminescence-based OLEDs.

[0024] In a specific embodiment, the light source comprises a solid-state light source (such as an LED or laser diode). In an embodiment, the light source comprises an LED (light emitting diode). The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). The term LED may also refer to a plurality of LEDs.

[0025] The light source may especially be configured to generate light source light having an optical axis (O), (a beam shape,) and a spectral power distribution. The light source light may in embodiments comprise one or more bands, having band widths as known for lasers.

[0026] The term “light source” may (thus) refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more of a luminescent material comprising element and (other) optics, like a lens, a collimator. A light converter element (“converter element” or “converter”) may comprise a luminescent material comprising element. For instance, a solid state light source as such, like a blue LED, is a light source. A combination of a solid state light source (as light generating element) and a light converter element, such as a blue LED and a light converter element, optically coupled to the solid state light source, may also be a light source (but may also be indicated as light generating device). Hence, a white LED is a light source (but may e.g. also be indicated as (white) light generating device). In embodiments, the term “light source” may also refer to a combination of a light source, like an LED, and an optical filter, which may change the spectral power distribution of the light generated by the light source. Especially, the term “light generating device” may be used to address a light source and further (optical components), like an optical filter and / or a beam shaping element, etc. The phrases “different light sources” or “a plurality of different light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from at least two different bins. Likewise, the phrases “identical light sources” or “a plurality of same light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from the same bin.

[0027] The term “solid state light source”, or “solid state material light source”, and similar terms, may especially refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, or a superluminescent diode.

[0028] In specific embodiments, the device light may be visible light, such as violet light, blue light, cyan light, green light, yellow light, amber light, orange light, and red light. . In embodiments, the first light generating device comprises a light source selected from a light emitting diode, a laser diode, and a superluminescent diode. Hence, especially the first light generating device may comprise a solid state light source.

[0029] Further, in embodiments, the first light generating device may comprise one or more (especially a plurality of) first light generating devices.

[0030] In embodiments, the second source of second light may comprise a solid state light source comprising first light generating device. In embodiments, it may be desired that the light generating system gives a white perception when looking at its optical exit window. In that case, the colors from the individual sources need to be mixed. In some embodiments, the first light generating device may be provided spatially separate from, but close to the first bioluminescent material. Therefore, in embodiments, it may be beneficial (for mixing the light of the different light sources) to use a miniaturized first light generating device. For example, in embodiments, the first light generating device may comprise a plurality of (micro)LEDs, optionally integrating various colors into a single LED. Similarly, in embodiments, instead of LEDs also laser light sources may be utilized. The laser light may enable a small-sized light source and may be combined with optical fibers for distribution of the light. Further, in embodiments, the first bioluminescent material may comprise a bioluminescent plant, e.g. placed in a vessel. In such embodiments, the desired white-light perception may be achieved by making the bioluminescent features of the plant very small, e.g. very small flowers or leaves. In addition, in such embodiments, the outside of the vessel may be made diffusive to further reduce any remaining non-uniformity of the color.

[0031] To obtain good color mixing, in embodiments, the light generating system may further comprise additional optics. Especially, in embodiments, the light generating system may comprise one or more of light combining optics, light homogenizing optics, light diffusing (and / or scattering) optics and light distributing optics. For example, in embodiments, the optics may comprise integrators, such as fly-eye lens array pairs or diffuser plates.

[0032] In other embodiments, the first light generating device may be configured physically attached to the first bioluminescent material. For example, in embodiments, the first bioluminescent material may comprise a bioluminescent plant, and the first light generating device may comprise a LED strip configured placed on and / or hanging from branches of the first bioluminescent plant. In other embodiments, the first light generating device may comprise a plurality of (small, e.g. micro) LEDs embedded into the first bioluminescent material. For instance, in embodiments, in case of a water-based first bioluminescent material the vessel (comprising the first bioluminescent material) may have a donut-like shape with the first light generating device placed in the middle. In such embodiments, first device light emitted from the first light generating device may travel through the vessel before exiting the light generating system. In other embodiments, in the case of a bioluminescent plant the first light generating device, e.g. a plurality of LEDs, may be distributed throughout the bioluminescent plant like Christmas lights.

[0033] Further, in specific embodiments, the first bioluminescent material may comprise a bioluminescent plant and / or a bioluminescent micro-organism configured to provide green first bioluminescent material light. In such embodiments, especially, the second source of second light may comprise a red inorganic LED configured to provide a narrow band spectrum, giving a high luminous efficacy of radiation, such that white system light may be provided. Alternatively, in such embodiments, instead of inorganic LEDs, also the combination of bioluminescent light and OLEDs may be used. For instance, transparent OLEDs may be integrated in the vessel. In yet other embodiments, the first bioluminescent material may comprise a bioluminescent plant configured in a vessel comprising soil, and the first light generating device may be powered by electrodes that may be present in the soil. Additionally or alternatively, in such embodiments, the first light generating device may be powered by electricity generated in leaves of the bioluminescent plant which are moved by external factors such as the wind. In this way, all spectral components of the white light will be powered by biological processes.

[0034] Yet, in other embodiments, (a) the first bioluminescent material may comprise one of a (partially) bioluminescent plant, a bioluminescent fungus, and a bioluminescent micro-organism, and (b)the second source of second light may comprise the first luminescent material. Especially, in such embodiments, the second source of second light may comprise the first luminescent material configured to convert at least part of the first bioluminescent material light received by the first luminescent material into first luminescent material light.

[0035] Such embodiments may be beneficial as luminescent materials are available for converting incident light into light having a wide range of colors. Hence, by adding such a luminescent material to the first bioluminescent material complementary colors of light may easily be provided to provide white light in a relatively cheap, and reliable fashion. For example, a luminescent material comprising a red-emitting phosphor may be added to a green- and blue-emitting bioluminescent material to provide white light. In another example, a luminescent material comprising a green-emitting and a red-emitting phosphor may be added to a blue-emitting bioluminescent material to provide white light. In yet another example, a luminescent material comprising a red-emitting phosphor may be added together with a blue-emitting solid state light source to a green-emitting bioluminescent material to provide white light. Further, luminescent materials may be easily implemented in a light generating system in different shapes, sized and configurations, providing versatility and facile mixing of light from the different light sources in the light generating system.

[0036] In embodiments, in the case of a water-based first bioluminescent material the first luminescent material may be integrated in the vessel or coated on the outside of the vessel. Integration of the luminescent material in the vessel may be easily realized by preferably using organic phosphor i.e. luminescent dyes such as e.g. red-emitting Lumogen F305. The luminescent dye may, in embodiments, be incorporated within any polymer which subsequently is used to form the vessel. In embodiments, in the case of a plant-based first bioluminescent material, the first luminescent material may be applied for instance by a (spray) coating applied on the luminescent parts of the plant.

[0037] Hence, the first luminescent material may, in embodiments, comprise an organic luminescent material. Especially, the first luminescent material may comprise an organic luminescent material selected from the group comprising Lumogen® Red F305, Lumogen® Orange F240, Lumogen® Yellow F083, and Lumogen® F170. Additionally or alternatively, in embodiments, the first luminescent material may comprise one or more inorganic luminescent materials (see also below). In embodiments, such inorganic luminescent material may e.g. comprise a luminescent material of the type AsBsO Ue, wherein A in embodiments comprises one or more of Y, La, Gd, Tb and Lu, and wherein B in embodiments comprises one or more of Al, Ga, In and Sc. Hence, in embodiments, incorporating regular inorganic luminescent material in a polymer is possible as well.

[0038] The term “luminescent material” may especially refer to a material that can convert first radiation, especially one or more of UV radiation and blue radiation, into second radiation. In general, the first radiation and second radiation have different spectral power distributions. Hence, instead of the term “luminescent material”, also the terms “luminescent converter” or “converter” may be applied. In general, the second radiation has a spectral power distribution at larger wavelengths than the first radiation, which is the case in so-called down-conversion. In specific embodiments, however the second radiation has a spectral power distribution with intensity at smaller wavelengths than the first radiation, which is the case in so-called up-conversion. In embodiments, the “luminescent material” may especially refer to a material that can convert radiation into e.g. visible and / or infrared light. For instance, in embodiments the luminescent material may be able to convert one or more of UV radiation and blue radiation, into visible light. The luminescent material may in specific embodiments also convert radiation into infrared radiation (IR). Hence, upon excitation with radiation, the luminescent material emits radiation. In general, the luminescent material will be a down converter, i.e. radiation with a smaller wavelength is converted into radiation with a larger wavelength (Xex<Xem), though in specific embodiments the luminescent material may comprise up-converter luminescent material, i.e. radiation with a larger wavelength is converted into radiation with a smaller wavelength (Xex>Xem). In embodiments, the term “luminescence” may refer to phosphorescence. In embodiments, the term “luminescence” may also refer to fluorescence. Instead of the term “luminescence”, also the term “luminescent material light” or “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. Likewise, the term “luminescent material” may in embodiments refer to phosphorescence and / or fluorescence. The term “luminescent material” may also refer to a plurality of different luminescent materials. Examples of possible luminescent materials are indicated below. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. Instead of the term “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art.

[0039] Further, in embodiments, the luminescent material may be comprised by a luminescent body. The luminescent body may be a layer, like a self-supporting layer. The luminescent body may also be a coating. The luminescent body may also comprise a luminescent coating on a support (especially a light transmissive support in the transmissive mode, or a reflective support in the reflective mode), such as a vessel. Especially, the luminescent body may essentially be self-supporting. In embodiments, the luminescent material may be provided as luminescent body, such as a luminescent single crystal, a luminescent glass, or a luminescent ceramic body. Such body may be indicated as “converter body” or “luminescent body”. In embodiments, the luminescent body may be a luminescent single crystal or a luminescent ceramic body. For instance, in embodiments a cerium comprising garnet luminescent material may be provided as a luminescent single crystal or as a luminescent ceramic body. In other embodiments, the luminescent body may comprise a light transmissive body, wherein the luminescent material is embedded. For instance, the luminescent body may comprise a glass body, with luminescent material embedded therein. Or the glass as such may be luminescent. In other embodiments, the luminescent body may comprise a polymeric body, with luminescent material embedded therein. Especially, the luminescent body may be configured in the transmissive mode. In the transmissive mode, it may be relatively easy to have light source light admixed in the luminescent material light, which may be useful for generating the desirable spectral power distribution. In the reflective mode, thermal management may be easier, as a substantial part of the luminescent material may be in thermal contact with a thermally conductive element, like a heatsink or heat spreader. Hence, would any device light escape from the system, in embodiments this may only occur via transmission through the luminescent body.

[0040] Further, in embodiments, the luminescent body may comprise a plurality of luminescent materials. For example, the luminescent body may comprise a first luminescent material configured to generate (upon irradiation) green-yellow light, and a second luminescent material configured to generate red light. Optionally, in embodiments, the luminescent body may comprise an (additional) luminescent material configured to generate blue-green light.

[0041] In embodiments, luminescent materials are selected from garnets and nitrides, especially doped with trivalent cerium or divalent europium, respectively. The term “nitride” may also refer to oxynitride or nitridosilicate, etc. Alternatively or additionally, the luminescent material(s) may be selected from silicates, especially doped with divalent europium.

[0042] In specific embodiments, the luminescent material may at least comprise a luminescent material of the type AsBsOnT'e. 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; and wherein the device light may comprise blue device light. Especially, A may comprise one or more of Y, Gd and Lu, such as especially one or more of Y and Lu. Especially, B may comprise one or more of Al and Ga, more especially at least Al, such as essentially entirely Al. Hence, especially suitable luminescent materials are cerium comprising garnet materials. Embodiments of garnets especially include A3B5O12 garnets, wherein A comprises at least yttrium (Y) or lutetium (Lu) and wherein B comprises at least aluminum (Al). Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of cerium and praseodymium; especially however with Ce. Especially, B may comprise aluminum (Al); however, in addition to aluminum, B may also partly comprise gallium (Ga) and / or scandium (Sc) and / or indium (In), especially up to about 20% of B, more especially up to about 10 % of B (i.e. the B ions essentially consist of 90 or more mole % of Al and 10 or less mole % of one or more of Ga, Sc and In); B may especially comprise up to about 10% gallium. In another variant, B and O may at least partly be replaced by Si and N. The element A may especially be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb) and lutetium (Lu). Further, Gd and / or Tb are especially only present up to an amount of about 20% of A. In a specific embodiment, the garnet luminescent material comprises (Y i- xLux)3BsOi2:Ce, wherein x is equal to or larger than 0 and equal to or smaller than 1. The term “:Ce”, indicates that part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce. For instance, in the case of (Y i-xLux)3AlsOi2:Ce, part of Y and / or Lu is replaced by Ce. This is known to the person skilled in the art. Ce will replace A in general for not more than 10%; in general, the Ce concentration will be in the range of 0.1 to 4%, especially 0.1 to 2% (relative to A). Assuming 1% Ce and 10% Y, the full correct formula could be (Y o.iLuo.89Ceo.oi)3A150i2. Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art.

[0043] Alternatively or additionally, the luminescent material may comprise a luminescent material of the type AsSieNi i:Ce3. wherein A comprises one or more of Y, La, Gd, Tb and Lu, such as in embodiments one or more of La and Y.

[0044] In embodiments, the luminescent material may alternatively or additionally comprise one or more of MS:Eu2+and / or I LSisb- Eu2and / or MalSiN3:Eu2+and / or Ca2AlSi3O2Ns:Eu2+, etc., wherein M comprises one or more of Ba, Sr and Ca, especially in embodiments at least Sr. Hence, in embodiments, the luminescent material may comprise one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu and (Ba,Sr,Ca)2SisN8:Eu. In these compounds, europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations. In general, Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces. The term “:Eu”, indicates that part of the metal ions is replaced by Eu (in these examples by Eu2+). For instance, assuming 2% Eu in CaAlSiN3:Eu, the correct formula could be (Cao.98Euo.o2)AlSiN3. Divalent europium will in general replace divalent cations, such as the above divalent alkaline earth cations, especially Ca, Sr or Ba. The material (Ba,Sr,Ca)S:Eu can also be indicated as MS:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium. Here, Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca). Further, the material (Ba,Sr,Ca)2SisN8:Eu can also be indicated as M2SisN8:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound Sr and / or Ba. In a further specific embodiment, M consists of Sr and / or Ba (not taking into account the presence of Eu), especially 50 to 100%, more especially 50 to 90% Ba and 50 to 0%, especially 50 to 10% Sr, such as Bai.sSro.sSis Eu (i.e. 75 % Ba; 25% Sr). Here, Eu is introduced and replaces at least part of M, i.e. one or more of Ba, Sr, and Ca). Likewise, the material (Ba,Sr,Ca)AlSiN3:Eu can also be indicated as mAlSiN3:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium. Here, Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca). Eu in the above indicated luminescent materials is substantially or only in the divalent state, as is known to the person skilled in the art. The term “luminescent material” herein especially relates to inorganic luminescent materials. Alternatively or additionally, also other luminescent materials may be applied. For instance quantum dots and / or organic dyes may be applied and may optionally be embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc.

[0045] Especially, the luminescent material may be configured to convert light, especially first bioluminescent material light received by the luminescent material into luminescent material light. Hence, the luminescent material may be configured in the system such that, together with one or more optical elements, first bioluminescent material light may reach the luminescent material. More especially, at least part of the first bioluminescent material light may reach the luminescent material, such as at least 50% of the first bioluminescent material light, like at least 60% of the first bioluminescent material light, especially at least 70% of the first bioluminescent material light. In embodiments, the first luminescent material may be configured to convert first bioluminescent material light received by the first luminescent material into first luminescent material light. Especially, in embodiments only part of the bioluminescent material light may be converted, such as at maximum 70% (on a power basis), and especially at least about 10%, such that the system light may comprise both the first bioluminescent material light and the first luminescent material light.

[0046] In embodiments, the second source of second light may thus comprise the luminescent material. For example, in embodiments, the light generating system may comprise a blue (and / or green) light providing first bioluminescent material (e.g. a waterbased bioluminescent material, such as a bioluminescent micro-organism) and a first luminescent material configured to convert part of the blue (and / or green) first bioluminescent material light into first luminescent material light having a spectral power distribution in a complimentary color wavelength range, such as e.g. the red wavelength range.

[0047] In yet other embodiments, (a) the first bioluminescent material may comprise one of a (partially) bioluminescent plant, a bioluminescent fungus, and a bioluminescent micro-organism, and (b) the second source of second light may comprise the second bioluminescent material, wherein in embodiments, the second source of second light may comprise the second bioluminescent material comprising another one of a (partially) bioluminescent plant, a bioluminescent fungus, and a bioluminescent micro-organism.

[0048] Such embodiments may be beneficial as bioluminescent light sources may have synergy, making it relatively easy to combine them and provide them with the appropriate conditions. Additionally, bioluminescent light sources may require little to no energy, and may be composted at the end of their lifetime, making them a cost and environmentally friendly option for providing white system light in street lighting or decorative lighting applications.

[0049] As described above, in embodiments, the second bioluminescent material may comprise any type of bioluminescent material. Especially, in embodiments, the second bioluminescent material may comprise one or more of a bioluminescent plant, a bioluminescent fungus, a bioluminescent micro-organism, bioluminescent algae, and cultured bioluminescent material. In embodiments, the first bioluminescent material and the second bioluminescent material may comprise essentially the same (type ol) bioluminescent material (but wherein the first bioluminescent material light and the second bioluminescent material light have a different spectral power distribution). For example, in embodiments, the first bioluminescent material may comprise a bioluminescent micro-organism, and the second bioluminescent material may also comprise a (different) micro-organism. However, in other embodiments, the first bioluminescent material and the second bioluminescent material may comprise different bioluminescent materials. For example, in embodiments, the first bioluminescent material may comprise a plant-based bioluminescent material and the second bioluminescent material may comprise a water-based bioluminescent material (e.g. a bioluminescent micro-organism).

[0050] Herein a bioluminescent plant may, in embodiments, be partially bioluminescent. In other words, the bioluminescent plant may comprise parts configured to provide bioluminescent material light. For example, in embodiments, the bioluminescent plant may comprise bioluminescent leaves, but non-bioluminescent stems. In another example, in embodiments, the bioluminescent plant may comprise bioluminescent flowers, but non-bioluminescent leaves and / or stems. However, in embodiments, the bioluminescent plant may (also) be essentially fully bioluminescent. The bioluminescent plant may, in embodiments, be a genetically engineered bioluminescent plant. Especially, genes from a bioluminescent source, such as e.g. a bioluminescent fungus, may be inserted into the DNA of plants. In embodiments, such inserted genes may relate to enzymes that convert caffeic acid, through a series of steps, into a luciferin that emits energy as light, before turning the resulting substance back into caffeic acid. The green luminescence produced by the caffeic acid cycle fits well with the optical transparency window of pigmented plant tissues. Further, it has been shown that expression of caffeic acid cycle is not toxic in plants and does not impose an obvious burden on plant growth, at least in the greenhouse. The genetically engineered (or modified) plants may, in embodiments, glow with a greenish hue, which may be visible to the naked eye. The plants may glow both in the dark and in the daylight.

[0051] Further, in specific embodiments, the bioluminescent plant may comprise one or more of the group comprising: a flower, a shrub, a moss, a tree, a grass, a fiber crop, an algae, a hydroponic bioluminescent plant, and a climber. Further, in embodiments, the bioluminescent plant may comprise one or more of a potted plant, cut flowers (e.g. placed in a vase for indoor use), a plant, flower, shrub, tree, grass configured, and a consumable (such as a food or a drug). The plant, flower, shrub, tree, or grass, may in embodiments be configured in outdoor soil (e.g. for outdoor landscaping / gardening), but may also be configured indoors. Herein the term “hydroponic bioluminescent plant”, and similar terms, may refer to a plant which may be grown using a water-base nutrient solution rather than a soil-based nutrient solution. Hence, hydroponic plants may have their roots submerged in water rather than soil.

[0052] In embodiments, the bioluminescent plant may comprise a flower. Flowers (i.e. genetically engineered flowers) may provide relatively high intensity bioluminescence. Therefore, for example, in embodiments, the bioluminescent plant may comprise one or more flowers of the group comprising: a petunia, a sunflower. Bioluminescent flowers may especially provide the benefit of tunability, as flowers have natural responses to stimuli such as light, which may be exploited in the light generating system. Such responses may for example include turning of a direction the flower is facing, and opening and closing of the flower.

[0053] Further, in embodiments, the bioluminescent plant may comprise one or more plant of the group comprising: Spanish moss, white poplar, swamp white oak, ivy, lichen, tall grass (e.g. switch grass), Tillandsia, tobacco, Cannabis, mustard plant, and Brugmansia. However, others may also be possible.

[0054] In embodiments, the bioluminescent plant may especially comprise bioluminescent algae, such as e.g. one or more of dinoflagellates and coccolithophores.

[0055] Further, in embodiments, the bioluminescent material may comprise a bioluminescent fungus. Especially, in embodiments, the bioluminescent fungus may comprise one or more fungi of a genus of the group comprising: an Armillaria. Mycena. a Panellus. a Neonol hopanus, an Omphalotus. a Roridomyces , and aFavolaschia.

[0056] Further, in embodiments, the bioluminescent material may comprise a bioluminescent micro-organism. Especially, in embodiments, the bioluminescent microorganism may comprise one or more micro-organisms selected from a genus from the group comprising: Photorhabdus, Shewanella, Aliivibrio, Photobacterium, Vibrio, and Candidatus Photodesmus .

[0057] The light generating system may, in embodiments, also comprise a third source of third light. Especially, in embodiments, the third source of third light may have a third spectral power distribution different from the first spectral power distribution and the second spectral power distribution. In embodiments, the third source may comprise a (solid state light source comprising) third light generating device configured to generate third device light. Additionally or alternatively, in embodiments, the third source may comprise a third luminescent material configured to convert at least part of the first bioluminescent material light into third luminescent material light. Additionally or alternatively, in embodiments, the third source may comprise a third bioluminescent material configured to generate third bioluminescent material light. Therefore, in embodiments, the third light may comprise one or more of the third device light, the third luminescent material light, and the third bioluminescent material light. Furthermore, in embodiments, the light generating system may be configured to generate system light comprising in an operational mode of the light generating system the first light, the second light, and the third light. Hence, in embodiments, the light generating system may comprise a third source of third light configured to generate third light having a third spectral power distribution different from the first spectral power distribution and the second spectral power distribution; wherein the third source may comprise one or more of (a) a third light generating device, configured to generate third device light, (b) a third luminescent material configured to convert at least part of the first bioluminescent material light received by the third luminescent material into third luminescent material light; and (c) a third bioluminescent material configured to generate third bioluminescent material light; wherein the third light may comprise one or more of the third device light, the third luminescent material light, and the third bioluminescent material light; and wherein the light generating system may be configured to generate system light comprising in an operational mode of the light generating system the first light, the second light, and the third light. The options mentioned here are further discussed below.

[0058] Such embodiments may be beneficial as using three different sources of light may facilitate the generation of white light from red-green-blue (RGB) mixed light.

[0059] The third source of third light may, in embodiments, especially be configured to generate third light having a third spectral power distribution. Especially, in embodiments, the third source of third light may have a third spectral power distribution in the visible wavelength range. For example, in embodiments, the third light may comprise one of blue light, green light, yellow light, orange light, and red light. Further, in some embodiments, the third light may (also) have a third spectral power distribution in one or more of the IR and the UV wavelength ranges. Especially, in embodiments, the third spectral power distribution may be different from one or more of the first spectral power distribution the second spectral power distribution, however, this may not necessarily be the case. For example, in embodiments, the first source of first light and the third source of third light may generate light e.g. having complementary colors (e.g. red and cyan, green and magenta, or blue and yellow). In embodiments, the third light may especially be comprised by the system light.

[0060] In embodiments, the third source may comprise a third light generating device configured to generate third device light. Especially, in such embodiments, the third source may comprise a solid state light source comprising third light generating device. Additionally or alternatively, in embodiments, the third source may comprise a third luminescent material. The third luminescent material may especially be configured to convert at least part of the first bioluminescent material light received by the third luminescent material into third luminescent material light. In embodiments, the third luminescent material may comprise essentially any type of luminescent material. Different possible types of luminescent materials are described in more detail above. Additionally or alternatively, in embodiments, the third source may comprise a third bioluminescent material configured to provide third bioluminescent material light. In embodiments, the third bioluminescent material may comprise any type of bioluminescent material. Especially, in embodiments, the third bioluminescent material may comprise one or more of a bioluminescent plant, a bioluminescent fungus, a bioluminescent micro-organism, bioluminescent algae, and cultured bioluminescent material. The third source of third light may thus, in embodiments, comprise one or more of the (solid state light source comprising) third light generating device, the third luminescent material, and the third bioluminescent material. Hence, in embodiments, the third light may comprise one or more of the third device light, the third luminescent material light, and the third bioluminescent material light.

[0061] As briefly indicated above, in embodiments, the bioluminescent material may comprise essentially any bioluminescent material. Especially, in embodiments, one or more of the first bioluminescent material and the second bioluminescent material may comprise a (partially) bioluminescent plant. In embodiments, the (partially) bioluminescent plant may comprise a plant comprising a bioluminescent stem. Additionally or alternatively, in embodiments, the (partially) bioluminescent plant may comprise a plant comprising bioluminescent flowers. Additionally or alternatively, in embodiments, the (partially) bioluminescent plant may comprise a plant comprising bioluminescent leaves. Hence, in embodiments, one or more of the first bioluminescent material and the second bioluminescent material may comprises a bioluminescent plant, wherein the bioluminescent plant may comprise one of: a plant comprising a bioluminescent stem, a plant comprising bioluminescent flowers, and a plant comprising bioluminescent leaves. Here below, the different options mentioned here are discussed in further detailed embodiments.

[0062] In embodiments, one or more of the first bioluminescent material and the second bioluminescent material (and optionally the third bioluminescent material) may comprise a partially bioluminescent plant. Especially, the partially bioluminescent plant may comprise bioluminescent flowers and / or leaves (but a non-bioluminescent stem and / or branches). In other embodiments, the partially bioluminescent plant may comprise a bioluminescent stem and / or branches (but non-bioluminescent flowers and / or leaves). In such embodiments, the flowers and / or leaves of the partially bioluminescent plant may block, or even reflect the bioluminescent light. Hence, in such embodiments, a direction of the bioluminescent light (and possibly even the system light) may be controlled. For example, in specific embodiments, the first bioluminescent material (and / or the second bioluminescent material and / or the third bioluminescent material) may comprise a tree comprising a bioluminescent tree trunk and a (non-)bioluminescent tree crown. Especially, in such embodiments, at least part of the (non-)bioluminescent tree crown may be configured to block and / or reflect the first bioluminescent material light. Hence, in specific embodiments, the first bioluminescent material may comprise a tree comprising a bioluminescent tree trunk and a (non-)bioluminescent tree crown, wherein at least part of the (non-)bioluminescent tree crown may be configured to block and / or reflect the first bioluminescent material light. Such embodiments may be beneficial as it may help to direct the bioluminescent material light to a target surface and / or object to be illuminated. Hence, such embodiments may avoid light being emitted in unwanted directions. For instance, in such embodiments uplighting in outdoor applications may be blocked, which may help avoid light pollution of the night sky.

[0063] Further, in embodiments, the first bioluminescent material (and / or the second bioluminescent material and / or the third bioluminescent material) may be configured on a (substantially) vertical surface. For example, in embodiments, the bioluminescent material may be configured on a wall, a raster, a streetlamp, branches of a tree, or a tree trunk. The bioluminescent material may, in such embodiments, e.g. comprise one or more of a lichen, a moss, an algae, a fungus, or an ivy or another climbing plant.

[0064] Further, in embodiments, the light generating system may additionally comprise a light-reflective element configured to direct system light incident on the light- reflective element to a target area. Hence, in embodiments, the first bioluminescent material may be configured on a vertical surface , wherein the light generating system may optionally comprise a light-reflective element configured to direct system light incident on the light- reflective element to a target area. Examples and further details of embodiments indicated here are discussed further below.

[0065] Such embodiments may be beneficial as bioluminescent materials that may grow (or live) especially well on vertical surfaces such as trees may comprise bioluminescent algae, moss, lichen, and ivy, which tend to grow on the shadow sides of said vertical surface. Therefore, the bioluminescent material light may especially be provided at places that are barely illuminated by or even blocked from sunlight, i.e., there will be no uplighting.

[0066] For example, in embodiments, the light-reflective element may comprise the crown of a tree. Especially, in embodiments, the tree may comprise white flowers and / or leaves (such as e.g. a white poplar or a swamp white oak). In other embodiments, the tree may comprise a layer or coating of reflective material provided on the leaves and / or branches of its crown. Further, in embodiments, the light-reflective element may comprise an element (configured to reflect the system light and) configured perpendicular to a tree and / or a wall. Especially, in embodiments, the light-reflective element, e.g. a reflector, may comprise a metallic material. For example, in embodiments, the light-reflective element may comprise a metallic layer or coating. In other embodiments, the light-reflective element may essentially consist of a metallic material. In yet other embodiments, the light-reflective element may comprise one of a white reflective top cover and white slanted lamellae. In yet other embodiments, the bioluminescent material may comprise a bioluminescent plant hanging from a reflective ceiling (or e.g. a reflective wall).

[0067] Yet further, in embodiments, the first bioluminescent material may comprise a bioluminescent flower. Especially, in embodiments, the first bioluminescent material may comprise a light-responsive bioluminescent flower. For example, in embodiments, the light- responsive bioluminescent flower may comprise a bioluminescent sunflower. In embodiments, during a first period of time an optical signal may be provided to the bioluminescent flower, such that the bioluminescent flower may move from a first orientation to a second orientation (different from the first orientation). Conversely, in embodiments, during a second period of time the bioluminescent flower may be allowed to move from the second orientation back to the first orientation. Hence, in embodiments, the first bioluminescent material may comprise a light-responsive bioluminescent flower, wherein during a first period of time an optical signal may be provided to the bioluminescent flower, such that the bioluminescent flower may move from a first orientation to a second orientation different from the first orientation, wherein during a second period of time the bioluminescent flower may be allowed to move from the second orientation back to the first orientation.

[0068] Especially, a plant may be engineered such that (only) the flowers give bioluminescence and wherein the plant is chosen having flowers that are naturally pointing downwards and / or are naturally shielded by leaves above them. Such embodiments may be beneficial as bioluminescent material light may especially be provided at places that are barely illuminated by or even blocked from sunlight, i.e., there will be no uplighting. Furthermore, such embodiment may provide the benefit of providing bioluminescent material light during the first period of time (e.g. the day) to a target area, e.g., a bed or a street or a path. Then during the second period of time (e.g. the night) maximized bioluminescent effect may be observed by the user, and the flower may slowly turn back to its original orientation to begin the cycle again. Hence, in such embodiments, the light generating system may provide a sort-of sundial (or “sunflowerdial”).

[0069] In embodiments, the first bioluminescent material may thus comprise a light- responsive bioluminescent material. Especially, in embodiments, the light-responsive bioluminescent material may comprise a light-responsive bioluminescent flower, such as a bioluminescent sunflower. However, in embodiments, other light-responsive bioluminescent materials may be possible as well. The light-responsive bioluminescent flower may especially be responsive to an optical signal. In embodiments, the optical signal may comprise a synthetic light signal, such as from a solid-state light source (e.g. from one or more of the first source, the second source, and the third source of light). Additionally or alternatively, in embodiments, the optical signal may comprise a signal from a natural source, such as e.g. the sun. In embodiments, during a first period of time the optical signal may be provided to the bioluminescent flower. The bioluminescent flower may in response to the signal move from a first orientation (its original orientation) to a second orientation. The second orientation may especially be different from the first orientation. In embodiments, the movement of the bioluminescent flower may comprise one or more of turning, opening (especially opening its petals to reveal its core) and closing (especially closing its petals over its core, i.e., covering its core). For example, in embodiments, the bioluminescent flower (e.g. a bioluminescent sunflower) may, during the day, turn from facing the east to facing the west by following the (signal from the) sun. During a second period of time, in embodiments, the bioluminescent flower may be allowed to move from the second orientation back to the first orientation. For example, in embodiments, the bioluminescent flower (e.g. a bioluminescent sunflower) may, during the night, turn from facing the west back to facing the east, such that a new cycle of following the (signal from the) sun may ensue. Hence, in embodiments, the bioluminescent flower may move its relative position in response to signals correlated to a circadian rhythm. In other embodiments, the bioluminescent flower may move its relative position in response to synthetic signals (e.g. configured to provide a specific light pattern over time).

[0070] The light generating system may further, in embodiments, comprise a bioluminescent material control system. Especially, in embodiments, the bioluminescent material control system may be configured to control a condition of the first bioluminescent material. Hence, in embodiments, the light generating system may comprise a bioluminescent material control system configured to control a condition of the first bioluminescent material.

[0071] Herein, the phrase “a condition of the first bioluminescent material” may especially refer to a physical condition (e.g. an environmental condition, such as water level) of the first bioluminescent material and / or a performance condition (e.g. light intensity) of the first bioluminescent material. For example, in embodiments, the bioluminescent material control system may be configured to control one or more of a water level relative to the first bioluminescent material, a soil composition relative to the first bioluminescent material, a pH relative to the first bioluminescent material, light exposure of the first bioluminescent material, oxygen concentration relative to the first bioluminescent material, etc. etc.. The bioluminescent material control system may further, in embodiments, also be configured to control a condition of one or more of the second bioluminescent material and the third bioluminescent material.

[0072] The light generating system may further, in embodiments, comprise a sensor. Especially, in embodiments, the sensor may be configured to sense one or more of intensity (e.g. radiant flux), spectral power distribution, and direction of the first bioluminescent material light (and optionally the second bioluminescent material and / or the third bioluminescent material). Additionally or alternatively, in embodiments, the sensor may be configured to provide a signal to the bioluminescent material control system. In embodiments, the bioluminescent material control system may be configured to adapt one or more of intensity, spectral power distribution, and direction of the second source of second light (especially the first light generating device) in dependence of the signal. As such, in embodiments, the light generating system may be configured to adapt in dependence of the performance of the bioluminescent material. Such embodiments may be beneficial as the second source of second light may be adapted to make up for degradation and / or variation in the performance of the bioluminescent material, and thus to maintain the overall white system light output.

[0073] In embodiments, the bioluminescence-based light generating system as described herein may especially be applied as a bio marker to monitor a plant’s response to the administered light stimulation and based thereupon the plant’s health status may be inferred. Especially, in embodiments, plants with inserted bioluminescent genes may be utilized in e.g. horticulture applications as a way of monitoring from a distance with a (standard) camera the inner workings of plants. Therefore, in embodiments, first artificial lighting, e.g. the first light generating device of the second source, may be actuated to stimulate the plant. Subsequently, in embodiments, the artificial light may be switched off and the bioluminescent biomarker may be observed to “see” with the help of the camera the response of the plant to the administered light stimulation. In embodiments, machine learning may be applied to deduce from the bioluminescent reaction the plant' s health status.

[0074] Previous embodiments described several ways of directing the system light to a target area. In other embodiments, such direction may be achieved through reflecting and / or scattering elements in the light generating system. Hence, in embodiments, the light generating system may comprise reflecting or scattering elements. Especially, in embodiments, the reflecting or scattering elements may be configured to mix first light and second light (and optionally third light) into white system light. Additionally or alternatively, in embodiments, the reflecting or scattering elements may be configured to direct the system light to the target area. Hence, in embodiments, the light generating system may comprise reflecting or scattering elements, wherein the reflecting or scattering elements may be configured to one or more of (i) mix first light and second light into white system light, and (ii) direct the system light to a target area.

[0075] Such embodiments may especially be beneficial when the first source of first light and the second source of second light are spatially separated. In such embodiments, the reflecting or scattering elements may provide the white system light by aiming the second light on the first source, especially the bioluminescent plant or the water vessel containing bioluminescent organisms. Furthermore, the plant, vessel and / or water may contain white reflecting or scattering elements to use second light more efficiently for achieving a white light effect for the user. For example, in embodiments, the reflecting or scattering elements may comprise light-reflecting and / or scattering particles configured in the vessel, such as embedded in the vessel. In other embodiments, reflecting or scattering elements may comprise light-reflecting and / or scattering particles configured on or embedded in one or more of the (bio)luminescent materials.

[0076] The term “white light”, and similar terms, herein, are known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1800 K and 20000 K, such as between 2000 and 20000 K, especially 2700- 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700 K and 6500 K, for example in the range of 2700 K and 4500 K. In embodiments, e.g. for backlighting purposes, or for other purposes, the correlated color temperature (CCT) may especially be in the range of about 7000 K and 20000 K. Yet further, in embodiments the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL. Hence, the light generating system may especially, in embodiments, be configured to provide, in an operational mode of the light generating system, system light having a correlated color temperature selected from the range of 1800-6500 K. In embodiments, the white light has a color rendering index of at least 70, preferably at least 80, more preferably at least 85, most preferably at least 90.

[0077] The light generating system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting. The light generating system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems.

[0078] The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein “controlling” and similar terms may e.g. refer to imposing behavior to the element (determining the behavior or supervising the running of an element), etc., such as e.g. measuring, displaying, actuating, opening, shifting, changing temperature, etc.. Beyond that, the term “controlling” and similar terms may additionally include monitoring. Hence, the term “controlling” and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element. The controlling of the element can be done with a control system, which may also be indicated as “controller”. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and / or wireless control. The term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems. A control system may comprise or may be functionally coupled to a user interface.

[0079] The control system may also be configured to receive and execute instructions from a remote control. In embodiments, the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I-phone, a tablet, etc.. The device is thus not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system. Hence, in embodiments the control system may (also) be configured to be controlled by an App on a remote device. In such embodiments the control system of the lighting system may be a slave control system or control in a slave mode. For instance, the lighting system may be identifiable with a code, especially a unique code for the respective lighting system. The control system of the lighting system may be configured to be controlled by an external control system which has access to the lighting system on the basis of knowledge (input by a user interface of with an optical sensor (e.g. QR code reader) of the (unique) code. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology.

[0080] The system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation” or “operational mode”. The term “operational mode may also be indicated as “controlling mode”. Likewise, in a method an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation” or “operational mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and / or after executing the mode one or more other modes may be executed.

[0081] However, in embodiments a control system may be available, that is adapted to provide at least the controlling mode. Would other modes be available, the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible. The operation mode may in embodiments also refer to a system, or apparatus, or device, which can only operate in a single operation mode (i.e. “on”, without further tunability).

[0082] Hence, in embodiments, the control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme.

[0083] In yet a further aspect, the invention also provides a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc. etc... The lamp or luminaire may further comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. In yet a further aspect, the invention also provides one or more of a portable lighting device, a solar powered lighting device, a “Hue Go” light, or a torchlight, comprising the light generating system as defined herein. Hence, in an aspect the invention also provides a lighting device selected from the group of a lamp, a luminaire, a portable lighting device, a solar powered lighting device, and an optical wireless communication device, comprising the light generating system as defined herein. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the light generating system. For instance, in embodiments the lighting device may comprise a housing or a carrier, configured to house or support one or more of the first source of first light, the second source of second light, and the third source of third light. In embodiments, the lamp or luminaire may comprise a portable lighting device or a solar powered lighting device.

[0084] The terms “visible”, “visible light” or “visible emission” and similar terms refer to light having one or more wavelengths in the range of about 380-780 nm. Herein, UV may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm. The terms “light” and “radiation” are herein interchangeably used, unless clear from the context that the term “light” only refers to visible light. The terms “light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light. The terms “violet light” or “violet emission” especially relates to light having a wavelength in the range of about 380-440 nm. The terms “blue light” or “blue emission” especially relates to light having a wavelength in the range of about 440-495 nm (including some violet and cyan hues). The terms “green light” or “green emission” especially relate to light having a wavelength in the range of about 495-570 nm. The terms “yellow light” or “yellow emission” especially relate to light having a wavelength in the range of about 570- 590 nm. The terms “orange light” or “orange emission” especially relate to light having a wavelength in the range of about 590-620 nm. The terms “red light” or “red emission” especially relate to light having a wavelength in the range of about 620-780 nm. The term “pink light” or “pink emission” refers to light having a blue and a red component. The term “cyan” may refer to one or more wavelengths selected from the range of about 490-520 nm. The term “amber” may refer to one or more wavelengths selected from the range of about 585-605 nm, such as about 590-600 nm. The phrase “light having one or more wavelengths in a wavelength range” and similar phrases may especially indicate that the indicated light (or radiation) has a spectral power distribution with at least intensity or intensities at these one or more wavelengths in the indicate wavelength range. For instance, a blue emitting solid state light source will have a spectral power distribution with intensities at one or more wavelengths in the 440-495 nm wavelength range.

[0085] BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which: Figs. 1-2 schematically depict some embodiments of the light generating system.

[0087] Fig. 3 schematically depicts some applications of the light generating system. The schematic drawings are not necessarily to scale.

[0088] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0089] Fig. 1 schematically depicts a light generating system 1000 configured to provide system light 1001. In embodiments, the light generating system 1000 especially comprises a first source 10 of first light 11 and a second source 20 of second light 21. The first source 10 of first light 11 may, in embodiments, comprise a first bioluminescent material 410 configured to generate first bioluminescent material light 411. Especially, in embodiments, the first bioluminescent material light 411 may have a first spectral power distribution. The second source 20 of second light 21 may, in embodiments, be configured to generate second light 21. Especially, in embodiments, the second light 21 may have a second spectral power distribution different from the first spectral power distribution. Further, in embodiments, the second source 20 may comprise one or more of (a) a (solid state light source comprising) first light generating device 100 configured to generate first device light 111, (b) a first luminescent material 210 configured to convert at least part of the first bioluminescent material light 411 received by the first luminescent material 210 into first luminescent material light 211; and (c) a second bioluminescent material 420 configured to generate second bioluminescent material light 421. Hence, in embodiments, the second light 21 may comprise one or more of the first device light 111, the first luminescent material light 211, and the second bioluminescent material light 421. In embodiments, the light generating system 1000 may thus be configured to generate system light 1001 comprising in an operational mode of the light generating system 1000 the first light 11 and the second light 21. Especially, in embodiments, the system light 1001 may comprise white light.

[0090] Further, in embodiments, the first bioluminescent material 410 may comprise one or a (partially) bioluminescent plant 450, a bioluminescent fungus, and a bioluminescent micro-organism 470.

[0091] Reference 340 herein refers to a bioluminescent material control system. Hence, in embodiments, the light generating system 1000 further comprises a bioluminescent material control system 340 configured to control a condition of the first bioluminescent material 410. In embodiments, the bioluminescent material control system 340 may comprise a sensor 350. The sensor 350 may be configured (i) to sense one or more of intensity, spectral power distribution, and direction of the first bioluminescent material light 411, and (ii) to provide a signal to the bioluminescent material control system 340. In embodiments, the control system 340 may be configured to adapt one or more of intensity, spectral power distribution, and direction of the second source 20 of second light 21 in dependence of the signal.

[0092] Further, in embodiments, the light generating system 1000 may comprises a third source 30 of third light 31 configured to generate third light 31. The third light 31 may especially have a third spectral power distribution different from the first spectral power distribution and the second spectral power distribution. In embodiments, the third source 30 may comprise one or more of (a) a (solid state light source comprising) third light generating device 130, configured to generate third device light 131, (b) a third luminescent material 230 configured to convert at least part of the first bioluminescent material light 411 received by the third luminescent material 230 into third luminescent material light 231; and (c) a third bioluminescent material 430 configured to generate third bioluminescent material light 431. Therefore, in embodiments, the third light 31 may comprise one or more of the third device light 131, the third luminescent material light 231, and the third bioluminescent material light 431. In embodiments, the light generating system 1000 may be configured to generate system light 1001 comprising in an operational mode of the light generating system 1000 the first light 11, the second light 21, and the third light 31.

[0093] Reference 700 may herein refer to a vessel. Especially, in embodiments, the vessel 700 may be configured to hold (or contain) at least the first source 10 of first light 11 (especially the first bioluminescent material 410).

[0094] Embodiments of the light generating system are depicted in the subfigures of figure 1 and may be illustrated in further detail below.

[0095] Especially, Fig. 1 subfigure I schematically depicts the light generating system 1000 wherein the first bioluminescent material 410 comprises the (partially) bioluminescent plant 450. Further, the light generating system 1000 depicted here may comprise the second source 20 of second light 21 comprising the (solid state light source comprising) first light generating device 110. Yet further, as depicted here, the light generating system 1000 may comprise the third source 30 of third light 31 comprising the (solid state light source comprising) third light generating device 130. In embodiments, the first light generating device 110 and the third light generating device 130 may comprise essentially the same light generating device. However, in other embodiments, the first light generating device 110 and the third light generating device 130 may comprise a different light generating device. Here, the first source 10, the second source 20, and the third source 30 may be depicted spatially separated. However, in embodiments, the first source 10, the second source 20, and the third source 30 may also be configured together. For example, the first light generating device 110 and / or third light generating device 130 may be configured embedded in the first bioluminescent material 410. In embodiments, the light generating system 1000 may comprise additional optics configured to one or more of: combine, homogenize, diffuse, scatter, and distribute the first light 11, the second light 21 and / or the third light 31.

[0096] Fig. 1 subfigure II schematically depicts the light generating system 1000 wherein the first bioluminescent material 410 comprises the bioluminescent micro-organism 470. Further, the light generating system 1000 depicted here may comprise the second source 20 of second light 21 comprising the (solid state light source comprising) first light generating device 110. Yet further, as depicted here, the light generating system 1000 may comprise the third source 30 of third light 31 comprising the (solid state light source comprising) third light generating device 130. Here, the first source 10, the second source 20, and the third source 30 may be depicted spatially separated. However, in embodiments, the first source 10, the second source 20, and the third source 30 may also be configured together. For example the first light generating device 110 and / or third light generating device 130 may be configured physically attached to the vessel 700.

[0097] In embodiments, the light generating system 1000 may comprise reflecting or scattering elements 550. Especially, in embodiments, the reflecting or scattering elements 550 may be configured to one or more of (i) mix first light 11 and second light 21 (and optionally third light 31) into white system light 1001, and (ii) direct the system light 1001 to a target area 500 (see also Fig. 2).

[0098] Fig. 1 subfigure III schematically depicts the light generating system 1000 wherein the first bioluminescent material 410 comprises the bioluminescent micro-organism 470. Further, the light generating system 1000 depicted here may comprise the second source 20 of second light 21 comprising the first luminescent material 210. Yet further, the light generating system 1000 depicted here may comprise the third source 30 of third light 31 comprising the third luminescent material 230. In embodiments, the first luminescent material 210 and the third luminescent material 230 may comprise essentially the same luminescent material. However, in other embodiments, the first luminescent material 210 and the third luminescent material 230 may comprise a different luminescent material. Hence, in embodiments, the light generating system 1000 may comprise a luminescent body 200 comprising the first luminescent material 210 and the third luminescent material 230. Especially, as depicted here, the bioluminescent micro-organism 470 may be contained in a vessel 700. The vessel may, in embodiments, comprise the first luminescent material 210 and / or the third luminescent material 230. For example, in embodiments, the first luminescent material 210 and / or the third luminescent material 230 may be configured on the vessel 700 as a layer or coating. In other embodiments, the vessel may essentially consist of the first luminescent material 210 and / or the third luminescent material 230.

[0099] Fig. 1 subfigure IV schematically depicts the light generating system 1000 wherein the first bioluminescent material 410 comprises the (partially) bioluminescent plant 450. Further, the light generating system 1000 depicted here may comprise the second source 20 of second light 21 comprising the second bioluminescent material 420. Especially, the second bioluminescent material 420 may comprise the bioluminescent micro-organism 470. Yet further, the light generating system 1000 depicted here may comprise the third source 30 of third light 31 comprising the third bioluminescent material 430. Especially, the third bioluminescent material 430 may comprise the (partially) bioluminescent plant. In embodiments, the first bioluminescent material 410 and the third bioluminescent material 430 may comprise essentially the same bioluminescent plant 450. However, in other embodiments, the first bioluminescent material 410 and the third bioluminescent material 430 may comprise a different bioluminescent plant 450.

[0100] Fig. 1 subfigure V schematically depicts the light generating system 1000 wherein the first bioluminescent material 410 comprises the (partially) bioluminescent plant 450, especially a water plant configured in the vessel 700. Further, the light generating system 1000 depicted here may comprise the second source 20 of second light 21 comprising the second bioluminescent material 420. Especially, the second bioluminescent material 420 may comprise the bioluminescent micro-organism 470, configured in the vessel 700. Yet further, the light generating system 1000 depicted here may comprise the third source 30 of third light 31 comprising the third bioluminescent material 430. Especially, the third bioluminescent material 430 may comprise the (partially) bioluminescent plant, especially a water plant, configured in the vessel 700. In embodiments, the first bioluminescent material 410 and the third bioluminescent material 430 may comprise essentially the same bioluminescent plant 450. However, in other embodiments, the first bioluminescent material 410 and the third bioluminescent material 430 may comprise a different bioluminescent plant 450.

[0101] Fig. 1 subfigure VI schematically depicts the light generating system 1000 wherein the first bioluminescent material 410 comprises the (partially) bioluminescent plant 450, especially a hydroponic bioluminescent plant 455 configured with its roots in the vessel 700. Further, the light generating system 1000 depicted here may comprise the second source 20 of second light 21 comprising the second bioluminescent material 420. Especially, the second bioluminescent material 420 may comprise the bioluminescent micro-organism 470, configured in the vessel 700. Yet further, the light generating system 1000 depicted here may comprise the third source 30 of third light 31 comprising the third bioluminescent material 430. Especially, the third bioluminescent material 430 may comprise the (partially) bioluminescent plant. In embodiments, the first bioluminescent material 410 and the third bioluminescent material 430 may comprise essentially the same bioluminescent plant 450, especially a hydroponic bioluminescent plant 455 configured with its roots in the vessel 700. However, in other embodiments, the first bioluminescent material 410 and the third bioluminescent material 430 may comprise a different bioluminescent plant 450.

[0102] As demonstrated in subfigures IV -VI, in embodiments, the first bioluminescent material 410 may comprise one of a (partially) bioluminescent plant 450, a bioluminescent fungus and a bioluminescent micro-organism 470; and the second source 20 of second light 21 may comprise the second bioluminescent material 420, wherein the second bioluminescent material 420 may comprise another one of a (partially) bioluminescent plant 450, a bioluminescent fungus and a bioluminescent micro-organism 470.

[0103] The (partially) bioluminescent plant 450 may especially, in embodiments, comprise one or more of the group comprising: a flower, a shrub, a moss, a tree, a grass, a fiber crop, an algae, a hydroponic bioluminescent plant 455 and a climber.

[0104] The bioluminescent micro-organism 470 may especially, in embodiments, comprise one or more micro-organisms selected from a genus from the group comprising: Photorhabdus, Shewanella, Aliivibrio, Photobacterium, Vibrio, and Candidatus Photodesmus .

[0105] Fig. 2 schematically depicts some further embodiments of the light generating system 1000. Especially, in embodiments, one or more of the first bioluminescent material 410 and the second bioluminescent material 420 may comprise a partially bioluminescent plant 450, wherein the partially bioluminescent plant 450 may comprise one of: a plant comprising a bioluminescent stem, a plant comprising bioluminescent flowers, and a plant comprising bioluminescent leaves.

[0106] Fig. 2 subfigure I especially depicts a light generating system 1000 wherein the first bioluminescent material 410 comprises a tree 480 comprising a bioluminescent tree trunk 482 and a (non-)bioluminescent tree crown 483. In embodiments, at least part of the (non-)bioluminescent tree crown may be configured to block and / or reflect the first bioluminescent material light 411. Hence, in embodiments, the first bioluminescent material 410 may be configured on a (substantially) vertical surface 600. As depicted in subfigures I and II the vertical surface 600 may comprise the tree 480. In other embodiments, as depicted in subfigure III the vertical surface 600 may comprise a wall 1307. Further, in such embodiments, the light generating system 1000 optionally comprises a light-reflective element 650. The light-reflective element 650 may be configured to direct system light 1001 incident on the light-reflective element 650 to a target area 500. Further, in embodiments, the first bioluminescent material 410 may comprise a light-responsive bioluminescent flower, not depicted here. For example, the first bioluminescent material 410 may comprise a bioluminescent sunflower. In embodiments, during a first period of time an optical signal (e.g. a synthetic optical signal or a signal from the sun) may be provided to the bioluminescent flower, such that the bioluminescent flower may move from a first orientation to a second orientation different from the first orientation. For example, in embodiments, the bioluminescent flower may move from facing the east to facing the west, following the trajectory of the sun during the day. In other embodiments, the movement of the bioluminescent flower may comprise one or more of opening and closing the flower, especially, its petals. Further, in embodiments, during a second period of time the bioluminescent flower may be allowed to move from the second orientation back to the first orientation.

[0107] Fig. 3 schematically depicts an embodiment of a luminaire 2 comprising the light generating system 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 300 comprised by or functionally coupled to the light generating system 1000. Fig. 3 also schematically depicts an embodiment of lamp 1 comprising the light generating system 1000. Hence, Fig. 3 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, such as in embodiments portable lighting device, a solar powered lighting device, and an optical wireless communication device, comprising the light generating system 1000 as described herein. In embodiments, such lighting device may be a lamp 1, a luminaire 2, such as a portable lighting device or a solar powered lighting device, or an optical wireless communication device. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of system light 1001, and may in specific embodiments thus be system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor and reference 1310 to a ceiling; reference 1307 refers to a wall.

[0108] The term “plurality” refers to two or more. The terms “substantially” or “essentially” herein, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein the term “comprises” means “consists of’. The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term "comprising" may in an embodiment refer to "consisting of but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species". Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0109] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0110] The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. In yet a further aspect, the invention (thus) provides a software product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein. The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.

[0111] The invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings.

[0112] The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

CLAIMS:

1. A light generating system (1000) configured to provide system light (1001), wherein the light generating system (1000) comprises a first source (10) of first light (11) and a second source (20) of second light (21), wherein: the first source (10) of first light (11) comprises a first bioluminescent material(410) configured to generate first bioluminescent material light (411) having a first spectral power distribution; the second source (20) of second light (21) is configured to generate second light (21) having a second spectral power distribution different from the first spectral power distribution; wherein the second source (20) comprises one or more of (a) a first light generating device (110) configured to generate first device light (111), (b) a first luminescent material (210) configured to convert at least part of the first bioluminescent material light(411) received by the first luminescent material (210) into first luminescent material light (211); and (c) a second bioluminescent material (420) configured to generate second bioluminescent material light (421); wherein the second light (21) comprises one or more of the first device light (111), the first luminescent material light (211), and the second bioluminescent material light (421); the light generating system (1000) is configured to generate system light (1001) comprising in an operational mode of the light generating system (1000) the first light (11) and the second light (21); the first bioluminescent material (410) comprises a first living organism, and wherein the second bioluminescent material (420) comprises a second living organism.

2. The light generating system (1000) according to claim 1, wherein the first bioluminescent material (410) comprises one of a bioluminescent plant (450), a bioluminescent fungus, and a bioluminescent micro-organism (470); and wherein the second source (20) of second light (21) comprises the first light generating device (100).

3. The light generating system (1000) according to any one of the preceding claims 1-2, wherein the first bioluminescent material (410) comprises one of abioluminescent plant (450), a bioluminescent fungus and a bioluminescent micro-organism (470); and wherein the second source (20) of second light (21) comprises the first luminescent material (210).

4. The light generating system (1000) according to any one of the preceding claims 1-3, wherein the first bioluminescent material (410) comprises one of a bioluminescent plant (450), a bioluminescent fungus and a bioluminescent micro-organism (470); and wherein the second source (20) of second light (21) comprises the second bioluminescent material (420), wherein the second bioluminescent material (420) comprises another one of a bioluminescent plant (450), a bioluminescent fungus and a bioluminescent micro-organism (470).

5. The light generating system (1000) according to claim 2-4, wherein (i) the bioluminescent plant (450) comprises one or more of the group comprising: a flower, a shrub, a moss, a tree, a grass, a fiber crop, an algae, a hydroponic bioluminescent plant (455) and a climber, or (ii) wherein the bioluminescent micro-organism (470) comprises one or more micro-organisms selected from a genus from the group comprising: Photorhabdus , Shewanella, Aliivibrio, Photobacterium, Vibrio, and Candidatus Photodesmus .

6. The light generating system according to any one of the preceding claims, wherein the second source (20) of second light (21) comprises a first light generating device (110) configured to generate first device light (111), and wherein the first light generating device (110) comprises a solid state light source.

7. The light generating system (1000) according to any one of the preceding claims, wherein the system light (1001) comprises white light having a correlated color temperature (CCT) in the range of 2000-7000 K.

8. The light generating system (1000) according to any one of the preceding claims, wherein the light generating system (1000) comprises a third source (30) of third light (31) configured to generate third light (31) having a third spectral power distribution different from the first spectral power distribution and the second spectral power distribution; wherein the third source (30) comprises one or more of (a) a third light generating device (130), configured to generate third device light (131), (b) a third luminescent material (230)configured to convert at least part of the first bioluminescent material light (411) received by the third luminescent material (230) into third luminescent material light (231); and (c) a third bioluminescent material (430) configured to generate third bioluminescent material light (431); wherein the third bioluminescent material (430) comprises a third living organism, and wherein the third light (31) comprises one or more of the third device light (131), the third luminescent material light (231), and the third bioluminescent material light (431); wherein the light generating system (1000) is configured to generate system light (1001) comprising in an operational mode of the light generating system (1000) the first light (11), the second light (21), and the third light (31).

9. The light generating system (1000) according to any one of the preceding claims, wherein one or more of the first bioluminescent material (410) and the second bioluminescent material (420) comprises the bioluminescent plant (450), wherein the bioluminescent plant (450) comprises one of: a plant comprising a bioluminescent stem, a plant comprising bioluminescent flowers, and a plant comprising bioluminescent leaves.

10. The light generating system according to any one of the preceding claims, wherein the first bioluminescent material (410) comprises a tree (480) comprising a bioluminescent tree trunk (482) and a bioluminescent tree crown (483), wherein at least part of the bioluminescent tree crown is configured to block and / or reflect the first bioluminescent material light (411).

11. The light generating system according to any one of the preceding claims, wherein the first bioluminescent material (410) is configured on a vertical surface (600), wherein the light generating system (1000) optionally comprises a light-reflective element (650) configured to direct system light (1001) incident on the light-reflective element (650) to a target area (500).

12. The light generating system according to any one of the preceding claims, wherein the first bioluminescent material (410) comprises a light-responsive bioluminescent flower, wherein during a first period of time an optical signal is provided to the bioluminescent flower, such that the bioluminescent flower moves from a first orientation to a second orientation different from the first orientation, wherein during a second period oftime the bioluminescent flower is allowed to move from the second orientation back to the first orientation.

13. The light generating system (1000) according to any one of the preceding claims, wherein the light generating system (1000) comprises reflecting or scattering elements (550) wherein the reflecting or scattering elements (550) are configured to one or more of (i) mix first light (11) and second light (21) into white system light (1001), and (ii) direct the system light (1001) to a target area (500).

14. The light generating system (1000) according to any one of the preceding claims, further comprising a bioluminescent material control system (340) configured to control a condition of the first bioluminescent material (410).

15. A lighting device (1200) selected from the group of a lamp (1), a luminaire (2), and an optical wireless communication device, comprising the light generating system(1000) according to any one of the preceding claims.

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