Improving thermal performance of spotlight

Abstract

The invention provides a light generating system (1000) comprising a housing (500) and a light generating device (100), where the light generating device (100) comprises an elongate support (150) and a plurality of light sources (10), where the light sources (10) comprise solid state light sources supported by the elongate support (150); wherein the light source is configured to generate light source light (11); wherein the housing (500) is thermally conductive; wherein the housing (500) comprises an inner reflective surface (510) comprising a stepped profile (520) having n steps (521), where n > = 2; wherein the n steps have a step length L1; wherein the inner reflective surface (510) is reflective for the light source light (11); wherein the light generating device (100) is mounted on at least a portion of a step length L1 on the step profile (520) and is configured to be in thermal contact with the housing (500).

Description

Technical Field

[0001] The invention relates to a light generating system. The invention also relates to a lighting device comprising such a light generating system. Background Art

[0002] LED lighting lamps are known in the art. For example, EP3636995 describes an LED lighting lamp with enhanced heat dissipation function. The LED lighting lamp is configured to be assembled into a socket and connected to the socket so that the high-temperature heat generated when the LED is turned on can be quickly dissipated to the outside through the heat dissipation fins formed in the main body to further improve the heat dissipation function, and the assembly is simple, thereby significantly improving productivity and maintainability. The lighting lamp of the present invention includes: a main body having an assembly hole formed inward through the central part of the upper surface of the main body; a plurality of heat dissipation fins, which are formed along the outer peripheral surface of the assembly hole; and a mounting surface, which is formed on the lower part of the main body, and the mounting surface has a single annular heat dissipation groove or a plurality of annular heat dissipation grooves; an LED module, which is installed to be in close contact with the mounting surface formed on the lower part of the main body, and has a plurality of LEDs installed on the bottom surface of the LED module; a cylindrical fastening boss, which is fastened to the LED module by means of screws, and the cylindrical fastening boss is in close contact with the mounting surface of the main body, while Assembled and coupled from the upper side of the main body through the assembly hole; a connecting part, which is assembled to and electrically connected to a socket (the socket is set on a ceiling, a wall surface, etc.), and is assembled and fixed to the outer side of the upper part of the fastening boss; a lens holder, which is assembled and coupled to the bottom surface of the LED module so as to be separated from the bottom surface of the LED module by a predetermined distance, and has a lens installed at a position corresponding to the corresponding LED constituting the LED module so as to diffuse the illumination light emitted from the LED and irradiate the illumination light; and an annular fixing cap, which is coupled to the lower end of the main body and fastened to the lower end by means of a screw, while enclosing the LED module and the lens holder. Summary of the invention

[0003] Light generating devices are of interest for a variety of applications including spotlighting, stage lighting, headlights, home and office lighting, as well as (fluorescence) microscopy and endoscopy, etc. However, operating light sources typically generate heat, which can negatively impact the performance and lifetime of the light generating devices.

[0004] In particular, the performance of semiconductor-based light sources (such as LED-based lamps or solid-state light sources) depends on temperature. Excessive junction temperature may have an adverse effect on the light output (i.e., the brightness of the light provided by the light source). When operating these light sources at low temperatures, these light sources may output light with higher brightness. Typically, these light sources can dissipate heat from the light source into the surrounding environment. However, the temperature difference between the junction temperature and the ambient temperature is not necessarily sufficient to effectively cool the light source. Therefore, inefficient heat dissipation may reduce the efficiency or brightness of the light provided by the light source.

[0005] Prolonged exposure to heat may (also) damage components in the lighting device, such as support elements or the housing of the lighting device. Metal components in the lighting device may expand disproportionately, causing strain on the lighting device. Moreover, the performance of electrical components that facilitate the operation of the light source (e.g., in the control unit or sensor unit) may (also) be affected by the heat dissipated from the light source. Continuous exposure to high temperatures may cause permanent damage to the lighting device. Still further, electronic components may consume more power to operate at higher temperatures.

[0006] Passive cooling may be applied, where heat may be dissipated to the surroundings via a heat sink. Additionally or alternatively, active cooling solutions may be used, which may include providing or circulating a cold liquid along the light source. Both approaches have their own disadvantages. Passive cooling solutions may require a short heat path from the heat source to the surroundings to operate effectively. The cooling of the electronics in the spotlight, including the LED and driver components, may be determined by the surface of the housing. The spotlight may include a heat diffuser that may be in contact with the housing. Heat may be transferred to the heat sink via the heat diffuser and then to the housing. This gradual heat transfer may increase the thermal resistance of the light source to the surroundings. Further, the small volume and area of ​​the housing may limit the heat transfer from the spotlight to the surroundings, and therefore may limit the performance of the spotlight. Passive cooling solutions may also utilize fins or blades in the heat sink structure. However, the fins or blades may be exposed and may therefore be hot to the touch. This may make them difficult to use in situations such as homes, offices, or workshops. Alternatively, active cooling solutions can effectively cool the lighting device, for example, by means of a radiator or circulating cooling liquid. However, such solutions may be cumbersome. For example, a cooling liquid may have to be pumped or circulated to remove heat from the light source. This may increase the power consumed by the device. Further, this may make the lighting device heavier and thus require a bulky construction to accommodate the additional components required to circulate the liquid. Further, dedicated cooling equipment may be relatively expensive.

[0007] Therefore, one aspect of the present invention is to provide an alternative light generating system which preferably further at least partially obviates one or more of the disadvantages described above.It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art or to provide a useful alternative.

[0008] According to a first aspect, the present invention provides a light generating system ("system") comprising a housing and a light generating device ("device"). In particular, the light generating device may include an elongated support. It may also include a plurality of light sources. In particular, the light source may include a solid-state light source. In some embodiments, the light source may be supported by the elongated support. In some embodiments, the light source may be configured to generate light source light. Further, in some embodiments, the housing may be thermally conductive. Still further, in some embodiments, the housing may include an internal reflective surface. In particular, the housing may include a stepped profile having n steps. More particularly, the stepped profile may include n≥2 steps. Further, in some embodiments, the n steps may have a total step length L1. Still further, in some embodiments, the internal reflective surface may be reflective for the light source light. In some embodiments, the light generating device may be mounted on at least a portion of the step length L1 of the stepped profile. Further, in some embodiments, the light generating device may be configured to be in thermal contact with the housing. Therefore, in a specific embodiment, the present invention provides a light generating system, comprising a housing and a light generating device, wherein the light generating device comprises a slender support member and a plurality of light sources; wherein the light sources comprise solid-state light sources supported by the elongated support member, wherein the light sources can be configured to generate light source light; wherein the housing can be heat conductive; wherein the housing comprises an inner reflective surface, the inner reflective surface comprising a step profile having n steps, wherein n ≥ 2, wherein the n steps can have a step length L1; wherein the inner reflective surface can be reflective to the light source light; wherein the light generating device can be mounted on at least a portion of the step length L1 of the step profile and can be configured to be in thermal contact with the housing.

[0009] However, in other embodiments, the light generating system may be configured to generate system light including the light source light. In particular, at least a portion of the system light includes the light source light reflected at the inner reflective surface of the housing. Thus, the present invention may improve the thermal performance of, for example, a spotlight. Further, in some embodiments, the system light may consist essentially of the light source light.

[0010] By means of the present system, thermal management in a light generating system such as a spotlight may be improved. In the present system, the thermal path from the light source to the surroundings may be shorter. The light source may be placed directly on the housing, which may reduce the thermal resistance from the light source to the surroundings, and thus a heat dissipation gain may be achieved. The improved thermal management may result in increased luminous flux, improved efficiency and an extended service life of the light generating system. Another advantage may be that one or more light generating devices may be mounted on the housing (wall), so that space may be left in the center of the lamp for, for example, mounting driver components therein. Additionally or alternatively, solid-state light sources such as microLEDs may be used, which may be beneficially combined with an increased number of light sources compared to light generating devices with a chip-on-board design (CoB). As the number of light sources increases, lamp performance and brightness may be improved, and / or controllability of the system light and its spectral power distribution may be provided or increased. Here below, some general embodiments of the system are first described, and then some more specific embodiments are described.

[0011] In some embodiments, a light generating system may include a housing and a light generating device.

[0012] In particular, the light generating device may be configured to generate device light. In particular, the light generating device may include a light source. In particular, the light source may be configured to generate light source light. In some embodiments, the device light may consist essentially of the device light. In other embodiments, the device light may consist essentially of converted light source light. In other embodiments, the device light may include (unconverted) light source light and converted light source light. The light source light may be converted into luminescent material light using a luminescent material, and / or converted into upconverted light using an upconverter (see also below). The term "light generating device" may also refer to a plurality of light generating devices that can provide device light with substantially the same spectral power distribution. In a specific embodiment, the term "light generating device" may also refer to a plurality of light generating devices that can provide device light with different spectral power distributions.

[0013] The term "light source" may in principle relate to any light source known in the art. It may be a conventional (tungsten) bulb, a low-pressure mercury lamp, a high-pressure mercury lamp, a fluorescent lamp, an LED (light emitting diode). In a particular embodiment, the light source comprises a solid-state LED light source (such as an LED or a laser diode (or "diode laser")). The term "light source" may also relate to a plurality of light sources, such as a 2-2000 (solid-state) LED light source. Therefore, the term LED may also refer to a plurality of LEDs. Further, the term "light source" may also refer to a so-called chip-on-board (COB) light source in some embodiments. The term "COB" refers in particular to an LED chip in the form of a semiconductor chip, which is neither boxed nor connected but mounted directly on a substrate such as a PCB. Therefore, a plurality of light-emitting semiconductor light sources may be arranged on the same substrate. In some embodiments, a COB is a multi-LED chip configured together as a single lighting module. The term "light source" may also refer to a chip-scale package (CSP). A CSP may include a single solid-state die, on which a layer including a luminescent material is arranged. The term "light source" may also refer to a medium-power package. A medium-power package may include one or more solid-state dies (one or more). The die (one or more) may be covered by a layer containing a luminescent material. The die size may be equal to or less than 2 mm, such as in the range of, for example, 0.2 mm to 2 mm. Therefore, in some embodiments, the light source comprises a solid-state light source. Further, in a particular embodiment, the light source comprises a chip-scale packaged LED. Here, the term "light source" may also particularly refer to a small solid-state light source, such as having a mini size or a micro size. For example, the light source may include one or more mini LEDs and micro LEDs of a mini LED and a micro LED. In particular, in some embodiments, the light source may include a micro LED or "microLED" or "μLED". Herein, the term mini size or mini LED particularly refers to a solid-state light source having a size (such as a die size, in particular, length and width) selected from the range of 100μm to 1mm. Herein, the term μ size or micro LED particularly refers to a solid-state light source having a size (such as a die size, in particular, length and width) selected from the range of 100μm or less.

[0014] A light source may have a light escape surface. With reference to a conventional light source, such as a light bulb or a fluorescent lamp, it may be the outer surface of a glass or quartz envelope. For an LED, it may be, for example, the LED die, or when a resin is applied to the LED die, it may be the outer surface of a resin. In principle, it may also be the terminal end of an optical fiber. The term escape surface particularly relates to a part of a light source, where light actually leaves or escapes from the light source. The light source is configured to provide a light beam. The light beam (therefore) escapes from the light exit surface of the light source.

[0015] Likewise, the light generating device may comprise a light escape surface, such as an end window. Further, also, the light generating system may comprise a light escape surface, such as an end window.

[0016] The term "light source" may refer to a semiconductor light emitting device, such as a light emitting diode (LED), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSEL), an edge emitting laser, etc. The term "light source" may also refer to an organic light emitting diode (OLED), such as a passive matrix (PMOLED) or an active matrix (AMOLED). In certain embodiments, the light source includes a solid-state light source (such as an LED or a laser diode). In some embodiments, the light source includes an LED (light emitting diode). The term "light source" or "solid-state light source" may also refer to a superluminescent diode (SLED).

[0017] The term LED may also refer to a plurality of LEDs.

[0018] The term "light source" may also refer to a plurality of (substantially identical (or different)) light sources, such as 2 to 2000 solid-state light sources. In some embodiments, the light source may include one or more micro-optical elements (micro-lens arrays) downstream of a single solid-state light source (such as an LED) or downstream of a plurality of solid-state light sources (i.e., for example, a solid-state light source shared by a plurality of LEDs). In some embodiments, the light source may include an LED with on-chip optics. In some embodiments, the light source includes a pixelated single LED (with or without optics) (in some embodiments, providing on-chip beam steering).

[0019] In some embodiments, the light source can be configured to provide a primary radiation that is used as such, such as, for example, a blue light source (e.g., a blue LED), or a green light source (e.g., a green LED) and a red light source (e.g., a red LED). Such LEDs that may not include a luminescent material ("phosphor") may be indicated as direct color LEDs.

[0020] However, in other embodiments, the light source may be configured to provide primary radiation, and a portion of the primary radiation is converted into secondary radiation. The secondary radiation may be based on the conversion of the luminescent material. Therefore, the secondary radiation may also be indicated as luminescent material radiation. In some embodiments, the light source (such as an LED having a luminescent material layer or a dome including luminescent material) may include a luminescent material. Such an LED may be indicated as a phosphor-converted LED or a PC LED (phosphor-converted LED). In other embodiments, the luminescent material may be configured at a certain distance ("remote") from the light source (such as an LED whose luminescent material layer is not in physical contact with the die of the LED). Therefore, in a particular embodiment, the light source may be a light source that emits at least light of a wavelength selected from the range of 380nm to 470nm during operation. However, other wavelengths are also possible. This light may be used in part by the luminescent material.

[0021] In some embodiments, the light generating device may include a luminescent material. In some embodiments, the light generating device may include a PC LED. In other embodiments, the light generating device may include a direct LED (i.e., without phosphor). In some embodiments, the light generating device may include a laser device, such as a laser diode. In some embodiments, the light generating device may include a super luminescent diode. Thus, in certain embodiments, the light source may be selected from the group of a laser diode and a super luminescent diode. In other embodiments, the light source may include an LED.

[0022] The light source may specifically be configured to generate a source light having an optical axis (O) (beam shape) and a spectral power distribution. In some embodiments, the source light may include one or more wavelength bands, the width of which is known to the laser.

[0023] The term "light source" may (thus) refer to one or more of the following: the light generating element itself (such as, for example, a solid-state light source), or for example to the packaging of the light generating element (such as, a solid-state light source), and one or both of the luminescent material-containing element and the (other) optical device (such as a lens, a collimator). The light converter element ("converter element" or "converter") may include a luminescent material-containing element. For example, a solid-state light source such as, for example, a blue LED is itself a light source. The combination of a solid-state light source (as a 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 (and may also be indicated as a light generating device). Thus, a white LED is a light source (and may also be indicated as, for example, a (white) light generating device).

[0024] The term "light source" herein may refer to a light source including a solid state light source, such as an LED or a laser diode or a super luminescent diode.

[0025] Thus, in some embodiments, the term "light source" may also (therefore) refer to a light source that is (also) based on light conversion, such as a light source in combination with a luminescent converter material. Thus, the term "light source" may also refer to a combination of an LED and a luminescent material configured to convert at least a portion of the LED radiation, or a combination of a (diode) laser and a luminescent material configured to convert at least a portion of the (diode) laser radiation.

[0026] In some embodiments, the term "light source" may also refer to a combination of a light source (such as an LED) and an optical filter that can change the spectral power distribution of the light generated by the light source. In particular, the term "light generating device" may be used to refer to a light source and other (optical components), such as optical filters and / or beam shaping elements, etc.

[0027] The phrase "different light sources" or "multiple different light sources" and similar phrases may refer to multiple solid-state light sources selected from at least two different bins in some embodiments. Similarly, the phrase "same light source" or "multiple same light sources" and similar phrases may refer to multiple solid-state light sources selected from the same bin in some embodiments.

[0028] The terms "solid-state light source" or "solid-state material light source" and similar terms may particularly refer to semiconductor light sources, such as light emitting diodes (LEDs), diode lasers or superluminescent diodes.

[0029] In particular, the light generating device may include a plurality of light sources. More particularly, in some embodiments, the plurality of light sources may include solid-state light sources. In particular, the plurality of light sources may be configured to generate light source light. The solid-state light source may be an LED, such as a microLED (see also above and below).

[0030] In particular, the light generating device may comprise an elongated support. The elongated support may be a rigid support or a semi-rigid support. However, the elongated support may also be flexible. A plurality of light sources (comprising the light generating device) may be supported by the elongated support (which the light generating device may also comprise). The elongated support may comprise a component which may electrically connect one or more of the light sources to an electrical component and / or an (external) power supply. For example, the elongated support may comprise a PCB (see also below).

[0031] Note that the term "light generating device" may also refer to a plurality of light generating devices.

[0032] As indicated above, the light generating system may include a housing. The housing may be configured to at least partially enclose a plurality of light sources. Further, the housing may at least partially enclose electronics, such as, for example, a driver for the plurality of light sources.

[0033] In some embodiments, the light generating system may include a housing and a light transmissive window. The housing and the light transmissive window may form an enclosure for the plurality of light sources. The light transmissive window may include a light transmissive material. The light transmissive window may be transparent or translucent. In particular, the light transmissive window may be transparent. The light transmissive window may be substantially planar, or may have an enclosure shape.

[0034] The light-transmitting material may include one or more materials selected from the group consisting of transmissive organic materials, such as one or more materials selected from the group consisting of: PE (polyethylene), PP (polypropylene), PEN (polyethylene naphthalate), PC (polycarbonate), polyurethane (PU), polymethacrylate (PMA), polymethyl methacrylate (PMMA) (Plexiglas or Perspex), polymethacrylimide (PMI), polypyromellitimide (PMMI), styrene acrylonitrile resin (SAN), cellulose acetate butyrate (CAB), silicone, polyvinyl chloride (PVC), polyethylene terephthalate (PET), including PETG (ethylene glycol-modified polyethylene terephthalate) in some embodiments, PDMS (methyl siloxane) and COC (cyclic olefin copolymer). In particular, the light-transmitting material may include an aromatic polyester or a copolymer thereof, such as, for example, one or more of the following: polycarbonate (PC), poly(methyl)acrylate (P(M)MA), polyglycolide or polyglycolic acid (PGA), polylactic acid (PLA), polycaprolactone (PCL), polyethylene adipate (PEA), polyhydroxyalkanoate (PHA), polyhydroxybutyrate (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN). In particular, the light-transmitting material may include polyethylene terephthalate (PET). Therefore, the light-transmitting material is particularly a polymer light-transmitting material. However, in another embodiment, the light-transmitting material may include an inorganic material. In particular, the inorganic light-transmitting material may be selected from the group consisting of: glass, (fused) quartz, transmissive ceramic material and silicone. In addition, a hybrid material comprising an inorganic part and an organic part may be applied. In particular, the light-transmitting material comprises one or more of the following: PMMA, transparent PC or glass. For example, the light-transmitting material may comprise a ceramic body, such as a garnet-type material. In an alternative embodiment, the light-transmitting material may comprise an alumina material, such as an Al-based 2 O 3 In some embodiments, the light-transmitting material may include, for example, sapphire. Other materials are also possible, such as one or more of the following: CaF 2、MgO、BaF 2 , A 3 B 5 O 12 Garnet, ALON (aluminum oxynitride), MgAl 2 O 4 and MgF 2 .

[0035] In some embodiments, the housing and optional light transmissive window may provide a retrofit lamp.

[0036] The system may comprise an assembly of a housing and a light generating device(s) and optionally a light transmissive window. The term "light assembly" or "light unit" may also be applied instead of the term "assembly". For example, the light assembly may be a spotlight.

[0037] The housing may include a housing wall. In some embodiments, the housing wall may include a material selected from the group consisting of aluminum, steel, copper, brass, polymer materials, ceramic materials, and 3D printed materials. In certain embodiments, the housing may include a metal (or a metallic material). Due to the variable wall thickness, die casting may be required to use metal for the housing material.

[0038] In some embodiments, the housing may further comprise an inner reflective surface which is particularly reflective for the light source light. More particularly, the inner reflective surface may provide a specular reflection of the light source light. The inner reflective surface may be provided, for example, by an aluminum coating, a silver coating or a white coating (on the housing wall). Alternatively or additionally, at least a portion of the housing wall or even substantially the entire housing wall may be provided by a material that reflects the light itself, such as, for example, aluminum, steel, copper or brass. Further, the polymer material may be reflective, for example, by embedded metal particles and / or embedded white particles. Further still, the ceramic material may be diffusely reflective. Further still, the 3D printed material may be reflective, for example, by embedded metal particles and / or embedded white particles.

[0039] Thus, in some embodiments, the housing may be a monolithic body having an internal reflective surface.

[0040] Further, in some embodiments, the inner reflective surface may include a step profile having n steps (or "step windings"). In particular, n may be selected from a range of ≥2, such as a range of ≥3 or a range of ≥4 (in particular, a range of 2 to 8, such as a range of 3 to 6).

[0041] The housing may include a first housing end and a second housing end. The light generating device (more particularly, the light source) may be arranged between the first housing end and the second housing end. Further, the housing and the optional enclosure may include a lamp axis. A virtual lamp axis may virtually connect the first housing end and the second housing end. The lamp axis may be an axis of rotational symmetry.

[0042] When following the housing wall in the direction from one housing end to the second housing end, two or more steps may be encountered. Each step may completely surround the lamp axis, but other embodiments are not excluded herein. As further indicated below, in some embodiments, such steps may surround the lamp axis in a circular manner or in a spiral form. The term "winding" or "step winding" may also be applied instead of the term "step".

[0043] The n steps may comprise a total step length L1. The term "step length" is also used herein instead of the term "total step length". In particular, the step length may be defined as the total length of the step winding. For example, the total step length L1 may be selected from the range of 4 cm to 100 cm, such as from the range of 5 cm to 75 cm, in particular, from the range of 10 cm to 60 cm.

[0044] Furthermore, the step winding may have a diameter (or step diameter) and a step width. In particular, in some embodiments, the diameter may be selected from the range of 10 mm to 80 mm, such as the range of 15 mm to 65 mm, more particularly, from the range of 20 cm to 50 cm. Alternatively or additionally, in some embodiments, the step width may be selected from the range of 0.5 mm to 15 mm, such as the range of 1 mm to 5 mm.

[0045] When the step surrounds the lamp axis in a circular manner, the diameter of the step winding may be constant for a single step winding. However, for each step winding, the diameter may increase in the direction from the first shell end to the second shell end. When the step winding surrounds the lamp axis in a spiral manner, the diameter of the step winding may increase constantly in the direction from the first shell end to the second shell end. However, in embodiments of substantially the entire step profile, the step width may be constant. Therefore, in the case of a spiral step profile, in some embodiments, the diameter of the step winding may gradually increase in the direction from the first shell end to the second shell end, and in the case of a step winding surrounded in a circular manner, in (other) embodiments, the diameter of the step winding may gradually increase in the direction from the first shell end to the second shell end.

[0046] The step may have an inner diameter and an outer diameter. Here, the diameter of a step winding may be defined as the diameter of the middle of the winding. For example, a winding with an inner diameter of 25 mm and an outer diameter of 35 mm may have a diameter of 30 mm.

[0047] Each step winding may have a step winding length. This may be the length of the respective winding determined along the diameter. Thus, in an example where the diameter D of the step winding may be constant for a single step winding, the length of such a step winding may be π*D. When there are n step windings, each step winding has a respective diameter D of the step winding. i , which is constant for the corresponding single step winding, and the total step length is For a helical step profile (wherein the diameter gradually increases in a direction from the first housing end to the second housing end), the total step length may be substantially the length of the vortex defined along the varying diameter.

[0048] Furthermore, in some embodiments, the outer side of the housing may hug the stepped profile of the inner reflective surface. However, in another embodiment, the outer side of the housing may have a rounded cone shape. Thus, in the previous embodiment, the outer side of the housing may also have a stepped profile.

[0049] In some embodiments, the light generating device may be mounted on at least a portion of a step length L1 of the step profile of the inner reflective surface.The elongated support may be configured to be substantially conformal to at least a portion of the step length L1.

[0050] Thus, assuming n steps enclosing the lamp axis in a circular form, there may be, for example, k elongated supports, where 2≤k≤n. Thus, two or more of the n step windings may be provided with a light generating device. In such an embodiment, the light generating device for the respective step winding may also have a substantially constant diameter, which may be substantially the same as the diameter of the step winding. In particular, in some embodiments, the term "k elongated supports" may refer to k light generating devices.

[0051] However, assuming that n steps are included in a spiral step profile surrounding the lamp axis, there may be a single slender support. Therefore, two or more of the n step windings may be provided with a single light generating device. When the step winding surrounds the lamp axis in a spiral manner, the diameter of the light generating device may increase constantly in the direction from the first shell end to the second shell end, and this (local) diameter may be substantially the same as the (local) diameter of the step winding.

[0052] In particular, in some embodiments, the light generating device can be mounted on 50% of the step length L1 on the step profile of the inner reflective surface, such as 60% of the step length L1, in particular 70% of the step length L1, even more particularly 80% of the step length L1, such as 90% of the step length L1, including 100% of the step length L1.

[0053] In particular, the elongated support may have a support length L2. Instead of the term "support length", the term "total support length" may also be used. For example, when two or more light generating devices are applied, the sum of the support lengths is the total support length. Assuming n steps enclosing the lamp axis in a circular manner, k elongated supports, where k=n, the total support length L may be, for example, up to or a percentage thereof (see also below). However, for a spiral step profile (wherein the diameter gradually increases in the direction from the first housing end to the second housing end), the total support length L2 may be substantially the length of the vortex determined along the varying diameter or a percentage thereof (see also below). In a particular embodiment, the total support length L2 may be at least 50% of the total step length L1. In particular, in some embodiments, 0.5≤L2 / L1≤1 (see also below).

[0054] In particular, the light generating device may (therefore) be configured to be in thermal contact with the housing, for example, directly in thermal contact with the housing, or indirectly in thermal contact with the housing via an intermediate thermally conductive material (such as a thermally conductive adhesive or a thermally conductive solder). More particularly, in some embodiments, the light generating device may be configured to be in physical contact with the internal reflective surface. Further, the housing may include a thermally conductive material.

[0055] In some embodiments, the light generating system may be configured to generate system light. The system light may include source light, and in particular, at least a portion of the system light may include source light reflected at an inner reflective surface of the housing. In some embodiments, the system light may be white light.

[0056] The term "white light" herein is known to the person skilled in the art. It particularly relates to light having a correlated color temperature (CCT) between about 1800K and 20000K, such as between 2000K and 20000K, particularly between 2700K and 20000K, and for general lighting, particularly in the range of about 2700K to 6500K. In some embodiments, for backlighting purposes, the correlated color temperature (CCT) may particularly be in the range of about 7000K to 20000K. Still further, in some embodiments, the correlated color temperature (CCT) is particularly within about 15SDCM (standard deviation of color matching) from the BBL (black body locus), particularly within about 10SDCM from the BBL, even more particularly within about 5SDCM from the BBL. In particular, in some embodiments, the system light may be warm white light. Additionally or alternatively, in some embodiments, the system light may be cool white light. Further, in some embodiments, the correlated color temperature of the system light may be selected from the range of 1800K to 20000K, such as from the range of 5000K to 20000K, such as from the range of 1800K to 12000K. Additionally or alternatively, the color rendering index of the system light may be selected from the range of ≥80, such as from the range of ≥90, such as from the range of ≥95. However, the system light may also be colored light (see also below).

[0057] In some embodiments, the light generating system may include a driver, in particular, an LED driver. The driver may be configured to protect the light generating device from (undesired) voltage and / or current fluctuations. Furthermore, the driver may also be configured to rectify a high voltage with alternating current to a low voltage with direct current. Basically, the driver may be configured to cause a voltage and current change in the light generating system. The driver may be at least partially enclosed by a housing.

[0058] By means of the present system, the thermal performance of the system can be improved. Configuring the light generating device to be in direct physical contact with the internal reflective surface rather than using an intermediate material (such as a heat diffuser or adhesive) reduces the number of heat transfer steps. As the number of heat transfer steps is reduced, thermal resistance can also be reduced. Additionally or alternatively, using a thermally conductive material having a thermal conductivity of at least 0.8 W / (m*K) for the housing may help further reduce the thermal resistance of the system. Reducing thermal resistance can improve passive cooling of the system, thereby extending the service life of the system.

[0059] Additionally or alternatively, the variable support length L2 may advantageously incorporate an increased number of light sources compared to a light generating device having a chip-on-board design (CoB).With an increased number of light sources, lamp performance and brightness may be improved.

[0060] In a particular embodiment, the light generating device can be configured to be in physical contact with the inner reflective surface, in particular, the light generating device can be mounted on a step of the inner reflective surface in direct physical contact. In other particular embodiments, the light generating device can be configured to be in physical contact with the reflective surface for at least 70%, such as at least 80%, such as at least 80%, for example at least 90%, in particular at least 95%, more particularly at least 99%, including 100%.

[0061] In some embodiments, the elongated support member can be configured to be in thermal contact with the reflective surface over at least 70% of the support member length L2, such as at least 80%, as at least 80%, for example at least 90%, particularly at least 95%, more particularly at least 99%, including 100%.

[0062] As indicated above, in some embodiments, the housing may include a thermally conductive material. In particular, the thermal conductivity of the thermally conductive material may be selected from a range of ≥0.8 W / (m*K), such as selected from a range of >1 W / (m*K), such as selected from a range of >5 W / (m*K), and in particular, selected from a range of >20 W / (m*K). The thermal conductivity of the thermally conductive material may be in particular at least about 20 W / (m*K), such as at least about 30 W / (m*K), such as at least about 100 W / (m*K), such as in particular at least about 200 W / (m*K). In yet other specific embodiments, the thermal conductivity of the thermally conductive material may be in particular at least about 10 W / (m*K). In some embodiments, the thermally conductive material may include one or more of the following: copper, aluminum, silver, gold, silicon carbide, aluminum nitride, boron nitride, silicon carbide aluminum, beryllium oxide, silicon carbide composite, silicon carbide aluminum, copper-tungsten alloy, molybdenum carbide copper, carbon, diamond, and graphite. Alternatively or additionally, the thermally conductive material may include or consist of aluminum oxide.

[0063] In a particular embodiment, the thermally conductive material may be selected from the group consisting of aluminum, steel, copper, brass, polymer materials, ceramic materials, and 3D printed materials (and the thermal conductivity is selected from the range of ≥ 0.8 W / (m*K)). Thus, the thermally conductive material may provide for the dissipation of heat generated by the light generating device to the surrounding environment, and thus it may provide passive cooling of the light generating system (more particularly, the light generating device). Additionally or alternatively, in some embodiments, the thermally conductive material may also include one or more of the following: silver, gold, tungsten, zinc, aluminum nitride, silicon carbide, diamond, and graphite.

[0064] As indicated above, the term "light generating device" may in some embodiments refer to a plurality of light generating devices. Thus, the term "elongated support" may in some embodiments refer to a plurality of elongated supports.

[0065] Thus, in some embodiments, the elongated support may include one or more separate elongated support members. A plurality of light sources may be arranged on one or more elongated support members. For example, there may be an equal number of light sources on each of the two or more elongated support members. However, in other embodiments, there may also be unequal numbers of light sources on two or more of the two or more elongated support members. Furthermore, the support member lengths of the two or more elongated support members may be equal or unequal.

[0066] One or more elongated supports (together) may have a total support length L2. For example, the total support length L2 may be selected from the range of 4 cm to 100 cm, such as the range of 5 cm to 75 cm, in particular the range of 10 cm to 60 cm. As indicated above, the total support length L2 may be selected such that 0.5 ≤ L2 / L1 ≤ 1. In a particular embodiment, 0.7 ≤ L2 / L1 ≤ 0.9, such as such that 0.85 ≤ L2 / L1 ≤ 0.99.

[0067] In some embodiments, the elongated support member can be mechanically attached to the inner reflective surface. This can provide the benefit of improving the thermal performance of the system. Attaching the light generating device mechanically rather than using an adhesive to be in direct physical contact with the inner reflective surface reduces the number of heat transfer steps. As the number of heat transfer steps is reduced, thermal resistance may also be reduced. Reducing thermal resistance can improve passive cooling of the system, thereby extending the service life of the system. In a particular embodiment, the elongated support member can be attached to the inner reflective surface by using a clip. In another embodiment, the elongated support member can be attached to the inner reflective surface by heat riveting or thermoplastic riveting. Further, in another embodiment, the elongated support member can be attached to the inner reflective surface via a small ridge, wherein the elongated support member can be stuck between the inner reflective surface and the ridge, thereby locking the elongated support member in place. Moreover, the elongated support member can be attached to the inner reflective surface using a method selected from the group including the following: screwing, edge locking, reverse locking, screw locking and snap locking. Alternatively or additionally, the elongated support member can be attached to the inner reflective surface via a (thermally conductive) adhesive (also see above).

[0068] Therefore, the light generating system may include an internal reflection surface. Assuming vertical illumination of the light source light on the internal reflection surface, the reflection of the light source light by the internal reflection surface may be in the range of at least 70%, more particularly at least 75%, and even more particularly at least 80%, such as R ≥ 85% in some embodiments. Therefore, in certain embodiments, the light generating system may include an internal reflection surface, wherein assuming vertical illumination of the light source light on the internal reflection surface, the reflection of the light source light by the internal reflection surface may be in the range of R ≥ 85%. This may provide the advantage of improving the luminous efficiency of the light generating system. In some embodiments, assuming vertical illumination of the light source light on the internal reflection surface, the reflection of the light source light by the internal reflection surface may be at least 90%, such as at least 95%, particularly at least 98%, more particularly at least 99%, including 100%. Further, in some embodiments, the internal reflection surface may, for example, include a reflector, a mirror, or an aluminum foil.

[0069] As indicated above, the housing and optional enclosure may have an axis (indicated herein as the lamp axis). The axis may be parallel to or even coincide with the optical axis of the system light (see also below). In some embodiments, the lamp axis may be defined as an imaginary line defining a path through the housing and optional enclosure of the light generating system along which the light propagates through the system. In particular, the lamp axis may coincide with the direction of the light having the highest radiant flux.

[0070] In some embodiments, at least one of the n steps of the step profile may be inclined relative to the lamp axis. In other embodiments, all n steps of the step profile may be inclined relative to the lamp axis. More particularly, one or more of the n steps of the step profile may be inclined relative to a plane perpendicular to the lamp axis. For example, in some embodiments, one or more of the steps of the step profile may be inclined relative to a plane perpendicular to the lamp axis by at least 2°, such as at least 2°, such as selected from the range of 5° to 45°. In a particular embodiment, all steps of the step profile may be inclined relative to a plane perpendicular to the lamp axis.

[0071] In some embodiments, at least one of the n steps of the step profile may be in a plane perpendicular to the lamp axis. In a particular embodiment, all n steps of the step profile may be in a plane perpendicular to the lamp axis.

[0072] In some embodiments, at least one of the n steps of the step profile may have a curved shape, such as a parabola. Thus, in a plane including the lamp axis, the cross-sectional shape of at least one of the n steps may be curved, such as a parabola. In a particular embodiment, all n steps of the step profile may have a curved shape, such as a parabola. In particular, a curved shape such as a parabola may be concave (although a convex shape is not excluded).

[0073] In some embodiments, all steps of the step are arranged in parallel.

[0074] As indicated above, in some embodiments, the step profile may have a tapered spiral shape. This may provide the benefit of easy assembly and control of the light generating device. The use of a spiral shape may allow a single light generating device to cover the entire surface of the step profile, which may result in a single light generating device having to be incorporated into the light generating system assembly and electrically connected. However, furthermore, in embodiments where the step has a tapered spiral profile or shape, multiple light generating devices may be applied.

[0075] In some embodiments, the step profile can have a spiral shape, such as a conical spiral shape. In particular, in some embodiments, the step profile can have a spiral shape. Additionally or alternatively, the step profile can have a plurality of spiral shapes, in particular, a double spiral shape (or "double vortex shape"), even more particularly a triple spiral shape (or "triple vortex shape"). Therefore, in some embodiments, the step profile can have a plurality of spiral shapes. In a particular embodiment, the step profile can have a double vortex spiral shape. In another embodiment, the step profile can have a triple vortex spiral shape.

[0076] In some embodiments, the light generating system may include a light generating device. In some embodiments, the light generating device may include a first end and a second end. Further, the light generating system may include an electrical connector for connecting to an external electrical energy source. The first end of the light generating device may be configured to be closer to the electrical connector than the second end.

[0077] Still further, in some embodiments, the light generating system may include an electronic device configured in the housing. It can be derived from the above that such an electronic device may include a driver, such as an LED driver. In particular, the light generating system may include an electrical connection between the electronic device and the light generating device.

[0078] The term "electrical connector" may also refer to a plurality of electrical connectors.

[0079] In some embodiments, the electronic device can be connected to the light generating device at a position closer to the first end than the second end. Thus, in certain embodiments, the light generating system can include a light generating device, wherein the light generating device can include a first end and a second end; wherein the light generating system can include an electrical connector for connecting to an external electrical energy source, wherein the first end can be configured to be closer to the electrical connector than the second end; wherein the light generating system can include the electronic device configured in the housing; wherein the light generating system can also include an electrical connector between the electronic device and the light generating device, wherein the electrical connector can be connected to the light generating device at a position closer to the first end than the second end.

[0080] Thus, in some embodiments, the light generating system may include electronics arranged in a housing. These electronics may be functionally coupled with an electrical connector. In some embodiments, there may be an electrical connection between the electronics and the light generating device.

[0081] In some embodiments, because there may be more than one light generating device, there may be one or more electrical connectors between the electronic device and the multiple light generating devices. In some embodiments, the electrical connector may be connected to the light generating device at a position closer to the first end of the light generating device than the second end of the light generating device. More specifically, the electrical connector may be connected to the one or more light generating devices at a position closer to the first end of the one or more light generating devices than the second end of the one or more light generating devices. During operation, the electrical connector may provide a circuit for causing electrical energy to flow from an external electrical energy source to the one or more light generating devices via the electrical connector and the electronic device.

[0082] It may be advantageous to concentrically arrange the steps of the step profile and to mount at least two light generating devices on these steps, in particular steps arranged in concentric circles or in the shape of a plurality of concentrically arranged spirals, since this may allow easy integration of a multi-scene switching drive (see also below).

[0083] In a specific embodiment, a double helix (double vortex structure) may be applied. For example, using multiple spiral shapes can allow a multi-scene switching driver to be implemented in a light generating system. The multi-scene switching driver can provide flexibility in controlling the lumen output of the light generating system.

[0084] In some embodiments, since there are multiple light sources, this may allow control of one or more of the following: beam shape of the system light, radiant flux of the system light, and spectral power distribution of the system light. Likewise, in some embodiments, there may be more than one light generating device, which may (alternatively or additionally) allow control of one or more of the following in some embodiments: beam shape of the system light, radiant flux of the system light, and spectral power distribution of the system light.

[0085] Thus, in some embodiments, the system may include a control system configured to control a light generating device (i.e., in embodiments in which there is more than one light generating device, including controlling a plurality of light generating devices). In a number of embodiments, the control system may be configured in the housing. In other embodiments, the control system may be configured outside the housing. In still other embodiments, the control system may include a slave control system configured in the housing and an external master control system configured outside the housing. In particular, the control system may be configured to control one or more of the following: a beam shape of the system light, a radiant flux of the system light, and a spectral power distribution of the system light.

[0086] The term "control" and similar terms particularly refer to at least determining the behavior of an element or the operation of a monitoring element. Therefore, "control" and similar terms herein, for example, may refer to applying behavior to an element (determining the behavior of an element or the operation of a monitoring element), such as, for example, measuring, displaying, actuating, opening, shifting, changing temperature, etc. In addition, the term "control" and similar terms may also include monitoring. Therefore, the term "control" and similar terms may include: applying behavior to an element, and applying behavior and monitoring elements to an element. The control of an element may be accomplished by a control system, which may also be indicated as a "controller". The control system and the element may therefore be functionally coupled at least temporarily or permanently. The element may include a control system. In some embodiments, the control system and the element may not be physically coupled. Control may be accomplished via wired control and / or wireless control. The term "control system" may also refer to a plurality of different control systems, which are particularly functionally coupled, and wherein, for example, one control system may be a master control system, and one or more other control systems may be slave control systems. The control system may include or may be functionally coupled to a user interface.

[0087] The control system may also be configured to receive and implement instructions from a remote controller. In some embodiments, the control system may be controlled via an App on a device (such as a portable device, such as a smart phone or iPhone, a tablet computer, etc.). Therefore, the device does not have to be coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system. Therefore, in some embodiments, the control system may (also) be configured to be controlled by an App on a remote device. In such an embodiment, the control system of the lighting system may be a slave control system or a control in slave mode. For example, the lighting system may be identified using a code (in particular, a unique code for the corresponding lighting system). The control system of the lighting system may be configured to be controlled by an external control system that accesses the lighting system based on a (unique) code (entered by a user interface having an optical sensor (e.g., a QR code reader)). The lighting system may also include a component for communicating with other systems or devices (such as on the basis of Bluetooth, WIFI, LiFi, ZigBee, BLE or WiMAX or other wireless technologies).

[0088] A system or device or apparatus may implement actions in a "mode" or "operating mode" or "mode of operation" or "operable mode". The term "operable mode" may also be indicated as a "control mode". Likewise, in a method, actions or phases or steps may be implemented in a "mode" or "operating mode" or "mode of operation" or "operable mode". This does not exclude that the system or device or apparatus may also be adapted to provide another control mode or multiple other control modes. Likewise, this does not exclude that one or more other modes may be implemented before and / or after the implementation mode.

[0089] However, in some embodiments, a control system may be provided, which is adapted to provide at least a control mode. If other modes are available, the selection of these modes may in particular be implemented via a user interface, but other options (such as implementing a mode in dependence on sensor signals or a (time) scheme) are also possible. An operating mode may also refer in some embodiments to a system, device or apparatus that can only be operated in a single operating mode (i.e. "switched on", without further tunability).

[0090] Therefore, in some embodiments, the control system may be controlled according to 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.

[0091] Additionally or alternatively, in some embodiments, the light generation system may include a multi-scene switching driver. The multi-scene switching driver may allow the luminous flux of the light generation system to be controlled based on a change in current or based on a change in the number of activated light generation devices. In particular, in some embodiments, a light generation system including at least two light generation devices may provide multiple scenes. The scene may include a light setting with a lumen output change. In some embodiments, the multi-scene switching driver may be configured to switch between a low luminous flux scene, an average luminous flux scene, and a high luminous flux scene. In particular, the multi-switching driver may be configured to switch between two or more scenes (such as three or more scenes, such as four or more scenes, and in particular five or more scenes). Further, the multi-scene switching driver scene may include a light setting with a system light color change. For example, in some embodiments, the multi-scene switching driver scene may include a scene selected from a group including the following items: a warm white light scene, a cold white light scene, a blue light scene, a green light scene, a yellow light scene, an orange light scene, a red light scene, a magenta light scene, and a purple light scene. In some embodiments, the electronic device may include a multi-scene switching driver. In some embodiments, the control system may include a multi-scene switching driver.

[0092] In certain embodiments, the housing may include a slit. More particularly, the inner reflective surface may include a slit. In certain embodiments, the slit may include an electrical connector (see above). In certain embodiments, the light generating system may include an electronic device configured in a housing, wherein the housing may include a slit, wherein the slit may also include an electrical connector, wherein the electrical connector may be configured to electrically connect one or more light generating devices, and in certain embodiments, electrically connect at least two light generating devices. Through such a system, two or more light generating devices in the light generating system may be electrically connected, for example. In certain embodiments, two or more light generating devices may be electrically connected together. Alternatively or additionally, in (other embodiments), two or more light generating devices may also be electrically connected separately. In certain embodiments, the slit may have a cross-sectional shape selected from a group including the following items: a curved shape, a cubic shape, a triangular shape, and a polygonal shape. Additionally or alternatively, in certain embodiments, the slit may have a cross-sectional shape of an irregular shape. Further, the gap may have a depth and a width, wherein the depth may be selected from the range of 0.5 mm to 10 mm, such as from the range of 1 mm to 5 mm, and wherein the width may be selected from the range of 0.5 mm to 10 mm, such as from the range of 1 mm to 5 mm. In some embodiments, the depth and width of the gap may have an aspect ratio of 1:1. Additionally or alternatively, in some embodiments, the depth and width of the gap may have an aspect ratio of 1:2 or 2:1. Further, in another embodiment, the depth and width of the gap may have an aspect ratio of 1:3 or 3:1. In particular, in some embodiments, the depth and width of the gap may have an aspect ratio of 2:3 or 3:2.

[0093] In some embodiments, the gap may include an electrical connector as defined above. In particular, in some embodiments, the electrical connector may be configured such that it may be electrically isolated from the housing. Further, the electrical connector may be configured to electrically connect the light generating device to the electrical connector via the electronics configured in the housing.

[0094] In some embodiments, the light generating system may include at least two light generating devices. Further, in some embodiments, the electronics may be configured to independently control the at least two light generating devices.

[0095] It may be advantageous to configure the electronics to independently control at least two light generating devices of an embodiment, as this may allow for easy incorporation into a multi-scene switching driver. The multi-scene switching driver may be configured to provide a low lumen output using only one of the at least two light generating devices. Additionally or alternatively, the multi-scene switching driver may be configured to provide a medium lumen output or a high lumen output using more than one of the at least two light generating devices. Furthermore, configuring the electronics to independently control at least two light generating devices of an embodiment may also benefit the light generation service life of the light generating system. When one of the one or more light generating devices fails, independent control of the electronics may ensure that the remaining light generating devices are still operable. Therefore, the light generating system is still able to generate at least some system light.

[0096] As indicated above, in some embodiments, the light generating system may include electronic devices. These electronic devices may be functionally coupled with the electrical connector. Further, in some embodiments, there may be an electrical connector between the electronic device and the light generating device. In particular, in some embodiments, there may be an electrical connector between the electronic device and a plurality of light generating devices. During operation, the electrical connector may provide a circuit for causing electrical energy to flow from an external electrical energy source to one or more light generating devices via the electrical connector and the electronic device. In some embodiments, the electronic device may be configured to control the light generating device. In a specific embodiment, the electronic device may be configured to (independently) control at least two light generating devices.

[0097] In some embodiments, the light generating system may include a light generating device. In particular, the light generating device may include an elongated printed circuit board (or "PCB"). Thus, in certain embodiments, the light generating system may include a light generating device, wherein the light generating device may include an elongated printed circuit board.

[0098] By means of the present system, a compact light generating system with low production costs can be provided, since the PCB can be provided at low cost. Another advantage provided by using a PCB as the light generating device may be that the PCB may be mounted directly to the housing by 3D printing of electronics. Furthermore, the PCB may also be more easily connected to an electrical connector by printing conductive traces using, for example, copper paste.

[0099] Hereinafter, some more specific embodiments of the system are described. In some embodiments, the board may include a rigid board or a semi-rigid board, in particular a rigid board. In other embodiments, the board may include a semi-rigid board. In other embodiments, the PCB is a flexible PCB.

[0100] In some embodiments, the light generating device may include an elongated LED filament. Because elongated LED filaments are very decorative, they are highly favored. Further, the LED filament may include multiple LED light sources. Further, in some embodiments, the multiple LED light sources may be encapsulated by an encapsulation. In some embodiments, the encapsulation may include a luminescent material. Therefore, in certain embodiments, a light generating system may include a light generating device, wherein the light generating device may include an LED filament; wherein the LED filament may include multiple LED light sources, wherein the multiple LED light sources may be encapsulated by an encapsulation, wherein the encapsulation may include a luminescent material. Because the LED filament may utilize more LED light sources with a low drive current, using the LED filament as the light generating device may provide the advantage of increased energy efficiency. Further, since the LED filament as the light generating device may be beneficial because it may be bendable, thereby allowing it to be incorporated into a stepped profile of a housing of the present system.

[0101] In some embodiments, the light generating device may include an elongated LED filament, which may include a plurality of LED light sources. In particular, the elongated LED filament may include a plurality of LED light sources connected in series. In some embodiments, the LED light sources may be colored LEDs. In some embodiments, the LED light sources may be LEDs selected from the group consisting of a blue LED, a red LED, a yellow LED, a green LED, an orange LED, a violet LED, and a cyan LED.

[0102] As indicated above, the package may include a luminescent material. In particular, the luminescent material may be configured to convert at least a portion of the LED light source light into luminescent material light. In some embodiments, together with the LED lamp, this may provide white light. In particular, in some embodiments, the luminescent material may include a luminescent material selected from the group consisting of red phosphors, orange phosphors, yellow phosphors, and green phosphors.

[0103] In some embodiments, the light generating device may include an LED strip. The LED strip may include multiple LEDs. The LED strip may be relatively flexible. In other embodiments, multiple LED strips may be used. For example, n LED strips may be used.

[0104] The light generating system may be, for example, part of or may be applied in an office lighting system, a home application system, a shop lighting system, a home lighting system, an accent lighting system, a spotlighting system, a theatre lighting system, a fibre optic application system, a projection system, a self-illuminating display system, a pixelated display system, a segmented display system, a warning sign system, a medical lighting application system, an indicator sign system, a decorative lighting system, a portable system, an automotive application, a (outdoor) road lighting system, a city lighting system, a greenhouse lighting system, a horticultural lighting, a digital projection or an LCD backlighting. The light generating system (or illuminator) may be, for example, part of or may be applied in an optical communication system or a disinfection system.

[0105] The terms "light" and "radiation" are used interchangeably herein, unless it is clear from the context that the term "light" refers only to visible light. Thus, the terms "light" and "radiation" may refer to UV radiation, visible light, and IR radiation. In certain embodiments, particularly for lighting applications, the terms "light" and "radiation" refer to (at least) visible light.

[0106] In yet another aspect, the present invention also provides a lamp or illuminator comprising a light generating system as defined herein. The lamp may also include a housing, an optical element, a shutter, etc. The lamp or illuminator may also include a housing enclosing the light generating system. The lamp or illuminator may include a light window or housing opening in the housing, through which the system light may escape from the housing. In yet another aspect, the present invention also provides a projection device comprising a light generating system as defined herein. In particular, a projection device or "projector" or "image projector" may be an optical device that projects an image (or moving image) onto a surface such as, for example, a projection screen. The projection device may include one or more light generating systems such as the light generating system described herein. Therefore, in one aspect, the present invention also provides a light generating device selected from the group of items: a lamp, an illuminator, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, the light generating device including a light generating system as defined herein. The light generating device may include a housing or a bracket, which is configured to accommodate or support one or more elements of the light generating system. For example, in some embodiments, a light generating device may include a housing or bracket configured to house or support one or more of the light sources.

[0107] The present invention also provides an arrangement of two or more lighting systems or an arrangement of two or more lighting devices, such as a grid of lamps or luminaires. Such a grid can be installed in a roof or ceiling. In some embodiments, the lighting devices can be functionally connected to a control system. In some embodiments, the lighting devices in the grid can include sensors, in particular one or more of radiation sensors and airflow sensors. In some embodiments, the lighting devices can adjust their settings based on one or more sensor signals of one or more lighting devices. In some embodiments, the lighting devices (in particular, their control systems) can communicate with each other. The lighting devices may include components for communicating with other units, systems or devices (such as on the basis of Bluetooth, WIFI, LiFi, ZigBee, BLE or WiMAX, or other wireless technologies). BRIEF DESCRIPTION OF THE DRAWINGS

[0108] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings, wherein corresponding reference numerals indicate corresponding parts, and wherein

[0109] Figure 1 to Figure 5 schematically depict embodiments and some general aspects of the present invention; and

[0110] Figure 6 Embodiments of applications are schematically depicted.

[0111] The schematic diagrams are not necessarily drawn to scale. DETAILED DESCRIPTION

[0112] Figure 1 An embodiment of the present invention is schematically depicted. In some embodiments, the present invention may be a light generating system 1000 including a housing 500 and a light generating device 100. In particular, the light generating device 100 may include an elongated support 150. The elongated support may be mechanically attached to the internal reflective surface. In addition, the elongated support 150 may have a support length L2, where 0.5≤L2 / L1≤l. It may also include a plurality of light sources 10. In particular, the light source may include a solid-state light source. In some embodiments, the light source 10 may be supported by the elongated support 150. In some embodiments, the light source 10 may be configured to generate light source light 11. Further, in some embodiments, the housing 500 may be thermally conductive. In particular, the housing 500 may include a thermally conductive material. More particularly, the thermal conductivity of the housing 500 may be selected from a range of ≥0.8W / (m*K). Further still, in some embodiments, the housing 500 may include an internal reflective surface 510. The light generating device 100 may be configured to be in physical contact with the internal reflective surface 510. In addition, assuming that the light source light 11 is irradiated vertically to the internal reflection surface 510, the reflection of the light source light 11 by the internal reflection surface 510 may be within the range of R ≥ 85%.

[0113] Further, the housing 500 may include a stepped profile 520 having n steps 521. More particularly, the stepped profile 520 may include n ≥ 2 steps 521. Further, in some embodiments, the n steps 521 may have a total step length L1. Further, in some embodiments, the inner reflective surface 510 may be reflective to the light source light 11. In some embodiments, the light generating device 100 may be mounted on at least a portion of the step length L1 on the stepped profile 520. Further, in some embodiments, the light generating device 100 may be configured to be in thermal contact with the housing 500.

[0114] Reference numeral 7 refers to the assembly of the housing 500 and the light generating device(s) and optionally a light transmissive window (see also below).

[0115] The light generating system 1000 may be configured to generate system light 1001 including the light source light 11. In particular, in some embodiments, at least a portion of the system light 1001 may include the light source light 11 reflected at the inner reflective surface 510 of the housing 500.

[0116] In some embodiments, the light generating device 100 may include a first end 105 and a second end 106. Further, the light generating system 1000 may include an electrical connector 1005 for connecting to an external electrical energy source. The first end 105 of the light generating device may be configured closer to the electrical connector 1005 than the second end 106.

[0117] Furthermore, Figure 1 (I) schematically depicts an embodiment of a light generating system 1000, wherein the step profile 520 may include concentrically arranged steps 521. The light generating system 1000 may also include at least two light generating devices 100. In some embodiments, the at least two light generating devices 100 may be mounted on at least two of the concentrically arranged steps 521. Figure 1 (II) schematically depicts another embodiment of the light generating system 1000 , wherein the step profile 520 may have a tapered spiral shape. Figure 1 (III) schematically depicts yet another embodiment of the light generating system 1000, wherein the stepped profile 520 may have a tapered spiral shape. In particular, wherein at least two light generating devices may be mounted on the tapered spiral shape in a double vortex (-like) configuration. Herein, two separate elongated supports 150 are distinguished by the markings 150' and 150". Note that such indications may also apply to the corresponding light generating device 100 (i.e., 100' and 100") and the corresponding second end 106 (i.e., 106' and 106"), however they are no longer separately indicated.

[0118] Figure 2 Another embodiment of the present invention is schematically depicted. In some embodiments, the present invention may be a light generating system 1000 including a housing 500 and a light generating device 100. In some embodiments, the housing 500 may include a first housing end 505 and a second housing end 506. Further, in some embodiments, the light generating system 1000 may include an electronic device 1050 configured in the housing 500. In particular, the light generating system 1000 may include an electrical connector 1060 between the electronic device 1050 and the light generating device 100. More particularly, in some embodiments, the electronic device 1050 may be connected to the light generating device 100 at a position 107 closer to the first end 105 than to the second end 106. Reference numeral 300 indicates a control system. Here, the electronic device 1050 may include a control system 300. However, this may also be the other way around. Further, the main control system may be configured outside the unit 7. Further, in some embodiments, the housing 500 may include a gap 530. Further, the gap 530 may include an electrical connector (1060). In some embodiments, the light generating system 1000 may include at least two light generating devices 100. Therefore, the electrical connector 1060 may be configured to electrically connect the at least two light generating devices 100. Further, in some embodiments, the light generating system 1000 may include an electronic device 1050. In particular, in some embodiments, the electronic device 1050 may be configured to independently control the at least two light generating devices 100.

[0119] Figure 2 (I) schematically depicts an embodiment of a light generating system 1000, wherein the step profile 520 may include steps 521 arranged in concentric circles. The light generating system 1000 may also include at least two light generating devices 100. In some embodiments, the at least two light generating devices 100 may be mounted on at least two of the concentrically arranged steps 521. Figure 2 (II) schematically depicts another embodiment of the light generating system 1000 , wherein the step profile 520 may have a tapered spiral shape.

[0120] Further, the lamp axis A1 may be an axis of the light generating system.

[0121] Figure 2 Embodiments of housing materials with variable wall thickness are also shown. Further, in some embodiments, the outside of the housing can hug the stepped profile of the inner reflective surface. Thus, in some embodiments, the outside of the housing can also include a stepped profile. However, as depicted herein in another embodiment, the outside of the housing can have a rounded cone shape.

[0122] Figure 3 Another embodiment of the present invention is schematically depicted. In particular, Figure 3 A cross section of a step profile 520 of the light generating system 1000 is depicted. In some embodiments, the present invention may be a light generating system 1000 comprising a light generating device 100 and an inner reflective surface 510. In some embodiments, the inner reflective surface 510 may comprise a step profile 520. In particular, the step profile 520 may comprise n≥2 steps 521. In some embodiments, the lamp axis A1 may be an axis of the light generating system 1000 (in particular, an assembly).

[0123] In some embodiments, at least one of the n steps 521 of the step profile 520 may be in a plane perpendicular to the lamp axis A1 (see (I)). Reference numeral W1 indicates the step width. In some embodiments, at least one of the n steps 521 of the step profile 520 may be inclined relative to the lamp axis A1 (see (II)). Here, the inclination angle α1 relative to the plane perpendicular to the lamp axis A1 is schematically depicted. Further, in some embodiments, at least one of the n steps 521 of the step profile 520 may have a parabolic shape (see (III)).

[0124] Figure 4 Another embodiment of the present invention is schematically depicted. In some embodiments, the present invention may be a light generating system 1000 including a light generating device 100. In some embodiments, the light generating device may include an elongated support 150. In particular, in some embodiments, the light generating device may include a printed circuit board 180. Further, in other embodiments, the light generating device 100 may include an elongated LED filament 250. Still further, the LED filament 250 may include a plurality of LED light sources 10. Further, in some embodiments, the plurality of LED light sources 10 may be encapsulated by an encapsulation 160. In some embodiments, the encapsulation 160 may include a luminescent material 200.

[0125] FIG5a schematically depicts another embodiment of the present invention. In some embodiments, the present invention may be a light generating system 1000 including a housing 500 and a light generating device 100. Further, in some embodiments, the light generating system 1000 may include an electronic device 1050 configured in the housing 500. In particular, the light generating system 1000 may include an electrical connector 1060 between the electronic device 1050 and the light generating device 100. Embodiments I and II show substantially the same embodiments, but with different aspects. Further, in some embodiments, the housing 500 may include a slit 530. Further, the slit 530 may include an electrical connector 1060. In some embodiments, the light generating system 1000 may include at least two light generating devices 100. Therefore, the electrical connector 1060 may be configured to electrically connect at least two light generating devices 100. Further, in some embodiments, the light generating system 1000 may include an electronic device 1050. In particular, in some embodiments, the electronic device 1050 may be configured to control at least two light generating devices 100 alone.

[0126] Fig. 5b schematically depicts two embodiments comprising a light-transmitting window 570. Such a window may be a closure of a housing. The window 570 may have a capsule shape, as schematically depicted on the right. The light-transmitting window may be transparent or translucent.

[0127] Fig. 5c schematically depicts a plurality of steps 521. The dashed line indicates the centre of the step and also the local diameter D. The (cumulative) length of the dashed line in the left embodiment or the length of the dashed line in the right embodiment may be the total step length L1.

[0128] Figure 6An embodiment of a lighting device 1200 is schematically depicted. In some embodiments, the lighting device 1200 may be selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, the lighting device 1200 comprising a lighting system 1000 as described herein. Reference numeral 301 indicates a user interface, which may be functionally coupled with a control system 300, which is included by the lighting system 1000 or functionally coupled to the lighting system 1000. The figure also schematically depicts an embodiment of a lamp 1 comprising the lighting system 1000. Reference numeral 3 indicates a projector device or a projector system, which may be used, for example, to project an image on a wall, which may also comprise the lighting system 1000. In some embodiments, such a lighting device may be a lamp, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Light of the lighting device escaping from the lighting device 1200 is indicated by reference numeral 1201. The lighting device light 1201 may be substantially composed of the system light 1001, and thus may be the system light 1001 in a particular embodiment. Reference numeral 1300 indicates a space such as an office or a living room, wherein reference numeral 1307 corresponds to a wall of the living room, reference numeral 1305 corresponds to a floor, and reference numeral 1310 corresponds to a ceiling. The luminaire 2 may include a plurality of lamp assemblies. The lamp 1 may include a single lamp assembly, or may be substantially a lamp assembly. In particular, the lamp 1 may include a spotlight (which may thus, for example, improve thermal performance).

[0129] The term "plurality" refers to two or more. Those skilled in the art will understand the terms "substantially" or "substantially" and similar terms herein. The terms "substantially" or "substantially" may also include embodiments with "entirely", "completely", "all", etc. Therefore, in some embodiments, the adjectives substantially or substantially may also be removed. Where applicable, the term "substantially" or the term "substantially" may also refer to 90% or higher, such as 95% or higher, in particular, 99% or higher, even more particularly, 99.5% or higher, including 100%. The term "comprising" also includes embodiments in which the term "comprising" means "consisting of..."

[0130] The term "and / or" specifically relates to one or more of the items mentioned before and after "and / or". For example, the 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 mean "consisting of" in one embodiment, but may also mean "including at least the defined substances and optionally one or more other substances" in another embodiment.

[0131] Furthermore, the terms first, second, third, etc. in the specification and in the claims are used to distinguish between similar elements and not necessarily to describe a sequential order or a chronological order. It should be understood that the terms so used are interchangeable under appropriate circumstances, and that the embodiments of the invention described herein are capable of operating in other sequences than those described or illustrated herein.

[0132] An apparatus, device or system may be described herein particularly during operation. As will be clear to one skilled in the art, the present invention is not limited to methods of operation or apparatus, devices or systems while in operation.

[0133] 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.

[0134] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0135] Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Throughout the specification and claims, the words "comprise," "comprising," and the like are to be interpreted in an inclusive sense rather than an exclusive or exhaustive sense (that is, in the sense of "including but not limited to"), unless the context clearly requires otherwise.

[0136] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0137] The invention can be implemented by means of hardware comprising several distinct elements and by means of a suitably programmed computer. In a device claim, an apparatus claim or a system claim enumerating several means, several of these means may be embodied by the same item of hardware. The mere fact that certain measures are listed in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. In yet another aspect, the invention (therefore) provides a software product which, when run on a computer, is capable of implementing (one or more embodiments of) the method as described herein.

[0138] The present invention also provides a control system that can control a device, apparatus or system, or can implement the method or process described herein. Still further, the present invention also provides a computer program product that, when running on a computer (the computer is functionally coupled to or included in the device, apparatus or system), controls one or more controllable elements of such a device, apparatus or system.

[0139] The present invention also applies to a device, apparatus or system comprising one or more of the characterizing features described in the specification and / or shown in the drawings. The present invention also relates to a method or process comprising one or more of the characterizing features described in the specification and / or shown in the drawings.

[0140] The various aspects discussed in this patent may be combined to provide additional advantages. Further, those skilled in the art will appreciate that the embodiments may be combined, and more than two embodiments may also be combined. Still further, some of the features may form the basis for one or more divisional applications.

Claims

1. A lighting device (1200) selected from the group consisting of a lamp (1) and a luminaire (2), comprising a light generating system (1000), the light generating system (1000) comprising a housing (500) and a light generating device (100), wherein: The light generating device (100) comprises an elongated support (150) and a plurality of light sources (10), wherein the light sources (10) comprise solid-state light sources; wherein the light sources (10) are supported by the elongated support (150); wherein the light sources are configured to generate light source light (11); The housing (500) is thermally conductive; wherein the housing (500) comprises an inner reflective surface (510), wherein the inner reflective surface comprises a stepped profile (520) having n steps (521), wherein n≥2; wherein the n steps have a step length L1; wherein the inner reflective surface (510) is reflective to the light source light (11); and The light generating device (100) is mounted on at least a portion of the step length L1 on the step profile (520) and is configured to be in thermal contact with the housing (500); wherein the light generating device (100) is configured to be in physical contact with the internal reflective surface (510); wherein the housing (500) comprises a thermally conductive material; wherein the elongated support member (150) has a support member length L2, wherein 0.5≤L2 / L1≤l; and wherein the thermal conductivity of the housing is selected from the range of ≥0.8 W / (m*K); wherein the stepped profile (520) has a tapered spiral shape; The light generating device (100) comprises an elongated LED filament (250), wherein the LED filament (250) comprises a plurality of LED light sources (10) encapsulated by an encapsulation body (160) comprising a luminescent material (200).

2. The lighting device (1200) according to claim 1, wherein n is selected from the range of 3 to 6.

3. The lighting device (1200) according to any one of the preceding claims, wherein the elongated support (150) is mechanically attached to the inner reflective surface (510).

4. The lighting device (1200) according to any one of the preceding claims, wherein, assuming that the light source light (11) irradiates the internal reflection surface (510) vertically, the reflection of the light source light (11) by the internal reflection surface (510) is in the range of R ≥ 85%.

5. The lighting device (1200) according to any of the preceding claims, wherein at least one of the steps (521) of the step profile (520) is inclined relative to a lamp axis (A1) of the light generating system (1000).

6. The lighting device (1200) according to any of the preceding claims, wherein at least one of the steps (521) of the step profile (520) is in a plane perpendicular to a lamp axis (A1) of the light generating system (1000).

7. The lighting device (1200) according to any of the preceding claims, wherein at least one of the steps (521) has a parabolic shape.

8. The lighting device (1200) according to any of the preceding claims, wherein the housing comprises metal.

9. A lighting device (1200) according to any one of the preceding claims, wherein the light generating device (100) comprises a first end (105) and a second end (106); wherein the light generating system (1000) comprises an electrical connector (1005) for connecting to an external electrical energy source, wherein the first end (105) is configured to be closer to the electrical connector than the second end (106); wherein the light generating system (1000) comprises an electronic device (1050) configured in the housing (500); wherein the light generating system (1000) further comprises an electrical connector (1060) between the electronic device (1050) and the light generating device (100), wherein the electrical connector (1060) is connected to the light generating device (100) at a position (107) closer to the first end (105) than the second end (106).

10. The lighting device (1200) according to any one of the preceding claims 1 to 7, wherein the step profile comprises concentrically arranged steps (521); wherein the light generating system (1000) comprises at least two light generating devices (100) mounted on at least two concentrically arranged steps among the concentrically arranged steps (521).

11. The lighting device (1200) according to claim 9, wherein the light generating system (1000) comprises an electronic device (1050) according to claim 9 configured in the housing (500); wherein the housing (500) comprises a gap (530), wherein the gap (530) comprises an electrical connector (1060) according to claim 9; wherein the electrical connector (1060) is configured to electrically connect the at least two light generating devices (100).

12. The lighting device (1200) according to any of the preceding claims 10 to 11, wherein the electronics (1050) are configured to independently control the at least two light generating devices (100).

13. The lighting device (1200) according to any of the preceding claims, wherein the light generating device (100) comprises an elongated printed circuit board (180).

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