EP3354974A1 - Wide-angle linear led lighting device - Google Patents

Abstract

A wide-angle linear LED lighting device (3, 4) includes a polygonal lampshade (30, 40), a base (32, 42) and at least two LED modules (31, 41). The polygonal lampshade (30, 40) includes at least two lateral parts (30a, 30b, 40a, 40b) and an installation part (30d, 40c). The base (32, 42) is disposed within the polygonal lampshade (30, 40) and disposed on an inner surface (30d1) of the installation part (30d, 40c). There is an included angle (θ) between the base (32, 42) and the inner surface (30d1) of the installation part (30d, 40c). The at least two LED modules (31, 41) are disposed on the base (32, 42). The light beams emitted by the at least two LED modules (31, 41) are outputted from different lateral parts (30a, 30b, 40a, 40b) of the polygonal lampshade (30, 40). The light-outputting characteristics of the wide-angle linear LED lighting device (3, 4) are correlated with the included angle (θ) and the at least two LED modules (31,41).

Description

FIELD OF THE INVENTION
• The present invention relates to a lighting device, and more particularly to a wide-angle linear LED lighting device.
BACKGROUND OF THE INVENTION
• As known, light emitting diodes (LEDs) have many benefits such as high luminance, lower power consumption and long service life. Consequently, light emitting diodes have been widely used in general instruments, indicating lamps or lighting devices. In case that light emitting diodes are applied to a lighting device, the lighting device usually comprises a lighting module. The lighting module comprises plural light emitting diodes that are connected with each other in series or in parallel. Consequently, the light beams emitted by the lighting device have large coverage range and high brightness.
• FIG. 1A is a schematic perspective view illustrating a portion of a conventional linear LED lighting device. As shown inFIG. 1A, the conventional linearLED lighting device 1 comprises alampshade 10 and a LED module 11 (seeFIG. 1B). TheLED module 11 is covered by thelampshade 10. Thelampshade 10 is made of a transparent material. Moreover, plural textured structures (not shown) are formed on a surface of thelampshade 10, and a diffuser (not shown) is disposed within thelampshade 10. Due to the textured structures and the diffuser, a desired light pattern is produced.
• As shown inFIG. 1A, thelampshade 10 has a linear tube profile with a hollow square cross section. Please refer toFIG. 1B. FIG. 1B schematically illustrates some simulated light patterns generated by the conventional linear LED lighting device ofFIG. 1A. As shown inFIG. 1B, theLED module 11 is disposed within thelampshade 10. TheLED module 11 comprises plural light emitting diodes (not shown), and the plural light emitting diodes are arranged in a line. Moreover, the linear LED lighting device is equipped with optical elements (e.g., lenses) as a diffuser. By theLED module 11, the diffuser and thelampshade 10, the desired light pattern is produced.
• InFIG. 1B, three light patterns (a), (b) and (c) are shown. These light patterns (a), (b) and (c) are produced by three linearLED lighting devices 1, 1' and 1", respectively. The linearLED lighting device 1 comprises alampshade 10 or a corresponding diffuser. The linear LED lighting device 1' comprises a lampshade 10' or a corresponding diffuser. The linearLED lighting device 1" comprises alampshade 10" or a corresponding diffuser. Thelampshades 10, 10' and 10" have different textured structures or different type of diffusers. In the light pattern (a), the light intensity on periphery region is stronger and the light intensity on the middle region is weaker. In the light pattern (b), the light intensity is centralized to the middle region. In the light pattern (c), the light intensity in the coverage region of the light beams is uniform. In the light pattern (a), (b) or (c), the coverage range of the light beams is mainly located under the linear LED lighting device. Due to the angular limitations, the luminous efficiency is usually unsatisfied. Moreover, since the lampshade has special textured structures or an additional diffuser is needed, the fabricating cost of the conventional linear LED lighting device is high.
• FIG. 2A is a schematic perspective view illustrating the outer appearance of another conventional linear LED lighting device. As shown inFIG. 2A, the conventional linearLED lighting device 2 comprises alampshade 20 and aLED module 21. TheLED module 21 is arranged in a line. Thelampshade 20 has a linear tube profile with a hollow circular cross section. Thelampshade 20 is made of a translucent material. Consequently, thelampshade 20 is a hazy lampshade. Since the hazy lampshade has the curvy surface, the light beams from theLED module 21 are scattered more uniformly. Under this circumstance, it is not necessary to use an additional diffuser. In comparison with the linearLED lighting device 1 ofFIG. 1A, the fabricating cost of the linearLED lighting device 2 is lower.FIG. 2B is a diagram showing a simulated light intensity distribution generated by the conventional linear LED lighting device ofFIG. 2A. As shown inFIG. 2B, the linearLED lighting device 2 produces a circular light pattern. The circular light pattern is advantageous because of the optical uniformity. However, the linearLED lighting device 2 cannot emit the light beams in a wide-angle illumination manner or at a specified illumination angle. That is, the applications are limited.
• Therefore, there is a need of providing a wide-angle linear LED lighting device in order to solve the above drawbacks.
SUMMARY OF THE INVENTION
• An object of the present invention provides a wide-angle linear LED lighting device. The wide-angle linear LED lighting device comprises a polygonal lampshade, at least two LED modules and a base. The profile of the polygonal lampshade, the included angle between the base and an installation part of the polygonal lampshade and the height of the raised part are designed and matched, so that the beam angle is widened and the light beams are scattered at a wide angle. Moreover, the backside energy is increased, the spatial background brightness is increased, and the anti-glare function is achieved. Namely, the wide-angle linear LED lighting device having better light-outputting characteristics can be achieved.
• In accordance with an aspect of the present invention, there is provided a wide-angle linear LED lighting device. The wide-angle linear LED lighting device includes a polygonal lampshade, a base and at least two LED modules. The polygonal lampshade includes at least two lateral parts and an installation part. The base is disposed within the polygonal lampshade and disposed on an inner surface of the installation part. There is an included angle between the base and the inner surface of the installation part. The at least two LED modules are disposed on the base. The light beams emitted by the at least two LED modules are outputted from different lateral parts of the polygonal lampshade. The light-outputting characteristics of the wide-angle linear LED lighting device are correlated with the included angle and the at least two LED modules.
• The above contents of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1A is a schematic perspective view illustrating a portion of a conventional linear LED lighting device;
• FIG. 1B schematically illustrates some simulated light patterns generated by the conventional linear LED lighting device ofFIG. 1A;
• FIG. 2A is a schematic perspective view illustrating the outer appearance of another conventional linear LED lighting device;
• FIG. 2B is a diagram showing a simulated light intensity distribution generated by the conventional linear LED lighting device ofFIG. 2A;
• FIG. 3 is a schematic cross-sectional view illustrating a wide-angle linear LED lighting device according to a first embodiment of the present invention;
• FIGS. 4A,4B and 4C are schematic cross-sectional views illustrating three variant examples of the wide-angle linear LED lighting device ofFIG. 3;
• FIG. 5 is a schematic cross-sectional view illustrating a wide-angle linear LED lighting device according to a second embodiment of the present invention; and
• FIGS. 6A to 6F are diagrams showing some simulated light intensity distributions generated by the wide-angle linear LED lighting devices ofFIG. 3 andFIG. 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
• The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
• FIG. 3 is a schematic cross-sectional view illustrating a wide-angle linear LED lighting device according to a first embodiment of the present invention. As shown inFIG. 3, the wide-angle linearLED lighting device 3 comprises apolygonal lampshade 30, at least twoLED modules 31 and abase 32. Thepolygonal lampshade 30 comprises at least twolateral parts 30a and 30b and aninstallation part 30d. Thebase 32 is disposed within thepolygonal lampshade 30. Thebase 32 is disposed on an inner surface 30d1 of theinstallation part 30d. The at least twoLED modules 31 are disposed on thebase 32. The light beams emitted by the at least twoLED modules 31 are outputted from different lateral parts. Moreover, there is an included angle θ between the base 32 and the inner surface 30d1 of theinstallation part 30d. The light-outputting characteristics are correlated with the included angle θ and the at least twoLED modules 31. According to the included angle θ and the profile of thepolygonal lampshade 30, the at least twoLED modules 31 emit light beams at a wide angle. After the light beams pass through thepolygonal lampshade 30, the light beams are scattered more uniformly. Consequently, the backside energy is increased, and the spatial background brightness is enhanced.
• In this embodiment, the wide-angle linearLED lighting device 3 further comprises some other components such as a circuit board, a heat sink, a driver and a coupling structure. These components are well known to those skilled in the art. The positions of these components and the ways of installing these components may be varied according to the practical requirements.
• In this embodiment, thepolygonal lampshade 30 of the wide-angle linearLED lighting device 3 has a linear hollow tube profile with a hollow trapezoid cross section. In this embodiment, the cross section of thepolygonal lampshade 30 is defined by four parts, including a firstlateral part 30a, a secondlateral part 30b, afront part 30c and theinstallation part 30d. Thefront part 30c and theinstallation part 30d are opposed to each other. The firstlateral part 30a and the secondlateral part 30b are opposed to each other. It is noted that the profile of thepolygonal lampshade 30 is not restricted. For example, thepolygonal lampshade 30 has a hollow triangular cross section, a hollow quadrilateral cross section, a hollow pentagonal cross section or a hollow hexagonal cross section. Moreover, the hollow quadrilateral cross section of thepolygonal lampshade 30 is a hollow square cross section, a hollow rectangular cross section or a hollow trapezoid cross section. It is noted that numerous modifications and alterations may be made while retaining the teachings of the invention.
• In this embodiment, thefront part 30c is longer than theinstallation part 30d. Preferably but not exclusively, thepolygonal lampshade 30 is an integral structure, and thepolygonal lampshade 30 is made of a translucent plastic material. Theinstallation part 30d has the inner surface 30d1 and an outer surface 30d2. The inner surface 30d1 is disposed within thepolygonal lampshade 30. Thebase 32 is disposed on the inner surface 30d1 of theinstallation part 30d. The outer surface 30d2 of theinstallation part 30d faces a ceiling (not shown) or any other appropriate mounting surface.
• Please refer toFIG. 3 again. Thebase 32 is disposed within thepolygonal lampshade 30 and installed on the inner surface 30d1 of theinstallation part 30d. In this embodiment, thebase 32 comprises at least two slabs (e.g., afirst slab 32a and asecond slab 32b). Preferably but not exclusively, the at least two slabs of the base 32 are integrally formed into one piece, and thebase 32 is an aluminum extrusion base. The at least twoLED modules 31 includes afirst LED module 31a and asecond LED module 31b. Thefirst LED module 31a and thesecond LED module 31b are respectively disposed on thefirst slab 32a and thesecond slab 32b of thebase 32. By adjusting the installations and the heights of thefirst slab 32a and thesecond slab 32b of thebase 32, the installations and the heights of thefirst LED module 31a and thesecond LED module 31b are correspondingly adjusted. According to the adjusted installations and heights of thefirst LED module 31a and thesecond LED module 31b and the profile of thepolygonal lampshade 30, the wide-angle linearLED lighting device 3 produces a desired wide-angle light pattern. As shown inFIG. 3, the included angle θ is formed between thefirst slab 32a of thebase 32 and the inner surface 30d1 of theinstallation part 30d, and the included angle θ is formed between thesecond slab 32b of thebase 32 and the inner surface 30d1 of theinstallation part 30d. Preferably, the included angle θ is in the range between 0 and 90 degrees, and preferably in the range between 0 and 60 degrees or in the range between 60 and 90 degrees. For example, in case that the included angle θ is 0 degree, thefirst slab 32a and thesecond slab 32b of the base 32 are in close contact with the inner surface 30d1 of theinstallation part 30d.
• FIGS. 4A,4B and 4C are schematic cross-sectional views illustrating three variant examples of the wide-angle linear LED lighting device ofFIG. 3. As shown inFIG. 4A, the included angle θ1 between thefirst slab 32a (or thesecond slab 32b) of thebase 32 and the inner surface 30d1 of theinstallation part 30d is 60 degrees. As shown inFIG. 4B, the included angle θ2 between thefirst slab 32a (or thesecond slab 32b) of thebase 32 and the inner surface 30d1 of theinstallation part 30d is 75 degrees. As shown inFIG. 4C, the included angle θ3 between thefirst slab 32a (or thesecond slab 32b) of thebase 32 and the inner surface 30d1 of theinstallation part 30d is 90 degrees. In the example ofFIG. 4C, thefirst slab 32a and thesecond slab 32b of the base 32 are in parallel with each other. As the included angle θ is adjusted, the positions and orientations of thefirst LED module 31a and thesecond LED module 31b on thefirst slab 32a and thesecond slab 32b of the base 32 are adjusted according to the practical requirements.
• Please refer toFIG. 3. There is a distance h1 between thefirst LED module 31a (or thesecond LED module 31b) and the inner surface 30d1 of theinstallation part 30d. Preferably but not exclusively, the distance h1 is in the range between 0 and 30mm. Moreover, a distance h2 between thefront part 30c and theinstallation part 30d of thepolygonal lampshade 30 is a height of the wide-angle linearLED lighting device 3. Since the ratio h1/h2 and the profile of thepolygonal lampshade 30 can be designed according to the practical design, the light beams passing through thepolygonal lampshade 30 results in a wide-angle light pattern with enhanced backside energy. In some embodiments, the distance between thefirst slab 32a and thesecond slab 32b of thebase 32 is in the range between 0 and 20mm. Preferably but not exclusively, the distance between thefirst LED module 31a and thesecond LED module 31b is in the range between 0 and 20mm. The orientations, heights and relative distances of thebase 32 and theLED modules 31 may be varied according to the practical requirements.
• The way of fixing theLED modules 31 on thebase 32 is not restricted. As shown inFIG. 3, thefirst LED module 31a and thesecond LED module 31b are fixed on thefirst slab 32a and thesecond slab 32b of the base 32 through an engaging means. As shown inFIG. 4A, thefirst LED module 31a and thesecond LED module 31b are fixed on thefirst slab 32a and thesecond slab 32b of the base 32 through an adhesive (not shown).
• FIG. 5 is a schematic cross-sectional view illustrating a wide-angle linear LED lighting device according to a second embodiment of the present invention. As shown inFIG. 5, the wide-angle linearLED lighting device 4 comprises apolygonal lampshade 40, at least twoLED modules 41 and abase 42. In this embodiment, thepolygonal lampshade 40 of the wide-angle linearLED lighting device 4 has a linear hollow tube profile with a hollow triangular cross section. In this embodiment, the cross section of thepolygonal lampshade 40 is defined by three parts, including a firstlateral part 40a, a secondlateral part 40b and aninstallation part 40c. Thebase 42 is disposed on theinstallation part 40c. The at least twoLED modules 41 are disposed on thebase 42. In this embodiment, the at least twoLED modules 41 comprise afirst LED module 41a and asecond LED module 41b. The light beams emitted by thefirst LED module 41a are outputted from the firstlateral part 40a. The light beams emitted by thesecond LED module 41b are outputted from the secondlateral part 40b. Thebase 42 comprises afirst slab 42a, asecond slab 42b and a raisedpart 42c. Preferably but not exclusively, thefirst slab 42a, thesecond slab 42b and the raisedpart 42c of the base 42 are integrally formed into one piece, and thebase 42 is an aluminum extrusion base. In an embodiment, the raisedpart 42c comprises two additional slabs. Alternatively, in another embodiment, the raisedpart 42c is a heat sink (not shown). The example of the raisedpart 42c may be varied according to the practical requirements. Due to the raisedpart 42c, the altitudes of thefirst slab 42a and thesecond slab 42b are increased. Consequently, the distance between theLED module 41a (or theLED module 41b) and theinstallation part 40c is increased. As mentioned above, thepolygonal lampshade 40 has the hollow triangular cross section. After the light beams emitted by theLED modules 41 pass through the firstlateral part 40a and the secondlateral part 40b of thepolygonal lampshade 40, a wide-angle light pattern with increased backside energy is produced.
• FIGS. 6A to 6F are diagrams showing some simulated light intensity distributions generated by the wide-angle linear LED lighting devices ofFIG. 3 andFIG. 5. The light patterns ofFIGS. 6A, 6B and6C are generated by the wide-angle linear LED lighting device ofFIG. 3. For producing the light pattern ofFIG. 6A, thepolygonal lampshade 30 has a hollow trapezoid cross section, the included angle θ is 60 degree, and the h1/h2 ratio is 26.5%. For producing the light pattern ofFIG. 6B, thepolygonal lampshade 30 has a hollow trapezoid cross section, the included angle θ is 75 degree, and the h1/h2 ratio is 26.5%. For producing the light pattern ofFIG. 6C, thepolygonal lampshade 30 has a hollow trapezoid cross section, the included angle θ is 90 degree, and the h1/h2 ratio is 26.5%. Moreover, the wide-angle linear LED lighting device is further equipped with a raised part. The operating parameters of the wide-angle linear LED lighting device and the measured data of the light pattern are listed in following Table 1. For producing the light patterns ofFIGS. 6A, 6B and6C, thepolygonal lampshade 30 has the hollow trapezoid cross section and the height of the raised part is 13mm. The backside energy (%) of the light pattern ofFIG. 6A is 26.3%, the backside energy (%) of the light pattern ofFIG. 6B is 32.10%, and the backside energy (%) of the light pattern ofFIG. 6C is 46.10%. The beam angle of the light pattern ofFIG. 6A is 175 degrees, the beam angle of the light pattern ofFIG. 6B is 260 degrees, and the beam angle of the light pattern ofFIG. 6C is 323 degrees. When compared with the conventional technology, the beam angle and the backside energy of the light patterns produced by the wide-angle linear LED lighting device are increased. Consequently, the spatial background brightness is increased, and the anti-glare function is achieved.Table 1:

  Light pattern	FIG. 6A	FIG. 6B	FIG. 6C	FIG. 6D	FIG. 6E	FIG. 6F
  Lampshade	trapezoid	trapezoid	trapezoid	triangle	triangle	triangle
  Angle θ	60°	75°	90°	60°	60°	60°
  Raised part	13mm	13mm	13mm	0mm	6mm	13mm
  Relative position	26.5%	26.5%	26.5%	0%	13.6%	29.5%
  Backside energy (%)	26.3%	32.10%	46.10%	29.6%	27.3%	25.5%
  Beam angle	175	260	323	255	250	245
  Angle (max. light intensity)	0	0	107.5	60	60	60
  1/2 beam angle	87	130	161	127	125	122
  Light intensity (directly below)	204 cd/klm	175 cd/klm	109 cd/klm	162 cd/klm	167 cd/klm	168 cd/klm

• The light patterns ofFIGS. 6D,6E and 6F are generated by the wide-angle linear LED lighting device ofFIG. 5. For producing the light pattern ofFIG. 6D, thepolygonal lampshade 40 has a hollow triangular cross section, the included angle θ is 60 degree, and the height of the raised part is 0mm. For producing the light pattern ofFIG. 6E, thepolygonal lampshade 40 has a hollow triangular cross section, the included angle θ is 60 degree, and the height of the raised part is 6mm. For producing the light pattern ofFIG. 6F, thepolygonal lampshade 40 has a hollow triangular cross section, the included angle θ is 60 degree, and the height of the raised part is 13mm. As the height of the raised part is increased, the beam angle is decreased and the backside energy (%) is decreased, but the directly-below light intensity is increased.
• According to the simulated results ofFIGS. 6A to 6F and Table 1, the front side light intensity and the backside light intensity of the light pattern produced by the wide-angle linear LED lighting device of the present invention are adjustable according to the practical requirements.
• From the above descriptions, the present invention provides the wide-angle linear LED lighting device. The wide-angle linear LED lighting device comprises the polygonal lampshade, the at least two LED modules and the base. The profile of the polygonal lampshade, the included angle between the base and the installation part of the polygonal lampshade and the height of the raised part are designed and matched, the beam angle is widened and the light beams are scattered at a wide angle. Moreover, the light beams are scattered more uniformly, the backside energy is increased, the spatial background brightness is increased, and the anti-glare function is achieved. Since the wide-angle linear LED lighting device of the present invention has a simple structure and is easily installed, the fabricating cost is reduced.
• While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.

Claims (15)

1. A wide-angle linear LED lighting device (3, 4), comprising:

   a polygonal lampshade (30, 40) comprising at least two lateral parts (30a, 30b, 40a, 40b) and an installation part (30d, 40c);

   a base (32, 42) disposed within the polygonal lampshade (30, 40) and disposed on an inner surface (30d1) of the installation part (30d, 40c), wherein there is an included angle (θ) between the base (32, 42) and the inner surface (30d1) of the installation part (30d, 40c); and

   at least two LED modules (31, 41) disposed on the base (32, 42), wherein light beams emitted by the at least two LED modules (31, 41) are outputted from different lateral parts (30a, 30b, 40a, 40b),

   wherein light-outputting characteristics of the wide-angle linear LED lighting device (3, 4) are correlated with the included angle (θ) and the at least two LED modules (31, 41).
2. The wide-angle linear LED lighting device according to claim 1, wherein an outer surface (30d2) of the installation part (30d, 40c) faces a mounting surface.
3. The wide-angle linear LED lighting device according to claim 1 or 2, wherein a distance between each of the LED modules (31a, 31b, 41a, 41b) and the inner surface (30d1) of the installation part (30d, 40c) is in a range between 0 and 30mm.
4. The wide-angle linear LED lighting device according to any of the claims 1 to 3, wherein the base (32, 42) comprises at least two slabs (32a, 32b, 42a, 42b), and the at least two LED modules (31a, 31b, 41a, 41b) are disposed on the corresponding slabs (32a, 32b, 42a, 42b).
5. The wide-angle linear LED lighting device according to claim 4, wherein the at least two slabs (32a, 32b, 42a, 42b) of the base (32, 42) are integrally formed into one piece.
6. The wide-angle linear LED lighting device according to claim 4 or 5, wherein a distance between every two adjacent slabs (32a, 32b, 42a, 42b) of the base (32, 42) is in a range between 0 and 20mm.
7. The wide-angle linear LED lighting device according to any of the claims 4 to 6, wherein an included angle (θ) between each slab (32a, 32b, 42a, 42b) of the base (32, 42) and the inner surface (30d1) of the installation part (30d, 40c) is in a range between 0 and 90 degrees.
8. The wide-angle linear LED lighting device according to any of the claims 4 to 7, wherein an included angle (θ) between each slab (32a, 32b, 42a, 42b) of the base (32, 42) and the inner surface (30d1) of the installation part (30d, 40c) is in a range between 60 and 90 degrees.
9. The wide-angle linear LED lighting device according to any of the claims 4 to 8, wherein the at least two LED modules (31a, 31b, 41a, 41b) are fixed on the corresponding slabs (32a, 32b, 42a, 42b) of the base (32, 42) through an engaging means.
10. The wide-angle linear LED lighting device according to any of the claims 4 to 9, wherein the at least two LED modules (31a, 31b, 41a, 41b) are fixed on the corresponding slabs (32a, 32b, 42a, 42b) of the base (32, 42) through an adhesive.
11. The wide-angle linear LED lighting device according to any of the claims 4 to 10, wherein the base (42) further comprises a raised part (42c), and the at least two slabs (42a, 42b) are disposed on the raised part (42c), so that a distance between the at least two LED modules (41a, 41b) and the inner surface of the installation part (40c) is increased.
12. The wide-angle linear LED lighting device according to any of the claims 1 to 11, wherein the light-outputting characteristics of the wide-angle linear LED lighting device (3, 4) are further correlated with the profile of the polygonal lampshade (30, 40) and a distance between the at least two LED modules (31, 41) and the installation part (30d, 40c).
13. The wide-angle linear LED lighting device according to any of the claims 1 to 12, wherein the polygonal lampshade (40) has a linear hollow tube profile with a hollow triangular cross section, a hollow quadrilateral cross section, a hollow pentagonal cross section or a hollow hexagonal cross section.
14. The wide-angle linear LED lighting device according to any of the claims 1 to 13, wherein the polygonal lampshade (30) has a linear hollow tube profile with a hollow square cross section, a hollow rectangular cross section or a hollow trapezoid cross section.
15. The wide-angle linear LED lighting device according to any of the claims 1 to 14, wherein the polygonal lampshade (30, 40) is made of a translucent material.

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