LED filament lamp

Abstract

The present invention relates to a LED filament lamp (1) comprising a LED filament arrangement (1') for emitting a white light output, and a control unit for controlling the white light output. The LED filament arrangement (1') comprises (i) a first LED filament component (4) having a first LED light source for emitting a first white light component of a first correlated color temperature and a first color point, the first color point having a first x color coordinate and a first y color coordinate, (ii) a second LED filament component (5) having a second LED light source for emitting a second white light component of a second correlated color temperature and a second color point, the second color point having a second x color coordinate and a second y color coordinate, and (iii) a third LED filament component (6) having a third LED light source for emitting a third white light component of a third color temperature and a third color point, the third color point having a third x color coordinate and a third y color coordinate. Each of the first correlated color temperature, the second correlated color temperature and the third correlated color temperature is different from the other two. The third correlated color temperature is at least 500 K lower than each of the first correlated color temperature and the second correlated color temperature. The first color point is located below the black body locus, the second color point is located on or above the black body locus, and the third color point is located on, or below, or above the black body locus, a color point located on the black body locus being within 10 SDCM from the black body locus, a color point located below or above the black body locus being at least 10 SDCM away from the black body locus. Each of the first x color coordinate, the second x color coordinate and the third x color coordinate is different from the other two by at least a value of 0,05, and / or each of the first y color coordinate, the second y color coordinate and the third y color coordinate is different from the other two by at least a value of 0,05.

Description

[0001] LED filament lamp

[0002] FIELD OF THE INVENTION

[0003] The invention relates to a light emitting diode, LED, filament lamp comprising a LED filament arrangement (1) configured to, in operation, emit white LED filament arrangement light, and a control unit configured, in operation, to control the white LED filament arrangement light.

[0004] BACKGROUND OF THE INVENTION

[0005] A trend in lighting is LED filament lamps. An LED filament lamp is an LED lamp which comprises a LED filament, and which is designed to resemble a traditional incandescent light bulb with a visible filament for aesthetic and light distribution purposes, but with the high efficiency of light-emitting diodes (LEDs).

[0006] A LED filament is providing LED filament light and comprises a plurality of LEDs arranged in a linear array. JP 2016 / 054070 discloses a lighting device comprising a semiconductor light-emitting device having at least one element unit that includes a first semiconductor light-emitting element emitting a first light of a color on a black body locus and a second semiconductor light-emitting element emitting a second light of the color which is different from the color of first light and is not overlapped with the black body locus; and a control device controlling output of the first semiconductor light-emitting element and the second semiconductor light-emitting element. The control device adjusts the output of the second semiconductor light-emitting element according to the output of the first semiconductor light-emitting element so that the second semiconductor element emits the color on the black body locus with higher color temperature than the first light.

[0007] It is desired to improve the performance in terms of light quality, CCT control, and the like, and / or appearance, e.g. reduced spottiness, line emission of LED filaments currently available on the market.

[0008] SUMMARY OF THE INVENTION

[0009] It is an object of the present invention to provide a LED filament lamp comprising such a LED filament arrangement. To this end, the present invention provides a light emitting diode, LED, filament lamp comprising a LED filament arrangement configured to, in operation, emit a white light output.

[0010] The LED filament arrangement comprises at least one first LED filament component comprising at least one first LED light source, the first LED filament component configured to, in operation, emit a first white light component having a first correlated color temperature, CCT1, and a first color point, CPI, the first color point having a first x color coordinates xl and a first y color coordinate yl; at least one second LED filament component comprising at least one second LED light source, the second LED filament component configured to, in operation, emit a second white light component having a second correlated color temperature, CCT2, and a second color point, CP2, having a second x color coordinate x2 and a second y color coordinate y2; and at least one third LED filament component comprising at least one third LED light source, the third LED filament component configured to, in operation, emit a third white light component having a third color temperature, CCT3, and a third color point, CP3, having a third x color coordinate x3 and a third y color coordinate y3.

[0011] The color point may refer to a point in the color space defined by the CIE 1931 color space, such as the CIE 1931 XYZ color space. The CIE 1931 color space defines quantitative links between distributions of wavelengths in the electromagnetic visible spectrum, and physiologically perceived colors in human color vision. Hence, a color point may have a definition in the color space CIE 1931, wherein the point may be specified by x and y color coordinates, respectively. This is a widely used practice.

[0012] Each of the CCT1, CCT2 and CCT3 is different from the other two of CCT1, CCT2 and CCT3, and CCT3 is at least 500 K, preferably at least 1000 K lower than each of CCT1 and CCT2. An advantage of the present invention is that off-BBL white control is simplified.

[0013] CPI is located below the black body locus, BBL, CP2 is located on or above the BBL and CP3 is located on, or below, or above the BBL.

[0014] It is to be understood that a color point being on the BBL is within 10 SDCM from the BBL, preferably within 7 SDCM from the BBL, more preferably within 5 SDCM from the BBL. A color point being below or above the BBL at least 10 SDCM away from the BBL, preferably at least 12 SDCM away from the BBL, more preferably at least 15 SDCM away from the BBL. The term “away” in the context of the present invention encompasses below or above.

[0015] Each of the xl, x2 and x3 is different by at least a value of 0,05, preferably at least 0.07, from the other two of xl, x2 and x3, and / or each of the yl, y2 and y3 is different by at least a value of 0,05, preferably at least 0.07 from the other two of yl, y2 and y3.

[0016] The LED filament lamp further comprises a control unit configured, in operation, to control the white LED filament arrangement light.

[0017] In other words, the present invention provides a LED filament lamp comprising a LED filament arrangement for emitting a white light output, and a control unit for controlling the white light output, wherein the LED filament arrangement comprises (i) a first LED filament component having a first LED light source for emitting a first white light component of a first correlated color temperature and a first color point, the first color point having a first x color coordinate and a first y color coordinate, (ii) a second LED filament component having a second LED light source for emitting a second white light component of a second correlated color temperature and a second color point, the second color point having a second x color coordinate and a second y color coordinate, and (iii) a third LED filament component having a third LED light source for emitting a third white light component of a third color temperature and a third color point, the third color point having a third x color coordinate and a third y color coordinate, wherein each of the first correlated color temperature, the second correlated color temperature and the third correlated color temperature is different from the other two, wherein the third correlated color temperature is at least 500 K lower than each of the first correlated color temperature and the second correlated color temperature, wherein the first color point is located below the black body locus, the second color point is located on or above the black body locus, and the third color point is located on, or below, or above the black body locus, a color point located on the black body locus being within 10 SDCM from the black body locus, a color point located below or above the black body locus being at least 10 SDCM away from the black body locus, and wherein each of the first x color coordinate, the second x color coordinate and the third x color coordinate is different from the other two by at least a value of 0,05, and / or each of the first y color coordinate, the second y color coordinate and the third y color coordinate is different from the other two by at least a value of 0,05.

[0018] The control unit may be configured to individually control the at least one first LED filament component, the at least one second LED filament component and the at least one third LED filament component. The obtained effect is an improved controllability of the white LED filament arrangement light.

[0019] By purposely positioning the first color point of the first white light component coming from the first LED light source at the aformentioned position below the black body locus, a LED filament lamp is obtained that is arranged to provide a white light output that can be tuned to have a color point in a region below the black body locus that would otherwise be inaccessible.

[0020] In this region, the white light output of the LED filament lamp has an improved quality in terms of color rendering, and in particular in terms of rendering of red (or reddish) colors.

[0021] An improved rendering of such colors is not only appreciated when mood lighting is needed, but it is also desirable for illuminating certain food products, such as meat.

[0022] Instead of incorporating additional light sources for accessing the aforementioned region below the black body locus, the inventors have realized that the color point of an already available white light source may instead be shifted to be sufficiently far below the black body locus.

[0023] Although this may come at the expense of efficiency, which is typically higher for color points on or (slightly) above the black body locus, it provides the desired improved rendering of particularly the red colors while not further complicating the construction of the LED filament lamp.

[0024] The term “control unit” as used herein is intended to mean a device, arrangement, element, or the like, which is configured to control first, second and third intensities of the light emitted from the first, the second and the third filament(s), respectively. The control of the control unit is performed according to one or more predetermined settings. The term “predetermined setting”, as used herein is intended to mean a setting, setup, program, relationship, or the like, which is set or determined in advance. The control unit may hereby control the total color temperature of the light emitted from the LED filament arrangement as a function of this or these predetermined setting(s).

[0025] In particular, CP2 may be located above the BBL. The obtained effect is an increased gamut area using three LED filament components allowing to have a higher variation of white LED filament arrangement light. Alternatively, CP2 may be located on the BBL and CP3 may be located on the BBL. The obtained effect is a gamut area using three LED filament components allowing to a variation of white LED filament arrangement light having a high red component, e.g. a higher CRI and / or R9 value. The LED filament arrangement may further comprise at least one fourth LED filament component comprising at least one fourth LED light source, the fourth LED filament component configured to, in operation, emit a fourth white light component having a fourth color temperature, CCT4, and a fourth color point, CP4, having a fourth x color coordinate x4 and a fourth y color coordinate y4. The obtained effect is an increased gamut area using four LED filament components allowing to have an even higher variation of white LED filament arrangement light.

[0026] In such an embodiment, CCT4 is at least 500 K, preferably at least 1000 K, lower than each of CCT1 and CCT2. Further, CCT3 may also be lower than each of CCT1 and CCT2. Further, the following inequality may be true: CCT1>CCT2>CCT3>CCT4. In other words, the first color temperature may have the greatest value, while the fourth color temperature may have the lowest value.

[0027] Further, the first color temperature CCT1 may be equal to the second color temperature CCT2, and / or the third color temperature CCT3 may be equal to the fourth color temperature CCT4.

[0028] The difference between CCT3 and CCT4 may be in the range of 300 K or less, preferably in the range of 200 K or less. Such an embodiment offers the advantage of improved variation of white LED filament arrangement light along an isotherm of the color diagram.

[0029] In particular, CCT1 may be at least 500 K, preferably at least 1000 K higher than CCT2. The obtained effect is an improved variation of white LED filament arrangement light along a more elongated gamut area in the color diagram.

[0030] The difference between CCT1 and CCT3 may be different from the difference between CCT2 and CCT4. In particular, the difference between CCT1 and CCT3 may be lower than the difference between CCT2 and CCT4, i.e. CCT1-CCT3<CCT2-CCT4. An advantage of this embodiment is a full coverage of off-BBL white control.

[0031] The distance between CPI and CP4 in the color diagram may be larger than the distance between CP2 and CP3. Such an embodiment offers the advantage of providing a trapezoid shaped color gamut area that matches the curved shape of the part of the BBL enclosed by the color gamut area.

[0032] CP3 is located on or above the BBL and CP4 is located below the BBL. In particular, CP3 may be located above the BBL. The obtained effect is a further increased gamut area using 4 LED filament components allowing to have an even higher variation of white LED filament arrangement light also close to and above the BBL. The LED filament lamp may comprises a first LED filament having a first elongated carrier, and a second LED filament having a second elongated carrier, the first and second LED filaments being separate LED filaments. The first LED filament comprises the first LED filament component and the second LED filament component, wherein the first LED light source and the second LED light source are arranged on the first elongated carrier. The second LED filament comprises the third LED filament component and optionally the fourth LED filament component, wherein the third LED light source and optionally the fourth LED light source are arranged on the second elongated carrier.

[0033] In such an embodiment, each of the first, second and third LED filaments comprises a separate carrier of elongated shape. The first, second, third, and optionally fourth, LED light sources typically each have a plurality of light emitting diodes, LEDs, arranged in array on the carrier and configured to emit respective LED light.

[0034] In particular, the LED filament arrangement may comprise a first LED filament comprising the first LED filament component and the second LED filament component. The LED filament arrangement may further comprise a second LED filament comprising the third LED filament component and optionally the fourth LED filament component. The first and second LED filaments are separate LED filaments, wherein the first LED light source, comprising an array of a plurality of first LEDs, and the second LED light source, comprising an array of a plurality of second LEDs, are arranged on a first elongated carrier of the first LED filament, and wherein the third LED light source, comprising an array of a plurality of third LEDs, and optionally the fourth LED light source, comprising an array of a plurality of fourth LEDs, are arranged on a second elongated carrier of the second LED filament.

[0035] The LED filaments may be arranged in a straight configuration or in a nonstraight configuration such as for example a curved configuration, a 2D / 3D spiral or a helix. Preferably, the LEDs are arranged on an elongated carrier like for instance a carrier, that may be rigid (made from, e.g., a polymer, glass, quartz, metal or sapphire) or flexible (e.g., made of a polymer or metal, e.g., a film or foil).

[0036] In case the carrier comprises a first major surface and an opposite second major surface, the LEDs are arranged on at least one of these surfaces. The carrier may be reflective or light transmissive, such as translucent and preferably transparent.

[0037] As used herein, the terms “carrier” and “elongated carrier” may be used interchangeably, such that the elongated carrier may also simply be denoted carrier. At least one of the LED filaments may comprise an encapsulant at least partly covering at least part of the plurality of LEDs. The encapsulant may also at least partly cover at least one of the first major surface and second major surface. The encapsulant may be a polymer material which may be flexible such as for example a silicone. The encapsulant may comprise a luminescent material for at least partially converting into converted light, LED light emitted by LEDs comprised in the respective LED light sources. The luminescent material may be a phosphor such as an inorganic phosphor and / or quantum dots or rods.

[0038] In particular, the encapsulant may partially convert first LED light emitted by first LEDs comprised in the first LED light source into first converted light, second LED light emitted by second LEDs comprises in the second LED light source into second converted light, and third LED light emitted by third LEDs comprised in the third LED light source into third converted light.

[0039] In such an embodiment, a combination of the first LED light and the first converted light provides the first white light component, a combination of the second LED light and the second converted light provides second the second white light component, and a combination of the third LED light and the third converted light provides the third white light component.

[0040] Alternatively, the LED filament arrangement may comprise at least one LED filament comprising the first LED filament component, the second LED filament component, and the third LED filament component, and optionally the fourth LED filament component.

[0041] In such an embodiment, the at least one LED filament has an elongated carrier, and the first LED light source (including, for example, an array of a plurality of first LEDs), the second LED light source (including, for example, an array of a plurality of second LEDs), the third LED light source (including, for example, an array of a plurality of third LEDs), and optionally the fourth LED light source, (including, for example, an array of a plurality of fourth LEDs) are arranged on the elongated carrier.

[0042] In other words, the first LED filament component, the second LED filament component, and the third LED filament component may be arranged on the same carrier of elongated shape, wherein an array of a plurality of light emitting diodes, LEDs, is arranged on the carrier and configured to emit respective LED light.

[0043] The LED filament arrangement may comprise a first LED filament comprising the at least one first LED filament component, a second LED filament comprising the at least one second LED filament component, a third LED filament comprising the at least one third LED filament component, and optionally a fourth LED filament comprising the fourth LED filament component.

[0044] In embodiments, the white light output of the LED filament arrangement may be varied from a first white light output to a second white light output, wherein the difference in correlated color temperature between the first and second white light outputs may be at least 1000 K, or at least 1500 K. For example, the correlated color temperature of the first white light output may be less than 2500 K and the correlated color temperature of the second white light output may be at least 4000 K.

[0045] The LED filament lamp according to the present invention may further comprise a light transmissive envelope at least partly enclosing the first, second and third filament components, and a base for electrically and mechanically connecting the LED filament lamp to a socket or a socket of a luminaire or a system.

[0046] It is noted that the invention relates to all possible combinations of features recited in the claims.

[0047] BRIEF DESCRIPTION OF THE DRAWINGS

[0048] This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention.

[0049] Fig. 1 shows a LED filament lamp according to the present invention;

[0050] Fig. 2 illustrates an arrangement of color points of the LED filament components according to the present invention;

[0051] Fig. 3 depicts a LED filament lamp according to another embodiment of the present invention;

[0052] Fig. 4 shows an arrangement of color points of the LED filament components depicted in Fig. 3;

[0053] Fig. 5a-5c illustrate the LED filament arrangement of Fig. 3.

[0054] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which currently preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and fully convey the scope of the invention to the skilled person. Fig. 1 shows a LED filament lamp 1 comprising a LED filament arrangement 1 ’ according to the present invention.

[0056] The LED filament arrangement L is configured to, in operation, emit a white light output.

[0057] The LED filament arrangement L comprises at least one first LED filament component 4 comprising at least one first LED light source, the first LED filament component 4 being configured to, in operation, emit a first white light component having a first correlated color temperature, CCT1, and a first color point, CPI, having first color coordinates xl and yl, respectively.

[0058] The LED filament arrangement L comprises at least one second LED filament component 5 comprising at least one second LED light source, the second LED filament component 5 being configured to, in operation, emit a second white light component having a second correlated color temperature, CCT2, and a second color point, CP2, having second color coordinates x2 and y2, respectively.

[0059] The LED filament arrangement L comprises at least one third LED filament component 6 comprising at least one third LED light source, the third LED filament component 6 being configured to, in operation, emit a third white light component having a third color temperature, CCT3, and a third color point, CP3, having third color coordinates x3 and y3, respectively.

[0060] Each of the CCT1, CCT2 and CCT3 is different from the other two of CCT1, CCT2 and CCT3, and CCT3 is at least 500 K, preferably at least 1000 K, lower than each of CCT1 and CCT2. An advantage of this embodiment is that off-BBL white control is simplified.

[0061] CPI, in Fig. 2 denoted 7, is located below the black body locus, BBL, CP2, referred to as 8, is located above the BBL and CP3, denoted as 9 is located on the BBL.

[0062] Each of the xl, x2 and x3 is different by at least a value of 0,05, preferably at least 0.07 from the other two of xl, x2 and x3, and / or each of the yl, y2 and y3 is different by at least a value of 0,05, preferably at least 0.07 from the other two of yl, y2 and y3.

[0063] The LED filament lamp 1 further comprises a control unit (not shown) configured to, in operation, control the white light output of the the LED filament arrangement. The control unit may be configured to individually control the at least one first LED filament component 4, the at least one second LED filament component 5, and the at least one third LED filament component 6. The LED filament arrangement 1’ comprises a first LED filament 2 comprising the first LED filament component 4 and the second LED filament component 5, and a second LED filament 3 comprising the third LED filament component 6. As is evident from Fig. 1, the first and second LED filaments 2, 3 are separate LED filaments.

[0064] In such an embodiment, each of the first and the second LED filaments 2, 3 comprises a separate carrier of elongated shape, wherein an array of a plurality of light emitting diodes, LEDs, is arranged on the carrier and configured to emit respective LED light. The LED filaments 2, 3 are arranged in a helical configuration.

[0065] Fig. 3 illustrates another embodiment of the LED filament lamp 101 according to the present invention. The LED filament lamp 101 comprises a LED filament arrangement 101’ comprising a first LED filament component 104, a second LED filament component 105, the third LED filament component 106, and a fourth LED filament component 106’.

[0066] The fourth LED filament component 106’ is configured to, in operation, emit fourth white light having a fourth color temperature, CCT4, and a fourth color point, CP4, having fourth color coordinates x4 and y4, respectively.

[0067] In such an embodiment, CCT4 is at least 500 K, preferably at least 1000 K lower than each of CCT1 and CCT2. Further, CCT3 may also be lower than each of CCT1 and CCT2. Further, the following inequality may be true: CCT1>CCT2>CCT3>CCT4. In other words, the first color temperature may have the greatest value, while the fourth color temperature may have the lowest value.

[0068] Further, the first color temperature CCT1 may be equal to the second color temperature CCT2, and / or the third color temperature CCT3 may be equal to the fourth color temperature CCT4.

[0069] The difference between CCT3 and CCT4 may be in the range of 300 K or less, preferably in the range of 200 K or less.

[0070] In particular, CCT1 may be at least 500 K, preferably at least 1000 K higher than CCT2.

[0071] The difference between CCT1 and CCT3 may be different from the difference between CCT2 and CCT4. In particular, the difference between CCT1 and CCT3 may be lower than the difference between CCT2 and CCT4, i.e. CCT1-CCT3<CCT2-CCT4. An advantage of this embodiment is a full coverage of off-BBL white control.

[0072] The LED filament arrangement 101’ comprises a first LED filament 102 comprising the first LED filament component 104 and the second LED filament component 105, and a second LED filament 103 comprising the third LED filament component 106 and the fourth LED filament component 106’. As is evident from Fig. 3, the first and second LED filaments 102, 103 are separate LED filaments.

[0073] In such an embodiment, each of the first and the second LED filaments 102, 103 comprises a separate carrier of elongated shape, wherein an array of a plurality of light emitting diodes, LEDs, is arranged on the carrier and configured to emit respective LED light. The LED filaments 102, 103 are arranged in a helical configuration.

[0074] As may be seen in Fig. 4, CPI and CP3 are located above the BBL (107 and 109), while CP2 and CP4 are located below the BBL (108 and 110).

[0075] The LED filament arrangement 101’ is shown in greater detail in Figs. 5a-5c.

[0076] In particular, when the first and the second LED filament components 104, 105 are operating, as shown in Fig. 5a, white LED filament arrangement light having high CCT is provided. On the other hand, when the third and the fourth LED filament components are operating, white LED filament arrangement light having low CCT is provided (Fig. 5b). Finally, if it is desired to obtain white LED filament arrangement light having medium CCT, all four LED filament components may be operating (Fig. 5c).

[0077] The person skilled in the art realizes that the present invention by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims.

[0078] Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage.

Claims

CLAIMS1. A LED filament lamp (1) comprising a LED filament arrangement (L) for emitting a white light output, and a control unit for controlling the white light output, wherein the LED filament arrangement (L) comprises: a first LED filament component (4) having a first LED light source for emitting a first white light component of a first correlated color temperature and a first color point, the first color point having a first x color coordinate and a first y color coordinate, a second LED filament component (5) having a second LED light source for emitting a second white light component of a second correlated color temperature and a second color point, the second color point having a second x color coordinate and a second y color coordinate, and a third LED filament component (6) having a third LED light source for emitting a third white light component of a third color temperature and a third color point, the third color point having a third x color coordinate and a third y color coordinate, wherein each of the first correlated color temperature, the second correlated color temperature and the third correlated color temperature is different from the other two, wherein the third correlated color temperature is at least 500 K lower than each of the first correlated color temperature and the second correlated color temperature, wherein the first color point is located below the black body locus, the second color point is located on or above the black body locus, and the third color point is located on, or below, or above the black body locus, a color point located on the black body locus being within 10 SDCM from the black body locus, a color point located below or above the black body locus being at least 15 SDCM away from the black body locus, and wherein each of the first x color coordinate, the second x color coordinate and the third x color coordinate is different from the other two by at least a value of 0,05, and / or each of the first y color coordinate, the second y color coordinate and the third y color coordinate is different from the other two by at least a value of 0,05.

2. The LED filament lamp (1) according to claim 1, wherein the second color point is located above the black body locus.

3. The LED filament lamp (1) according to claim 1, wherein the second color point is located on the black body locus, and wherein the third color point is located on the black body locus.

4. The LED filament lamp (101) according to claim 1, wherein the LED filament arrangement (101’) comprises a fourth LED filament component (106’) having a fourth LED light source for emitting a fourth white light component of a fourth correlated color temperature and a fourth color point, the fourth color point having a fourth x color coordinate and a fourth y color coordinate, wherein the fourth correlated color temperature is at least 500 K lower than each of the first correlated color temperature and the second correlated color temperature, wherein the third color point is located on or above the black body locus, and wherein the fourth color point is located below the black body locus.

5. The LED filament lamp (101) according to claim 4, wherein the third color point is located above the black body locus.

6. The LED filament lamp (101) according to any one of claims 4 and 5, wherein a difference between the third correlated color temperature and the fourth correlated color temperature is 300 K or less.

7. The LED filament lamp (1) according to any one of claims 4 to 6, wherein, in the color diagram, a distance between the first color point and the fourth color point is larger than a distance between the second color point and the third color point.

8. The LED filament lamp (101) according to any one of the preceding claims, wherein the first correlated color temperature is at least 500 K higher than the second correlated color temperature.

9. The LED filament lamp (1) according to any one of the preceding claims, wherein the control unit is configured to individually control the first LED filament component (4), the second LED filament component (5), and the third LED filament component (6).

10. The LED filament lamp (1) according to any one of the preceding claims, wherein the LED filament arrangement (L) comprises a first LED filament (2) having a first elongated carrier, and a second LED filament (3) having a second elongated carrier, the first and second LED filaments (2, 3) being separate LED filaments, wherein the first LED filament (2) comprises the first LED filament component (4) and the second LED filament component (5), the first LED light source and the second LED light source being arranged on the first elongated carrier, and wherein the second LED filament (3) comprises the third LED filament component (6) and optionally the fourth LED filament component (106’), the third LED light source and optionally the fourth LED light source being arranged on the second elongated carrier.

11. The LED filament lamp (1) according to any one of claims 1-9, wherein the LED filament arrangement (L) comprises at least one LED filament having an elongated carrier, wherein the at least one LED filament comprises the first LED filament component (4), the second LED filament component (5), the third LED filament component (6) and optionally the fourth LED filament component (106’), and wherein the first LED light source, the second LED light source, the third LED light source and optionally the fourth LED light source are arranged on the elongated carrier.

12. The LED filament lamp (1) according to claim 10 or 11, wherein each of the first LED light source, the second LED light source, the third LED light source, and optionally the fourth LED light source, comprises an encapsulant covering at least part of the respective elongated carriers.

13. The LED filament lamp (1) according to claim 12, wherein the encapsulant comprises a luminescent material for at least partially converting the first white LED light emitted by the at least one first LED light source into first converted light, second white LED light emitted by the at least one second LED light source into second converted light and third white LED light emitted by the at least one third LED light source into third converted light, and optionally said fourth white LED light emitted by the at least one fourth LED light source into fourth converted light.

14. The LED filament lamp (1) according to claim 1, wherein the LED filament arrangement (!’) comprises a first LED filament comprising the first LED filamentcomponent (4), a second LED filament comprising the second LED filament component (5), a third LED filament comprising the third LED filament component (6), and optionally a fourth LED filament comprising the fourth LED filament component (106’).

15. The LED filament lamp (1) according to any one of the preceding claims, further comprising a light transmissive envelope at least partly enclosing the first LED filament component (4), the second LED filament component (5), the third LED filament component (6), and optionally the fourth LED filament component (106’), and a base for electrically and mechanically connecting the LED filament lamp (1) to a socket of a luminaire.

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