Luminaire comprising a combination of a cob LED strip and a LED filament

Abstract

The invention provides a light generating system (1000) comprising a LED strip (400) and a LED filament (500), wherein: (A) the LED strip (400) comprises a first axis of elongation (A1) and has a first length (L1); wherein the LED strip (400) is configured to generate a first beam (4) of first device light (401); wherein at least 90% of a spectral power of the first device light (401) is in an angular range of 0-180° around the first axis of elongation (A1), with a non-zero light intensity over the entire range of 20-160°; (B) the LED filament (500) comprises a second axis of elongation (A2) and has a second length (L2); wherein the LED filament (500) is configured to generate a second beam (5) of second device light (501) with a non-zero light intensity over the entire range of 30-150° and 210-330° around the second axis of elongation (A2); and (C) a first end portion (4001) of the LED strip (400) is physically coupled to a second point (P2) along the second length (L2) of the LED filament (500), or a second end portion (5001) of the LED filament (500) is physically coupled to a first point (P1) along the first length (L1) of the LED strip (400).

Description

[0001] Luminaire comprising a combination of a CoB LED strip and a LED filament

[0002] FIELD OF THE INVENTION

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

[0004] BACKGROUND OF THE INVENTION

[0005] Light generating systems are known in the art. US2022221113A1, for instance, describes a solid state lamp comprising: (A) a plurality of flexible strips encapsulating bare, unpackaged light emitting diode (LED) dies, the bare, unpackaged LED dies being connected in series in the flexible strips, wherein the flexible strips are connected at one or more first terminals to a first voltage and connected at one or more second terminals to a second voltage; (B) a support structure for supporting the flexible strips; (C) an electrical connector affixed to the support structure for connection to an external power source for providing drive current to the strips; and (D) wherein the flexible strips or the support structure comprise one or more folds configured to allow the flexible strips or the support structure to extend or contract along a longitudinal direction and correspondingly decrease or increase a dimension of the solid state lamp in a transverse direction orthogonal to the longitudinal direction, where an illumination profile produced by the solid state lamp varies depending on the dimension of the solid state lamp.

[0006] SUMMARY OF THE INVENTION

[0007] Conventional light generating systems (e.g. incandescent or fluorescent lamps) are rapidly being replaced by light emitting diode (LED) based lighting solutions. LED-based lighting solutions (such as LED filaments) may be used to replace conventional filaments in light bulbs, wherein the LED filament may need to provide light in all directions. Yet, in luminaires, the light source may be attached to an opaque surface (such as a luminaire housing), wherein emission of light in all directions may lead to a drop in efficiency, as light emitted towards the opaque surface is absorbed and converted into heat. Further, a light source emitting in all directions may be more difficult to mount. At the same time, the use of an omnidirectional light source in a luminaire may provide decorative effects, especially when such a light source is visible from multiple angles around the luminaire. As such, there is a desire for light generating systems that may especially be efficient, easy to mount, and provide decorative effects. Hence, it is an aspect of the invention to provide an alternative light generating system, which preferably further at least partly obviates one or more of above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0008] According to a first aspect, the invention provides a light generating system (“system”) comprising a LED strip and a LED filament. The LED strip may comprise a first axis of elongation (Ai). Further, the LED strip may have a first length (Li) (along the first axis of elongation (Ai)). The LED strip may be configured to generate a first beam of first device light. At least 90% of a spectral power of the first device light may be in an angular range of 0-180° around the first axis of elongation (Ai). Further, the first device light may have a non-zero light intensity over the entire range of 30-150° (around the first axis of elongation (Ai)). The LED filament may comprise a second axis of elongation (A2). Additionally, the LED filament may have a second length (L2) (along the second axis of elongation (A2)). The LED filament may be configured to generate a second beam of second device light. At least 90% of a spectral power of the second device light may be in an angular range of 0-330°, such as an angular range of 0-360°, around the second axis of elongation (A2). Especially, the second device light may have a non-zero light intensity over the entire range of 30-150° around the second axis of elongation (A2). Additionally, the second device light may have a non-zero light intensity over the entire range of 210-330° around the second axis of elongation (A2). A first end portion of the LED strip may be physically coupled to a second point (P2) along the second length (L2) of the LED filament. Alternatively, a second end portion of the LED filament may be physically coupled to a first point (Pi) along the first length (Li) of the LED strip. Hence, in specific embodiments, the invention provides a light generating system comprising a LED strip and a LED filament, wherein: (A) the LED strip comprises a first axis of elongation (Ai) and has a first length (Li); wherein the LED strip is configured to generate a first beam of first device light; wherein at least 90% of a spectral power of the first device light is in an angular range of 0-180° around the first axis of elongation (Ai), with a non-zero light intensity over the entire range of 30-150°; (B) the LED filament comprises a second axis of elongation (A2) and has a second length (L2); wherein the LED filament is configured to generate a second beam of second device light with a nonzero light intensity over the entire range of 30-150° and 210-330° around the second axis of elongation (A2); and (C) a first end portion of the LED strip is physically coupled to a second point (P2) along the second length (L2) of the LED filament, or a second end portion of the LED filament is physically coupled to a first point (Pi) along the first length (Li) of the LED strip.

[0009] Such a light generating system may comprise both a decorative LED filament mainly providing device light in a wide angular range (> 300°) around the LED filament, and a LED strip mainly providing device light in a narrower angular range (< 180°) around the LED strip for improved energy efficiency after mounting on an opaque surface. Further, the LED strip may provide ease of mounting and thermal management, as the “dark” side of the LED strip may comprise a relatively flat and thermally conductive surface, which may optionally be fixated to a surface (of a thermally conductive element) using a fixating element.

[0010] The light generating system may comprise a LED strip and a LED filament. The LED strip may especially be a first elongated light generating device. Further, the LED filament may especially be a second elongated light generating device. Hence, the LED strip and LED filament may each comprise a respective first and second axis of elongation, along which the LED strip and LED filament, respectively, may be elongated. Some general embodiments relating to the LED strip and LED filament are provided below.

[0011] In general, the LED strip and LED filament may each comprise (i) a (respectively first or second) elongated carrier along the (respective first or second) axis of elongation, (ii) a (respectively first or second) array of a plurality of (respectively first or second) solid state light sources on the (respective first or second) elongated carrier, and (iii) a (respectively first or second) elongated encapsulant enclosing the (respective first or second) plurality of solid state light sources and at least part of the (respective first or second) elongated carrier. In embodiments, the LED strip may have a first length Li along the first axis of elongation AL Similarly, the LED filament may have a second length L2 along the second axis of elongation A2. The second length L2 may be equal to the first length Li (i.e. Li = L2). Alternatively, the second length L2 may be larger than the first length Li, such that L1 / L2 < 1, especially L1 / L2 < 0.8, like L1 / L2 < 0.6. Alternatively, the second length L2 may be equal to or smaller than the first length Li, such as L1 / L2 > 1, especially L1 / L2 > 1.2, like L1 / L2 > 1.4. Hence, in specific embodiments, L1 / L2 < 0.8 or L1 / L2 > 1.2. Embodiments wherein L1 / L2 < 0.8 may facilitate that the light generating system may comprise relatively more of the decorative LED filament providing mainly light in a wide (> 300°) angular range. Conversely, embodiments wherein L1 / L2 > 1.2 may facilitate that a relatively larger portion of the light generating system may be used for mounting of the light generating system to a surface. In embodiments, Li and L2 may be individually selected from the range of > 2 cm, such as from the range of > 5 cm, especially from the range of > 10 cm. Additionally or alternatively, Li and L2 may be individually selected from the range of < 50 cm, such as from the range of < 40 cm, especially from the range of < 30 cm.

[0012] The LED strip may have a first end portion, and the LED filament may have a second end portion. Looking along the first (and / or second) axis of elongation (Ai and / or A2), the first (and / or second) end portion may especially be configured at 0*Lk - 0. l*Lk or 0.9*Lk - Lk, wherein the subscript k indicates 1 or 2. Hence, the first (and / or second) end portion may be the first or last 10% of the LED strip (and / or LED filament). Further, the first (and / or second) end portion may comprise at least part of an edge of the first (and / or second) elongated carrier (see below). The first end portion may be physically coupled to a second point (P2) along the second length (L2) of the LED filament. The second point (P2) may be configured (looking along the second axis of elongation (A2)) at xl*L2. In embodiments, xl may be selected from the range of 0.05-0.95, such as from the range of 0.1-0.9, especially from the range of 0.2-0.8. Alternatively, the second end portion may be physically coupled to a first point (Pi) along the first length (Li) of the LED strip. The first point (Pi) may be configured (looking along the first axis of elongation (Ai)) at x2*Li. In embodiments, x2 may be selected from the range of 0.05-0.95, such as from the range of 0.1-0.9, especially from the range of 0.2-0.8. Alternatively, the first end portion may be physically coupled to the second end portion. Hence, in specific embodiments, one of the following may apply: (a) the first end portion may be physically coupled to the second end portion; (b) the second point (P2) is configured at xl*L2, wherein xl may be selected from the range of 0.1-0.9; and (c) the first point (Pi) is configured at x2*Li, wherein x2 may be selected from the range of 0.1-0.9. Especially, the LED strip and LED filament may thus be configured physically coupled at any location along the LED strip and / or LED filament, thereby providing flexibility in altering the structure and / or design of the light generating system.

[0013] The LED strip and LED filament may further have a first and second width Wi and W2, respectively, and a first and second height Hi and H2, respectively, wherein the width W and height H may be perpendicular to each other and the respective length L. The LED strip and / or LED filament may have a relatively high aspect ratio, such as 10*Wk< Lk and / or 10*Hk< Lk, wherein the subscript k indicates 1 or 2. Additionally or alternatively, in embodiments, Lk< 900*Wk and / or Lk< 900*Hk, wherein the subscript k indicates 1 or 2. Hence, the LED strip and / or LED filament may be elongated light generating devices. In some embodiments, the LED strip and / or LED filament may be straight. In other embodiments, the LED strip and / or LED filament may be curved. The LED strip may be curved out of a plane parallel to the first (and / or second) major surface of a first elongated carrier (see below). Further, the LED filament may be curved out of and / or (with)in a plane parallel to the first (and / or second) major surface of a second elongated carrier (see below). In specific embodiments, especially the LED filament may have a (2D or 3D) spiraling shape, (like) a helical shape. The first axis of elongation Ai and second axis of elongation A2 may follow the shape of the LED strip and LED filament, respectively. Hence, in embodiments, the first and / or second axis of elongation may be curved. Especially, the first and second axis of elongation may be based on a connection of the geometrical centers of infinitely thin slices of the LED strip and LED filament, respectively, taken along a direction perpendicular to the respective width W and height H of the LED strip and LED filament.

[0014] As indicated, the LED strip and LED filament may comprise a first elongated carrier and a second elongated carrier, respectively, and a respective first array and second array of a plurality of respective first solid state light sources and second solid state light sources arranged on the respective elongated carrier. Especially, the first elongated carrier and second elongated carrier may be configured to support the first solid state light sources and second solid state light sources, respectively. Further, the (first and / or second) elongated carrier may e.g. comprise glass, quartz, metal, or sapphire. In other embodiments, the (first and / or second) elongated carrier may e.g. comprise a polymeric material or (flexible) metal, e.g., a film or foil. The (first and / or second) elongated carrier may be rigid (self-supporting), but may (in polymeric embodiments) also be flexible. Hence, in specific embodiments, one or more of the first elongated carrier and the second elongated carrier may be flexible. Especially, in specific embodiments, one of the first elongated carrier and the second elongated carrier may be flexible, and the other of the first elongated carrier and the second elongated carrier may be rigid. A flexible carrier may facilitate that the LED strip and / or LED filament may be bent and / or twisted into a plurality of configurations, allowing customization of the appearance of the light generating system. Further, a rigid carrier may provide sturdiness to the light generating system.

[0015] The (first and / or second) elongated carrier may be light transmissive, translucent, or transparent for light, especially visible light. Especially, the second elongated carrier may be light transmissive, such as especially light transmissive for at least part of a spectral wavelength range of the second device light. Alternatively, in embodiments, the (first and / or second) elongated carrier may be opaque, such as especially opaque for visible light, and / or such as especially opaque for at least part of a spectral wavelength range of one or more of the first device light and the second device light. Hence, in specific embodiments, the first elongated carrier may be opaque for at least part of a spectral wavelength range of the first device light. An opaque first elongated carrier may facilitate providing at least 90% of the first device light in an angular range of 0-180°, especially without the need for reflective coatings. Further, the second elongated carrier may be opaque for at least part of a spectral wavelength range of the second device light, and the second array of the plurality of second solid state light sources may be configured on both a first and second major surface of the second elongated carrier (see below). Such a configuration may provide a more even intensity distribution of the second device light around the second elongated carrier. Alternatively, the second elongated carrier may be light transmissive, and the second array of the plurality of second solid state light sources may be configured on one or more of the first and second major surface of the second elongated carrier. Such a configuration may reduce the number of second solid state light sources needed to provide a non-zero light intensity over the entire range of 30-150° and 210-330°, thereby reducing the energy consumption of the light generating system. Additionally or alternatively, in embodiments, the (first and / or second) elongated carrier may be light reflective, such as especially reflective for the (first and / or second) device light. In specific embodiments, the (first and / or second) carrier may be diffuse reflective. In embodiments wherein the first elongated carrier is light transmissive, the first elongated carrier may especially comprise a reflective coating on the first elongated carrier. The (each of the first and second) (elongated) carrier may comprise a first major surface at a first side of the (respective first or second) carrier and a second major surface at a second side of the (respective first or second) carrier, opposite to the first side. The plurality of (first and / or second) solid state light sources may be arranged on at least one of these surfaces (of the respective first and / or second carrier). Hence, in embodiments, at least part of, such as all of, the (first and / or second) solid state light sources may be mounted onto the first major surface (of the respective first and / or second carrier). Especially, for the LED strip, all of (the first array of) the plurality of first solid state light sources may be configured (especially mounted) on the first major surface of the first elongated carrier. Additionally or alternatively, at least part of the (first and / or second) solid state light sources may be mounted onto the second major surface (of the respective first and / or second carrier). Especially, for the LED filament, (the second array of) the plurality of second solid state light sources may be configured (especially mounted) on at least the first major surface of the second elongated carrier. Hence, in specific embodiments, for the LED filament, the plurality of second solid state light sources may be partially configured on the first major surface, and partially configured on the second major surface of the second elongated carrier. Especially, the second array of the plurality of second solid state light sources may comprise a first subarray configured on the first major surface and a second subarray configured on the second major surface of the second elongated carrier. The solid state light sources may be arranged, mounted and / or mechanically coupled on / to the carrier, wherein the carrier may especially be configured to mechanically and / or electrically support the solid state light sources. Further, in embodiments, the LED strip (and / or LED filament) may comprise a chip-on-board (COB) device. The term “COB” especially refers to LED chips (e.g. the first solid state light sources) in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, in specific embodiments, the LED strip may comprise a chip-on-board device, wherein the chip-on-board device may comprise the plurality of first solid state light sources. Such a COB system may facilitate providing a larger number of light sources on the same surface area of the carrier. Hence, a COD system may especially be compact.

[0016] The (first and / or second) solid state light sources may comprise LEDs. Especially, the first solid state light sources may comprise LEDs, and the second solid state light sources may comprise LEDs. Alternatively or additionally, the solid state light sources may comprise laser diodes. Further, the LED strip and / or LED filament may comprise one or more of LEDs, laser diodes, superluminescent diodes, and multi -junction light emitting diodes. The (plurality of) (first and / or second) solid state light sources may be arranged in an array (on the respective first and / or second elongated carrier). The number of (first and / or second) solid state light sources in the array may be > 4, such as > 8, especially > 12. Especially, in embodiments, the number of (first and / or second) solid state light sources in the array may be selected from the range of 10-2000, such as from the range of 10-1500, especially from the range of 10-1000. The (first and / or second) solid state light sources may be configured in a ID (linear) array. Further, in embodiments, the second solid state light sources may be configured in two ID arrays, one on the first major surface of the second elongated carrier and one on the second major surface. A 2D array of (first and / or second) solid state light sources of n*m LEDs may also be possible. The number of rows (n) may be selected from the range of 1-4, such as 1-3, like 1-2, and the number of (first and / or second) solid state light sources in the respective rows (m) may be selected from the range of > n, such as from the range of > 4 (when n<4), like > 6, such as > 8. In embodiments, n / m < 0.2, like n / m < 0.1, especially n / m < 0.05. The LED strip and LED filament may comprise a first encapsulant and second encapsulant, respectively. The (first and / or second) encapsulant may especially (at least partly) cover (such as at least partially enclose) the plurality of (first and / or second) solid state light sources. Further, the (first and / or second) encapsulant may cover at least part of the (first and / or second) elongated carrier, such as at least (part of) one of the first major and second major surface. In general, the (first and / or second) encapsulant may be in contact with the (first and / or second) elongated carrier and may (at least partially) enclose all of the (first and / or second) solid state light sources. The (first and / or second) encapsulant may be a continuous coating along the respective length L of the LED strip and / or LED filament, at one or both of the first major and the second major surface. Further, the (first and / or second) encapsulant may cover (such as at least partially enclose) > 50% of the total number of (first and / or second) solid state light sources in the array, such as > 75%, especially > 95%, up to 100%. Especially, the first elongated encapsulant (of the LED strip) may at least partially enclose (all of) the plurality of first solid state light sources and at least partially cover (only) the first major surface of the first elongated carrier. Additionally or alternatively, in embodiments, the second elongated encapsulant (of the LED filament) may at least partially enclose (all of) the plurality of second solid state light sources and at least partially cover the first major surface and at least part of the second major surface of the second elongated carrier. Hence, in specific embodiments, (A) the LED strip may comprise (i) a first elongated carrier along the first axis of elongation (Ai), (ii) a first array of a plurality of first solid state light sources on a first major surface of the first elongated carrier, and (iii) a first elongated encapsulant at least partially enclosing the plurality of first solid state light sources and at least partially covering the first major surface of the first elongated carrier; and (B) the LED filament may comprise (i) a second elongated carrier along the second axis of elongation (A2), (ii) a second array of a plurality of second solid state light sources on at least a first major surface of the second elongated carrier, and (iii) a second elongated encapsulant at least partially enclosing the plurality of second solid state light sources and at least partially covering the first major surface and at least part of a second major surface of the second elongated carrier; wherein one or more may apply of: (a) the second elongated carrier may be light transmissive for at least part of a spectral wavelength range of the second device light; and (b) the second array of the plurality of second solid state light sources may be partially configured on the second major surface of the second elongated carrier. A LED filament comprising a light transmissive carrier may facilitate the second beam of second device light having a non-zero light intensity over the entire range of 30-150° and 210-330° around the second axis of elongation (A2). Additionally or alternatively, a LED filament wherein the second solid state light sources are provided on the first and second major surface of the second elongated carrier may provide a more even intensity of the second device light around the LED filament.

[0017] The first (and / or second) encapsulant may comprise at least one of a first (and / or second) luminescent material and a first (and / or second) light scattering material. Examples of suitable luminescent materials are provided below, though any luminescent material known in the art may be used. The invention is thus not limited to the examples of luminescent materials provided herein. The at least one of the first (and / or second) luminescent material and the first (and / or second) light scattering material may especially be configured embedded in a first (and / or second) encapsulant material, e.g. a (flexible) polymer material (such as a silicone). The first (and / or second) luminescent material may be configured to convert at least part, such as all, of a first (and / or second) light source light (generated by the first (and / or second) solid state light sources) into first (and / or second) luminescent material light. The first and second luminescent material may be the same (type of) luminescent material, or may be different (types of) luminescent material(s). Further, in specific embodiments, at least one of the first elongated encapsulant and the second elongated encapsulant may comprise a luminescent material. The first (and / or second) luminescent material may comprise a phosphor (such as an inorganic phosphor) and / or quantum dots or rods. Further, the first (and / or second) luminescent material may comprise one or more luminescent materials. In embodiments, the second encapsulant configured on the first major surface and the second encapsulant configured on the second major surface of the second elongated carrier may comprise a different (type and / or concentration of) luminescent material, providing luminescent material light having different spectral power distributions and / or intensities. Further, in embodiments, the first (and / or second) light scattering material may be configured to scatter (or “diffuse”) at least part of the first (and / or second) light source light into scattered first (and / or second) light source light(, especially in a direction transverse to a normal of the first (and / or second) major surface). In specific embodiments, the first (and / or second) light scattering material may comprise light scattering particles, such as e.g. at least one of BaSCL, A12O3 and TiCh particles. Further, in embodiments, the second encapsulant configured on the first major surface and the second encapsulant configured on the second major surface of the second elongated carrier may differ in one or more of: (a) the type of and / or concentration of second luminescent material (and thus the luminescent material light provided by the respective encapsulants), and (b) the type of and / or concentration of second light scattering material.

[0018] The first and second solid state light sources, comprised by the LED strip and LED filament, respectively, may be configured to generate respectively first and second light source light. In embodiments, at least two of the (first and / or second) solid state light sources may be configured to emit (first and / or second) light source light having different spectral power distributions. In other embodiments, at least two, such as all, of the (first and / or second) solid state light sources may be configured to provide (first and / or second) light source light having essentially the same spectral power distribution. Hence, solid state light sources comprised by the LED strip may provide light source light having either a same of a different spectral power distribution. Further, solid state light sources comprised by the LED filament may provide light source light having either a same of a different spectral power distribution. Especially, in embodiments, second solid state light sources in the first subarray may be configured to generate second light source light having the same or a different spectral power distribution as second light source light generated by second solid state light sources in the second subarray.

[0019] Hence, in embodiments, the first device light and second device light may have the same spectral power distribution. In such embodiments, the first light source light may have the same spectral power distribution as the second light source light, and the first luminescent material light may have the same spectral power distribution as the second luminescent material light.

[0020] In embodiments, the first luminescent material may comprise one or more luminescent materials of the same or a different type. Similarly, the second luminescent material may comprise one or more luminescent materials of the same or a different type.

[0021] The plurality of first solid state light sources may all be the same, or at least two of the plurality of first solid state light sources may differ (from each other). Similarly, the plurality of second solid state light sources may all be the same, or at least two of the plurality of second solid state light sources may differ (from each other).

[0022] In (other) embodiments, the first device light may have a different spectral power distribution than the second device light. Especially, one or more may apply of: (a) the first light source light may have a different spectral power distribution than the second light source light, and (b) the first luminescent material light may have a different spectral power distribution than the second luminescent material light. A difference in (spectral power distribution of) the first device light and second device light may be facilitated by selecting different light sources for the LED strip and LED filament, or by selecting a different composition of (the same types of) light sources for the LED strip and LED filament. Similarly, a difference in (spectral power distribution of) the first luminescent material light and second luminescent material light may be facilitated by selecting different luminescent materials for the LED strip and LED filament, or by selecting a different composition of (the same types of) luminescent materials for the LED strip and LED filament.

[0023] As indicated above, the first elongated encapsulant may comprise at least one of a first luminescent material and a first light scattering material, and the second elongated encapsulant may comprise at least one of a second luminescent material and a second light scattering material. The first (and / or second) luminescent material may be configured to convert at least part of the first (and / or second) light source light received by the first (and / or second) elongated encapsulant into first (and / or second) luminescent material light. Additionally or alternatively, the first (and / or second) light scattering material may be configured to scatter at least part of the first (and / or second) light source light received by the first (and / or second) elongated encapsulant into scattered first (and / or second) light source light. The first (and / or second) device light may comprise one or more of the first (and / or second) luminescent material light and the scattered first (and / or second) light source light. Hence, in specific embodiments, the plurality of first solid state light sources may be configured to generate first light source light, wherein the first solid state light sources may comprise LEDs, and the first elongated encapsulant may comprise at least one of (i) a first luminescent material configured to convert at least part of the first light source light received by the first elongated encapsulant into first luminescent material light, and (ii) a first light scattering material configured to scatter at least part of the first light source light received by the first elongated encapsulant into scattered first light source light; wherein the first device light may comprise one or more of the first luminescent material light and the scattered first light source light. Such a first elongated encapsulant may facilitate providing diffuse first device light. Further, such a first elongated encapsulant may facilitate converting e.g. blue light source light into (luminescent material) light of a different color. This may be more energy-efficient than directly providing said colored light.

[0024] Further, in specific embodiments, the plurality of second solid state light sources may be configured to generate second light source light, wherein the second solid state light sources may comprise LEDs, and the second elongated encapsulant may comprise at least one of (i) a second luminescent material configured to convert at least part of the second light source light received by the second elongated encapsulant into second luminescent material light, and (ii) a second light scattering material configured to scatter at least part of the second light source light received by the second elongated encapsulant into scattered second light source light; wherein the second device light may comprise one or more of the second luminescent material light and the scattered second light source light. Such a second elongated encapsulant may facilitate providing diffuse second device light. Further, such a second elongated encapsulant may facilitate converting e.g. blue light source light into (luminescent material) light of a different color. This may be more energy-efficient than directly providing said colored light.

[0025] The LED strip may thus be configured to generate first device light, such as especially a first beam of first device light. In embodiments, at least 70%, such as at least 80%, especially at least 90%, including (essentially) 100%, of a spectral power (and / or radiant flux) of the (first beam of) first device light may be in a (first) angular range around the first axis of elongation (Ai). The (first) angular range may especially be selected from the range of 0-160°, such as from the range of 0-180°, especially from the range of 0-200°. In embodiments, the angular range may be determined in a cross-section of the LED strip perpendicular to the first axis of elongation (Ai), wherein a (center of a) first side face of the first elongated carrier (bridging the first and second major surfaces) may denote both 0° and 360°, and wherein a (center of a) second opposite side face of the first elongated carrier may denote 180°. In such embodiments, the angular range of 0-180° may especially be configured on a side of the first major surface, and an angular range of 180-360° may especially be configured on a side of the second major surface. In specific embodiments, at least 90% of a spectral power of the first device light may be in an angular range of 0-160°, such as in an angular range of 0-180°, especially in an angular range of 0-200°, around the first axis of elongation (Ai) (i.e., a majority of the spectral power of the first device light may originate from a side of the first major surface of the first elongated carrier). Especially, in embodiments, at least 98%, such as (essentially) 100%, of a spectral power of the first device light may be in an angular range of 0-180° around the first axis of elongation (Ai). Further, the first device light may have a non-zero light intensity over the entire range of 40-140°, such as the entire range of 30-150°, especially the entire range of 20-160° (in the first angular range). That is, at every angle in the range of 40-140°, such as the range of 30-150°, especially the range of 20-160°, around the first axis of elongation (Ai), the first device light may have at least some intensity (or radiant flux). Hence, looking along the first axis of elongation Ai, the LED strip may be configured to provide first device light over a circle section, or (essentially) a half circle, around the first axis of elongation Ai. Similarly, the LED filament may be configured to generate a second beam of second device light. In embodiments, at least 70%, such as at least 80%, especially at least 90%, including (essentially) 100%, of a spectral power (and / or radiant flux) of the (second beam of) second device light may be in a (second) angular range around the second axis of elongation (A2). The (second) angular range may especially be selected from the range of 0- 300°, such as from the range of 0-330°, especially from the range of 0-360°. In embodiments, the angular range may be determined in a cross-section of the LED filament perpendicular to the second axis of elongation (A2), wherein a (center of a) first side face of the second elongated carrier (bridging the first and second major surfaces) may denote both 0° and 360°, and wherein a (center of a) second opposite side face of the second elongated carrier may denote 180°. In such embodiments, the angular range of 0-180° may especially be configured on a side of the first major surface, and an angular range of 180-360° may especially be configured on a side of the second major surface. In specific embodiments, at least 90% of a spectral power of the second device light may be in an angular range of 0-300°, such as in an angular range of 0-330°, especially in an angular range of 0-360°, around the second axis of elongation (A2). Further, the second device light may have a non-zero light intensity over the entire range of 40-140°, such as the entire range of 30-150°, especially the entire range of 20- 160° (in the second angular range). That is, at every angle in the range of 40-140°, such as the range of 30-150°, especially the range of 20-160°, around the second axis of elongation (A2), the second device light may have at least some intensity (or radiant flux). Especially, at least 10%, such as at least 20%, especially at least 30%, of a spectral power of the second device light may be in the (angular) range of 40-140°, such as the range of 30-150°, especially the range of 20-160°, around the second axis of elongation (A2). Additionally, the second device light may have a non-zero light intensity over the entire range of 220-320°, such as the entire range of 210-330°, especially the entire range of 200-340° (in the second angular range). That is, at every angle in the range of 220-320°, such as the range of 210- 330°, especially the range of 200-340°, around the second axis of elongation (A2), the second device light may have at least some intensity (or radiant flux). Especially, at least 10%, such as at least 20%, especially at least 30%, of a spectral power of the second device light may be in the (angular) range of 220-320°, such as the range of 210-330°, especially the range of 200-340°, around the second axis of elongation (A2). Hence, in specific embodiments, at least 20% of a spectral power of the second device light may be in the angular range of 30-150°, and at least 20% of the spectral power may be in the angular range of 210-330°, with a nonzero light intensity over the entire range of 30-150° and 210-330°. In embodiments, the LED filament may comprise solid state light sources on (only) the first major surface of the second elongated carrier, wherein the second elongated carrier may be light transmissive, and wherein at least 50% of a spectral power of the second device light may be in the angular range of 30-150°, and at least 10% of the spectral power may be in the angular range of 210- 330°, with a non-zero light intensity over the entire range of 30-150° and 210-330°. Alternatively, the LED filament may comprise solid state light sources on (both) the first major surface and the second major surface of the second elongated carrier, wherein the second elongated carrier may be light transmissive or opaque, and wherein at least 30% of a spectral power of the second device light may be in the angular range of 30-150°, and at least 30% of the spectral power may be in the angular range of 210-330°, with a non-zero light intensity over the entire range of 30-150° and 210-330°. Further, at least 70%, such as at least 80%, especially at least 90%, of a spectral power of the second device light may be in the angular ranges of 30-150° and 210-330°. Additionally or alternatively, at most 98%, such as at most 95%, especially at most 90%, of a spectral power of the second device light may be in the angular ranges of 30-150° and 210-330°. Hence, looking along the second axis of elongation A2, the LED filament may be configured to provide second device light over at least two circle sections (especially a full circle) around the second axis of elongation A2.

[0026] The second device light may be white light. Additionally or alternatively, in embodiments, the first device light may be white light. The term “white light”, and similar terms, herein, is known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1800 K and 20000 K, such as between 2000 and 20000 K, especially between 2700 and 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700-6500 K. The correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within 10 SDCM from the BBL, such as within 5 SDCM from the BBL. Further, in embodiments, one or more of the first device light and the second device light may be white light. In such embodiments, the white (first and / or second) device light may especially have a correlated color temperature selected from the range of 1500-7000 K, such as from the range of 1700-6500 K, especially from the range of 1800-6000 K. Further, the white (first and / or second) device light may a color rendering index (CRI) of at least 80, such as at least 85, especially at least 90. Hence, in specific embodiments, one or more of the first device light and the second device light may be white light having a correlated color temperature selected from the range of 1700-6500 K. Device light having a CCT selected from the range of 1700-6500 K may be especially suitable for applications ranging from mood lighting to functional lighting.

[0027] In embodiments, (both) the first device light and the second device light may be white light, wherein the CCT of the first device light may be equal to (e.g., within 50 K, especially within 25 K of) the CCT of the second device light. In (such) embodiments, a first CRI (CRIi) of the first device light may be equal to a second CRI (CRI2) of the second device light, such as |CRIi - CRI2I < 5, especially, |CRIi - CRI2I < 2. Alternatively, in embodiments, |CRIi - CRI2I > 5, such as |CRIi - CRI2I > 7, especially |CRIi - CRI2I > 10. Alternatively, (both) the first device light and the second device light may be white light, wherein the CCT of the first device light differs from the CCT of the second device light. Especially, the (white) first device light may have a first correlated color temperature (Tci) selected from the range of 1500-7000 K, such as from the range of 1700-6500 K, especially from the range of 1800-6000 K. Further, the (white) second device light may have a second correlated color temperature (TC2) (individually) selected from the range of 1500-7000 K, such as from the range of 1700-6500 K, especially from the range of 1800-6000 K. In embodiments, |Tci - TC2| > 0 K, such as |Tci - Tc2| > 50 K, especially |Tci - Tc2| > 100 K. Additionally or alternatively, in embodiments, |Tci - Tc2| < 500 K, such as |Tci - Tc2| < 300 K, especially |Tci - TC2| < 150 K. Hence, in specific embodiments, the first device light may be white light having a first correlated color temperature (Tci) selected from the range of 1700-6500 K, and the second device light may be white light having a second correlated color temperature (TC2) selected from the range of 1700-6500 K, wherein |Tci - Tc2| < 300 K. Such a difference in CCT may facilitate that the first device light and second device light may have a similar appearance. Hence, such a difference in CCT may facilitate a uniform appearance of the light generating system (during operation). The second device light may have a higher CCT than the first device light. Especially, in embodiments, Tc2 - Tci > 50 K, such as Tc2 - Tci > 100 K, especially Tc2 - Tci > 150 K. Alternatively, the first device light may have a higher CCT than the second device light. In specific embodiments, Tci - Tc2 > 50 K, such as Tci - Tc2 > 100 K, especially Tci - Tc2 > 150 K. A difference in CCT between the first device light and the second device light may facilitate that one of the first and second device light may be more functional lighting with a higher CCT, while the other of the first and second device light may be mood lighting with a lower CCT.

[0028] In (other) embodiments, one or more of the first device light and the second device light may be colored light. Especially, one or more of the first device light and the second device light may be selected from the group of violet light, blue light, green light, yellow light, orange light, and red light. The term “violet light”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. The term “blue light”, and similar terms, may especially relate to light having a wavelength in the range of about 440-490 nm. The term “green light”, and similar terms, may especially relate to light having a wavelength in the range of about 490-560 nm. The term “yellow light”, and similar terms, may especially relate to light having a wavelength in the range of about SOO- SOO nm. The term “orange light”, and similar terms, may especially relate to light having a wavelength in the range of about 590-620 nm. The term “red light”, and similar terms, may especially relate to light having a wavelength in the range of about 620-780 nm. The first device light and the second device light may be colored light having a color point (individually) selected from CIE 1931 color space. In such embodiments, the color point of the first device light may be the same as the color point of the second device light. Alternatively, the color point of the first device light may differ from the color point of the second device light. In further embodiments, one of the first device light and the second device light may be white light, and the other of the first device light and the second device light may be colored light. Hence, in specific embodiments, the first device light and the second device light may differ in one of more of color point, correlated color temperature, and color rendering index. This may provide a decorative and / or multi-colored effect to the light generating system, especially to the system light (see below).

[0029] As indicated above, the first subarray and the second subarray of the LED filament may be configured to provide second light source light having the same or a different spectral power distribution. Further, the second encapsulant configured on the first major surface may be the same or differ from the second encapsulant configured on the second major surface of the second elongated carrier. Hence, in embodiments, primary second device light provided from a first side of the LED filament (wherein the first major surface of the second carrier is configured facing the first side) may be the same or differ from secondary second device light provided from a second side of the LED filament (wherein the second major surface of the second carrier is configured facing the second side). The primary and secondary second device light may be: (i) white light having the same CCT and CRI, or (ii) colored light having the same color point. Alternatively, the primary second device light and secondary second device light may differ in one or more of color point, correlated color temperature, and color rendering index, and intensity.

[0030] As indicated above, the first device light may have a different spectral power distribution than the second device light. The light generating system may be configured to generate system light comprising, such as especially consisting of, one or more of the first device light and the second device light. Hence, one or more of the first device light and second device light may be colored light, wherein the system light may be colored light. Alternatively, one or more of the first device light and second device light may be colored light, wherein the system light may be white light. Alternatively, the first device light and the second device light may be white light, wherein the system light may be white light. The light generating system may comprise a control system. The control system may be configured to individually control (sets and / or subarrays of) the first (and / or second) solid state light sources. Further, the control system may be configured to individually control the LED strip and the LED filament. Especially, the control system may be configured to individually control one or more of a color point, CCT, CRI, and intensity of the first device light and second device light. Hence, in specific embodiments, the light generating system may comprise a control system, wherein the control system may be configured to individually control the LED strip and the LED filament. Such a control system may allow a user to adjust the spectral power distribution of the system light by controlling the LED strip and LED filament. Further, such a control system may allow a user to adjust an intensity of the first and second device light.

[0031] The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein the term “controlling” and similar terms may include imposing behavior on an element and / or monitoring the element. The controlling of the element can be done with a control system. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. The control system and element may not be physically coupled. Control can be done via wired and / or wireless control. A control system may comprise or may be functionally coupled to a user interface. The control system may also be configured to receive and execute instructions from a remote control. The control system may be controlled via an App on a device, such as a portable device. In such embodiments the control system of the lighting system may be a slave control system. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology. The control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme. As indicated above, the LED strip and LED filament may be (directly or indirectly) physically coupled. The LED strip and LED filament may be flexibly or moveably physically coupled (i. e. , the LED strip and LED filament may move with respect to each other with one or more degrees of freedom). Especially, the LED filament may be configured to pivot with respect to the LED strip. Alternatively, the LED strip and LED filament may be rigidly physically coupled (i. e. , the LED strip and LED filament may have a fixed orientation with respect to each other). The light generating system may comprise one or more coupling elements. Especially, the LED filament may comprise the one or more coupling elements. The one or more coupling elements may especially be configured to physically couple the LED strip and the LED filament. The one or more coupling elements may be selected from the group comprising (electrical) wiring, pins, brackets, hinges, (ball, plane, hinge, saddle, pivot, and / or universal) joints, screws, and bolts. Hence, in specific embodiments, the LED filament may comprise one or more coupling elements, wherein the one or more coupling elements may be configured to physically couple the LED strip and the LED filament. Such coupling elements may facilitate that the LED filament may move freely with respect to the LED strip. Alternatively, such coupling elements may facilitate securely and immovably attaching the LED filament to the LED strip.

[0032] The LED strip and the LED filament may be (physically and) mechanically coupled. Further, the LED strip and the LED filament may be in (direct) physical contact with each other. Hence, in specific embodiments, the LED strip and the LED filament may be mechanically coupled and may be in physical contact with each other. Physical contact between the LED strip and LED filament may provide a stronger contact between the LED strip and LED filament, thereby providing a more durable light generating system. Further, physical contact may provide the benefit that the LED strip and LED filament may appear as a single component, which may be more decorative. Additionally, physical contact may improve the thermal coupling between the LED strip and LED filament, thereby increasing heat dissipation from the light generating system.

[0033] The LED strip and LED filament may be electrically coupled. Especially, the LED strip may comprise a primary first electrode and a secondary first electrode. The primary and secondary first electrodes may be (uniquely) selected from the group of an anode and a cathode, and may be electrically coupled to (one or more of) the first solid state light sources. Further, the primary first electrode and the secondary first electrode may be separated by > 0.7*Li, such as > 0.8*Li, especially > 0.9*Li. Additionally, the LED filament may comprise a primary second electrode and a secondary second electrode. The primary and secondary second electrodes may be (uniquely) selected from the group of an anode and a cathode, and may be electrically coupled to (one or more of) the second solid state light sources. Further, the primary second electrode and the secondary second electrode may be separated by > 0.7*L2, such as > 0.8*L2, especially > 0.9*L2. The primary first electrode may be electrically coupled to the primary second electrode. Especially, in embodiments, the LED strip and LED filament may be connected in series. Connecting the LED strip and filament in series may provide the benefit that a smaller reduction in voltage may be required in a LED driver electrically coupled to the LED strip and filament, improving the efficiency of said LED driver.

[0034] Alternatively, the LED strip may comprise at least two, such as at least three, especially at least four, sets of first electrodes. Additionally or alternatively, the LED strip may comprise at most six, such as at most five, especially at most four, sets of first electrodes. In embodiments, each set of first electrodes may comprise an anode and a cathode. Further, the at least two sets of first electrodes may comprise a first set of first electrodes (and a second set of first electrodes). The LED filament may comprise at least one set of second electrodes. Alternatively, the LED filament may comprise at most three sets of second electrodes. In embodiments, each set of second electrodes may comprise an anode and a cathode. The at least one set of second electrodes may comprise a first set of second electrodes. The first set of second electrodes may especially be configured at the second end portion. Further, the first set of second electrodes may be electrically coupled to the first set of first electrodes. In (such) embodiments, the second set of first electrodes may be connected to a power source. Hence, in embodiments, in a direction of an electrical current, electrons may pass through the LED strip, through the LED filament, and (back) through the LED strip. Especially, in embodiments, the LED filament may be (exclusively) powered by (and / or via) the LED strip, wherein power is provided to a conductive path in the LED filament forming a loop from the cathode of the first set of second electrodes, through the plurality of second solid state light sources, to the anode of the first set of second electrodes. Hence, in specific embodiments, the LED strip and the LED filament may be electrically coupled, wherein one of the following applies: (A) the LED strip may comprise a primary first electrode and a secondary first electrode, wherein the primary first electrode and the secondary first electrode may be separated by > 0.8*Li, and the LED filament may comprise a primary second electrode and a secondary second electrode, wherein the primary second electrode and the secondary second electrode may be separated by > 0.8*L2, wherein the primary first electrode may be electrically coupled to the primary second electrode; and (B) the LED strip may comprise at least two sets of first electrodes, wherein the at least two sets of first electrodes may comprise a first set of first electrodes, and the LED filament may comprise at least one set of second electrodes, wherein the at least one set of second electrodes may comprise a first set of second electrodes, wherein the first set of second electrodes may be configured at the second end portion, and wherein the first set of second electrodes may be electrically coupled to the first set of first electrodes. A configuration according to (A) may facilitate connecting the LED strip and LED filament in series, thereby providing the benefit that a smaller reduction in voltage may be required in a LED driver. Alternatively, a configuration according to (B) may provide the benefit that the LED filament may be electrically coupled to a power source via the LED strip. Hence, with such a configuration the LED filament may be freely configured at any location, without the need for a nearby power source, and without electrical connections showing.

[0035] The LED strip and LED filament may be configured at any angle with respect to each other. Especially, the first axis of elongation (Ai) and the second axis of elongation (A2) may be configured at a (smallest) first mutual angle (ai) selected from the range of 0- 180°, such as from the range of 10-170°, especially from the range of 30-150°, like from the range of 30-130°. Further, as indicated above, one or more of the LED strip and the LED filament may be curved. In such embodiments, at least part of the first axis of elongation (Ai) (following the shape of the LED strip) may have the first mutual angle (ai) with at least part of the second axis of elongation (A2) (following the shape of the LED filament). The first axis of elongation (Ai) may especially have the first mutual angle (ai) with the second axis of elongation (A2) at the point where the LED strip is physically coupled to the LED filament. Hence, in specific embodiments, for at least part of the LED strip and LED filament may apply that a first mutual angle (ai) between the first axis of elongation (Ai) and the second axis of elongation (A2) may be selected from the range of 30-150°. Configuring the LED strip and LED filament at a first mutual angle (ai) of 30-150° may provide a decorative effect, wherein for instance the light generating system may be configured as a 2D or 3D structure. Further, such a first mutual angle (ai) may provide the benefit that the light generating system may be applied in more narrow luminaires, as the total length of the system may be less than L1+L2.

[0036] As indicated above, the light generating system may be fixated to a surface, such as especially a substrate, via the LED strip and / or LED filament. Hence, in embodiments, the LED strip (and / or LED filament) may comprise a fixating element, configured to fixate at least part of the LED strip (and / or LED filament) to a substrate. The fixating element may be any fixating element known in the art. The fixating element may be selected from the group comprising an adhesive layer, a (comer) bracket, an interlocking system configured to interlock with the substrate, and a rope-like fixating element (e.g. a cable, string, zip-tie, etc.). Further, the LED strip (and / or LED filament), such as especially the fixating element, may comprise a spacer, configured to provide a (fixed) distance between the carrier of the LED strip (and / or LED filament) and the substrate after fixation. The spacer may comprise a thermally conductive material (see below). Further, the spacer may be configured over at least part of the length of the fixating element. Alternatively, the spacer may comprise one or more spacer elements, for instance configured at one or more comers of the fixating element. In specific embodiments, the fixating element may comprise an adhesive layer, especially applied to at least part of a (second) major surface of the second elongated carrier. Further, in embodiments, the substrate may be selected from the group comprising a (part of a) luminaire housing, a wall, a mirror, a shelf, a ceiling, a floor, a frame, a wooden surface, a metal surface, a polymeric surface, and a glass surface. Hence, in specific embodiments, the LED strip may further comprise a fixating element, wherein the fixating element may be configured to fixate the LED strip to a substrate. Such a fixating element may facilitate fixating the light generating system to a substrate via the LED strip. As the LED strip may provide first device light mainly in an angular range of < 180°, such a fixating element may especially fixate the light generating system without reducing the lumen output of the light generating system.

[0037] The light generating system may comprise one or more optical elements. The one or more optical elements may comprise one or more selected from the group comprising lenses, reflectors, (dichroic and / or polarizing) beam splitters, semi-transparent mirrors, diffusers, and light filters. In embodiments, the one or more optical elements may comprise one or more reflectors, wherein at least one of the one or more reflectors may be configured facing the second major surface of the second elongated carrier. Further, at least one of the one or more reflectors may be configured in a light receiving relationship with the LED strip and / or LED filament. Alternatively, the one or more optical elements may comprise one or more of lenses, (dichroic and / or polarizing) beam splitters, semi-transparent mirrors, diffusers, and light filters, wherein at least one of the one or more optical elements may be configured downstream of (and in a light receiving relationship with) the LED strip and / or LED filament. The one or more optical elements may be configured to one or more of (i) shape the first beam and / or second beam, (ii) guide the first beam and / or second beam, and (iii) adjust the spectral power properties of the system light. The light generating system may comprise a luminaire. The luminaire may comprise a luminaire housing, configured to house the light generating system. The LED strip may be configured in (physical and) thermal contact with the luminaire housing (optionally via the fixating element and / or spacer). Especially, in embodiments, the luminaire housing may comprise the substrate. Further, in embodiments, the luminaire housing may be at least partially reflective for one or more of the first device light and second device light. Especially, at least part of the luminaire housing (such as the part configured in thermal contact with the LED strip) may be reflective for the first device light and / or the second device light. An element may be considered in “thermal contact” (or “thermally coupled”) with another element if it can exchange energy through the process of heat. Thermal contact may be achieved by physical contact. Thermal contact may further be achieved via a thermally conductive material. Thermal contact may also be achieved between two elements when the two elements are arranged at a distance of < 10 pm relative to each other, though larger distances (e.g. < 100 pm) may be possible. The shorter the distance, the better the thermal contact. Especially, the distance may be < 10 pm, such as < 5 pm, such as < 1 pm. The distance may be the distance between two respective surfaces of the respective elements. The distance may be an average distance. Hence, in embodiments in average the distance between the two elements may be < 10 pm. When two elements are in thermal contact, they may be in physical contact or may be configured at a short distance of each other, such as at maximum 1 mm. When the two elements are configured at a distance from each other, an intermediate material may be configured in between, though in other embodiments, the distance between the two elements may filled with a gas, liquid, or may be vacuum. When an intermediate material is available, the larger the distance, the higher the thermal conductivity may be useful for thermal contact between the two elements. However, the smaller the distance, the lower the thermal conductivity of the intermediate material may be (of course, higher thermal conductive materials may also be used).

[0038] Hence, in embodiments, the LED strip, such as especially the first elongated carrier, may comprise a thermally conductive material. Further, in embodiments, the fixating element may comprise a thermally conductive material. A thermally conductive material may have a thermal conductivity of > 20 W / (m*K), like > 30 W / (m*K), such as > 100 W / (m*K), especially > 200 W / (m*K). The thermally conductive material may comprise one or more of copper, aluminum, silver, gold, silicon carbide, aluminum nitride, boron nitride, aluminum silicon carbide, beryllium oxide, a silicon carbide composite, aluminum silicon carbide, a copper tungsten alloy, a copper molybdenum carbide, magnesium, aluminum oxide, carbon, diamond, and graphite. The thermally conductive material may be configured in thermal contact with one or more of a heatsink and a heat spreader (configured in the luminaire housing), and may e.g. transfer heat to such heatsink or heat spreader. The second elongated carrier may comprise a thermally conductive material. Yet, a first thermal conductivity ki of the first elongated carrier may be higher than a second thermal conductivity k2 of the second elongated carrier, such as k2 < ki, like k2 < 0.9*ki, especially k2 < 0.75*ki. Hence, in specific embodiments, the light generating system may comprise a luminaire, wherein the luminaire may comprise a luminaire housing, wherein the luminaire housing may be at least partially reflective for one or more of the first device light and the second device light, wherein the first elongated carrier may comprise a thermally conductive material, and wherein the LED strip may be configured in thermal contact with the luminaire housing. Such a configuration may provide heat dissipation and protection against ingress for the light generating system.

[0039] The light generating system may comprise a plurality of LED filaments, such as 2-100, especially 3-50, like 4-20 LED filaments. In (such) embodiments, each of the plurality of LED filaments may be configured physically coupled to (at least one of) the LED strip(s). Further, each of the plurality of LED filaments may be configured electrically coupled to a (different) set of first electrodes. Additionally or alternatively, the light generating system may comprise a plurality of LED strips, such as 2-100, especially 3-50, like 4-20 LED strips. The plurality of LED strips may be physically (and electrically) coupled via at least one LED filament. Hence, in specific embodiments, one or more may apply of: (A) the light generating system may comprise a plurality of LED filaments, wherein each of the plurality of LED filaments may be physically and electrically coupled to the LED strip; and (B) the light generating system may comprise a plurality of LED strips, wherein the plurality of LED strips may be physically and electrically coupled via at least one LED filament. A light generating system comprising a plurality of LED strips and / or LED filaments may facilitate that more complicated and / or decorative structures may be provided. Especially, a plurality of LED strips may provide the benefit that a relatively large part of the light generating system may be placed in thermal contact with a substrate (e.g. a luminaire housing), thereby improving thermal management. Alternatively, a plurality of LED filaments may facilitate that a relatively large part of the light generating system may be configured to provide omnidirectional light, increasing the illuminated area around the system.

[0040] The plurality of LED filaments may all provide second device light having the same intensity and / or spectral power distribution. Yet, in specific embodiments, the second device light of at least two of the plurality of LED filaments may differ in one or more of color point, correlated color temperature, color rendering index, and intensity. Further, in embodiments, the plurality of LED strips may all provide first device light having the same intensity and / or spectral power distribution. Yet, in specific embodiments, the first device light of at least two of the plurality of LED strips may differ in one or more of color point, correlated color temperature, color rendering index, and intensity. Light generating systems wherein the first and / or second device light of at least two LED strips and / or LED filaments, respectively, may differ may provide a larger range of tuneability for the system light. Further, a multi-colored system may be more decorative.

[0041] In embodiment, at least part of the first axis of elongation (Ai) of each of the plurality of LED strips may have an (individually selected) first mutual angle (ai) with at least part of the second axis of elongation (A2) of (at least one of the plurality of) the LED filament(s). Additionally or alternatively, at least part of the second axis of elongation (A2) of each of the plurality of LED filaments may have an (individually selected) first mutual angle (ai) with at least part of the first axis of elongation (Ai) of (at least one of the plurality of) the LED strip(s). In such embodiments, the (plurality of) LED strip(s) may form a three- dimensional structure with the (plurality of) LED filament(s). Hence, in specific embodiments, the plurality of LED filaments and / or the plurality of LED strips may form a three-dimensional structure. Such a three-dimensional structure may better fill a luminaire housing. Further, such a three-dimensional structure may be more decorative.

[0042] As indicated above, the first and / or second elongated encapsulant may comprise a luminescent material. The term “luminescent material” may refer to a material that can convert first radiation, especially one or more of UV radiation and blue radiation, into second radiation, especially visible light. Herein, UV (ultraviolet) may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm, though other wavelengths may also be possible. The terms “visible light”, and similar terms, refer to light having one or more wavelengths in the range of about 380-780 nm. In general, the first radiation and second radiation have different spectral power distributions, with the second radiation especially having a spectral power distribution at larger wavelengths than the first radiation (i.e. “down-conversion”). Hence, upon excitation with radiation, the luminescent material may emit radiation. Further, the term “luminescent material” may refer to phosphorescence and / or fluorescence. The term “luminescent material” may also refer to a plurality of different luminescent materials. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. Examples of possible luminescent materials are indicated below. Instead of the term “luminescent material” also the term “phosphor” may be applied, as is known to the person skilled in the art.

[0043] In embodiments, luminescent materials may be selected from garnets and nitrides, especially doped with trivalent cerium or divalent europium, respectively. The term “nitride” may also refer to oxynitride or nitridosilicate, etc. Alternatively or additionally, the luminescent material(s) may be selected from silicates, especially doped with divalent europium. The luminescent material may comprise a divalent europium comprising oxynitride luminescent material. Further, in embodiments, the luminescent material may comprise a divalent europium comprising nitride luminescent material.

[0044] The luminescent material may comprise a cerium comprising garnet luminescent material of the type AaBsOnT'e. wherein A comprises one or more of yttrium (Y), lanthanum (La), gadolinium (Gd), terbium (Tb) and lutetium (Lu), and wherein B comprises one or more of aluminum (Al), gallium (Ga), indium (In), and scandium (Sc); and wherein the light source light may comprise blue light. Embodiments of garnets especially include A3B5O12 garnets, wherein A comprises at least Y or Lu, and wherein B comprises at least Al. Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of Ce and Pr. Further, B and O may at least partly be replaced by Si and N. The term “:Ce”, indicates that part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce. This is known to the person skilled in the art.

[0045] The luminescent material may comprise a luminescent material of the type AsSieNinCe3, wherein A comprises one or more of Y, La, Gd, Tb and Lu, such as in embodiments one or more of La and Y. The luminescent material may alternatively or additionally comprise one or more of MS:Eu2+and / or I LSis Eu2and / or MAISiN.vEu2and / or Ca2AlSi3ChN5:Eu2+, etc., wherein M comprises one or more of Ba, Sr and Ca, especially in embodiments at least Sr.

[0046] The term “luminescent material” herein especially relates to inorganic luminescent materials. Alternatively or additionally, also other luminescent materials may be applied. For instance quantum dots and / or organic dyes may be applied and may optionally be embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc..

[0047] The luminescent material may comprise a tetravalent manganes e-comprising luminescent material, i.e., a luminescent material doped with tetravalent manganese. Especially, in embodiments, the luminescent material may comprise a luminescent material of the type M’xM2-2xAXe:Mn4+, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x may be selected from the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, and wherein X comprises a monovalent anion, at least comprising fluorine. The alkaline earth cation M’ may comprise one or more of magnesium (Mg), strontium (Sr), calcium (Ca), and barium (Ba), especially one or more of Sr and Ba. Further, the alkaline cation M may comprise one or more of sodium (Na), potassium (K), rubidium (Rb), ammonium (NFU+), lithium (Li), and cesium (Cs), such as at least K, or such as at least Rb. In embodiments, A may comprise a tetravalent cation, and preferably at least comprises silicon. A may (further) comprise one or more of titanium (Ti), germanium (Ge), stannum (Sn) and zinc (Zn). The monovalent anion X may comprise fluorine (F), chlorine (Cl), bromine (Br), and iodine (I), such as at least F. The luminescent material may be coated, as described in WO2013121355A1.

[0048] The term “light source” may in principle relate to any light source known in the art. In a specific embodiment, the light source may comprise a solid state light source (such as a LED or laser diode). The term “light source” may also refer to a chip scale package (CSP) and / or a chip scale packaged (CSP) LED. A CSP may comprise a single solid state die (such as a LED) with provided thereon a luminescent material comprising layer. The term “light source” may also refer to a midpower package. A midpower package may comprise one or more solid state die(s), optionally covered by a luminescent material comprising layer. The die dimensions may be < 2 mm, such as in the range of e.g. 0.2-2 mm. Herein, the term “light source” may also refer to mini LEDs or micro LEDs, such as especially micro LEDs or “microLEDs”. Herein, the term mini LED refers to solid state light sources having (die) dimensions, especially length and width, selected from the range of 0.1- 1 mm. Further, the term micro LED refers to solid state light sources having (die) dimensions, especially length and width, selected from the range of < 100 pm.

[0049] The term “light source” may refer to a semiconductor light-emitting device, such as an LED, a resonant cavity LED (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic LED (OLED), such as a passive-matrix (P MOLED) or an active-matrix (AMOLED). In an embodiment, the light source a LED, a laser diode, a superluminescent diode, or a multi -junction LED.

[0050] The light source may be configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED. Such LEDs may be indicated as direct color LEDs. In other embodiments, the light source may be configured to provide primary radiation and part of the primary radiation may converted into secondary radiation (e.g. by a luminescent material). The luminescent material may be comprised by the light source, such as an LED with a luminescent material layer or dome. Such LEDs may be indicated as phosphor converted LEDs or PC LEDs.

[0051] The light generating system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) (road) lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting. The light generating system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems.

[0052] In yet a further aspect, the invention also provides a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc.. The lamp or luminaire may comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. In yet a further aspect, the invention also provides a projection device comprising the light generating system as defined herein. Especially, a projection device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projection device may include one or more light generating systems such as described herein. Hence, in an aspect the invention also provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system as defined herein. Especially, in a second aspect, the invention provides a lighting device selected from the group of a lamp and a luminaire, comprising the light generating system as defined herein. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the light generating system.

[0053] The terms “light” and “radiation” are herein interchangeably used, unless clear from the context that the term “light” only refers to visible light. The terms “light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:

[0055] Figs. 1A-B schematically depict an embodiment of the light generating system;

[0056] Fig. 2-4 schematically depict further embodiments of the light generating system;

[0057] Fig. 5 schematically depicts an embodiment of the light generating system having a 3D structure; and

[0058] Fig. 6 schematically depicts an embodiment of the lighting device.

[0059] The schematic drawings are not necessarily to scale.

[0060] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] Fig. 1A schematically depicts an embodiment of the light generating system 1000. The light generating system 1000 may comprise a LED strip 400 and a LED filament 500. The LED strip 400 may comprise a first axis of elongation Ai, and have a first length Li. Further, the LED strip 400 may be configured to generate a first beam 4 of first device light 401. At least 90% of a spectral power of the first device light 401 may be in an angular range of 0-180° around the first axis of elongation AL Further, the first device light 401 may have a non-zero light intensity over the entire range of 30-150° (around the first axis of elongation Ai). The LED filament 500 may comprise a second axis of elongation A2 and have a second length L2. In embodiments, L1 / L2 < 0.8 or L1 / L2 > 1.2. The LED filament 500 may especially be configured to generate a second beam 5 of second device light 501. The second device light 501 may have a non-zero light intensity over the entire range of 30-150° and 210-330° around the second axis of elongation A2. A first end portion 4001 of the LED strip 400 may be physically coupled to a second point P2 along the second length L2 of the LED filament 500. The second point P2 may be configured at xl*L2. In Fig. 1A, xl may be (essentially) 0. Yet, especially, xl may be selected from the range of 0.1-0.9. Alternatively, a second end portion 5001 of the LED filament 500 may be physically coupled to a first point Pi along the first length Li of the LED strip 400. The first point Pi may be configured at x2*Li. In Fig. 1A, x2 may be (essentially) 0. Yet, especially, x2 may be selected from the range of 0.1-0.9. Alternatively, the first end portion 4001 may be physically coupled to the second end portion 5001. The light generating system 1000 may be configured to generate system light 1001 comprising one or more of the first device light 401 and second device light 501.

[0062] The LED strip 400 may comprise (i) a first elongated carrier 450 along the first axis of elongation Ai, (ii) a first array 100 of a plurality of first solid state light sources 10 on a first major surface 451 of the first elongated carrier 450, and (iii) a first elongated encapsulant 410 at least partially enclosing the plurality of first solid state light sources 10 and at least partially covering the first major surface 451 of the first elongated carrier 450. Similarly, the LED filament 500 may comprise (i) a second elongated carrier 550 along the second axis of elongation A2, (ii) a second array 200 of a plurality of second solid state light sources 20 on at least a first major surface 551 of the second elongated carrier 550, and (iii) a second elongated encapsulant 510 at least partially enclosing the plurality of second solid state light sources 20 and at least partially covering the first major surface 551 and at least part of a second major surface 552 of the second elongated carrier 550. In embodiments, one of the first elongated carrier 450 and the second elongated carrier(550 may be flexible, and the other of the first elongated carrier 450 and the second elongated carrier 550 may be rigid. Further, the second elongated carrier 550 may be light transmissive for at least part of a spectral wavelength range of the second device light 501. Additionally or alternatively, the second array 200 of the plurality of second solid state light sources 20 may comprise a first subarray 201 configured on the first major surface 551 and a second subarray 202 (see Fig. IB) configured on the second major surface 552 of the second elongated carrier 550. Second solid state light sources 20 in the first subarray 201 are indicated by reference 20, and second solid state light sources 20 in the second subarray 202 are indicated by reference 20’. Further, the first subarray 201 may be configured to generate second light source light 21, and the second subarray 202 may be configured to generate second light source light 21’.

[0063] The plurality of first solid state light sources 10 may be configured to generate first light source light 11. Especially, the first solid state light sources 10 may comprise LEDs. Further, the first elongated encapsulant 410 may comprise at least one of (i) a first luminescent material 210 configured to convert at least part of the first light source light 11 received by the first elongated encapsulant 410 into first luminescent material light 211, and (ii) a first light scattering material 610 configured to scatter at least part of the first light source light 11 received by the first elongated encapsulant 410 into scattered first light source light 611. The first device light 401 may comprise one or more of the first luminescent material light 211 and the scattered first light source light 611. Further, the plurality of second solid state light sources 20 may be configured to generate second light source light 21. Especially, the second solid state light sources 20 may comprise LEDs. The second elongated encapsulant 510 may comprise at least one of (i) a second luminescent material 220 configured to convert at least part of the second light source light 21 received by the second elongated encapsulant 510 into second luminescent material light 221, and (ii) a second light scattering material 620 configured to scatter at least part of the second light source light 21 received by the second elongated encapsulant 510 into scattered second light source light 621. Especially, the second device light 501 may comprise one or more of the second luminescent material light 221 and the scattered second light source light 621. The second encapsulant 510 configured on the first major surface 551 may differ from the second encapsulant 510 configured on the second major surface 552 in one or more of (a) the type and / or composition of the second luminescent material 220, and (b) the concentration of second light scattering material 620. Second luminescent material 220 comprised by the second encapsulant 510 configured on the second major surface 552 is indicated by reference 220’, and the second luminescent material light generated by the second luminescent material 220’ is indicated by reference 221’. Similarly, second light scattering material 620 comprised by the second encapsulant 510 configured on the second major surface 552 is indicated by reference 620’, and the scattered second light source light provided by the second light scattering material 620’ is indicated by reference 621’. Further, the LED filament 500 may be configured to provide primary second device light 501 from a first side of the LED filament 500, and secondary second device light 501’ from a second side of the LED filament 500.

[0064] The LED strip 400 may comprise a fixating element 420, wherein the fixating element 420 may be configured to fixate (at least part of) the LED strip 400 to a substrate 2000 (see Fig. 5). The fixating element 420 may be configured on a second major surface 452 of the first elongated encapsulant 450. Further, the LED filament 500 may comprise one or more coupling elements 560. The one or more coupling elements 560 may be configured to physically couple the LED strip 400 and the LED filament 500.

[0065] Fig. IB schematically depicts a further embodiment of the light generating system 1000. Fig. 1B(I) schematically depicts a cross-section of the LED strip 400 in a plane perpendicular to the first axis of elongation Ai. Reference otbi indicates the angular range wherein at least 90% of a spectral power of the first device light 401 may be provided (during operation of the LED strip 400). Reference ab2,i indicates the angular range of 30-150°, over which the first device light 401 may have a non-zero light intensity. Further, reference abi,o indicates the angular range wherein at most 10% of a spectral power of the first device light 401 may be provided (during operation of the LED strip 400). Fig. 1B(II) schematically depicts a cross-section of the LED filament 500 in a plane perpendicular to the second axis of elongation A2. Reference 011,2 indicates the angular range (0-360°) wherein at least 90% of a spectral power of the second device light 501 may be provided (during operation of the LED filament 500). Reference ab2,i indicates the angular range of 30-150°, and reference ab2,2 indicated the angular range of 210-330°, over which the second device light 501 may have a non-zero light intensity. The LED strip 400 and the LED filament 500 may be mechanically coupled and in physical contact with each other. Additionally or alternatively, the first elongated carrier 450 may be opaque for at least part of a spectral wavelength range of the first device light 401. Further, at least one of the first elongated encapsulant 410 and the second elongated encapsulant 510 may comprise a luminescent material.

[0066] Fig. 2 schematically depicts a further embodiment of the light generating system 1000 in a top view. For at least part of the LED strip 400 and at least part of the LED filament 500 it may apply that a first mutual angle ai between the first axis of elongation Ai and the second axis of elongation A2 may be selected from the range of 30-150°. Further, the light generating system 1000 may comprise a control system 300. The control system 300 may be configured to individually control the LED strip 400 and the LED filament 500.

[0067] Fig. 3 schematically depicts a further embodiment of the LED strip 400 and LED filament 500 depicted without the first and second elongated encapsulants 410,510, to show the electrical connections in the LED strip 400 and LED filament 500. The LED strip 400 and the LED filament 500 may be electrically coupled. Especially, as depicted in Fig. 3(1), the LED strip 400 may comprise a primary first electrode 4100 and a secondary first electrode 4200. The primary first electrode 4100 and the secondary first electrode 4200 may be separated by > 0.8*Li. Further, the LED filament 500 may comprise a primary second electrode 5100 and a secondary second electrode 5200. The primary second electrode 5100 and the secondary second electrode 5200 may be separated by > 0.8*L2. Further, the primary first electrode 4100 may be electrically coupled to the primary second electrode 5100. Hence, the LED strip 400 and LED filament 500 may be connected in series (to a power source 1300).

[0068] Alternatively, as depicted in Fig. 3(11), the LED strip 400 may comprise at least two sets of first electrodes 800. The at least two sets of first electrodes 800 may especially comprise a first set of first electrodes 810 (and a second set of first electrodes 820). Further, the LED filament 500 may comprise at least one set of second electrodes 900. The at least one set of second electrodes 900 may comprise a first set of second electrodes 910. Especially, the first set of second electrodes 910 may be configured at the second end portion 5001. Further, the first set of second electrodes 910 may be electrically coupled to the first set of first electrodes 810. Further yet, the second set of first electrodes 820 may be connected to a power source 1300. Hence, in embodiments, a conductive path in the LED filament 500 may form a loop, wherein the ends of the conductive path are (both) connected to the same LED strip 400. The light generating system 1000 may comprise a plurality of LED filaments 500, 500a, 500b, 500c (see Fig. 3(111)). Each of the plurality of LED filaments 500, 500a, 500b, 500c, may be physically and electrically coupled to the LED strip 400. Further, each of the plurality of LED filaments 500, 500a, 500b, 500c, may comprise at least a first set of second electrodes 910, 910a, 910b, 910c electrically coupled to a respective set of first electrodes 810,830,840,850 (at respectively the first end portion 4001 or a first point Pia,Pib,Pic). A combination of LED filaments 500 connected in series with the LED strip 400 and LED filaments 500 connected in a loop with the LED strip 400 may also be possible.

[0069] Fig. 4 schematically depicts a further embodiment of the light generating system 1000 comprising a plurality of LED filaments 500. Each of the plurality of LED filaments 500 may comprise a respective second axis of elongation Ayi, at least partially configured at an individually selected first mutual angle ai with at least part of the first axis of elongation AL Further, the two most right LED filaments 500 may be configured physically coupled to the LED strip 400 at first points Pic, P if configured at x2*Li, wherein x2 ~ 0.19. The two middle LED filaments 500 may be configured physically coupled to the LED strip 400 at first points Pib,Pie configured at x2*Li, wherein x2 » 0.5. The two most left LED filaments 500 may be configured physically coupled to the LED strip 400 at first points Pia,Pid configured at x2*Li, wherein x2 » 0.78.

[0070] Fig. 5 schematically depicts an embodiment of the light generating system 1000 comprising a luminaire 1100. The luminaire 1100 may comprise a luminaire housing 1110. The luminaire housing 1110 may be at least partially reflective for one or more of the first device light 401 and the second device light 501. Further, the first elongated carrier 450 may comprise a thermally conductive material. Especially, the LED strip 400 may be configured in (physical and) thermal contact with the luminaire housing 1110 (via the fixating element 420).

[0071] The light generating system 1000 may comprise a plurality of LED strips 400. Especially, the plurality of LED strips 400 may be physically and electrically coupled (to each other) via at least one LED filament 500. Further, the plurality of LED filaments 500 and / or the plurality of LED strips 400 may form a three-dimensional structure. Fig. 6 schematically depicts an embodiment of a luminaire 2 comprising the light generating system 1000. Reference 301 indicates a user interface which may be functionally coupled with a control system 300 comprised by or functionally coupled to the light generating system 1000. Fig. 6 also schematically depicts an embodiment of a lamp 1 comprising the light generating system 1000. Hence, Fig. 6 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1 and a luminaire 2, comprising the light generating system 1000. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of system light 1001, and may in specific embodiments be system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor, reference 1310 to a ceiling, and reference 1307 to a wall.

[0072] The term “plurality” refers to two or more. The terms “substantially” or “essentially” herein, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein the term “comprises” means “consists of’. The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term “comprising” may in an embodiment refer to “consisting of’ but may in another embodiment also refer to “containing at least the defined species and optionally one or more other species”. Use of the verb “to comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0073] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0074] The devices, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, or systems in operation. It should be noted that the above- mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0075] The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. The invention also provides a control system that may control the device or system, or that may execute a mode of operation of the system. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, or system, controls one or more controllable elements of such device, or system. The invention further applies to a device, or system comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method comprising one or more of the characterizing features described in the description and / or shown in the attached drawings.

[0076] The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

1. CLAIMS:

1. A light generating system (1000) comprising a LED strip (400) and a LED filament (500), wherein: the LED strip (400) comprises a first axis of elongation (Ai) and has a first length (Li); wherein the LED strip (400) is configured to generate a first beam (4) of first device light (401); wherein at least 90% of a spectral power of the first device light (401) is in an angular range of 0-180° around the first axis of elongation (Ai), with a non-zero light intensity over the entire range of 30-150°; the LED filament (500) comprises a second axis of elongation (A2) and has a second length (L2); wherein the LED filament (500) is configured to generate a second beam (5) of second device light (501) with a non-zero light intensity over the entire range of 30- 150° and 210-330° around the second axis of elongation (A2); and a first end portion (4001) of the LED strip (400) is physically coupled to a second point (P2) along the second length (L2) of the LED filament (500), or a second end portion (5001) of the LED filament (500) is physically coupled to a first point (Pi) along the first length (Li) of the LED strip (400), wherein the LED strip (400) and the LED filament (500) are electrically coupled, wherein one of the following applies: the LED strip (400) comprises a primary first electrode (4100) and a secondary first electrode (4200), wherein the primary first electrode (4100) and the secondary first electrode (4200) are separated by > 0.8*Li, wherein the LED filament (500) comprises a primary second electrode (5100) and a secondary second electrode (5200), wherein the primary second electrode (5100) and the secondary second electrode (5200) are separated by > 0.8*L2, wherein the primary first electrode (4100) is electrically coupled to the primary second electrode (5100); and the LED strip (400) comprises at least two sets of first electrodes (800), wherein the at least two sets of first electrodes (800) comprises a first set of first electrodes (810), wherein the LED filament (500) comprises at least one set of second electrodes (900), wherein the at least one set of second electrodes (900) comprises a first set of second electrodes (910), wherein the first set of second electrodes (910) is configured at the secondend portion (5001), and wherein the first set of second electrodes (910) is electrically coupled to the first set of first electrodes (810), and wherein the LED strip (400) further comprises a fixating element (420), and wherein the fixating element (420) is configured to fixate the LED strip (400) to a substrate (2000).

2. The light generating system (1000) according to claim 1, wherein: the LED strip (400) comprises (i) a first elongated carrier (450) along the first axis of elongation (Ai), (ii) a first array (100) of a plurality of first solid state light sources (10) on a first major surface (451) of the first elongated carrier (450), and (iii) a first elongated encapsulant (410) at least partially enclosing the plurality of first solid state light sources (10) and at least partially covering the first major surface (451) of the first elongated carrier (450); and the LED filament (500) comprises (i) a second elongated carrier (550) along the second axis of elongation (A2), (ii) a second array (200) of a plurality of second solid state light sources (20) on at least a first major surface (551) of the second elongated carrier(550), and (iii) a second elongated encapsulant (510) at least partially enclosing the plurality of second solid state light sources (20) and at least partially covering the first major surface(551) and at least part of a second major surface (552) of the second elongated carrier (550); wherein one or more applies of: (a) the second elongated carrier (550) is light transmissive for at least part of a spectral wavelength range of the second device light (501); and (b) the second array (200) of the plurality of second solid state light sources (20) comprises a first subarray (201) configured on the first major surface (551) and a second subarray (202) configured on the second major surface (552) of the second elongated carrier (550).

3. The light generating system (1000) according to claim 2, wherein the plurality of first solid state light sources (10) is configured to generate first light source light (11), wherein the first solid state light sources (10) comprise LEDs, wherein the first elongated encapsulant (410) comprises at least one of (i) a first luminescent material (210) configured to convert at least part of the first light source light (11) received by the first elongated encapsulant (410) into first luminescent material light (211), and (ii) a first light scattering material (610) configured to scatter at least part of the first light source light (11) received by the first elongated encapsulant (410) into scattered first light source light (611); wherein thefirst device light (401) comprises one or more of the first luminescent material light (211) and the scattered first light source light (611).

4. The light generating system (1000) according to any one of the preceding claims 2-3, wherein the plurality of second solid state light sources (20) is configured to generate second light source light (21), wherein the second solid state light sources (20) comprise LEDs, wherein the second elongated encapsulant (510) comprises at least one of (i) a second luminescent material (220) configured to convert at least part of the second light source light (21) received by the second elongated encapsulant (510) into second luminescent material light (221), and (ii) a second light scattering material (620) configured to scatter at least part of the second light source light (21) received by the second elongated encapsulant (510) into scattered second light source light (621); wherein the second device light (501) comprises one or more of the second luminescent material light (221) and the scattered second light source light (621).

5. The light generating system (1000) according to any one of the preceding claims, wherein one of the following applies: (a) the first end portion (4001) is physically coupled to the second end portion (5001); (b) the second point (P2) is configured at xl*L2, wherein xl is selected from the range of 0.1-0.9; and (c) the first point (Pi) is configured at x2*Li, wherein x2 is selected from the range of 0.1-0.9.

6. The light generating system (1000) according to any one of the preceding claims, wherein: one or more applies of: (a) the LED strip (400) and the LED filament (500) are mechanically coupled and are in physical contact with each other; and (b) the first elongated carrier (450) is opaque for at least part of a spectral wavelength range of the first device light (401); and at least one of the first elongated encapsulant (410) and the second elongated encapsulant (510) comprises a luminescent material.

7. The light generating system (1000) according to any one of the preceding claims, further comprising a control system (300), wherein the control system (300) is configured to individually control the LED strip (400) and the LED filament (500).

8. The light generating system (1000) according to any one of the preceding claims, wherein one or more applies of: for at least part of the LED strip (400) and at least part of the LED filament (500) applies that a first mutual angle (ai) between the first axis of elongation (Ai) and the second axis of elongation (A2) is selected from the range of 30-150°; andLi / L2< 0.8 or Li / L2> 1.2.

9. The light generating system (1000) according to any one of the preceding claims 2-8, wherein one or more applies of: (a) one or more of the first device light (401) and the second device light (501) is white light having a correlated color temperature selected from the range of 1700-6500 K, and (b) one of the first elongated carrier (450) and the second elongated carrier (550) is flexible, and the other of the first elongated carrier (450) and the second elongated carrier (550) is rigid.

10. The light generating system (1000) according to claim 9, wherein the first device light (401) is white light having a first correlated color temperature (Tci) selected from the range of 1700-6500 K, wherein the second device light (501) is white light having a second correlated color temperature (Tc2) selected from the range of 1700-6500 K, and wherein |Tci - Tc2| < 300 K.

11. The light generating system (1000) according to any one of the preceding claims 2-10, wherein the light generating system (1000) comprises a luminaire (1100), wherein the luminaire (1100) comprises a luminaire housing (1110), wherein the luminaire housing (1110) is at least partially reflective for one or more of the first device light (401) and the second device light (501), wherein the first elongated carrier (450) comprises a thermally conductive material, and wherein the LED strip (400) is configured in thermal contact with the luminaire housing (1110).

12. The light generating system (1000) according to any one of the preceding claims, wherein one or more applies of: the light generating system (1000) comprises a plurality of LED filaments (500), wherein each of the plurality of LED filaments (500) is physically and electrically coupled to the LED strip (400); andthe light generating system (1000) comprises a plurality of LED strips (400), wherein the plurality of LED strips (400) is physically and electrically coupled via at least one LED filament (500).

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

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