A LED filament luminaire

Abstract

A LED filament luminaire (1) configured to provide, in operation, LED filament luminaire light (2), the LED filament luminaire (1) comprising a LED filament arrangement (3) and comprising one or more first LED filaments (4) configured to provide, in operation, first LED filament light (41) having a first peak emission wavelength, λ1, in a first wavelength range from 400 nm to 500 nm, one or more second LED filaments (5) configured to provide, in operation, second LED filament light (51) having a second peak emission wavelength, λ2, in a second wavelength range from 500 nm to 600 nm, wherein λ2 ≥ λ1 + 20 nm, and one or more third LED filaments (6) configured to provide, in operation, third LED filament light (61) having a third peak emission wavelength, λ3, in a third wavelength range from 600 nm to 700 nm, wherein λ3 ≥ λ2 + 20 nm, as well as at least two of one or more fourth LED filaments (7) configured to provide, in operation, fourth LED filament light (71) having a fourth peak emission wavelength, λ4, in a first wavelength range from 400 nm to 500 nm, wherein λ4 ≤ λ1 – 20 nm, one or more fifth LED filaments (8) configured to provide, in operation, fifth LED filament light (81) having a fifth peak emission wavelength, λ5, in a second wavelength range from 500 nm to 600 nm, wherein λ5 ≤ λ2 – 20 nm, and λ5 ≥ λ1 + 20 nm; and one or more sixth LED filaments (9) configured to provide, in operation, sixth LED filament light (91) having a sixth peak emission wavelength, λ6, in a third wavelength range from 600 nm to 700 nm, wherein λ6 ≥ λ3 + 20 nm, wherein in a first operational mode the LED filament luminaire light (2) is white light having a correlated color temperature in a range from 2000K to 6500K and a color rendering index of at least 80.

Description

[0001] 2025PF80055

[0002] 1

[0003] A LED FILAMENT LUMINAIRE

[0004] FIELD OF THE INVENTION

[0005] The invention relates to a LED filament luminaire configured to, in operation, provide, in operation, LED filament luminaire light, the LED filament luminaire comprising a LED filament arrangement. The invention further relates to a control arrangement for controlling the LED filament luminaire.

[0006] As used herein, the term “violet light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 400 nm to 420 nm.

[0007] As used herein, the term “royal blue light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 440 nm to 460 nm.

[0008] As used herein, the term “cyan light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 480 nm to 500 nm.

[0009] As used herein, the term “blue light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 420 nm to 500 nm.

[0010] 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 550 nm.

[0011] As used herein, the term “yellow light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 550 nm to 580 nm.

[0012] As used herein, the term “amber light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 580 nm to 600 nm.

[0013] As used herein, the term “short- wavelength red light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 600 nm to 650 nm.

[0014] As used herein, the term “red light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 600 to 700 nm.

[0015] As used herein, the term “long-wavelength red light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 650 to 700 nm.

[0016] 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 2000 K to 6500 K or 2700 K to 4500 K.2025PF80055

[0017] 2

[0018] 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.

[0019] 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.

[0020] BACKGROUND OF THE INVENTION

[0021] 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.

[0022] WO 2025 / 008209 Al discloses a LED filament lamp configured to, in operation, provide lamp light emitting from a plurality of LED filaments. The LED filament lamp comprises a phosphor-converted green LED filament and a hybrid direct-emitting red-blue LED filament. The LED filament lamp comprises at least one first LED filament and at least one second LED filament. The first LED filament comprises a plurality of first blue LEDs configured to, in operation, emit first LED light being blue light. When the light emits from the blue or UV LEDs, the light is passing through the mixture of the greenish phosphor coating, wherein the converted light is mainly distributed in a part of the visible light spectrum as a green light. The first LED light is converted into a first converted light being only green light. The light emitted from the second LED filament may be blue light or red light, or a light mixed with blue light or red light. The red-blue light emitted from the red-blue LED filament stimulates the relative blue and red receptors of the eye, and the converted green light stimulates the green receptors of the eye, such that the resulting mix of converted green light, the blue and red light gives the appearance of a white light. The white light may be controllable. The LED filaments may be controllable, such that the LED filaments together emits white light with a variable color temperature or emits colored light.

[0023] LED filaments are now also considered to be used in luminaires. It is desired to improve the optical performance of LED filament luminaires.

[0024] SUMMARY OF THE INVENTION

[0025] It is an object of the present invention to overcome this problem, and to provide a LED filament luminaire with an improved optical performance.

[0026] It is a further object of the present invention to provide a LED filament luminaire with at least one of an improved flexibility in providing colored light, improved or increased optical performance features, and improved or increased design features.2025PF80055

[0027] 3

[0028] According to a first aspect of the invention, this and other objects are achieved by means of a LED filament luminaire configured to provide, in operation, LED filament luminaire light, the LED filament luminaire comprising a LED filament arrangement configured to provide, in operation, LED filament arrangement light, the LED filament arrangement comprising one or more first LED filaments configured to provide, in operation, first LED filament light having a first peak emission wavelength, I, in a first wavelength range from 400 nm to 500 nm, one or more second LED filaments configured to provide, in operation, second LED filament light having a second peak emission wavelength, X2, in a second wavelength range from 500 nm to 600 nm, wherein X2 > XI + 20 nm, one or more third LED filaments configured to provide, in operation, third LED filament light having a third peak emission wavelength, X3, in a third wavelength range from 600 nm to 700 nm, wherein X3 > X2 + 20 nm, and wherein the LED filament arrangement further comprises at least two of one or more fourth LED filaments configured to provide, in operation, fourth LED filament light having a fourth peak emission wavelength, X4, in a first wavelength range from 400 nm to 500 nm, wherein X4 < XI - 20 nm, one or more fifth LED filaments configured to provide, in operation, fifth LED filament light having a fifth peak emission wavelength, X5, in a second wavelength range from 500 nm to 600 nm, wherein X5 < X2 - 20 nm, and X5 > XI + 20 nm, and one or more sixth LED filaments configured to provide, in operation, sixth LED filament light having a sixth peak emission wavelength, X6, in a third wavelength range from 600 nm to 700 nm, wherein X6 > X3 + 20 nm, wherein in a first operational mode the LED filament luminaire light is white light having a correlated color temperature in a range from 2000 K to 6500 K and a color rendering index of at least 80.

[0029] Each LED filament comprised by the LED filament arrangement may comprise a first end and a second end opposite the first end. At least one of the first end and the second end may comprise a LED filament connector configured for electrical and / or mechanical connection of the LED filament.

[0030] The one or more first LED filaments, the one or more second LED filaments, the one or more third LED filaments, and if present, the one or more fourth LED filaments, the one or more fifth LED filaments, and the one or more sixth LED filaments may be arranged in a mesh configuration. The term “mesh configuration" as used herein needs to be interpreted as that the LED filaments comprised by the LED filament arrangement form an interconnected grid or mesh structure in which each edge of the mesh is formed by a respective LED filament of the LED filament arrangement. The nodes or vertices of the mesh may be formed by connectors (e.g. connections of the LED filament connectors). The2025PF80055

[0031] 4

[0032] connectors being configured to mechanically and / or electrically connect the LED filaments to each other and / or to a power supply. Such a mesh configuration may be a two-dimensional or three-dimensional configuration of LED filaments in which the LED filaments are arranged spaced apart from each other, being in (physical) contact with neighboring LED filaments only via their respective LED filament connectors at the mesh nodes.

[0033] Thereby, and especially by providing a high number of LED filaments, a LED filament luminaire with an improved optical performance is provided for. Furthermore, a LED filament luminaire with at least one of an improved flexibility in providing colored and white light, improved or increased optical performance features, and improved or increased design features is provided for.

[0034] In the first operational mode, the LED filament luminaire light is white light which may have a correlated color temperature being at least 2400 K and / or at most 4500 K, such as in a range from 2400 K to 6500 K, or 2000 K to 4500 K, or 2400 K to 4500 K.

[0035] In the first operational mode, the LED filament luminaire light is white light which may have a color rendering index of at least 85, or at least 90.

[0036] The LED filament arrangement may further comprise a controller configured to (individually) control the one or more first LED filament, the one or more second LED filament, the one or more third LED filament, and when provided, the one or more fourth LED filament, the one or more fifth LED filament and the one or more sixth LED filament.

[0037] Thereby a LED filament luminaire is provided with which it is possible to control the different colors individually. This in turn enables improved control of the corelated color temperature, CCT, and / or the color of the LED filament luminaire light.

[0038] The LED filament arrangement may further comprise a user control element connectable to the controller, the user control element being configured to generate a user selected value from a range of user selectable values. The controller may be configured to control the LED filament to provide, based on a first user selectable value in a first operational mode, first filament luminaire light being first white light having a first correlated color temperature, CCT1, and to provide based on a second user selectable value in a second operational mode second filament luminaire light being second white light having a second correlated color temperature, CCT2, wherein |CCT2-CCT1| < 1000 K, such as |CCT2-CCT1| < 500 K, especially |CCT2-CCT1| < 300 K.

[0039] Thereby a LED filament arrangement is provided wherein, by switching between the first and second user selectable value, in the far field substantially (the same or similar) white light is provided, whereas when viewing the LED filament luminaire a2025PF80055

[0040] 5

[0041] decorative effect is provided by switching between different LED filaments (e.g. between white and RGB filaments).

[0042] The LED filament arrangement may comprise the one or more fourth LED filaments, the one or more fifth LED filaments, and the one or more sixth LED filaments. Thereby, a LED filament luminaire with a further improved optical performance is provided for.

[0043] The LED filament arrangement may comprise at least three first LED filaments, at least three second LED filaments, at least three third LED filaments, and when provided, at least three fourth LED filaments, and when provided, at least three fifth LED filaments, and when provided, at least three sixth LED filaments.

[0044] Thereby, a LED filament luminaire with a further improved optical performance is provided for.

[0045] The LED filament arrangement may further comprise one or more seventh LED filaments configured to, in operation, provide seventh LED filament light being white light having a correlated color temperature in a range from 1700 K to 6500 K or in a range from 1700 K to 2500 K.

[0046] Thereby, a LED filament luminaire with a further improved optical performance is provided for, especially in an operational mode, such as the first operational mode, where the LED filament luminaire light provided is white light.

[0047] The LED filament arrangement may comprise at least two or three seventh LED filaments having a correlated color temperature mutually different by at least 500 K.

[0048] Thereby, a LED filament luminaire with an even further improved optical performance is provided for, especially in an operational mode, such as the first operational mode, where the LED filament luminaire light provided is white light.

[0049] Neighboring LED filaments of the one or more first LED filaments, the one or more second LED filaments, the one or more third LED filaments, and where provided the one or more fourth LED filaments, and where provided the one or more fifth LED filaments, and where provided the one or more sixth LED filaments, and, where provided, the one or more seventh LED filaments, are electrically isolated from one another or connected to one another by isolated connectors.

[0050] Thereby an improved control with the controller of the different colors individually for CCT and / or color control is enabled.

[0051] LED filaments of the one or more first LED filaments, the one or more second LED filaments, the one or more third LED filaments, and, where provided, the one or more2025PF80055

[0052] 6

[0053] fourth LED filaments, the one or more fifth LED filaments, and the one or more sixth LED filaments, and, where provided, the one or more seventh LED filaments configured to, in operation, provide LED filament light of the same color may be arranged closer to each other than LED filaments of the one or more first LED filaments, the one or more second LED filaments, the one or more third LED filaments, where provided, the one or more fourth LED filaments, the one or more fifth LED filaments, and the one or more sixth LED filaments, and, where provided, the one or more seventh LED filaments configured to, in operation, provide LED filament light of mutually different colors.

[0054] Such an arrangement of the LED filaments enables a structurally and functionally simpler to achieve individual control of the different colors.

[0055] LED filaments of one or more of the one or more first LED filaments and the one or more fourth LED filaments may be electrically connected (in series or in parallel) via a first channel.

[0056] LED filaments of one or more of the one or more second LED filaments and the one or more fifth LED filaments may be electrically connected (in series or in parallel) via a second channel.

[0057] LED filaments of one or more of the one or more third LED filaments and the one or more sixth LED filaments may be electrically connected (in series or in parallel) via a third channel.

[0058] Thereby, a LED filament luminaire with a simple electrical circuitry enabling individual control of the respective sets of one or more LED filaments is provided for.

[0059] LED filaments of one or more of the one or more first LED filaments and LED filaments of the one or more fourth LED filaments may be mechanically connected in a first row.

[0060] LED filaments of one or more of the one or more second LED filaments and LED filaments of the one or more fifth LED filaments may be mechanically connected in a second row.

[0061] LED filaments of one or more of the one or more third LED filaments and LED filaments of the one or more sixth LED filaments may be mechanically connected in a third row.

[0062] Thereby, a LED filament luminaire with a simple mechanical structure and connection is provided for. It is noted that as used herein the term ‘row’ is intended to mean any (elongated) sequence or any end-to-end configuration, or any configuration one after the other, in which LED filaments may be arranged.2025PF80055

[0063] 7

[0064] The first row may be arranged in straight configuration, the second row may be arranged in straight configuration, and / or the third row may be arranged in straight configuration.

[0065] The first row may be arranged in a spiral configuration, the second row may be arranged in a spiral configuration, and / or the third row may be arranged in a spiral configuration.

[0066] The first row may be arranged in a meandering configuration, the second row may be arranged in a meandering configuration, and / or the third row may be arranged in a meandering configuration.

[0067] The first row may be arranged in a circular configuration, the second row may be arranged in a circular configuration, and / or the third row may be arranged in a circular configuration.

[0068] Thereby, easier control of the emitted LED luminaire light is achieved, which in turn provides a LED filament luminaire with an improved performance. Especially, arranging the rows in a spiraling configuration or a meandering configuration provides for particularly simple control of the emitted LED luminaire light.

[0069] The LED filament arrangement may have a dome shape or a cone shape or a tapering shape.

[0070] Thereby an LED filament arrangement providing LED filament arrangement light with an improved quality, homogeneity and / or directionality, and further being particularly suitable for use in luminaires, is provided for.

[0071] The LED filament luminaire may further comprise a tapered top luminaire part and a tapered bottom luminaire part, wherein the LED filament arrangement is arranged in between the tapered top luminaire part and the tapered bottom luminaire part.

[0072] For example, the tapered top luminaire part may be (semi)-reflective, while the tapered bottom luminaire part may be light diffusing.

[0073] Such a setup provides improved homogeneity of said luminaire light.

[0074] At least one of the tapered top luminaire part and the tapered bottom luminaire part may comprise optics selected from the group of light-diffusing optics, light-reflecting optics, light-refracting optics, light diffracting optics and light-converting optics.

[0075] Thereby the quality and the flexibility of the provided LED filament luminaire light is improved even further.2025PF80055

[0076] 8

[0077] The LED filament luminaire may further comprise a light exit window, the light exit window comprising a light redirector configured to redirect the LED filament arrangement light into LED filament luminaire light.

[0078] Thereby further improved directionality of the LED filament luminaire light is achieved.

[0079] One or more of the first LED filaments and the fourth LED filaments may comprise at least two of K LED filaments configured to, in operation, provide violet LED filament light, K LED filaments configured to, in operation, provide royal blue LED filament light, and K LED filaments configured to, in operation, provide cyan LED filament light. One or more of the second LED filaments and the fifth LED filaments may comprise at least two of M LED filaments configured to, in operation, provide green LED filament light, M LED filaments configured to, in operation, provide LED yellow filament light, and M LED filaments configured to, in operation, provide amber LED filament light.

[0080] One or more of the third LED filaments and the sixth LED filaments may comprise at least two of N LED filaments configured to, in operation, provide shortwavelength red LED filament light, N LED filaments configured to, in operation, provide medium-wavelength red LED filament light, and N LED filaments configured to, in operation, provide long-wavelength red LED filament light.

[0081] K, M and N may be chosen such that K > 4, M > 4, and N > 4.

[0082] Thereby a LED filament luminaire with a further improved optical performance is provided for.

[0083] The seventh LED filaments may comprise P LED filaments configured to, in operation, provide white LED filament light. The white LED filament light may, or may not, have the same CCT.

[0084] P may be chosen such that P > 4.

[0085] Thereby a LED filament luminaire with an even further improved optical performance is provided for.

[0086] In a second operational mode the LED filament luminaire light may be red light, in a third operational mode the LED filament luminaire light may be green light, and in a fourth operational mode the LED filament luminaire light may be blue light.

[0087] The LED filament luminaire or the LED filament arrangement of the LED filament luminaire may comprise a total of at least 10, at least 15, at least 20, or at least 30 LED filaments.2025PF80055

[0088] 9

[0089] In a second aspect, the invention provides a control arrangement for controlling the LED filament luminaire as described herein. The control arrangement comprising a controller configured to individually control the one or more first LED filament, the one or more second LED filament, the one or more third LED filament, and when provided, the one or more fourth LED filament, the one or more fifth LED filament, the one or more sixth LED filament, and the one or more sixth LED filament. The control arrangement further comprises a user control element connectable to the controller, the user control element being configured to generate a user selected value from a range of user selectable values. The controller is configured to control the LED filament luminaire to provide, based on a first user selectable value in a first operational mode, first filament luminaire light being first white light having a first correlated color temperature, CCT1, and to provide based on a second user selectable value in a second operational mode second filament luminaire light being second white light having a second correlated color temperature, CCT2, wherein |CCT2-CCT1| < 1000 K, such as |CCT2-CCT1| < 500 K, especially |CCT2-CCT1| < 300 K. The first color points of the LED filaments providing the first white light are closer to the BBL compared to second color points of the LED filaments providing the second white light.

[0090] Thereby a control arrangement is provided wherein a user can switch between a first and second user selectable value, thereby controlling the luminaire to provide white light remaining substantially (the same or similar) white light in the far field white providing a decorative effect when viewing the LED filament luminaire by switching between different LED filaments (e.g. between white and RGB filaments).

[0091] The control element may be especially suitable to control a LED filament luminaire comprising at least three seventh LED filaments having a correlated color temperature mutually different by at least 500 K. Hence, the at least three seventh LED filament may provide primary seventh LED filament light, secondary seventh LED filament light and tertiary seventh LED filament light having respectively different color point. The primary seventh may have a first color point (xl,yl), the secondary seventh LED filament may have a second color point (x2,y2), and the tertiary seventh LED filament may have a third color point (x3,y3). The following may apply: (i) |x2-xl| >0.05 (or >0.1, or >0.2) and / or |y2-y 11>0.05 (or >0.1, or >0.2); (ii) |x3-x2|>0.05 (or >0.1, or >0.2) and / or |y3-y2|>0.05 (or >0.1, or >0.2); and (iii) |x3-xl|>0.05 (or >0.1, or >0.2) and / or |y3-y 11>0.05 (or >0.1, or >0.2).

[0092] The user control element may for example be a single dial, a single slider, a single lever, a single button, and a single double button.2025PF80055

[0093] 10

[0094] It is noted that the invention relates to all possible combinations of features recited in the claims.

[0095] BRIEF DESCRIPTION OF THE DRAWINGS

[0096] 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.

[0097] Fig. 1 shows a schematical top view of a LED filament luminaire according to the invention with a LED filament arrangement comprising a network of LED filaments.

[0098] Fig. 2 shows a schematical top view of a LED filament arrangement of a LED filament luminaire according to the invention.

[0099] Fig. 3 shows a schematical side view of the LED filament arrangement according to Fig. 2.

[0100] Fig. 4 shows a schematical top view of another LED filament arrangement of a LED filament luminaire according to the invention.

[0101] Fig. 5 shows a schematical side view of the LED filament arrangement according to Fig. 4.

[0102] Fig. 6 shows a schematical top view of another LED filament arrangement of a LED filament luminaire according to the invention.

[0103] Fig. 7 shows a schematical side view of the LED filament arrangement according to Fig. 6.

[0104] Fig. 8 shows a schematical top view of another LED filament arrangement of a LED filament luminaire according to the invention.

[0105] Fig. 9 shows a schematical side view of the LED filament arrangement according to Fig. 8.

[0106] Fig. 10 shows an enlarged view of the detail marked X in Fig. 9.

[0107] Fig. 11 shows a schematical top view of another LED filament arrangement of a LED filament luminaire according to the invention.

[0108] Fig. 12 shows a schematical side view of the LED filament arrangement according to Fig. 11.

[0109] 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.2025PF80055

[0110] 11

[0111] DETAILED DESCRIPTION

[0112] 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.

[0113] Fig. 1 shows a side view of an exemplary LED filament luminaire 1 according to the invention. The LED filament luminaire 1 is shown in the form of a pendant. The LED filament luminaire 1 is configured to, in operation, provide LED filament light 2. The LED filament luminaire 1 comprises a LED filament arrangement 3, 30, 31, 32, 33 according to any embodiment of the invention and as described in detail further below. The LED filament arrangement 3, 30, 31, 32, 33 is as shown in Fig. 1 provided hanging freely from a base 200. The base 200 may comprise a threading 201 for connection to a socket, and a terminal 202 for connection to a source of electrical energy.

[0114] The LED filament luminaire 1 further comprises a socket 100 for connecting the LED filament arrangement 3, 30, 31, 32, 33 to the LED filament luminaire 1. The socket 100 is adapted to cooperate with the base 200 of the LED filament arrangement 3, 30, 31, 32, 33. The socket 100 may comprise a threading adapted to cooperate with the threading 201 of the LED filament arrangement 3, 30, 31, 32, 33. The socket 100 may comprise a terminal adapted to cooperate with the terminal 202 of the LED filament arrangement 3, 30, 31, 32, 33. The LED filament arrangement 1 further comprises a reflector or screen 101.

[0115] The LED filament luminaire 1 may further comprise a driver 102 configured for controlling the LED filament arrangement 3, 30, 31, 32, 33. The driver 102 may or may not be the same unit as the controller 10 of the LED filament arrangement 3, 30, 31, 32, 33. In other words, the driver 102 and the controller 10 may be integrated into one and the same driver or controller, or they may be mutually separate units.

[0116] As shown in Fig. 1, the driver 102 is arranged on a reflector or screen 101 of the LED filament luminaire 1. The driver 102 may also be arranged within or incorporated into the reflector or screen 101. The LED filament luminaire 1 further comprises an electrical wiring 103 for connection to a source of electricity, such as a mains.

[0117] The LED filament luminaire 1 further comprises a light exit window 104. The LED filament luminaire light 2 is emitted from the light exit window 104. The light exit window 104 comprises an optional light redirector 105. The light redirector 105 is configured2025PF80055

[0118] 12

[0119] to redirect the LED filament arrangement light 41, 51, 61, 71, 81, 91, 111 (cf. Fig. 3) into LED filament luminaire light 2. The LED filament luminaire 1 may further optionally comprise optics selected from the group of light-diffusing optics, light-reflecting optics, light-refracting optics, light diffracting optics and light-converting optics.

[0120] In a first operational mode the LED filament luminaire light 2 is white light having a correlated color temperature in a range from 2000 K to 6500 K and a color rendering index of at least 80. In a second operational mode the LED filament luminaire light 2 is red light. In a third operational mode the LED filament luminaire light 2 is green light. In a fourth operational mode the LED filament luminaire light 2 is blue light.

[0121] It is noted that the LED filament luminaire 1 in the form of a pendant shown in Fig. 1 is only one example of a LED filament luminaire 1 according to the invention. Any suitable type of LED filament 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.

[0122] The LED filament arrangement 3, 30, 31, 32, 33 may also be provided within a lamp, for instance in the form of a light bulb. Such a lamp may further comprise a driver or controller configured for controlling the plurality of LED filaments 4-9 and 11 of the LED filament arrangement 3, 30, 31, 32, 33. The controller is configured to power the plurality of LED filaments 4-9 and 11 via electrical circuitry (not visible on the figures) of the LED filament arrangement 3, 30, 31, 32, 33. The LED filament arrangement 3, 30, 31, 32, 33 may also comprise a controller 10, which may or may not be separate from the controller of the lamp. In other words, the controller of the lamp and the controller 10 of the LED filament arrangement 3, 30, 31, 32, 33 may be integrated into one and the same driver or controller, or they may be mutually separate units. The controller of the lamp, where such a controller is provided, may or may not be separate from one or both of the driver 102 and the controller 10. The lamp may further comprise an envelope at least partially enveloping the LED filament arrangement 3, 30, 31, 32, 33. The lamp may further comprise a cap. The controller of the lamp may be arranged within the envelope. When comprising a cap, the controller of the lamp may also be arranged inside the cap such that it is hidden from view. The lamp may further comprise threading 201 for connection to a socket, and a terminal 202 for connection to a source of electrical energy. The envelope of the lamp may further and optionally be provided with a coating (not shown), such as a reflective coating, covering at least a part of the envelope. The envelope may be a transparent envelope. The envelope may be shaped in any feasible shape, for example such as to resemble the shape of any one of a standard light2025PF80055

[0123] 13

[0124] 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.

[0125] In the following, various embodiments of a LED filament arrangement 3, 30, 31, 32, 33 of a LED filament luminaire 1 according to the invention will be described.

[0126] Fig. 2 shows a schematical top view of a LED filament arrangement 3 of a LED filament luminaire 1 according to the invention. Fig. 3 shows a schematical side view of the LED filament arrangement 3.

[0127] Generally, and irrespective of the embodiment the LED filament arrangement 3 comprises one or more first LED filaments 4, one or more second LED filaments 5 and one or more third LED filaments 6, as well as two or more of one or more fourth LED filaments 7, one or more fifth LED filaments 8 and one or more sixth LED filaments 9. The LED filament arrangement 3 is configured to, in operation, provide LED filament arrangement light 20 (cf. Fig. 3). The LED filaments comprised by the LED filament arrangement 3 may be arranged in a mesh configuration.

[0128] The one or more first LED filaments 4 are configured to, in operation, provide first LED filament light 41. The first LED filament light 41 comprises a first peak emission wavelength, I, in a first wavelength range from 400 nm to 500 nm. The one or more first LED filaments 4 may comprise at least two of K LED filaments configured to, in operation, provide violet LED filament light, K LED filaments configured to, in operation, provide royal blue LED filament light, and K LED filaments configured to, in operation, provide cyan LED filament light. K may be larger than or equal to 3, larger than or equal to 4, larger than or equal to 5, or larger than or equal to 6.

[0129] The one or more second LED filaments 5 are configured to, in operation, provide second LED filament light 51. The second LED filament light 51 comprises a second peak emission wavelength, X2, in a second wavelength range from 500 nm to 600 nm. The first peak emission wavelength XI and the second peak emission wavelength X2 are chosen such that X2 > XI + 20 nm. The one or more second LED filaments 5 may comprise at least two of M LED filaments configured to, in operation, provide green LED filament light, M LED filaments configured to, in operation, provide LED yellow filament light, and M LED filaments configured to, in operation, provide amber LED filament light. M may be larger than or equal to 3, larger than or equal to 4, larger than or equal to 5, or larger than or equal to 6.2025PF80055

[0130] 14

[0131] The one or more third LED filaments 6 are configured to, in operation, provide third LED filament light 61. The third LED filament light 61 comprises a third peak emission wavelength, 3, in a third wavelength range from 600 nm to 700 nm. The third peak emission wavelength A3 and the second peak emission wavelength A2 are chosen such that A3 > X2 + 20 nm. The one or more third LED filaments 6 may comprise at least two of N LED filaments configured to, in operation, provide short- wavelength red LED filament light, N LED filaments configured to, in operation, provide medium-wavelength red LED filament light, and N LED filaments configured to, in operation, provide long-wavelength red LED filament light. N may be larger than or equal to 3, larger than or equal to 4, larger than or equal to 5, or larger than or equal to 6. Preferably, K, M and N are equal to one another.

[0132] The one or more fourth LED filaments 7 are configured to, in operation, provide fourth LED filament light 71. The fourth LED filament light 71 comprises a fourth peak emission wavelength, X4, in a first wavelength range from 400 nm to 500 nm. The fourth peak emission wavelength A4 and the first peak emission wavelength Al are chosen such that Z4 < kl - 20 nm. The one or more fourth LED filaments 7 may comprise at least two of K LED filaments configured to, in operation, provide violet LED filament light, K LED filaments configured to, in operation, provide royal blue LED filament light, and K LED filaments configured to, in operation, provide cyan LED filament light. K may be larger than or equal to 3, larger than or equal to 4, larger than or equal to 5, or larger than or equal to 6.

[0133] The one or more fifth LED filaments 8 are configured to, in operation, provide fifth LED filament light 81. The fifth LED filament light 81 comprises a fifth peak emission wavelength, 5, in a second wavelength range from 500 nm to 600 nm. The fifth peak emission wavelength A5 and the second peak emission wavelength A2 are chosen such that A5 < Z2 - 20 nm. The fifth peak emission wavelength A5 and the first peak emission wavelength XI are chosen such that Z5 > kl + 20 nm. The one or more fifth LED filaments 8 may comprise at least two of M LED filaments configured to, in operation, provide green LED filament light, M LED filaments configured to, in operation, provide LED yellow filament light, and M LED filaments configured to, in operation, provide amber LED filament light. M may be larger than or equal to 3, larger than or equal to 4, larger than or equal to 5, or larger than or equal to 6.

[0134] The one or more sixth LED filaments 9 are configured to, in operation, provide sixth LED filament light 91. The sixth LED filament light 91 comprises a sixth peak emission wavelength, A6, in a third wavelength range from 600 nm to 700 nm, The third peak2025PF80055

[0135] 15

[0136] emission wavelength X3 and the sixth peak emission wavelength Z6 are chosen such that A6 > A3 + 20 nm. The one or more sixth LED filaments 9 may comprise at least two of N LED filaments configured to, in operation, provide short- wavelength red LED filament light, N LED filaments configured to, in operation, provide medium-wavelength red LED filament light, and N LED filaments configured to, in operation, provide long-wavelength red LED filament light. N may be larger than or equal to 3, larger than or equal to 4, larger than or equal to 5, or larger than or equal to 6.

[0137] The LED filament arrangement 3 shown in Figs. 2 and 3 comprises one or more fourth LED filaments 7, one or more fifth LED filaments 8 and one or more sixth LED filaments 9. However, it is also feasible to omit one of the one or more fourth LED filaments 7, one or more fifth LED filaments 8 and one or more sixth LED filaments 9.

[0138] The LED filament arrangement 3 further comprises one or more optional seventh LED filaments 11 configured to, in operation, provide seventh LED filament light 111. The seventh LED filament light 111 comprises white light having a correlated color temperature in a range from 1700 K to 6500 K. The one or more seventh LED filaments 11 may comprise P LED filaments configured to, in operation, provide white LED filament light. P may be larger than or equal to 3, larger than or equal to 4, larger than or equal to 5, or larger than or equal to 6. Preferably, P, K, M and N are equal to one another. The one or more seventh LED filaments 11 may be configured to, in operation, provide white LED filament light 111 having mutually different correlated color temperature, CCT, differing by at least 500 K. Alternatively, the one or more seventh LED filaments 11 may be configured to, in operation, provide white LED filament light 111 having the same correlated color temperature, CCT.

[0139] Generally, and irrespective of the embodiment, the LED filament arrangement 3 is configured to emit, in operation, LED filament arrangement light 20 (cf. Fig. 3). The LED filament arrangement light 20 forms at least a part of the LED filament luminaire light 2. The LED filament luminaire light 2 comprises the LED filament arrangement light 20. The LED filament arrangement light 20, and thus the LED filament luminaire light 2, comprises a combination of the first LED filament light 41, the second LED filament light 51, the third LED filament light 61, the fourth LED filament light 71, the fifth LED filament light 81, the sixth LED filament light 91, and, where one or more seventh LED filaments 11 are provided, the seventh LED filament light 111.

[0140] The LED filament arrangement further comprises an optional controller 10. The controller 10 is configured to (individually) control the one or more first LED filaments2025PF80055

[0141] 16

[0142] 4, the one or more second LED filaments 5, the one or more third LED filaments 6, and, where provided, the one or more fourth LED filaments 7, the one or more fifth LED filaments 8 and the one or more sixth LED filaments 9, and, where provided, the one or more seventh LED filaments 11. Thus, the controller 10 is configured to (individually) control the first LED filament light 41, the second LED filament light 51, the third LED filament light 61, and where provided, the fourth LED filament light 71, the fifth LED filament light 81 and the sixth LED filament light 91, and, where provided, the seventh LED filament light 111.

[0143] The LED filament arrangement 3 may additionally comprise a user control element 15 (cf. Fig. 4, 6, and 11) connectable to the controller 10. The user control element 15 being configured to generate a user selected value from a range of user selectable values. Based on a first user selectable value in a first operational mode, the controller may be configured to control the LED filament arrangement to provide first filament luminaire light being first white light having a first correlated color temperature, CCT1, and to provide based on a second user selectable value in a second operational mode second filament luminaire light being second white light having a second correlated color temperature, CCT2, wherein |CCT2-CCT1| < 300 K. First color points of the LED filaments providing the first white light may be closer to the BBL compared to second color points of the LED filaments providing the second white light. The user control element 15 may for example be a single dial, a single slider, a single lever, a single button, and a single double button.

[0144] The controller 10 may further comprise an input interface and an output interface. The controller may be configured to receive, via the input interface, from the user control element the user selectable value. The controller may further be configured to determine, based on the user selectable value, control instructions for the (individual LED filaments of the) LED filament arrangement. The controller 10 may output, via the output interface, the determined control instructions to the LED filament arrangement 3

[0145] LED filaments 4, 5, 6, 7, 8, 9, 11 of the LED filament arrangement 3 configured to, in operation, provide LED filament light 41, 51, 61, 71, 81, 91, 111 of the same color are electrically connected in the same circuit, or are electrically connected (in series, or are electrically connected in parallel) via a first channel. For instance, LED filaments of one or both of the one or more first LED filaments 4 and the one or more fourth LED filaments 7 are electrically connected (in series or in parallel) via a first channel. For instance, LED filaments of one or both of the one or more second LED filaments 5 and the one or more fifth LED filaments 8 are electrically connected (in series or in parallel) via a second channel. For instance, LED filaments of one or both of the one or more third LED2025PF80055

[0146] 17

[0147] filaments 6 and the one or more sixth LED filaments 9 are electrically connected in series or in parallel via a third channel.

[0148] LED filaments 4, 5, 6, 7, 8, 9, 11 of the LED filament arrangement 3 configured to, in operation, provide LED filament light 41, 51, 61, 71, 81, 91, 111 of the same color are further arranged closer to each other than LED filaments 4, 5, 6, 7, 8, 9, 11 of the LED filament arrangement 3 configured to, in operation, provide LED filament light 41, 51, 61, 71, 81, 91, 111 of mutually different colors.

[0149] Alternatively, or additionally, LED filaments 4, 5, 6, 7, 8, 9, 11 of the LED filament arrangement 3 configured to, in operation, provide LED filament light 41, 51, 61, 71, 81, 91, 111 of the same color are arranged in a row (cf. Fig. 2) or on the same height level (cf. Fig. 3) in the LED filament luminaire.

[0150] The LED filament arrangement light 20, or the LED luminaire light 2, comprises a combination of the LED filament light 41, 51, 61, 71, 81, 91 and 111. In a first operational mode, the LED filament arrangement light 20, or the LED luminaire light 2, is red light. In a second operational mode, the LED filament arrangement light 20, or LED luminaire light 2, is green light. In a third operational mode the LED filament arrangement light 20, or LED luminaire light 2, is blue light. In a fourth operational mode the LED filament arrangement light 20, or LED luminaire light 2, is white lighting having a correlated color temperature in a range from 2000 K to 6500 K and a color rendering index of at least 80. The controller 10 may further be configured to switch the LED filament arrangement 3, or the LED filament luminaire 1, between the said first, second, third and fourth operational modes.

[0151] Fig. 4 shows a schematical top view of another LED filament arrangement 30 of a LED filament luminaire 1 according to the invention. Fig. 5 shows a schematical side view of the LED filament arrangement 30. The LED filament arrangement 30 differs from the LED filament arrangement 3 described above and shown in Figs. 2 and 3 in virtue of the following features.

[0152] Neighboring LED filaments 4, 5, 6, 7, 8, 9, 11 of the one or more first LED filaments 4, the one or more second LED filaments 5, the one or more third LED filaments 6, the one or more fourth LED filaments 7, the one or more fifth LED filaments 8, the one or more sixth LED filaments 9, and the one or more seventh LED filaments 11, are electrically isolated from one another. This may be obtained by ensuring that neighboring LED filaments are electrically isolated from one another, for instance by connecting such neighboring LED filaments to one another by isolated connectors 12.2025PF80055

[0153] 18

[0154] The LED filaments 4, 5, 6, 7, 8, 9, 11 of a LED filament arrangement 3, 30, 31, 32, 33 according to the invention may be arranged in various shapes or fashions. As a first example, the LED filament arrangements 3 and 30 described above each comprise about fifty LED filaments 4, 5, 6, 7, 8, 9, 11 arranged to form a fairly complex overall star-shaped mesh structure.

[0155] Fig. 6 shows a schematical top view of another LED filament arrangement 31 of a LED filament luminaire 1 according to the invention. Fig. 7 shows a schematical side view of the LED filament arrangement 31.

[0156] The LED filament arrangement 31 differs from the LED filament arrangements 3 and 30 described above and shown in Figs. 2 to 5 in that it comprises about twenty-five LED filaments 4, 5, 6, 7, 8, 9, 11 arranged to form a simpler overall star-shaped mesh structure as compared to that of the LED filament arrangements 3 and 30.

[0157] Also, LED filaments of one or both of the one or more first LED filaments 4 and the LED filaments of the one or more fourth LED filaments 7 are mechanically connected in a first row R1 of the mesh. LED filaments of one or both of the one or more second LED filaments 5 and the LED filaments of the one or more fifth LED filaments 8 are mechanically connected in a second row R2 of the mesh. LED filaments of one or both of the one or more third LED filaments 6 and LED filaments of the one or more sixth LED filaments 9 are mechanically connected in a third row R3 of the mesh.

[0158] As shown in Fig. 6, the first row R1 is arranged in straight configuration, the second row R2 is arranged in straight configuration, and the third row R3 is arranged in straight configuration.

[0159] Fig. 8 shows a schematical top view of another LED filament arrangement 32 of a LED filament luminaire 1 according to the invention. Fig. 9 shows a schematical side view of the LED filament arrangement 32. Fig. 10 shows a cut-out view of a detail of the LED filament arrangement 32 corresponding to the detail marked X in Fig. 9.

[0160] The LED filament arrangement 32 differs from the LED filament arrangements 3, 30 and 31 described above and shown in Figs. 2 to 7 in that the LED filaments 4, 5, 6, 7, 8, 9, 11 are arranged in a spiraling manner. Especially, LED filaments 4, 5, 6, 7, 8, 9, 11 of the LED filament arrangement 3 configured to, in operation, provide LED filament light 41, 51, 61, 71, 81, 91, 111 of the same color are arranged in a spiraling manner in the LED filament arrangement 32. The LED filament arrangement 32 comprises a high number of LED filaments 4, 5, 6, 7, 8, 9, 11, such as for example about 50 LED filaments 4, 5, 6, 7, 8, 9, 11.2025PF80055

[0161] 19

[0162] As illustrated in Fig. 9, the LED filament arrangement 32 further differs from especially the LED filament arrangement 31 described above and shown in Figs. 6 and 7 in that the first row R1 is arranged in a spiral configuration, the second row R2 is arranged in a spiral configuration, and the third row R3 is arranged in a spiral configuration within the mesh structure. Alternatively, or additionally, and as illustrated in Fig. 9, the LED filament arrangement 32 may further differ from especially the LED filament arrangement 31 described above and shown in Figs. 6 and 7 in that the first row R1 is arranged in a circular configuration, the second row R2 is arranged in a circular configuration, and the third row R3 is arranged in a circular configuration within the mesh structure.

[0163] Fig. 11 shows a schematical top view of another LED filament arrangement 33 of a LED filament luminaire 1 according to the invention. Fig. 12 shows a schematical side view of the LED filament arrangement 33. The LED filament arrangement 33 differs from the LED filament arrangement 32 described above and shown in Figs. 8 to 10 in that it comprises a lower number of LED filaments 4, 5, 6, 7, 8, 9, 11, such as about twenty-five LED filaments 4, 5, 6, 7, 8, 9, 11 arranged in a meandering manner.

[0164] As illustrated in Fig. 11, the LED filament arrangement 33 further differs from especially the LED filament arrangements 31 and 32 described above and shown in Figs. 6 to 10 in that the first row R1 is arranged in a meandering configuration, the second row R2 is arranged in a meandering configuration, and the third row R3 is arranged in a meandering configuration within the mesh structure.

[0165] As may further be seen in Fig. 12, the LED filament arrangement 33 may be arranged between a tapered top luminaire part 13 and a tapered bottom luminaire part 14 of a LED filament luminaire 1 according to the invention. The tapered top luminaire part 13 may comprise optics. The optics may be selected from the group of light-diffusing optics, lightreflecting optics, light-refracting optics, light diffracting optics and light-converting optics. Alternatively, or additionally, the tapered bottom luminaire part 14 may comprise optics. The optics may be selected from the group of light-diffusing optics, light-reflecting optics, lightrefracting optics, light diffracting optics and light-converting optics.

[0166] Irrespective of the embodiment, the LED filament arrangement 3, 30, 31, 32, 33 may comprise a dome shape, a cone shape, a tapering shape, or any combination thereof.

[0167] 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.2025PF80055

[0168] 20

[0169] 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

2025PF8005521CLAIMS:

1. A LED filament luminaire (1) configured to provide, in operation, LED filament luminaire light (2), the LED filament luminaire comprising a LED filament arrangement (3) configured to provide, in operation, LED filament arrangement light (20), the LED filament arrangement (3) comprising:one or more first LED filaments (4) configured to provide, in operation, first LED filament light (41) having a first peak emission wavelength, I, in a first wavelength range from 400 nm to 500 nm;one or more second LED filaments (5) configured to provide, in operation, second LED filament light (51) having a second peak emission wavelength, X2, in a second wavelength range from 500 nm to 600 nm, wherein X2 > XI + 20 nm; andone or more third LED filaments (6) configured to provide, in operation, third LED filament light (61) having a third peak emission wavelength, X3, in a third wavelength range from 600 nm to 700 nm, wherein X3 > X2 + 20 nm;and, wherein the LED filament arrangement (3) further comprises at least two ofone or more fourth LED filaments (7) configured to provide, in operation, fourth LED filament light (71) having a fourth peak emission wavelength, X4, in a first wavelength range from 400 nm to 500 nm, wherein X4 < XI - 20 nm;one or more fifth LED filaments (8) configured to provide, in operation, fifth LED filament light (81) having a fifth peak emission wavelength, X5, in a second wavelength range from 500 nm to 600 nm, wherein X5 < X2 - 20 nm, and X5 > XI + 20 nm; andone or more sixth LED filaments (9) configured to provide, in operation, sixth LED filament light (91) having a sixth peak emission wavelength, X6, in a third wavelength range from 600 nm to 700 nm, wherein X6 > X3 + 20 nm;wherein the one or more first LED filaments (4), the one or more second LED filaments (5), the one or more third LED filaments (6), and if present, the one or more fourth LED filaments (7), the one or more fifth LED filaments (8), and the one or more sixth LED filaments (9) are arranged in a mesh configuration; and2025PF8005522wherein in a first operational mode the LED filament luminaire light (2) is white light having a correlated color temperature in a range from 2000 K to 6500 K and a color rendering index of at least 80.

2. A LED filament luminaire according to claim 1, wherein and, wherein the LED filament arrangement (1) further comprises a controller (10) configured to individually control the one or more first LED filament (4), the one or more second LED filament (5), the one or more third LED filament (6), and when provided, the one or more fourth LED filament (7), the one or more fifth LED filament (8) and the one or more sixth LED filament (9).

3. A LED filament luminaire according to claim 1 or 2, wherein the LED filament arrangement (3) comprises the one or more fourth LED filaments (7), the one or more fifth LED filaments (8), and the one or more sixth LED filaments (9).

4. A LED filament luminaire according to any one of the above claims, wherein the LED filament arrangement (3) comprises at least three first LED filaments (4), at least three second LED filaments (5), at least three third LED filaments (6), and when provided, at least three fourth LED filaments (7), and when provided, at least three fifth LED filaments (8) and when provided, at least three sixth LED filaments (9).

5. A LED filament luminaire according to any one of the above claims, wherein the LED filament arrangement (3) further comprises one or more seventh LED filaments (11) configured to, in operation, provide seventh LED filament light being white light having a correlated color temperature in a range from 1700 K to 6500 K.

6. A LED filament luminaire according to claim 5, wherein the LED filament arrangement (3) comprises at least three seventh LED filaments (11) having a correlated color temperature mutually different by at least 500 K.

7. A LED filament luminaire according to any one of the above claims, wherein two or more of the following applies:2025PF8005523LED filaments of one or more of the one or more first LED filaments (4) and the one or more fourth LED filaments (7) are electrically connected in series or in parallel via a first channel;LED filaments of one or more of the one or more second LED filaments (5) and the one or more fifth LED filaments (8) are electrically connected in series or in parallel via a second channel; andLED filaments of one or more of the one or more third LED filaments (6) and the one or more sixth LED filaments (9) are electrically connected in series or in parallel via a third channel.

8. A LED filament luminaire according to any one of the above claims, wherein two or more of the following applies:LED filaments of one or more of the one or more first LED filaments (4) and LED filaments of the one or more fourth LED filaments (7) are mechanically connected in a first row (Rl);LED filaments of one or more of the one or more second LED filaments (5) and LED filaments of the one or more fifth LED filaments (8) are mechanically connected in a second row (R2); andLED filaments of one or more of the one or more third LED filaments (6) and LED filaments of the one or more sixth LED filaments (9) are mechanically connected in a third row (R3).

9. A LED filament luminaire according to claim 8, wherein one of the following applies:the first row (Rl) is arranged in straight configuration, the second row (R2) is arranged in straight configuration, and the third row (R3) is arranged in straight configuration;the first row (Rl) is arranged in a spiral configuration, the second row (R2) is arranged in a spiral configuration, and the third row (R3) is arranged in a spiral configuration;the first row (Rl) is arranged in a meandering configuration, the second row (R2) is arranged in a meandering configuration, and the third row (R3) is arranged in a meandering configuration; and2025PF8005524the first row (Rl) is arranged in a circular configuration, the second row (R2) is arranged in a circular configuration, and the third row (R3) is arranged in a circular configuration.

10. A LED filament luminaire according to any one of the above claims, further comprising a tapered top luminaire part (13) and a tapered bottom luminaire part (14), wherein the LED filament arrangement (3) is arranged in between the tapered top luminaire part (13) and the tapered bottom luminaire part (14).

11. A LED filament luminaire according to claim 10, wherein at least one of the tapered top luminaire part (13) and the tapered bottom luminaire part (14) comprises optics selected from the group of light-diffusing optics, light-reflecting optics, light-refracting optics, light diffracting optics and light-converting optics.

12. A LED filament luminaire according to any one of the above claims, wherein the LED filament luminaire (1) further comprises a light exit window (104), the light exit window comprises a light redirector (105) configured to redirect the LED filament arrangement light into LED filament luminaire light.

13. A LED filament luminaire according to any one of the above claims, wherein one or more of the first LED filaments (4) and the fourth LED filaments (7) comprise at least two of K LED filaments configured to, in operation, provide violet LED filament light, K LED filaments configured to, in operation, provide royal blue LED filament light, and K LED filaments configured to, in operation, provide cyan LED filament light;one or more of the second LED filaments (5) and the fifth LED filaments (8) comprise at least two of M LED filaments configured to, in operation, provide green LED filament light, M LED filaments configured to, in operation, provide LED yellow filament light, and M LED filaments configured to, in operation, provide amber LED filament light;one or more of the third LED filaments (6) and the sixth LED filaments (9) comprise at least two of N LED filaments configured to, in operation, provide shortwavelength red LED filament light, N LED filaments configured to, in operation, provide medium-wavelength red LED filament light, and N LED filaments configured to, in operation, provide long-wavelength red LED filament light, andwherein K > 4, M > 4, and N > 4.2025PF800552514. A LED filament luminaire according to any one of the above claims, wherein in a second operational mode the LED filament luminaire light (2) is red light, in a third operational mode the LED filament luminaire light (2) is green light, and in a fourth operational mode the LED filament luminaire light (2) is blue light.

15. A control arrangement for controlling the LED filament luminaire according to any one of the above claims, the control arrangement comprising:a controller (10) configured to individually control the one or more first LED filament (4), the one or more second LED filament (5), the one or more third LED filament (6), and when provided, the one or more fourth LED filament (7), the one or more fifth LED filament (8), the one or more sixth LED filament (9), and the one or more sixth LED filament (11); anda user control element (15) connectable to the controller, the user control element (15) being configured to generate a user selected value from a range of user selectable values;wherein the controller (11) is configured to control the LED luminaire to provide, based on a first user selectable value in a first operational mode, first filament luminaire light being first white light having a first correlated color temperature, CCT1, and to provide based on a second user selectable value in a second operational mode second filament luminaire light being second white light having a second correlated color temperature, CCT2, wherein |CCT2-CCT1| < 300 K; andwherein first color points of the LED filaments providing the first white light are closer to the BBL compared to second color points of the LED filaments providing the second white light.

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