A LED filament arrangement

Abstract

A LED filament arrangement (1) configured to provide, in operation, LED filament arrangement light, the LED filament arrangement comprising a first LED filament (2) configured to provide, in one or more operational modes, first white LED filament light having a first white luminous flux (LFW1) and red LED filament light having a red luminous flux (LFR), and comprising a plurality of first white LED light sources (21) and a plurality of first colored LED light sources (22) being arranged alternatingly on a first elongated substrate (23), a second LED filament (3) configured to provide, in one or more operational modes, second white LED filament light having a second white luminous flux (LFW2) and green LED filament light having a green luminous flux (LFG), wherein the second LED filament comprises a plurality of second white LED light sources (31) and a plurality of second colored LED light sources (32) arranged alternatingly on a second elongated substrate (33), a third LED filament (4) configured to provide, in one or more operational modes, third white LED filament light having a third white luminous flux (LFW3) and blue LED filament light having a blue luminous flux (LFB), wherein the third LED filament comprises a plurality of third white LED light sources (41) and a plurality of third colored LED light sources (42) being arranged alternatingly on a third elongated substrate (43), and a controller (5) configured to control the ratios LFW1 / LFR, LFW2 / LFG and LFW3 / LFB.

Description

[0001] 2025PF80072

[0002] 1

[0003] A LED FILAMENT ARRANGEMENT

[0004] FIELD OF THE INVENTION

[0005] The invention relates to a LED filament arrangement comprising a first LED filament, a second LED filament, and a third LED filament.

[0006] As used herein, the term “blue light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 430 nm to 490 nm.

[0007] As used herein, the term “green light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 500 nm to 560 nm.

[0008] As used herein, the term “red light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 620 to 680 nm.

[0009] As used herein, the term “white light” is intended to refer to light with correlated color temperature falling within the color temperature range of 2000 K to 9000 K, preferably in a correlated color temperature range of 2700 K to 6500 K.

[0010] As used herein, the term “warm white light” is intended to refer to light with a correlated color temperature falling within the color temperature range of 2000 K to 3500 K.

[0011] As used herein, the term “cool white light” is intended to refer to light with a correlated color temperature falling within the color temperature range of 3500 K to 6500 K.

[0012] As used herein, the term “anti-parallel” is intended to refer to electronic devices, typically LED filaments, connected in parallel but with their polarities reversed.

[0013] BACKGROUND OF THE INVENTION

[0014] A trend in lighting is LED filament lamps. A LED filament lamp is a lamp 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 LEDs.

[0015] Recently, a LED filament arrangement having a string of LED filaments which can provide RGB party light as well as white light has been introduced on the market. The architecture of this LED filament arrangement is based on White / Red, White / Green and White / Blue LED filaments, wherein each LED filament is based on a white and a colored sub LED filament arranged adjacent or next to each other.2025PF80072

[0016] 2

[0017] WO 2024 / 170456 Al discloses a LED filament arrangement comprising at least one first filament configured to, in operation, emit first light having a first correlated color temperature, CCT1, at least one second filament configured to, in operation, emit second light having a second correlated color temperature, CCT2, where CCT2 > CCT1, and at least one third filament configured to, in operation, emit third light having a third color temperature, CCT3, where CCT3 > CCT2, where each of the at least one first, second and third filament comprises a carrier of elongated shape, where a plurality of LEDs is arranged on the carrier, and a control unit. Only one type of LEDs are arranged on each filament.

[0018] It is desired to improve the (optical) performance and / or the appearance of LED filament arrangements.

[0019] SUMMARY OF THE INVENTION

[0020] It is an object of the present invention to overcome this problem, and to provide a LED filament arrangement with one or more of an improved performance, an improved optical performance, and an improved appearance.

[0021] According to a first aspect of the invention, this and other objects are achieved by means of a LED filament arrangement configured to provide, in operation, LED filament arrangement light, the LED filament arrangement comprising: a first LED filament configured to provide, in one or more operational modes, first white LED filament light having a first white luminous flux, LFW1, and red LED filament light having a red luminous flux, LFR, wherein the first LED filament comprises a plurality of first white LED light sources configured to, in operation, provide first white LED light source light, a plurality of first colored LED light sources configured to, in operation, provide red LED light source light, and a first elongated substrate, the plurality of first white LED light sources and the plurality of first colored LED light sources being arranged alternatingly on a major surface of the first elongated substrate, a second LED filament configured to provide, in one or more operation, second white LED filament light having a second white luminous flux, LFW2, and green LED filament light having a green luminous flux, LFG, wherein the second LED filament comprises a plurality of second white LED light sources configured to, in operation, provide second white LED light source light, a plurality of second colored LED light sources configured to, in operation, provide green LED light source light, and a second elongated substrate, the plurality of second white LED light sources and the plurality of second colored LED light sources being arranged alternatingly on a major surface of the second elongated substrate, a third LED filament configured to provide, in one or more operational modes,2025PF80072

[0022] 3

[0023] third white LED filament light having a third white luminous flux, LFW3, and blue LED filament light having a blue luminous flux, LFB, wherein the third LED filament comprises a plurality of third white LED light sources configured to, in operation, provide third white LED light source light, a plurality of third colored LED light sources configured to, in operation, provide blue LED light source light, and a third elongated substrate, the plurality of third white LED light sources and the plurality of third colored LED light sources being arranged altematingly on a major surface of the third elongated substrate, and a controller configured to control the ratios LFW1 / LFR, LFW2 / LFG and LFW3 / LFB, wherein each first white LED light source comprises at least one first blue LED chip and a first luminescent element, the first luminescent element comprising a first luminescent material, wherein each second white LED light source comprises at least one second blue LED chip and a second luminescent element, the second luminescent element comprising a second luminescent material, and wherein each third white LED light source comprises at least one third blue LED chip and a third luminescent element, the third luminescent element comprising a third luminescent material in the form of separated patterned luminescent dots.

[0024] Using this configuration, a LED filament arrangement light covering a larger and smaller color gamut, or in other words a lager color gamut range, is obtained. Compared to the prior art solutions such a LED filament arrangement is also slimmer, uses fewer LEDs and / or has an improved omnidirectional light distribution. Thereby, a LED filament arrangement with one or more of an improved performance, an improved optical performance, and an improved appearance is provided for.

[0025] Alternatively, instead of arranging the plurality of first white LED light sources and the plurality of first colored LED light sources altematingly, the plurality of first white LED light sources and the plurality of first colored LED light sources may be arranged next to each other, such as in two times a ID LED array.

[0026] Alternatively, instead of arranging the plurality of second white LED light sources and the plurality of second colored LED light sources altematingly, the plurality of second white LED light sources and the plurality of second colored LED light sources may be arranged next to each other, such as in two times a ID LED array.

[0027] Alternatively, instead of arranging the plurality of third white LED light sources and the plurality of third colored LED light sources altematingly, the plurality of third white LED light sources and the plurality of third colored LED light sources may be arranged next to each other, such as in two times a ID LED array.2025PF80072

[0028] 4

[0029] Alternatively, the plurality of first white LED light sources and the plurality of first colored LED light sources may be arranged as follows: (W-R)n or (WWR)n or (RRW) or combinations thereof.

[0030] Alternatively, the plurality of second white LED light sources and the plurality of second colored LED light sources may be arranged as follows: (W-R)n or (WWR)n or (RRW) or combinations thereof.

[0031] Alternatively, the plurality of third white LED light sources and the plurality of third colored LED light sources may be arranged as follows: (W-R)n or (WWR)n or (RRW) or combinations thereof.

[0032] In an optional mode of operation of the LED filament arrangement the LED filament arrangement light may be white light having a correlated color temperature in a range from 2000K to 6500K and a color rendering index of at least 80.

[0033] In another optional mode of operation of the LED filament arrangement the LED filament arrangement light may be red light.

[0034] In yet another optional mode of operation of the LED filament arrangement the LED filament arrangement light may be green light.

[0035] In yet another optional mode of operation of the LED filament arrangement the LED filament arrangement light may be blue light.

[0036] The ratio LFW 1 / LFR may be varied at least 10 %, or at least 40 %, such as at least 70 %, or at least 90 %.

[0037] The ratio LFW2 / LFG may be varied at least 10 %, or at least 40 %, such as at least 70 %, or at least 90 %.

[0038] The ratio LFW3 / LFB may be varied at least 10 %, or at least 40 %, such as at least 70 %, or at least 90 %.

[0039] The first luminescent elements may be separated elements, e.g., forming a pattern, or may form a single element.

[0040] The at least one first blue LED chip may be configured to provide, in operation, first blue LED chip light having a peak emission wavelength in a wavelength range from 420 nm to 490 nm, wherein the first luminescent material may be configured to at least partly convert the first blue LED chip light into first converted light having a peak emission wavelength in a wavelength range from 500 nm to 670 nm, the first white LED filament light comprises the first converted light and optionally part of the first blue LED chip light.2025PF80072

[0041] 5

[0042] The second luminescent elements may be separated elements, e.g., forming a pattern, or may form a single element.

[0043] The at least one second blue LED chip may be configured to provide, in operation, second blue LED chip light having a peak emission wavelength in a wavelength range from 420 nm to 490 nm, wherein the second luminescent material may be configured to at least partly convert the second blue LED chip light into second converted light having a peak emission wavelength in a wavelength range from 500 nm to 670 nm, the second white LED filament light comprises the second converted light and optionally part of the second blue LED chip light.

[0044] The third luminescent elements may be separated elements, e.g., forming a pattern, or may form a single element.

[0045] The at least one first blue LED chip may be configured to provide, in operation, first blue LED chip light having a peak emission wavelength in a wavelength range from 420 nm to 490 nm, wherein the third luminescent material may be configured to at least partly convert the third blue LED chip light into third converted light having a peak emission wavelength in a wavelength range from 500 nm to 670 nm, the third white LED filament light comprises the third converted light and optionally part of the third blue LED chip light.

[0046] The second luminescent material may be in the form of separated patterned luminescent dots. It is noted that in principle when (i) the second luminescent material comprises a red phosphor of the ‘KSiF’ type and (ii) the ‘green LED light’ has a wavelength larger than the excitation wavelength range of the green phosphor which is comprised by the second luminescent material, then a second luminescent material in the form of dots is not needed.

[0047] A combination of the first luminescent elements may be in the form of first separated patterned luminescent dots, wherein a combination of the second luminescent elements may be in the form of second separated patterned luminescent dots, wherein a combination of the third luminescent elements may be in the form of third separated patterned luminescent dots, wherein each of the first luminescent dots comprises first greenyellow phosphor particles and first red phosphor particles, wherein each of the second luminescent dots comprise second green-yellow phosphor particles and second red phosphor particles, and wherein each of the third luminescent dots comprise third green-yellow phosphor particles and third red phosphor particles.2025PF80072

[0048] 6

[0049] Thereby, a LED filament arrangement with one or more of a further improved performance and a further improved optical performance is provided for.

[0050] The controller may further be configured to individually control the first LED filament, the second LED filament and the third LED filament.

[0051] The controller may further be configured to individually control the first LED filament such that the ratio LFW1 / LFR can be individually varied, the second LED filament such that the ratio LFW2 / LFG can be individually varied, and the third LED filament such that the ratio LFW3 / LFB can be individually varied.

[0052] Thereby, it becomes possible to adapt the obtained LED filament arrangement light to various different applications and to the light requirements thereof. For instance, it becomes possible to control the correlated color temperature, CCT, and the color rendering index, CRI of the device light.

[0053] The LED filament arrangement may further comprise a first encapsulant configured to, at least partly, shield or protect the plurality of first white LED light sources and the plurality of first colored LED light sources.

[0054] The LED filament arrangement may further comprise a second encapsulant configured to, at least partly, shield or protect the plurality of second white LED light sources and the plurality of second colored LED light sources.

[0055] The LED filament arrangement may further comprise a third encapsulant configured to, at least partly, shield or protect the plurality of third white LED light sources and the plurality of third colored LED light sources.

[0056] One or more of the first encapsulant, the second encapsulant and the third encapsulant may be a diffusing encapsulant.

[0057] By providing such an encapsulant, crosstalk between the LEDs of each respective LED filament can be reduced.

[0058] The plurality of first white LED light sources and the plurality of first colored LED light sources may be arranged such that neighboring LED light sources are arranged with a first spacing, dl, being larger than at least a size, W22, of the first colored LED light sources, such as for instance at least 1.5 times or at least 2 times W22.

[0059] Alternatively, or additionally, the plurality of second white LED light sources and the plurality of second colored LED light sources may be arranged such that neighboring LED light sources are arranged with a second spacing, d2, being larger than at least a size, W32 of the second colored LED light sources, such as for instance at least 1.5 times or at least 2 times W32.2025PF80072

[0060] 7

[0061] Alternatively, or additionally, the plurality of third white LED light sources and the plurality of third colored LED light sources are arranged such that neighboring LED light sources are arranged with a third spacing, d3, being larger than at least a size, W42, of the third colored LED light sources, such as for instance at least 1.5 times or at least 2 times W42.

[0062] It is noted that in this context the size W22, W32, W42, may be defined as the length (or largest extension) of the epitaxial layer of the chip.

[0063] By providing such a first spacing, second spacing and / or third spacing, crosstalk between the LEDs of each respective LED filament can be reduced.

[0064] A size, W21, of the first blue LED chip of the first white LED light sources may be larger than a size, W22, of a first colored LED chip of the first colored LED light sources e.g. by at least 50 pm or at least 100 pm.

[0065] Alternatively, or additionally, a size, W31, of the second blue LED chip of the second white LED light sources may be larger than a size, W32, of a second colored LED chip of the second colored LED light sources e.g. by at least 50 pm or at least 100 pm.

[0066] Alternatively, or additionally, a size, W41, of the third blue LED chip of the third white LED light sources may be larger than a size, W42, of a third colored LED chip of the third colored LED light sources e.g. by at least 50 pm or at least 100 pm.

[0067] By providing LEDs with such sizes, crosstalk between the LEDs of each respective LED filament can be reduced.

[0068] The first colored LED light sources may be direct-emitting colored LED light sources being free from luminescent material.

[0069] Alternatively, or additionally, the second colored LED light sources may be direct-emitting colored LED light sources being free from luminescent material.

[0070] Alternatively, or additionally, the third colored LED light sources may be direct-emitting colored LED light sources being free from luminescent material.

[0071] By providing direct-emitting colored LEDs, crosstalk between the LEDs of each respective LED filament can be reduced.

[0072] The first luminescent material may be a luminescent material which is not excited by the red LED light source light.

[0073] Alternatively, or additionally, the second luminescent material may be a luminescent material which is not excited by the green LED light source light.

[0074] Alternatively, or additionally, the third luminescent material may be a luminescent material which is not excited by the blue LED light source light.2025PF80072

[0075] 8

[0076] It is noted that as used herein, the term “not excited” is intended to mean that less than 5 % or less than 3 % of the (incident) light, here the red LED light source light, the green LED light source light or the blue LED light source light, is converted by the (respective) luminescent material.

[0077] By providing such luminescent materials, crosstalk between the LEDs of each respective LED filament can be reduced.

[0078] The first LED filament may be arranged in a first envelope, the second LED filament may be arranged in a second envelope, the third LED filament may be arranged in a third envelope, and the first envelope, the second envelope and the third envelope may be mutually separate envelopes.

[0079] Thereby, the first, second and third LED filament may be protected by the envelope against external influences, which may otherwise have a deteriorating effect on the filament.

[0080] The first LED filament, the second LED filament, and the third LED filament may be arranged in a common envelope.

[0081] Thereby a simple and robust LED filament arrangement is provided for.

[0082] The first LED filament, the second LED filament, and the third LED filament may be arranged in an anti-parallel electrical configuration.

[0083] Alternatively, the first LED filament, the second LED filament, and the third LED filament may be arranged in a parallel electrical configuration.

[0084] At least one of the following may apply: (i) the plurality of first white LED light sources and plurality of first colored LED light sources may be arranged in an anti-parallel electrical configuration; (ii) the plurality of second white LED light sources and plurality of second colored LED light sources may be arranged in an anti-parallel electrical configuration; and (iii) the plurality of third white LED light sources and plurality of third colored LED light sources may be arranged in an anti-parallel electrical configuration.

[0085] Alternatively, one or more of the following may apply: (i) the plurality of first white LED light sources and plurality of first colored LED light sources may be arranged in a parallel electrical configuration; (ii) the plurality of second white LED light sources and plurality of second colored LED light sources may be arranged in a parallel electrical configuration; and (iii) the plurality of third white LED light sources and plurality of third colored LED light sources may be arranged in a parallel electrical configuration.

[0086] Thereby, simple and straight forward control of the respective LED filaments becomes possible.2025PF80072

[0087] 9

[0088] The first colored LED light sources, the second colored LED light sources, the third colored LED light sources and the controller is configured such that, in a first operational mode, white light with a correlated color temperature, CCT, being identical to the correlated color temperature, CCT, of the first white LED light source light, the second white LED light source light, and / or the third white LED light source light is provided.

[0089] It is noted that as used herein in connection with correlated color temperatures, CCT, the term “identical” is intended to mean within 300 K.

[0090] This may be obtained by controlling the ratios LFW1 / LFR, LFW2 / LFG and LFW3 / LFB such as to keep the CCT constant. Thereby, colored (whitish) LED filament arrangement light can be obtained.

[0091] The first colored LED light sources, the second colored LED light sources, the third colored LED light sources and the controller is configured such that, in a second operational mode, white light with a correlated color temperature, CCT, being different from one or more of the correlated color temperature, CCT, of the first white LED light source light, the second white LED light source light and the third white LED light source light by at least 400 K, or at least 500 K, is provided.

[0092] This may be obtained by controlling the ratios LFW1 / LFR, LFW2 / LFG and LFW3 / LFB such as to vary the relative contributions of the RGB light and the white light. Thereby, the CCT can be altered. By controlling the ratios LFW1 / LFR, LFW2 / LFG and LFW3 / LFB differently, the black body locus, BBL, can even be followed, for instance in a non-linear mode.

[0093] The first LED filament may be electrically connected to a first electrical connection element, the second LED filament may be electrically connected to a second electrical connection element, the third LED filament may be electrically connected to a third electrical connection element, and the first electrical connection element, the second electrical connection element and the third electrical connection element may be mutually separate electrical connection elements.

[0094] The first electrical connection element, the second electrical connection element and the third electrical connection element may for instance be electrically isolated from one another.

[0095] The first electrical connection element, the second electrical connection element and the third electrical connection element may for instance be a cap or base which can be electrically and mechanically connected to a socket (such as a socket of a luminaire).2025PF80072

[0096] 10

[0097] Thereby, the first, second and third LED filament may be supplied individually with electrical energy, which contributes to effective individual control of the first, second and third LED filament.

[0098] Alternatively, the first LED filament, the second LED filament, and the third LED filament may be electrically connected to one common electrical connection element.

[0099] The common electrical connection element may for instance be a cap or base which can be electrically and mechanically connected to a socket (such as a socket of a luminaire).

[0100] Thereby, a LED filament arrangement with a simple and more robust structure is provided for.

[0101] The invention further relates to one or more LED filament lamp comprising a LED filament arrangement according to the invention.

[0102] The LED filament lamp may further comprise a light transmissive envelope at least partly enclosing the LED filament arrangement and a base for electrically and mechanically connecting the LED filament lamp to a socket or a socket of a luminaire.

[0103] The invention still further relates to one or more luminaire comprising a LED filament lamp according to the invention.

[0104] The invention still further relates to one or more luminaire comprising a LED filament arrangement according to the invention.

[0105] It is noted that the invention relates to all possible combinations of features recited in the claims.

[0106] BRIEF DESCRIPTION OF THE DRAWINGS

[0107] 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.

[0108] Fig. 1 shows a schematical top view of a LED filament arrangement according to the invention and comprising a first LED filament, a second LED filament and a third LED filament.

[0109] Fig. 2A shows a cross-sectional side view of the LED filament arrangement according to Fig. 1 seen at the line IIA in Fig. 1.

[0110] Fig. 2B shows a cross-sectional side view of the LED filament arrangement according to Fig. 1 seen at the line IIB in Fig. 1.

[0111] Fig. 3 shows a color space diagram showing a line indicating the black body locus, BBL, and the correlated color temperature, CCT, of white light emitted by a light2025PF80072

[0112] 11

[0113] emitting arrangement according to the invention, as well as a triangle indicating colors of colored light emitted by a light emitting arrangement according to the invention.

[0114] Figs. 4A to 4C show schematic side views of a first LED filament of a light emitting arrangement according to the invention illustrating further details of the first LED filament.

[0115] Figs. 5A to 5C show schematic side views of a second LED filament of a light emitting arrangement according to the invention illustrating further details of the second LED filament.

[0116] Figs. 6A to 6C show schematic side views of a third LED filament of a light emitting arrangement according to the invention illustrating further details of the third LED filament.

[0117] Fig. 7 shows a schematical top view of another LED filament arrangement according to the invention.

[0118] Fig. 8 shows a schematical top view of another LED filament arrangement according to the invention.

[0119] Fig. 9 shows a schematical side view of a lamp comprising a LED filament arrangement according to the invention.

[0120] Fig. 10 shows a schematical side view of a luminaire comprising a lamp and a LED filament arrangement according to the invention.

[0121] As illustrated in the figures, the sizes of layers and regions are exaggerated for illustrative purposes and, thus, are provided to illustrate the general structures of embodiments of the present invention. Like reference numerals refer to like elements throughout.

[0122] DETAILED DESCRIPTION

[0123] 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.

[0124] Fig. 1 shows a schematical top view of a LED filament arrangement 1 according to the invention. Fig. 2A shows a cross-sectional side view of the LED filament2025PF80072

[0125] 12

[0126] arrangement 1 seen at the line IIA in Fig. 1. Fig. 2B shows a cross-sectional side view of the LED filament arrangement 1 seen at the line IIB in Fig. 1.

[0127] The LED filament arrangement 1 is configured to provide, in operation, LED filament arrangement light 10. Generally, and irrespective of the embodiment, the LED filament arrangement 1 comprises a first LED filament 2, a second LED filament 3, and a third LED filament 4.

[0128] The first LED filament 2 is configured to provide, in one or more operational modes, first white LED filament light 20a having a first white luminous flux LFW 1 and red LED filament light 20b having a red luminous flux LFR. The first LED filament 2 comprises a plurality of first white LED light sources 21. The plurality of first white LED light sources 21 are configured to, in operation, provide first white LED light source light 210. The first white LED filament light 20a comprises the combined first white LED light source light 210 of the plurality of first white LED light sources 21. The first LED filament 2 further comprises a plurality of first colored LED light sources 22. The first colored LED light sources 22 are configured to, in operation, provide red LED light source light 220. The red LED filament light 20b comprises the combined red LED light source light 220 of the plurality of first colored LED light sources 22.

[0129] The first LED filament 2 further comprises a first elongated substrate 23. The first elongated substrate 23 comprises a first major surface 230 and a second major surface 231 opposite to the first major surface 230 (cf. Figs. 2 A and 2B). The plurality of first white LED light sources 21 and the plurality of first colored LED light sources 22 are arranged alternatingly on a major surface 230, 231, as shown on the first major surface 230, of the first elongated substrate 23.

[0130] The second LED filament 3 is configured to provide, in one or more operation, second white LED filament light 30a having a second white luminous flux LFW2 and green LED filament light 30b having a green luminous flux LFG. The second LED filament comprises a plurality of second white LED light sources 31. The plurality of second white LED light sources 31 are configured to, in operation, provide second white LED light source light 310. The second white LED filament light 30a comprises the combined second white LED light source light 310 of the plurality of second white LED light sources 31. The second LED filament 3 further comprises a plurality of second colored LED light sources 32. The plurality of second colored LED light sources 32 are configured to, in operation, provide green LED light source light 320. The green LED filament light 30b comprises the combined green LED light source light 320 of the plurality of second colored LED light sources 32.2025PF80072

[0131] 13

[0132] The second LED filament 3 further comprises a second elongated substrate 33. The second elongated substrate 33 comprises a third major surface 330 and a fourth major surface 331 opposite to the third major surface 330 (cf. Figs. 2A and 2B). The plurality of second white LED light sources 31 and the plurality of second colored LED light sources 32 are arranged alternatingly on a major surface 330, 331, as shown on the third major surface 330, of the second elongated substrate 33.

[0133] The third LED filament 4 is configured to provide, in one or more operational modes, third white LED filament light 40a having a third white luminous flux LFW3 and blue LED filament light 40b having a blue luminous flux LFB. The third LED filament comprises a plurality of third white LED light sources 41. The plurality of third white LED light sources 41 are configured to, in operation, provide third white LED light source light 410. The third white LED filament light 40a comprises the combined third white LED light source light 410 of the plurality of third white LED light sources 41. The third LED filament 4 further comprises a plurality of third colored LED light sources 42. The plurality of third colored LED light sources 42 are configured to, in operation, provide blue LED light source light 420. The blue LED filament light 40b comprises the combined blue LED light source light 420 of the plurality of third colored LED light sources 42.

[0134] The third LED filament 4 further comprises a third elongated substrate 43. The third elongated substrate 43 comprises a fifth major surface 430 and a sixth major surface 431 opposite to the fifth major surface 430 (cf. Figs. 2A and 2B). The plurality of third white LED light sources 41 and the plurality of third colored LED light sources 42 are arranged alternatingly on a major surface 430, 440, as shown on the fifth major surface 430, of the third elongated substrate 43.

[0135] The LED filament arrangement light 10 comprises a combination of the first white LED filament light 20a, the red LED filament light 20b, the second white LED filament light 30a, the green LED filament light 30b, the third white LED filament light 40a, and the blue LED filament light 40b.

[0136] Referring specifically to Fig. 2A, each first white LED light source 21 comprises at least one first blue LED chip 211 and a first luminescent element 212. The first luminescent element comprises a first luminescent material 213. The first luminescent material 213 comprises a first green-yellow phosphor and a first red phosphor. Optionally, the first luminescent material 213 is in the form of separated patterned luminescent dots, in which case the first luminescent dots comprise first green-yellow phosphor particles and first red phosphor particles. The first luminescent material 213 may be a luminescent material2025PF80072

[0137] 14

[0138] which is not excited by the red LED light source light. Suitable luminescent materials will be described further below. The at least one first blue LED chip 211 is configured to, in operation, emit first blue LED chip light 2110. The first luminescent element 212 is configured to convert the first blue LED chip light 2110 into first white LED light source light 210.

[0139] Likewise, each second white LED light source 31 comprises at least one second blue LED chip 311 and a second luminescent element 312. The second luminescent element comprises a second luminescent material 313. The second luminescent material 313 comprises a second green-yellow phosphor and a second red phosphor. Optionally, the second luminescent material 313 is in the form of separated patterned luminescent dots, in which case the second luminescent dots comprise second green-yellow phosphor particles and second red phosphor particles. The second luminescent material 313 may be a luminescent material which is not excited by the green LED light source light. Suitable luminescent materials will be described further below. The at least one second blue LED chip 311 is configured to, in operation, emit second blue LED chip light 3110. The second luminescent element 312 is configured to convert the second blue LED chip light 3110 into second white LED light source light 310.

[0140] Also, each third white LED light source 41 comprises at least one third blue LED chip 411 and a third luminescent element 412. The third luminescent element comprises a third luminescent material 413 in the form of separated patterned luminescent dots. The third luminescent material 413 comprise third green-yellow phosphor particles and third red phosphor particles. The third luminescent material 413 is a luminescent material which is not excited by the blue LED light source light. Suitable luminescent materials will be described further below. The at least one third blue LED chip 411 is configured to, in operation, emit third blue LED chip light 4110. The third luminescent element 412 is configured to convert the third blue LED chip light 4110 into third white LED light source light 410.

[0141] Referring now specifically to Fig. 2B, each first colored LED light source 22 comprises at least one first colored LED chip 221. The first colored LED chip 221 is a red LED chip. The first colored LED light sources 22 are direct-emitting colored LED light sources. The first colored LED light sources 22 are free from luminescent material.

[0142] Likewise, each second colored LED light source 32 comprises at least one second colored LED chip 321. The second colored LED chip 321 is a green LED chip. The second colored LED light sources 32 are direct-emitting colored LED light sources. The second colored LED light sources 32 are free from luminescent material.2025PF80072

[0143] 15

[0144] Also, each third colored LED light source 42 comprises at least one third colored LED chip 421. The third colored LED chip 421 is a blue LED chip. The third colored LED light sources 42 are direct-emitting colored LED light sources. The third colored LED light sources 42 are free from luminescent material.

[0145] Referring again to Fig. 1, the LED filament arrangement 1 further comprises a controller 5. The controller 5 is configured to control the ratios LFW1 / LFR, LFW2 / LFG and LFW3 / LFB. The controller 5 is further optionally configured to individually control the first LED filament 2, the second LED filament 3 and the third LED filament 4.

[0146] The first colored LED light sources 22, the second colored LED light sources 32, the third colored LED light sources 42, and the controller 5 may be configured such that in a first operational mode, the red LED filament light 20b, the green LED filament light 30b, and the blue LED filament light 40b in combination forms white light with a correlated color temperature, CCT, being identical to the correlated color temperature, CCT, of the first white LED light source light 210, the second white LED light source light 310, and / or the third white LED light source light 410.

[0147] Alternatively, the first colored LED light sources 22, the second colored LED light sources 32, the third colored LED light sources 42, and the controller 5 is configured such that in the first operational mode, the red LED filament light 20b, the green LED filament light 30b, and the blue LED filament light 40b in combination forms white light with a correlated color temperature, CCT, being different from the correlated color temperature, CCT, of the first white LED light source light 210, the second white LED light source light 310 and / or the third white LED light source light 410 by at least 500 K is provided.

[0148] Fig. 3 shows a color space diagram showing a line indicating the black body locus, BBL, and the correlated color temperature, CCT, of exemplary white light emitted by a light emitting arrangement according to the invention, and a triangle indicating possible color points (xl, yl) of exemplary white light and exemplary colored light emitted by a light emitting arrangement according to the invention. As may be seen from Fig. 3, by using a LED filament arrangement 1 according to the invention, LED filament arrangement light 10 covering larger and smaller color gamut, or in other words a lager color gamut range, can be obtained.

[0149] Figs. 4A to 4C show schematic side views of a first LED filament 2 and illustrating further details of the first LED filament 2.2025PF80072

[0150] 16

[0151] Referring to Fig. 4A, the first LED filament here comprises a first encapsulant 24. The first encapsulant 24 is configured to, at least partly, shield the plurality of first white LED light sources 21 and the plurality of first colored LED light sources 22.

[0152] Referring to Fig. 4B, each first colored LED light source 22 of the plurality of first colored LED light sources 22 comprises a size. Each first colored LED light source 22 of the plurality of first colored LED light sources 22 further comprises a first colored LED chip 221 with a size W22. The plurality of first white LED light sources 21 and the plurality of first colored LED light sources 22 are arranged such that neighboring LED light sources are arranged with a first spacing dl. The first spacing dl is larger than at least the size of each of the first colored LED light source 22, or larger than at least the size W22 of each of the first colored LED chips 221.

[0153] Referring to Fig. 4C, the first blue LED chip 211 of each first white LED light source 21 of the plurality of first white LED light sources 21 comprises a size W21. The size W21 of the first blue LED chip 211 is larger than the size W22 of the first colored LED chip 221 of the first colored LED light sources 22 e.g. by at least 50 pm or at least 100 pm.

[0154] A first LED filament 2 employing one or more of the above described details as shown in Figs. 4A, 4B and 4C may be envisaged.

[0155] Figs. 5A to 5C show schematic side views of a second LED filament 3 and illustrating further details of the second LED filament 3.

[0156] Referring to Fig. 5A, the second LED filament 3 comprises a second encapsulant 34. The second encapsulant 34 is configured to, at least partly, shield the plurality of second white LED light sources 31 and the plurality of second colored LED light sources 32.

[0157] Referring to Fig. 5B, each second colored LED light source 32 of the plurality of second colored LED light sources 32 comprises a size. Each second colored LED light source 32 of the plurality of second colored LED light sources 32 further comprises a second colored LED chip 321 with a size W32. The plurality of second white LED light sources 31 and the plurality of second colored LED light sources 32 are arranged such that neighboring LED light sources are arranged with a second spacing d2. The second spacing d2 is larger than at least the size of each of the second colored LED light sources 32, or larger than at least the size W32 of each of the second colored LED chips 321.

[0158] Referring to Fig. 5C, the second blue LED chip 311 of each second white LED light source 31 of the plurality of second white LED light sources 31 comprises a size W31. The size W31 of the second blue LED chip 311 is larger than the size W32 of the second2025PF80072

[0159] 17

[0160] colored LED chip 321 of the second colored LED light sources 32 e.g. by at least 50 pm or at least 100 pm.

[0161] A second LED filament 3 employing one or more of the above described details as shown in Figs. 5A, 5B and 5C may be envisaged.

[0162] Figs. 6A to 6C show schematic side views of a third LED filament 4 and illustrating further details of the third LED filament 4.

[0163] Referring to Fig. 6A, the third LED filament 4 comprises a third encapsulant 44. The third encapsulant 44 is configured to, at least partly, shield the plurality of third white LED light sources 41 and the plurality of third colored LED light sources 42.

[0164] Referring to Fig. 6B, each third colored LED light source 42 of the plurality of third colored LED light sources 42 comprises a size. Each third colored LED light source 42 of the plurality of third colored LED light sources 42 further comprises a third colored LED chip 421 with a size W42. The plurality of third white LED light sources 41 and the plurality of third colored LED light sources 42 are arranged such that neighboring LED light sources are arranged with a third spacing d3. The third spacing d3 is larger than at least the size of each of the third colored LED light sources 42, or larger than at least the size W42 of each of the third colored LED chips 421.

[0165] Referring to Fig. 6C, the third blue LED chip 411 of each third white LED light source 41 of the plurality of third white LED light sources 41 comprises a size W41. The size W41 of the third blue LED chip 411 is larger than the size W42 of the third colored LED chip 421 of the third colored LED light sources 42 e.g. by at least 50 pm or at least 100 pm.

[0166] A third LED filament 4 employing one or more of the above described details as shown in Figs. 6A, 6B and 6C may be envisaged.

[0167] Fig. 7 shows a schematical top view of a LED filament arrangement 100 according to the invention. The LED filament arrangement 100 differs from the LED filament arrangement 1 shown I Fig. 1 and described above in virtue of the following.

[0168] The first LED filament 2 is arranged in a first envelope 25. The second LED filament 3 is arranged in a second envelope 35. The third LED filament 4 is arranged in a third envelope 45. The first envelope 25, the second envelope 35, and the third envelope 45 are mutually separate envelopes.

[0169] The first LED filament 2 comprises a first electrical connection element 26. The second LED filament 3 comprises a second electrical connection element 36. The third LED filament 4 comprises a third electrical connection element 46. The first electrical2025PF80072

[0170] 18

[0171] connection element 26, the second electrical connection element 36, and the third electrical connection 46 element are mutually separate electrical connection elements.

[0172] Fig. 8 shows a schematical top view of a LED filament arrangement 101 according to the invention. The LED filament arrangement 101 differs from the LED filament arrangements 1 and 100 shown in Figs. 1 and 7 and described above in virtue of the following.

[0173] The first LED filament 2, the second LED filament 3, and the third LED filament 4 are arranged in an envelope 7. The envelope 7 is one common envelope 7.

[0174] The first LED filament 2, the second LED filament 3, and the third LED filament 4 comprises an electrical connection element 8. The electrical connection element 8 is one common electrical connection element 8.

[0175] Furthermore, in any of the above described embodiments, the first LED filament 2, the second LED filament 3, and the third LED filament 4 may be arranged in an anti-parallel electrical configuration. Alternatively, the first LED filament 2, the second LED filament 3, and the third LED filament 4 may be arranged in a parallel electrical configuration.

[0176] Fig. 9 shows an exemplary lamp 300 comprising a LED filament arrangement 1, 100, 101 according to any embodiment of the invention. In the embodiment shown, the LED filament arrangement 1, 100, 101 comprises a substantially straight LED filament arrangement. The LED filament arrangement of such a lamp may in other embodiments be a LED filament arrangement with another shape, such as, but not limited to, spiral-shaped, helix-shaped, meandering, twisted, flat and combinations thereof.

[0177] The lamp 300 further comprises a driver or controller 305 configured for controlling the first, second and third LED filament 2, 3, 4 of the LED filament arrangement 1, 100, 101. The controller 305 is configured to power the first, second and third LED filament 2, 3, 4 via electrical circuitry (not visible on the figures, but may be attached to the first, second and third electrical connection element 26, 36, 46) of the LED filament arrangement 1, 100, 101. The LED filament arrangement 1, 100, 101 may also comprise a controller 5, which may or may not be separate from the controller 305. In other words, the controller 305 and the controller 5 of the LED filament arrangement 1, 100, 101 may be integrated into one and the same driver or controller, or they may be mutually separate units.

[0178] The lamp 300 further comprises an envelope 301 at least partially enveloping the at least one LED filament arrangement 1, 100, 101. The lamp 300 further comprises a cap 303. As shown in Fig. 9, the controller 305 is arranged within the envelope 301. When2025PF80072

[0179] 19

[0180] comprising a cap 303, the controller 305 may also be arranged inside the cap 303 such that it is hidden from view. The lamp 300 further comprises threading 302 for connection to a socket, and a terminal 304 for connection to a source of electrical energy.

[0181] The envelope 301 of the lamp 300 may further and optionally be provided with a coating (not shown), such as a reflective coating, covering at least a part of the envelope 301.

[0182] Turning finally to Fig. 10, another exemplary luminaire in the form of a pendant 400 is shown. The pendant 400 comprises a LED filament arrangement 1, 100, 101 according to any embodiment of the invention. The LED filament arrangement 1, 100, 101 is as shown in Fig. 10 provided within a lamp 300 in the form of a light bulb. The LED filament arrangement 1, 100, 101 as shown in Fig. 10 comprises a substantially straight LED filament arrangement.

[0183] As is also mentioned above, the light bulb further comprises a transparent envelope (cf. transparent envelope 301 of lamp 300) at least partially enveloping the at least one LED filament arrangement 1, 100, 101. The transparent envelope may be shaped in any feasible shape, for example such as to resemble the shape of any one of a standard light bulb, a globe light bulb, a candlelight bulb, a customized light bulb and even a spiral light bulb. The transparent envelope may comprise a luminescent material. The transparent envelope may be a glass envelope.

[0184] The pendant 400 further comprises a socket 401 for connecting the lamp 300, and thereby the LED filament arrangement 1, 100, 101, to the pendant 400. The socket 401 is adapted to cooperate with the base 303 of the lamp 300. The socket 401 may comprise a threading adapted to cooperate with the threading 302 of the lamp 300. The socket 401 may comprise a terminal adapted to cooperate with the terminal 304 of the lamp 300. The pendant 400 further comprises a reflector or screen 403.

[0185] The pendant 400 may further comprise a driver 402 configured for controlling the LED filament arrangement 1, 100, 101. The driver 402 may or may not be the same unit as the controller 305 described above. In other words, the driver 402 and the controller 305 may be integrated into one and the same driver or controller, or they may be mutually separate units. Alternatively, or additionally, the LED filament arrangement 1, 100, 101 may also comprise a controller 5, which may or may not be separate from one or both of the driver 402 and the controller 305.

[0186] As shown in Fig. 10, the driver 402 is arranged on a reflector or screen 403 of the pendant 400. The driver may also be arranged within or incorporated into the reflector or2025PF80072

[0187] 20

[0188] screen 403. The pendant 400 further comprises an electrical wiring 404 for connection to a source of electricity, such as a mains.

[0189] It is noted that the pendant 400 shown in Fig. 10 is only one example of a luminaire according to the invention. Any suitable type of luminaire may be envisaged, such as but not limited to, a standing luminaire, a wall hung luminaire, a chandelier, a reading luminaire, an outdoor luminaire, and a table luminaire.

[0190] 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.

[0191] 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

2025PF8007221CLAIMS:

1. A LED filament arrangement (1) configured to provide, in operation, LED filament arrangement light, the LED filament arrangement comprising:a first LED filament (2) configured to provide, in one or more operational modes, first white LED filament light having a first white luminous flux (LFW1) and red LED filament light having a red luminous flux (LFR), wherein the first LED filament comprises a plurality of first white LED light sources (21) configured to, in operation, provide first white LED light source light (210), a plurality of first colored LED light sources (22) configured to, in operation, provide red LED light source light (220), and a first elongated substrate (23), the plurality of first white LED light sources (21) and the plurality of first colored LED light sources (22) being arranged alternatingly on a major surface (230) of the first elongated substrate (23),a second LED filament (3) configured to provide, in one or more operational modes, second white LED filament light having a second white luminous flux (LFW2) and green LED filament light having a green luminous flux (LFG), wherein the second LED filament comprises a plurality of second white LED light sources (31) configured to, in operation, provide second white LED light source light (310), a plurality of second colored LED light sources (32) configured to, in operation, provide green LED light source light (320), and a second elongated substrate (33), the plurality of second white LED light sources (31) and the plurality of second colored LED light sources (32) being arranged alternatingly on a major surface (330) of the second elongated substrate (33),a third LED filament (4) configured to provide, in one or more operational modes, third white LED filament light having a third white luminous flux (LFW3) and blue LED filament light having a blue luminous flux (LFB), wherein the third LED filament comprises a plurality of third white LED light sources (41) configured to, in operation, provide third white LED light source light (410), a plurality of third colored LED light sources (42) configured to, in operation, provide blue LED light source light (420), and a third elongated substrate (43), the plurality of third white LED light sources (41) and the plurality of third colored LED light sources (42) being arranged alternatingly on a major surface (430) of the third elongated substrate (43), and2025PF8007222a controller (5) configured to control the ratios LFW1 / LFR, LFW2 / LFG and LFW3 / LFB, whereineach first white LED light source (21) comprises at least one first blue LED chip (211) and a first luminescent element (212), the first luminescent element comprising a first luminescent material (213), the at least one first blue LED chip is configured to provide, in operation, first blue LED chip light having a peak emission wavelength in a wavelength range from 420 nm to 490 nm, wherein the first luminescent material is configured to at least partly convert the first blue LED chip light into first converted light having a peak emission wavelength in a wavelength range from 500 nm to 670 nm, the first white LED filament light comprises the first converted light and optionally part of the first blue LED chip light, whereineach second white LED light source (31) comprises at least one second blue LED chip (311) and a second luminescent element (312), the second luminescent element comprising a second luminescent material (313), the at least one second blue LED chip is configured to provide, in operation, second blue LED chip light having a peak emission wavelength in a wavelength range from 420 nm to 490 nm, wherein the second luminescent material is configured to at least partly convert the second blue LED chip light into second converted light having a peak emission wavelength in a wavelength range from 500 nm to 670 nm, the second white LED filament light comprises the second converted light and optionally part of the second blue LED chip light, and whereineach third white LED light source (41) comprises at least one third blue LED chip (411) and a third luminescent element (412), the third luminescent element comprising a third luminescent material (413), the at least one first blue LED chip is configured to provide, in operation, first blue LED chip light having a peak emission wavelength in a wavelength range from 420 nm to 490 nm, wherein the third luminescent material is configured to at least partly convert the third blue LED chip light into third converted light having a peak emission wavelength in a wavelength range from 500 nm to 670 nm, the third white LED filament light comprises the third converted light and optionally part of the third blue LED chip light.

2. A LED filament arrangement according to claim 1, wherein a combination of the first luminescent elements (212) is in the form of first separated patterned luminescent dots, wherein a combination of the second luminescent elements (312) is in the form of second separated patterned luminescent dots, wherein a combination of the third luminescent elements (412) is in the form of third separated patterned luminescent dots, wherein each of2025PF8007223the first luminescent dots comprises first green-yellow phosphor particles and first red phosphor particles, wherein each of the second luminescent dots comprise second greenyellow phosphor particles and second red phosphor particles, and wherein each of the third luminescent dots comprise third green-yellow phosphor particles and third red phosphor particles.

3. A LED filament arrangement according to any one of the above claims, wherein the controller (5) further is configured to individually control the first LED filament (2) such that the ratio LFW1 / LFR can be individually varied, the second LED filament (3) such that the ratio LFW2 / LFG can be individually varied, and the third LED filament (4) such that the ratio LFW3 / LFB can be individually varied.

4. A LED filament arrangement according to any one of the above claims, and further comprising one or more of the following:a first encapsulant (24) configured to, at least partly, shield or protect the plurality of first white LED light sources (21) and the plurality of first colored LED light sources (22),a second encapsulant (34) configured to, at least partly, shield or protect the plurality of second white LED light sources (31) and the plurality of second colored LED light sources (32), anda third encapsulant (44) configured to, at least partly, shield or protect the plurality of third white LED light sources (41) and the plurality of third colored LED light sources (42).

5. A LED filament arrangement according to any one of the above claims, wherein the following applies:the plurality of first white LED light sources (21) and the plurality of first colored LED light sources (22) are arranged such that neighboring LED light sources are arranged with a first spacing (dl) being larger than at least a size (W22) of the first colored LED light sources,the plurality of second white LED light sources (31) and the plurality of second colored LED light sources (32) are arranged such that neighboring LED light sources are arranged with a second spacing (d2) being larger than at least a size (W32) of the second colored LED light sources, and2025PF8007224the plurality of third white LED light sources (41) and the plurality of third colored LED light sources (42) are arranged such that neighboring LED light sources are arranged with a third spacing (d3) being larger than at least a size (W42) of the third colored LED light sources.

6. A LED filament arrangement according to any one of the above claims, wherein one or more of the following applies:a size (W21) of the first blue LED chip (211) of the first white LED light sources (21) is larger than a size (W22) of a first colored LED chip of the first colored LED light sources (22) by at least 50 pm,a size (W31) of the second blue LED chip (311) of the second white LED light sources (31) is larger than a size (W32) of a second colored LED chip of the second colored LED light sources (32) by at least 50 pm, anda size (W41) of the third blue LED chip (411) of the third white LED light sources (41) is larger than a size (W42) of a third colored LED chip of the third colored LED light sources (42) by at least 50 pm.

7. A LED filament arrangement according to any one of the above claims, wherein one or more of the following applies:the first colored LED light sources (22) are direct-emitting colored LED light sources being free from luminescent material,the second colored LED light sources (32) are direct-emitting colored LED light sources being free from luminescent material, andthe third colored LED light sources (42) are direct-emitting colored LED light sources being free from luminescent material.

8. A LED filament arrangement according to any one of the above claims, wherein one or more of the following applies:the first luminescent material (213) is a luminescent material which is not excited by the red LED light source light,the second luminescent material (313) is a luminescent material which is not excited by the green LED light source light, andthe third luminescent material (413) is a luminescent material which is not excited by the blue LED light source light.2025PF80072259. A LED filament arrangement according to any one of the above claims, wherein the first LED filament (2) is arranged in a first envelope (25), wherein the second LED filament (3) is arranged in a second envelope (35), wherein the third LED filament (4) is arranged in a third envelope (45), and wherein the first envelope, the second envelope and the third envelope are mutually separate envelopes.

10. A LED filament arrangement according to any one of claims 1 to 8, wherein the first LED filament (2), the second LED filament (3), and the third LED filament (4) are arranged in a common envelope (7).

11. A LED filament arrangement according to any one of the above claims, wherein at least one of the following applies:(i) the plurality of first white LED light sources (21) and plurality of first colored LED light sources (22) arranged in an anti-parallel electrical configuration;(ii) the plurality of second white LED light sources (31) and plurality of second colored LED light sources (32) arranged in an anti-parallel electrical configuration; and(iii) the plurality of third white LED light sources (41) and plurality of third colored LED light sources (42) arranged in an anti-parallel electrical configuration.

12. A LED filament arrangement according to any one of the above claims, wherein the first colored LED light sources (22), the second colored LED light sources (32), the third colored LED light sources (42) and the controller is configured such that in a first operational mode, white light with a correlated color temperature, CCT, being identical to one or more of the correlated color temperature, CCT, of the first white LED light source light (210), the second white LED light source light (310), and / or the third white LED light source light (410) is provided.

13. A LED filament arrangement according to any one of the above claims, wherein the first colored LED light sources (22), the second colored LED light sources (32), the third colored LED light sources (42) and the controller is configured such that in a second operational mode, white light with a correlated color temperature, CCT, being different from one or more of the correlated color temperature, CCT, of the first white LED light source2025PF8007226light (210), the second white LED light source light (310) and the third white LED light source light (410) by at least 500 K is provided.

14. A LED filament arrangement according to any one of the above claims, wherein:the first LED filament (2) is electrically connected to a first electrical connection element (26), the second LED filament (3) is electrically connected to a second electrical connection element (36), the third LED filament (4) is electrically connected to a third electrical connection element (46), and the first electrical connection element, the second electrical connection element and the third electrical connection element are mutually separate electrical connection elements, orthe first LED filament (2), the second LED filament (3), and the third LED filament (4) are electrically connected to one common electrical connection element (8).

15. One or more LED filament lamps (300) or one or more luminaire (400) comprising a LED filament arrangement (1) according to any one of the above claims.

Images