JP2007012288A - Lighting device and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system capable of providing predetermined illuminance and enhancing reliability by effectively radiating heat generated from semiconductor light emitting elements, and capable of changing the emission direction of light, and to provide a luminaire. <P>SOLUTION: This lighting system comprises: the semiconductor light emitting elements 11; a light source body 12 supporting the semiconductor light emitting elements 11 and composed by having thermal conductivity; a cover member 13 supporting the light source body 12 with a lighting circuit 15 for lighting the semiconductor light emitting elements 11 housed therein; and a base member 14 supported by the cover member 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a lighting device and a lighting fixture using a semiconductor light emitting element such as a light emitting diode as a light source.

  In recent years, instead of filament light bulbs, lamps that use light-emitting diodes, which are semiconductor light-emitting elements that have a long lifetime and low power consumption, have come to be used as light sources for various lighting fixtures (for example, patent documents). 1 and Patent Document 2).

  However, the light emitting diode generates a relatively large amount of heat when it is turned on, and this temperature rise causes a reduction in luminous efficiency and a decrease in luminous flux, resulting in a problem that a predetermined illuminance cannot be obtained.

  In order to solve this problem, as disclosed in Patent Document 1 and the like, heat dissipation of a light-emitting diode is improved and reduction in light emission efficiency is suppressed.

Further, since the light emitting diode has the performance of a narrow-angle light distribution light source and generally has good light straightness, it is desired to be able to easily and freely convert the light irradiation direction.
Japanese Patent Laid-Open No. 2001-243809 JP 2004-103443 A

  However, in Patent Document 1, a metal substrate is provided inside a trumpet-shaped metal heat dissipating part configured to form a substantially spherical body together with a translucent cover, a light emitting diode is mounted on the metal substrate, and a light emitting diode is generated. It is the LED light bulb comprised so that the heat to perform may be transmitted to a trumpet-shaped metal thermal radiation part via a high heat conductive member.

  For this reason, the temperature of the whole trumpet-shaped metal heat dissipating part that also serves as a case part as a light bulb becomes high, and the temperature of the internal space of the trumpet-shaped metal heat dissipating part increases.

  As shown in Patent Document 2 and the like, the internal space of the trumpet-shaped metal heat radiating portion houses a power supply device for controlling the lighting of the light emitting diode, that is, circuit components constituting the lighting circuit. When the temperature rises, the circuit components are heated, causing a circuit failure and impairing reliability.

  In addition, as in Patent Document 1 and Patent Document 2, in this type of LED bulb, the metal substrate on which the light emitting diode is mounted is fixed to a trumpet-shaped metal heat dissipating portion that also serves as a main body case portion, and the LED bulb is used as a lighting fixture. When the socket is mounted, the light irradiation direction is fixed, and there is a problem that the optimum illumination cannot be performed in a desired direction.

  The present invention has been made in view of the above-mentioned problems and problems, and effectively releases heat generated from a semiconductor light emitting element to obtain a predetermined illuminance, and further improves reliability, and further, a light irradiation direction. It is an object of the present invention to provide an illuminating device and a luminaire that can change the illuminance.

The invention of the lighting device according to claim 1 includes: a semiconductor light emitting element; a light source body configured to support the semiconductor light emitting element and have thermal conductivity; and a lighting circuit that supports the light source body and lights the semiconductor light emitting element. And a cap member supported by the cover member.

  According to the first aspect of the present invention, the light source body configured to support the semiconductor light emitting element and have thermal conductivity effectively dissipates heat generated from the semiconductor light emitting element to obtain a predetermined illuminance. Thus, a lighting device with improved reliability is configured.

  Furthermore, by supporting the light source body on the cover member that houses the lighting circuit, the light source body can be configured as a separate component from the cover member, and the light source body can be rotated with respect to the cover member. An illuminating device that can be moved by moving the light emitting diode and that can change the light irradiation direction of the light emitting diode is configured.

  The “semiconductor light emitting device” is a light emitting device made of a semiconductor having no filament, and for example, a light emitting diode or a semiconductor laser is allowed.

  “Light source body with thermal conductivity” is allowed to be composed of a metal with good thermal conductivity such as aluminum, but the synthetic resin material is coated with a metal film such as aluminum or aluminum What coated foil etc. may be sufficient and the material is not limited to a specific thing.

  A semiconductor light emitting element, for example, a light emitting diode, is generally composed of a printed board on which a chip element is mounted and a heat sink made of aluminum or the like provided on the back surface of the printed board. Further, the light source body may be constituted by the light-emitting diode radiating plate itself.

  “The cover member that houses the lighting circuit that supports the light source and lights the semiconductor light emitting element” is a box-like material made of a metal with good thermal conductivity such as aluminum, or heat resistant and electrically insulating. A synthetic resin may be used, and the material is not limited.

  The internal state in which the lighting circuit is accommodated may be airtight or may be in communication with the outside by forming air holes for heat dissipation.

  The lighting circuit has a power supply circuit for lighting the semiconductor light emitting element, but may have a dimming circuit for dimming the semiconductor light emitting element.

  According to a second aspect of the present invention, in the illumination device according to the first aspect, the light source body is made of a metal having a light-transmitting portion that transmits light.

  According to the second aspect of the present invention, since the light source body is made of a metal having a light transmitting portion that transmits light, the heat generated from the semiconductor light emitting element is effectively radiated to obtain a predetermined illuminance. In addition, a lighting device with improved reliability is configured.

  The translucent portion is a means for providing a light source made of a transparent or translucent member that transmits light to a metal light source body, or providing an opening or the like so that light of the semiconductor light emitting element is emitted to the outside. In addition, an optical path control means made of a transparent lens body or the like is provided in the translucent part to allow light to be emitted by controlling the light distribution.

  According to a third aspect of the present invention, in the illumination device according to the first or second aspect, the light source body is rotatably supported with respect to the cover member.

According to the invention described in claim 3, since the light source body is rotatably supported with respect to the cover member, an illuminating device capable of changing the light irradiation direction is configured.

  Supporting the pivoting means that the light source body rotates and moves with respect to the cover member, so that the pivoting direction pivots up and down or left and right around the pivot axis. It is possible to rotate in any direction over an angle range of 360 degrees, or to move and rotate while the outer surface of the sphere of the light source body is in sliding contact with the inner surface of the sphere without a rotation axis. Well, the direction of rotation, the angular range of rotation, and the specific means for rotating are not particularly limited.

  The invention of the lighting apparatus according to claim 4 is characterized in that the lighting device according to any one of claims 1 to 3 is used.

  According to the fourth aspect of the present invention, there is configured a lighting fixture that is highly reliable and that can change the direction of light irradiation.

  According to the first aspect of the present invention, the heat generated from the semiconductor light emitting element is effectively separated by the light source body configured to support the semiconductor light emitting element and have thermal conductivity to be separated from the cover member housing the lighting circuit. It is possible to provide an illuminating device that can obtain a predetermined illuminance by dissipating heat and improve the reliability and change the direction of light irradiation.

  According to the invention of claim 2, since the light source body is made of a metal having a translucent part that transmits light, the heat generated from the semiconductor light emitting element is effectively radiated to obtain a predetermined illuminance. A lighting device with high reliability can be provided.

  According to invention of Claim 3, since the said light source body was supported rotatably with respect to the cover member, the illuminating device which can change the irradiation direction of light can be provided.

  According to the invention of claim 4, it is possible to provide a lighting apparatus that is highly reliable and that can change the direction of light irradiation.

  Hereinafter, embodiments of a lighting device and a lighting fixture according to the present invention will be described.

  1 to 3 show a lighting device according to an embodiment of the present invention, FIG. 1 is a longitudinal sectional view, FIG. 2 is a front view, and FIG. 3 shows a lighting circuit and brightness characteristics of the lighting device. a) is a schematic circuit diagram, and (b) is a characteristic curve diagram.

  FIG. 4 is an explanatory view schematically showing a lighting fixture as a spotlight installed on a ceiling surface, showing a lighting fixture according to an embodiment of the present invention.

  FIG. 5 is a longitudinal sectional view showing a modification of the illumination device according to the embodiment of the present invention, FIG. 6 is a longitudinal sectional view showing another modification of the illumination device, and FIG. 7 is still another modification of the illumination device. FIG.

  The illumination device according to the present embodiment is configured as a light bulb-type LED lamp used for a spotlight or the like for illuminating an exhibit such as a store display or a show window. The illumination device 10 includes a semiconductor light emitting element 11, a light source The body 12, the cover member 13, and the base member 14 are configured.

  In the following description, the light source body 12 is on the upper side and the base member 14 is on the lower side.

  The semiconductor light emitting element 11 is composed of a light emitting diode (hereinafter referred to as “LED”), and a plurality of LEDs 11 of the same color, in this embodiment, white LEDs are prepared, and each LED mainly emits light in one direction. Consists of the same kind of performance.

  Each LED 11 has a disk-shaped printed circuit board 11a in which a plurality of chip elements are concentrically mounted over a plurality of rows, and heat dissipation made of a metal having good thermal conductivity such as aluminum provided in contact with the back surface of the printed circuit board. It consists of a plate 11b. The heat sink 11b is configured in a disk shape that is the same shape as the printed circuit board.

  Reference numeral 12 denotes a light source body configured to support the LED 11 and have thermal conductivity. The heat sink has a short cylindrical box shape made of a metal having good thermal conductivity such as aluminum and has a substantially circular cross section. And a translucent body 12c provided so as to close the opening 12b of the case.

  The translucent body 12c constitutes a translucent part for radiating the light of the LED 11 to the outside. The translucent body 12c is made of a synthetic resin such as a colorless and transparent polycarbonate and has a substantially circular dish shape having a diameter approximately the same as that of the case 12a. Configure and screw into the opening 12b of the case.

  A circular concave portion 12d is formed on the inner bottom surface of the case 12a of the light source body, and a heat radiating plate 11b having a disk shape of the LED 11 is fitted into the circular concave portion 12d, and is fixed from the upper surface of the printed board 11a with screws or the like.

  Thereby, the light source body 12 in which the overall appearance shape forms a substantially disk shape is configured.

  Reference numeral 13 denotes a cover member that houses the lighting circuit 15 that supports the light source body 12 and lights the LED 11, and is formed of an integrally molded product of metal having good thermal conductivity such as aluminum.

  The cover member 13 has an opening 13a having a large diameter at the upper end and an opening 13b having a small diameter at the lower end, and a partition 13d is provided so as to form a recess 13c in the internal space.

  Further, the outer peripheral surface forms a substantially conical tapered surface whose diameter gradually decreases from the upper end to the lower end, so that the appearance approximates the silhouette of a general incandescent bulb.

  A shallow recess 13e is formed in the upper opening 13a with the upper surface of the partition wall 13d, and the light source body 12 is fitted and supported in the recess 13e.

  That is, the inner diameter dimension of the opening 13a is configured to be larger than the outer diameter dimension of the light source body 12 having a disc shape, and when the light source body is fitted into the recess 13e, the outer peripheral surface of the light source body and the inner peripheral surface of the recess A gap a is formed between the two.

  Further, two shaft pins 13 f and 13 f are provided from the outer surface of the opening 13 a to the outer surface of the light source body 12. The shaft pin 13f is provided at a position facing the circular opening 13a and the light source body 12 at an angle of 180 degrees with respect to the radial direction of the light source body 12, and the light source body 12 faces the opening 13a of the cover member 13 with these two shafts. The pins 13f and 13f are configured to be inclined and rotated over a predetermined angle A (FIG. 2).

  The two shaft pins 13f and 13f are made of a metal such as stainless steel, one end of the shaft pin 13f is integrally embedded in the inner peripheral surface of the opening 13a, and the other end protrudes from the inner surface of the opening. A shaft hole formed on the outer surface of the light source body 12 is fitted into the pin and is rotatably supported.

  An insulating case 16 is fitted in the recess 13c of the cover member 13, and the circuit board 15a of the lighting circuit 15 is fitted and supported in the insulating case.

  The insulating case 16 is formed into a bottomed cylindrical shape with a heat-resistant and electrically insulating synthetic resin such as polybutylene terephthalanol (PBT), and is fitted into the recess 13c to be heat-resistant such as silicone. Fix with the adhesive.

  The circuit board 15a is formed of a disk-shaped printed board, and is mounted with a circuit component 15b constituting the lighting circuit 15 for controlling the lighting of the LED 11. The circuit board 15a is fitted in the insulating case 16 and has heat resistance such as silicone. Secure with adhesive.

  The output terminal of the lighting circuit 15 is connected to the input terminal of the LED 11 provided on the light source body 12 by a lead wire 15c.

  The lead wire 15c is drawn out and connected to the light source body 12 through a through hole 17 formed in the insulating case 16 and the partition wall 13d.

  The through-hole 17 is closed with a heat-resistant adhesive such as silicone after the lead wire 15 c is pulled out, and a part of the heat radiated from the light source body 12 enters the insulating case 16 through the through-hole 17. It may be prevented from entering.

  Reference numeral 14 denotes a cap member supported by the cover member 13, and is connected to the opening 13 b at the lower end of the cover member 13 via a connecting member 18.

  Like the insulating case 16, the connecting member 18 is made of a heat-resistant and electrically insulating synthetic resin such as polybutylene terephthalanol (PBT) and has a cylindrical shape with openings 18a and 18b formed at both ends. .

  A ring-shaped locking projection 18c is formed on the outer peripheral surface of the upper end opening 18a, and is fitted into the locking groove 13g formed on the inner peripheral surface of the lower end opening 13b of the cover member 13 by utilizing the elasticity of the resin. The connecting member 18 is fixed to the cover member 13 by engaging.

  The base member 14 is fitted to the outer peripheral surface of the lower end opening 18b of the connecting member, and is fixed using a heat-resistant adhesive such as caulking or silicone.

  The base member 14 is made of a conductive metal and is screwed into a socket of a lighting fixture connected to a commercial power supply. For example, the base member 14 is made of an E26 type base, and a space portion 14a is formed on the inner surface and a male screw 14b on the outer surface. Form.

  Both terminal portions of the base member 14 and the input terminal of the circuit board 15a are connected by lead wires.

  The lighting circuit 15 includes a power supply circuit 15c and a light control circuit 15d as schematically shown in FIG.

The dimming circuit 15d includes an analog signal generation circuit 15e, a sawtooth wave generation circuit 15f, and a comparator 15g. An arbitrarily variable DC voltage generated from the analog signal generation circuit and a modified saw generated from the sawtooth wave generation circuit 15f. A wave (waveform indicated by w1 in FIG. 3) is compared by a comparator 15g to generate a PWM signal, and the photocoupler 15h of the power supply circuit 15c is turned on / off by this PWM signal to dim the LED 11.

  The brightness characteristic of the LED when the voltage value of the DC voltage in this light control is changed becomes a characteristic curve as shown in FIG. 3B, and a better lighting effect is performed at a place where the brightness of the LED is low. Therefore, fine brightness control in the vicinity of the light emission of the LED becomes possible, and a high lighting effect can be achieved.

  Further, as indicated by w2 in FIG. 3A, an analog effect is set to a constant voltage and the frequency of the sawtooth wave is changed, thereby making it possible to produce an illumination effect that moves like a candle flickering.

  When the lighting device 10 configured as described above is turned on, the LED 11 emits light, and light is emitted from the light transmitting body 12c of the light source body 12 to perform predetermined illumination.

  At this time, of the light emitted from the LED, the light diffused in the peripheral direction without going straight is reflected by the inner surface of the case 12a of the light source body 12 made of glossy aluminum and radiated from the translucent body 12c without light loss. Is done.

  In addition, when the display device is directly irradiated with light after the lighting device 10 is mounted on the socket of the lighting fixture, the light source body 12 is rotated around the shaft pin 13f as shown in FIG. Tilt to use.

  When the LED 11 continues to emit light, heat is generated. In addition to the cooling action by convection in the light source body 12, this heat is directly conducted to the heat sink 11b and the case 12a made of aluminum, and is effectively released to the outside from the outer peripheral surface of the case 12a, thereby suppressing the temperature rise of the LED. To do.

  The light source body 12 having the LED 11 as a heat generation source is configured as a separate part from the cover member 13 housing the lighting circuit 15, and both are connected only by a small shaft pin, and the gap a Therefore, the heat of the LED 11 is not transmitted from the light source body 12 to the cover member 13.

  Next, the structure of the lighting fixture which used the illuminating device comprised as mentioned above as a light source is demonstrated.

  As shown in FIG. 4, 20 is a spotlight movably installed on a wiring rail 21 provided on a ceiling surface X of a store or the like, mechanically engaged with the rail, and electrically connected to the rail conductor. It comprises the socket 22 provided with the member for doing, and the illuminating device 10 of this invention with which the socket was mounted | worn.

  The spotlight 20 configured as described above can move in a linear direction along the rail 21, and the light source body 12 of the lighting device 10 can be rotated at a predetermined angle over the irradiation range indicated by the solid line and the alternate long and short dash line in FIG. Since the light source body 12 can be moved, the light source body 12 is freely tilted and used in accordance with the position of the exhibit so as to obtain an effective lighting effect.

  Further, when it is necessary to enhance the lighting effect, the dimming circuit of the lighting circuit 15 is adjusted, and an illumination effect with movement such as a candle flickering is performed on the exhibit.

  As mentioned above, in this embodiment, although each LED11 was comprised with white, according to the use of a lighting fixture, you may comprise red, yellow, green, etc., and also combining various colors.

Each LED 11 supported the heat sink 11b of the LED in contact with the case 12a.
The heat radiating plate 11b of D may be configured to have a large size so that the case 12a constituting the light source body 12 is formed.

  The translucent portion 12c is made of a colorless and transparent synthetic resin. However, the translucent portion 12c may be colored in various colors as described above, or may be translucent, not completely transparent, and the material is not limited to the synthetic resin. You may comprise with the tempered glass etc. which have. Further, a lens function may be provided.

  Although the light source body 12 is configured to have a disk shape by the case 12a and the translucent body 12c, it may be configured to have a substantially spherical shape as shown as a modification in FIG.

  That is, the translucent body 12c is formed in a hollow hemispherical shape, and the aluminum case 12a is constituted by a hollow hemispherical lower case 12a1 and a disk-shaped middle case 12a2 for supporting the LED 11, and an opening of the lower case The inner case 12a2 supporting the LED is screwed and fixed to the inner surface of 12b, and a hemispherical transparent body 12c is covered so as to close the opening 12b of the lower case from above, and is fixed by screwing. You may comprise the light source body 12 which makes | forms.

  The light source body 12 is pivotally fixed to the opening portion 13a of the cover member 13 by two shaft pins 13f in the same manner as in the above embodiment.

  According to this configuration, the light source body 12 has a substantially spherical shape, the internal space can be widened, the external surface area can be increased, and the heat of the LED can be emitted to the outside more effectively.

  Moreover, since the light source body 12 which makes a substantially spherical body rotates about the shaft pin 13f, the rotation angle can be increased and the light irradiation direction can be changed more freely.

  Further, as shown in the modified example of FIG. 6, the case 12a includes a hollow hemispherical upper case 12a3, a hollow hemispherical lower case 12a1 and a disk-shaped middle case 12a2 for supporting the LED 11, and the upper case An opening 12a4 serving as a translucent part is provided at the top of the lens, and a translucent body 12c such as a small-diameter lens is fitted into the opening, and can be rotated to the opening 13a of the cover member 13 by two shaft pins 13f. The shaft may be fixed like this.

  Furthermore, as shown in FIG. 7 as a modified example, instead of the means using the two shaft pins 13f, a spherical hole 12e is formed on the lower surface of the lower case 12a1, as a shaft-stopping configuration of the light source body 12 having a spherical shape. The hole 13d may be provided upright on the upper surface of the partition wall 13d of the cover member 13, and a shaft 13f2 having a sphere 13f1 shaped to match the sphere of the hole 12e may be inserted at the tip.

  According to this configuration, the light source body 12 can be rotated over an angle range of 360 degrees when viewed from above by fitting the shaft sphere 13f1 and the sphere of the hole 12e, and the light irradiation direction can be freely performed. Can be changed.

  5 to 7 are the same as those of the present embodiment shown in FIGS. 1 to 4, and the same portions are denoted by the same reference numerals.

  In addition, the cover member 13 is made of a metal having good thermal conductivity such as aluminum, but may be made of a synthetic resin having heat resistance and electrical insulation.

  The base is not limited to the E26 type, but may be an Edison base such as the E17 type. Further, it may be a base having a terminal pin used for a known compact fluorescent lamp or a base having an L-shaped terminal used for a known sealing rosette system.

  Although the lighting fixture of this embodiment was configured as a spotlight, the number of LEDs used may be increased or decreased to be configured as various types of lighting fixtures for home use, for stores, facilities, and business use.

  According to the present embodiment, the heat generated by the LED 11 is directly conducted to the heat radiating plate 11b and the case 12a made of aluminum in addition to the cooling action by convection in the light source body 12, and effectively from the outer peripheral surface of the case 12a. It is released to the outside to suppress the LED temperature rise.

  Thereby, predetermined | prescribed illumination intensity can be obtained, without the luminous efficiency falling as LED.

  Since the light source body 12 is configured as a separate part from the cover member 13 housing the lighting circuit 15, the heat of the LED is not transmitted from the light source body 12 to the cover member 13.

  As a result, the temperature of the component 15b of the lighting circuit 15 is not increased by being heated by the heat from the LED, and the cause of the circuit failure is removed, so that the reliability is improved and the lifetime is prevented from being lowered.

  Since the light source body 12 is configured as a separate part from the cover member 13 that houses the lighting circuit 15, and the light source body 12 can be rotated, a direction that requires illumination as necessary. Thus, it is possible to provide an illumination device that can be freely tilted and can change the irradiation direction of light.

  Furthermore, the lighting control circuit of the lighting circuit 15 can be adjusted, and an illumination effect with movement like a candle flickering can be performed on the exhibit.

  Since the lighting circuit 15 is surrounded by the insulating case 16 made of synthetic resin, heat from the outside is not transmitted through the cover member 13, and the temperature rise of the circuit component 15b can be further suppressed. . Furthermore, electrical insulation with the cover member 13 made of metal can be achieved.

  Further, since the metal cover member 13 and the base member 14 are connected by the connecting member 18 made of a synthetic resin, the two can be thermally insulated from each other and also electrically insulated.

  Furthermore, since the lighting circuit 15 is housed in a space shielded from the outside by the connecting member 18 and the base member 14, it is possible to prevent the possibility of a tracking phenomenon due to dust in the air.

  Since the lighting circuit 15 is housed in the recess 13c of the cover member 13, there is no need to secure the lighting circuit storage space in the axial direction of the cover member 13, and the axial length of the lamp is shortened. A miniaturized lighting device can be provided.

  Furthermore, since the light source body 12 and the cover member 13 are made of aluminum, the light source body 12 and the cover member 13 are lightweight and do not become heavy as a light bulb when configured as a light bulb type LED lamp.

Further, when a lighting fixture such as a spotlight is configured using the lighting device of the present embodiment, the outline of the lighting device 10 is configured by a cover member 13 made of aluminum, and the appearance is similar to a general incandescent bulb. Since it is formed, there is no need for a metal outer member surrounding the light bulb as in the prior art, and it is possible to provide a lighting fixture that is inexpensive and inexpensive and has a novel design.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the scope of the present invention.

The longitudinal cross-sectional view of the illuminating device which is embodiment of this invention. Similarly the front view of an illuminating device. The lighting circuit of a illuminating device and a brightness characteristic are similarly shown, (a) is a schematic circuit diagram, (b) is a characteristic curve diagram. Explanatory drawing which showed the lighting fixture which is embodiment of this invention, and showed schematically the lighting fixture as a spotlight installed in the ceiling surface. The longitudinal cross-sectional view which shows the modification of the illuminating device which is embodiment of this invention. Similarly, the longitudinal cross-sectional view which shows the other modification of an illuminating device. Similarly, the longitudinal cross-sectional view which shows the other modification of an illuminating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Illuminating device 11 Semiconductor light emitting element 12 Light source body 13 Cover member 14 Base member 15 Lighting circuit

Claims (4)

A semiconductor light emitting device;
A light source body configured to support the semiconductor light emitting element and to have thermal conductivity;
A cover member containing a lighting circuit that supports the light source body and lights the semiconductor light emitting element;
A base member supported by a cover member;
An illumination device comprising: The lighting device according to claim 1, wherein the light source body is made of a metal having a light-transmitting portion that transmits light. The lighting device according to claim 1, wherein the light source body is rotatably supported with respect to the cover member. A lighting fixture comprising the lighting device according to any one of claims 1 to 3.

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