LED filament lamp with spiral LED filament

Abstract

An LED filament luminaire (1) comprising: a reflector (2), a helical LED filament (3) comprising a plurality of LEDs (4) arranged on an elongate carrier and configured to emit LED light (5) in operation, the helical LED filament (3) being at least partially arranged in the reflector (2), the LED filament luminaire (1) being configured to emit LED filament luminaire light (7) through the light exit window (6) in operation, the spiral LED filament (3) comprises an LED filament pitch (PS), the reflector (2) comprises an inner surface (9), the inner surface (9) comprises a plurality of concave structures (8), the plurality of concave structures (8) are arranged in a spiral pattern comprising a concave structure pitch (PC), and the LED filament pitch PS corresponds to the concave structure pitch PC.

Description

Technical Field

[0001] The present invention relates to an LED filament lamp fixture, the LED filament lamp fixture comprising: a reflector; a spiral LED filament comprising a plurality of LEDs configured to emit LED light in operation, the spiral LED filament being at least partially arranged in the reflector; and a light exit window, the LED lamp being configured to emit light through the LEDs in operation. Background Technology

[0002] The lighting trend is towards LED filament lamps. LED filament lamps are lamps designed to resemble traditional incandescent bulbs, featuring a visible filament for aesthetic and light distribution purposes, but with the high efficiency of a light-emitting diode.

[0003] WO 2022 / 101152 A1 discloses an LED light unit for providing LED light, the LED light unit comprising a flexible printed circuit board (PCB) having a first longitudinal axis and a plurality of elongated light sources, each light source having a second longitudinal axis. The plurality of elongated light sources are arranged on the flexible PCB such that the second longitudinal axes of the plurality of elongated light sources are not parallel to the first longitudinal axis of the flexible PCB. The LED light unit also includes a carrier, and the flexible PCB is bent along the first longitudinal axis such that each of the elongated light sources is arranged in a generally arcuate shape, and the flexible PCB is subsequently at least partially attached to the carrier.

[0004] CN213177755 discloses an LED filament lamp, including a housing and at least one reflector disposed within the housing, wherein an LED filament is disposed at the center of the reflector. The LED filament lamp is characterized in that the LED filament includes at least one spiral strip filament, and a heat sink matching the shape of the spiral strip filament is disposed below the spiral strip filament.

[0005] The aim is to improve the performance, functionality, and / or appearance of LED filament lamps.

[0006] It is also desirable to provide an LED filament luminaire that provides good collimation and visibility of LED filaments, especially spiral LED filaments. Summary of the Invention

[0007] One object of the present invention is to overcome this problem and to provide an LED filament lamp with one or more improved performance, functionality and appearance.

[0008] It is also desirable to provide an LED filament luminaire that provides good collimation and visibility of LED filaments, especially spiral LED filaments.

[0009] According to a first aspect of the invention, this and other objects are achieved by an LED filament luminaire comprising: a reflector forming a reflective chamber defining a volume; a spiral LED filament comprising a plurality of LEDs arranged on an elongated carrier and configured to emit LED light in operation, the spiral LED filament being at least partially arranged in the reflector and surrounded by the volume; and a light exit window, the LED filament luminaire being configured to emit LED filament luminaire light through the light exit window in operation, wherein the spiral LED filament comprises an LED filament pitch PS, wherein the reflector comprises an inner surface comprising a plurality of concave structures, wherein the plurality of concave structures are arranged in a spiral pattern comprising a concave structure pitch PC, and wherein the LED filament pitch PS corresponds to the concave structure pitch PC.

[0010] As used herein, the term "corresponding," such as when used in a connection where the LED filament pitch PS corresponds to the concave structure pitch PL, is intended to mean equal to or within + / -2 mm, or equal to or within + / -1 mm, or equal to or within + / -0.5 mm.

[0011] As used here, the term LED filament pitch PS refers to the pitch of the loops of a spiral LED filament.

[0012] Therefore, and specifically by providing the inner surface of the reflector to include multiple concave structures, the multiple concave structures being arranged in a spiral pattern including the concave structure pitch PC, and the LED filament pitch PS corresponding to the concave structure pitch PC, the LED filament luminaire is provided with one or more of improved performance, functionality, and appearance.

[0013] In addition, this LED filament luminaire provides improved collimation of light and improved visibility of LED filaments, especially spiral LED filaments.

[0014] The reflector can be formed into a single reflective chamber to provide a reflector with a particularly simple structure, and the reflector can be integrally manufactured. The chamber forms a volume that can completely or at least partially surround the spiral filament.

[0015] LED filament pitch PS and concave structure pitch PL can have corresponding dimensions that are within + / -2mm, + / -1mm, + / -0.5mm, or equal to each other.

[0016] LED filament lamps include a longitudinal axis L, multiple concave structures can be arranged with concave structure angle θC relative to a transverse axis T extending perpendicular to the longitudinal axis L, and a spiral LED filament can be arranged with an LED filament angle θS relative to the transverse axis T, and the concave structure angle θC can correspond to the LED filament angle θS.

[0017] The concave structure angle θC and the LED filament angle θS can have corresponding dimensions that are within + / -2 degrees, + / -1 degree, + / -0.5 degrees, or equal to each other.

[0018] Therefore, an LED filament luminaire is provided that holds a spiral LED filament in place in a particularly simple, efficient, and durable manner. This LED filament luminaire also provides uniform and aesthetically pleasing light output. Furthermore, this LED filament luminaire is particularly easy to assemble.

[0019] The minimum distance D between the inner surface of the reflector and a portion of the spiral LED filament is at least 1 cm. Alternatively or additionally, the distance D may be less than 2 cm or less than 5 cm.

[0020] Therefore, an LED filament lamp is provided in which the spiral LED filament is particularly well visible when multiple LEDs are emitting light.

[0021] The spiral LED filament can be partially arranged in the reflector. Alternatively, half of the spiral LED filament can be arranged in the reflector.

[0022] Therefore, an LED filament lamp is provided, in which the spiral LED filament is visible at a wide viewing angle when multiple LEDs are lit.

[0023] The spiral LED filament can be completely recessed into the reflector.

[0024] Therefore, an LED filament lamp is provided, in which the collimation of the light from the LED filament lamp is improved to a particularly high degree.

[0025] The gap G can be set between the light emission window of the LED filament lamp and the LED filament portion closest to the light emission window, and the gap G can be less than 2cm. Alternatively, the gap G can be less than 1.5cm or less than 1cm. Alternatively or additionally, the gap G can be greater than 0.5cm or greater than 1cm.

[0026] Therefore, an LED filament lamp is provided in which the spiral LED filament is particularly well visible at a wide viewing angle when multiple LEDs are emitting light.

[0027] The reflector may taper toward the end opposite to the light exit window of the LED filament lamp. The tapered portion of the reflector may be elongated, and the cross-section of the reflector at or near the light exit window may be circular.

[0028] Therefore, an LED filament lamp is provided that can be adapted to customer preferences.

[0029] The spiral LED filament comprises multiple X rings, where X can be an integer in the range of 2 to 7. Alternatively, X can be an integer in the range of 2 to 6. Alternatively, X can be an integer in the range of 3 to 5.

[0030] It has been shown that this number of loops can be provided for spiral LED filaments to provide optimal fit with reflectors.

[0031] The reflector can be a specular reflector.

[0032] Therefore, an LED filament lamp is provided, in which the collimation of the light is improved to a particularly high degree, and further, in which light loss at the reflector surface is minimized.

[0033] Multiple concave structures can include parabolic shapes.

[0034] Therefore, an LED filament lamp is provided, in which the collimation of the light from the LED filament lamp is improved to a particularly high degree.

[0035] The LED filament pitch PS and concave structure pitch PC can be in the range of 0.5 to 5 cm, or in the range of 1 to 4 cm, or in the range of 1 to 3 cm.

[0036] By keeping the LED filament pitch PS and the concave structure pitch PC relatively small, LED filament lamps with more uniform light output are achieved.

[0037] The concave structure angle θC and the LED filament angle θS can be in the range of 2 to 45 degrees, or in the range of 4 to 35 degrees, or in the range of 5 to 30 degrees.

[0038] Therefore, LED filament luminaires offer improved performance and / or appearance. In particular, for such LED filament luminaires, the spiral LED filament is also highly visible at a relatively large viewing angle when multiple LEDs are emitting light.

[0039] The number of concave structures can be 2 to 7, 2 to 6, or 3 to 5.

[0040] Several concave structures have been shown to provide a good functional compromise between compact LED filament luminaires and improved performance and / or appearance.

[0041] The number of concave structures and the number of rings can be the same.

[0042] This provides an LED filament luminaire with a compact structure.

[0043] The LED filament can be arranged at least partially in multiple concave structures. Alternatively or additionally, the loop of the spiral LED filament can be located in the middle of the multiple concave structures.

[0044] Therefore, an LED filament lamp is provided, in which the spiral LED filament is visible at a wide viewing angle when multiple LEDs are lit.

[0045] Adjacent concave structures can be separated by the protruding parts of the reflector.

[0046] Therefore, an LED filament luminaire is provided that holds a spiral LED filament in place in a particularly simple, effective and durable manner.

[0047] The reflector can be a cup-shaped structure with a cavity for receiving a spiral LED filament.

[0048] Therefore, LED filament lamps have reflectors with a particularly simple structure. Furthermore, these LED filament lamps are exceptionally easy to assemble.

[0049] Adjacent concave structures of multiple concave structures can be connected to each other. More specifically, the sides of adjacent concave structures of multiple concave structures can be connected to each other.

[0050] Multiple concave structures can be arranged in a spiral pattern so that they face the light-emitting surface.

[0051] The light-emitting surface can be a flat surface. The light-emitting surface can include a diffuser.

[0052] LED filament lamps can be used as spotlights or downlights.

[0053] The present invention also relates to spotlights or downlights including LED filament lamps according to the present invention.

[0054] It should be noted that the present invention relates to all possible combinations of the features described in the claims. Attached Figure Description

[0055] This and other aspects of the invention will now be described in more detail with reference to the accompanying drawings, which illustrate embodiments of the invention.

[0056] Figure 1 A schematic perspective view of an LED filament luminaire according to the present invention is shown.

[0057] Figure 2 It shows that according to Figure 1 A top view of an LED filament lamp.

[0058] Figure 3 It shows that according to Figure 1 A cross-sectional side view of an LED filament lamp.

[0059] Figure 4 A schematic perspective view of a spotlight including an LED filament lamp according to the present invention is shown.

[0060] Figure 5 A schematic perspective view of another LED filament luminaire according to the present invention is shown.

[0061] Figure 6 A schematic perspective view of another LED filament luminaire according to the present invention is shown.

[0062] Figure 7 The diagram shows a polar plot of the intensity of the light output produced by a prior art LED filament luminaire with a bare LED filament.

[0063] Figure 8 A polar coordinate graph showing the intensity of the light output produced by the LED filament lamp according to the present invention is shown.

[0064] As shown in the figures, the dimensions of layers and regions are exaggerated for illustrative purposes; therefore, these dimensions are provided to illustrate the general structure of embodiments of the invention. The same reference numerals consistently denote the same elements. Detailed Implementation

[0065] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may 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 to fully convey the scope of the invention to those skilled in the art.

[0066] First refer to Figures 1 to 3 The present invention illustrates an LED filament lamp 1 according to the present invention. Figure 1 A schematic perspective view of the LED filament luminaire 1 is shown. Figure 2 A top view of the LED filament luminaire 1 is shown, and Figure 3 A cross-sectional side view of the LED filament luminaire 1 is shown.

[0067] Typically, and regardless of the embodiment, the LED filament lamp 1 includes a reflector 2, a spiral LED filament 3, and a light exit window 6. For example... Figure 2 As shown, LED 1 is configured to emit LED light 7 through light exit window 6 along the main emission direction M during operation.

[0068] The light exit window 6 can be a flat surface. The light exit window 6 can be an open surface. The light exit window 6 can be a transparent element. The light exit window 6 can include a diffuser.

[0069] The spiral LED filament 3 includes multiple LEDs 4 (see...) Figure 2 and Figure 3 The spiral LED filament 3 is at least partially arranged in the reflector 2. Specifically, half of the spiral LED filament 3 may be arranged in the reflector 2. Alternatively, the spiral LED filament 3 may be completely recessed in the reflector 2. The spiral LED filament 3 includes an LED filament pitch PS. The spiral LED filament 3 includes a plurality of X loops 13, where X is an integer, for example, ranging from 2 to 7, 2 to 6, or 3 to 5. In the illustrated embodiment, three loops 13 are provided.

[0070] Multiple LEDs 4 are configured to emit LED light 5 during operation (see...) Figure 2 and Figure 3 Multiple LEDs 4 can be any suitable type of LED, such as white LEDs or RGB LEDs. Multiple LEDs 4 can include any suitable number of LEDs.

[0071] Reflector 2 is specularly reflective. Reflector 2 can be made of a suitable metal, such as aluminum. Alternatively, reflector 2 may include a layer or coating of specularly reflective material. Reflector 2 can form a single reflective chamber. Alternatively, reflector 2 can be made into more than one component. Reflector 2 includes an inner surface 9. The inner surface 9 includes a plurality of concave structures 8. The plurality of concave structures 8 include a parabolic shape. Reflector 2 can be a cup-shaped structure having a cavity formed by the inner surface 9 and the plurality of concave structures 8 for receiving a spiral LED filament 3. The plurality of concave structures 8 are arranged in a spiral pattern, the spiral pattern including a concave structure pitch PC. The plurality of concave structures 8 are arranged in such a spiral pattern that they reflect light facing or primarily towards the light emitting surface 6. The LED filament pitch PS corresponds to the concave structure pitch PC. For example, the LED filament pitch PS and the concave structure pitch PC can be equal to each other. For example, the LED filament pitch PS and the concave structure pitch PC can both be in the range of 0.5 to 5 cm, 1 to 4 cm, or 1 to 3 cm. Adjacent concave structures 8 of multiple concave structures 8 can be connected to each other. More specifically, the sides of adjacent concave structures 8 of multiple concave structures 8 can be connected to each other.

[0072] The reflector 2 includes a first end 25 and a second end 12 opposite to the first end 25 and the light exit window 6, with the light exit window 6 of the LED filament luminaire 1 formed at the first end 25. The reflector 2 is cylindrical. Alternatively, the reflector 2 may taper toward the second end 12. If the reflector 2 is tapered, the taper portion of the reflector 2 may be elongated. The cross-section of the reflector 2 is circular at least near or at the exit window 6. The reflector 2 includes a plurality of concave structures 8 of number Y, where Y is, for example, an integer that may be equal to, the number X of, the plurality of loops 13 of the LED filament 3. For example, the number Y of the concave structures 8 may be 2 to 7, 2 to 6, or 3 to 5. In the illustrated embodiment, the number Y of the concave structures 8 is 3. Figures 1 to 3 In the illustrated embodiment, reflector 2 is open at both ends. That is, neither the first end 25 or the light exit window 6 nor the second end 12 includes any reflector portion or other surface element or portion. In other embodiments (e.g., see...) Figure 5 and Figure 6 One or both of the first end 25 and the second end 12 may be closed. Adjacent concave structures 8 may be separated by a ridge or protrusion 16 on the inner surface 9 of the reflector 2. Alternatively, the ridge or protrusion 16 on the inner surface 9 of the reflector 2 may form a boundary or boundary line between adjacent concave structures 8. Alternatively, the ridge or protrusion 16 on the inner surface 9 of the reflector 2 may form the side surface of two adjacent concave structures 8, or may connect two adjacent concave structures 8.

[0073] For details, please refer to the following: Figure 2 The LED lamp 1 also includes a longitudinal axis L and a transverse axis T. The transverse axis T extends perpendicular to the longitudinal axis L. Multiple concave structures 8 of the reflector 2 are arranged relative to the transverse axis T at a concave structure angle θC. A spiral LED filament 3 is arranged relative to the transverse axis T at an LED filament angle θS. The concave structure angle θC corresponds to the LED filament angle θS. For example, the concave structure angle θC and the LED filament angle θS can be equal to each other. For example, the concave structure angle θC and the LED filament angle θS can both be within the range of 2 to 45 degrees, 4 to 35 degrees, or 5 to 30 degrees. For example, the concave structure angle θC and the LED filament angle θS can differ from each other by a maximum of 0.5 degrees, 1 degree, or 2 degrees.

[0074] Special reference Figure 1 The reflector 2 and the LED filament 3 are sized such that, in the assembled state of the LED filament lamp 1, the shortest distance D between the inner surface 9 of the reflector 2 and the portion 10 of the spiral LED filament 3 is at least 1 cm. Optionally, the distance D can also be ensured to be less than 3 cm.

[0075] Special reference Figure 1The gap G is set between the light emission window 6 of the LED filament lamp 1 and the LED filament portion 11, with the LED filament portion 11 being closest to the light emission window 6 in the assembled state of the LED filament lamp 1. The gap G can be less than 2 cm.

[0076] Any LED filament lamp 1 according to the present invention can be used in a spotlight. Alternatively, any LED filament lamp 1 according to the present invention can be used in a downlight. Any LED filament lamp 1 according to the present invention can also be used in any other suitable type of lamp or lighting device.

[0077] Figure 4 As an example, a spotlight 20 including an LED filament luminaire 1 is shown. The spotlight 20 may also include a diffuser 15 and an edge 14. Both the diffuser 15 and the edge 14 are disposed on a reflector 2 at a light exit window 6. The diffuser 15 is used to convert the LED filament luminaire light 7 into diffused LED filament luminaire light 7'. The edge 14 is used to hold the diffuser 15 in place. The spotlight may also include a housing 17. The LED filament luminaire 1 is arranged in the housing 17. Therefore, in addition to the light exit window 6, the LED filament luminaire 1... Figure 4 The upper part is not visible. Edge 14 may form part of housing 17 or be integrally formed with housing 17. Spotlight 20 may also include terminals 19 for connection to an electrical power source such as mains power. Spotlight 20 may also include a locking mechanism 18, such as a spring lock, for mounting and holding spotlight 20 in place.

[0078] Figure 4 It is also shown that the housing 17 is configured to receive the reflector 2, which tapers towards the second end 12 of the reflector 2. For this purpose, the housing 17 also tapers towards the end 21 opposite to the diffuser 15 and the light exit window 6. This is in Figure 4 The housing 17 is shown with two diameters, d1 and d2, where d2 is smaller than d1. For example, d1 could be 185 mm and d2 could be 150 mm. The housing 17 also includes a height h, which is the shortest distance from edge 14 to end 21. For example, the height h could be 80 mm.

[0079] at last, Figure 4 The diffused LED filament luminaire light 7' is shown, which is emitted from the light emitting surface 6 and passes through the diffuser 15 along the main emission direction M.

[0080] Now go to Figure 5 A schematic perspective view of another LED filament luminaire 100 according to the present invention is shown. The LED filament luminaire 100 is related to the above-mentioned... Figures 1 to 3 The LED filament lamp 1 described differs only in the following features.

[0081] exist Figure 5In the illustrated embodiment, reflector 2 is closed at one end. That is, the first end 25 or light exit window 6 includes a surface element or portion 22 that closes the reflector 2. Similarly, the second end 12 includes a surface element or portion 23 that closes the reflector 2. The surface portion 22 may be transparent to allow the emission of LED light 7. Alternatively, the surface portion 22 may be a diffuser or include diffuse particles or surface elements to convert the LED filament light 7 into diffuse filament light 7'. The surface portion 23 may be made of the same material as reflector 2. Of course, it is also possible to omit either of the two surface portions 22 and 23 to provide a reflector 2 that is closed only at one end.

[0082] Now go to Figure 6 A schematic perspective view of another LED filament luminaire 101 according to the present invention is shown. The LED filament luminaire 101 is related to the above-mentioned... Figures 1 to 3 and Figure 5 The only difference between the LED filament lamps 1 and 100 described is the following features.

[0083] exist Figure 6 In the illustrated embodiment, the spiral LED filament 3 is completely recessed within the reflector 2. That is, no part of the spiral LED filament 3 protrudes beyond the upper edge 24 of the reflector 2.

[0084] exist Figure 6 In the illustrated embodiment, reflector 2 is closed-end. That is, the first end 25 or light exit window 6 includes a surface element or portion 22 that closes the reflector 2. Similarly, the second end 12 includes a surface element or portion 23 that closes the reflector 2. The surface portion 22 may be transparent to allow the emission of LED light 7. Alternatively, the surface portion 22 may be a diffuser or include diffuse particles or surface elements to convert the LED filament light 7 into diffuse filament light 7'. The surface portion 23 may be made of the same material as reflector 2. Of course, it is also possible to omit either of the two surface portions 22 and 23, such as providing a reflector 2 that is closed only at one end.

[0085] Finally, go to Figure 7 and Figure 8 The diagram shows two different polar plots of the intensity of the light output produced by an LED filament lamp. Figure 7 The diagram shows a polar plot of the intensity of the light output produced by a prior art LED filament luminaire with a bare LED filament. Figure 8 A polar graph showing the intensity of the light output produced by the LED filament lamp 1, 100 or 101 according to the present invention is shown.

[0086] By comparison Figure 7 and Figure 8It can be seen that the LED filament lamps 1, 100 or 101 according to the present invention provide significantly improved light output in terms of collimation and visibility of the spiral LED filament 3.

[0087] Those skilled in the art will recognize that the present invention is by no means limited to the preferred embodiments described above. Rather, many modifications and variations are possible within the scope of the appended claims.

[0088] Furthermore, by studying the accompanying drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments in practicing the claimed invention. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plurality. The fact that certain measures are recited in mutually different dependent claims does not imply that combinations of these measures cannot be advantageously used.

Claims

1. An LED filament lamp (1), comprising: The reflector (2) forms a reflective chamber with a defined volume. A spiral LED filament (3) having multiple loops, the spiral LED filament comprising multiple LEDs (4) arranged on an elongated carrier and configured to emit LED light (5) during operation, the spiral LED filament being at least partially arranged in the reflector and surrounded by the volume, and A light exit window (6) is provided, wherein the LED filament luminaire is configured to emit LED filament luminaire light (7) that passes through the light exit window during operation. The spiral LED filament (3) includes an LED filament pitch (PS), which is defined as the pitch of the ring, wherein... The reflector (2) includes an inner surface (9) which includes a plurality of concave structures (8). The plurality of concave structures (8) are arranged in a spiral pattern including the concave structure pitch (PC), and The LED filament pitch (PS) corresponds to the concave structure pitch (PC), and The LED filament lamp includes a longitudinal axis (L), wherein the plurality of concave structures (8) are arranged to form a concave structure angle (θC) relative to a transverse axis (T) extending perpendicular to the longitudinal axis (L), wherein the spiral LED filament (3) is arranged to form an LED filament angle (θS) relative to the transverse axis (T), and wherein the concave structure angle (θC) corresponds to the LED filament angle (θS).

2. The LED filament lamp according to claim 1, wherein the shortest distance (D) between the inner surface (9) of the reflector (2) and a portion (10) of the spiral LED filament (3) is at least 1 cm.

3. The LED filament lamp according to claim 2, wherein the distance (D) is less than 5cm.

4. The LED filament lamp according to any one of the preceding claims, wherein the spiral LED filament (3) is partially arranged in the reflector (2), or wherein half of the spiral LED filament is arranged in the reflector.

5. The LED filament lamp according to any one of claims 1 to 3, wherein the spiral LED filament (3) is completely recessed in the reflector (2).

6. The LED filament lamp according to claim 5, wherein the gap (G) is disposed between the light emission window (6) of the LED filament lamp and the LED filament portion (11) closest to the light emission window, and wherein the gap (G) is less than 2 cm.

7. The LED lamp according to any one of the preceding claims, wherein the reflector (2) tapers toward an end (12) opposite to the light exit window (6) of the LED filament lamp, wherein the taper portion of the reflector is elongated, and wherein the reflector (2) has a circular cross-section near or at the light exit window (6).

8. The LED lamp according to any one of the preceding claims, wherein the spiral LED filament (3) comprises a plurality of X rings (13), wherein X is an integer in the range of 2 to 7, and / or wherein the number of concave structures (8) is from 2 to 7.

9. The LED lamp according to any one of the preceding claims, wherein the reflector (2) is specularly reflective.

10. The LED lamp according to any one of the preceding claims, wherein the plurality of concave structures (8) comprises a parabolic shape.

11. The LED lamp according to any one of the preceding claims, wherein the LED filament pitch (PS) and the concave structure pitch (PC) are in the range of 0.5 cm to 5 cm.

12. The LED lamp according to any one of the preceding claims, wherein the concave structure angle (θC) and the LED filament angle (θS) are in the range of 2 to 45 degrees.

13. The LED filament luminaire according to any one of the preceding claims, wherein the LED filament is at least partially arranged in the plurality of concave structures (8), and / or wherein the loop (13) of the spiral LED filament is located in the middle of the plurality of concave structures (8).

14. A spotlight or downlight comprising an LED filament luminaire (1) according to any one of the preceding claims.

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