303 results about "LED filament" patented technology

An LED filament lamp emits lamp light of a third correlated color temperature, CCT3. An LED filament light source emits LED filament light of a first correlated color temperature, CCT1, of a first light intensity, I1, and a first luminous flux, LF1. A transparent envelope at least partly encloses the LED filament light source. A further LED light source provides further LED light of a second correlated color temperature, CCT2, a second light intensity, I2, and a second luminous flux, LF2. The further LED light source provides the further LED light to the envelope. The envelope is a light emitting structure configured to emit the further LED light and to transmit the LED filament light. The lamp light thus comprises one or more of the LED filament light and the further LED light and CCT1≤2500K, 8000K≥CCT2≥3500K and 2≥LF1 / LF2≥0.5, wherein CCT1, CCT2 and LF1 / LF2 are chosen such that 3400K≥CCT3≥2600K.

The LED filament lamp (1) is configured to provide lamp light emitting from a plurality of LED filaments (2, 3, 12). LED filament lamp (1) comprises a phosphor-converted green LED filament (2) and a hybrid direct-emitting red-blue LED filament (3). LED filament lamp (1) comprises at least one first LED filament (2) and at least one second LED filament (3). The first LED filament (2) comprises a plurality of first blue LEDs (91) configured to, in operation, emit first LED light being blue light. When the light emits from the blue or UV LEDs (91), 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 (3) 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 (3) 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 (2, 3, 12) may be controllable, such that the LED filaments (2, 3, 12) together emits white light with a variable color temperature or emits colored light.

An LED light filament includes an LED section, first and second conductive electrodes, and a conductive portion. The LED section includes LED chips. The first conductive electrode and the second conductive electrode are disposed at two ends of the LED section. The conductive portion is electrically connected between the LED chips. An LED chip among the LED chips has an electrical connecting portion, an end portion of the conductive portion is connected to the electrical connecting portion, the conductive portion has a first bent portion and a second bent portion. The conductive portion extends from the electrical connecting portion along a first direction of the LED chip, toward a second direction of the LED chip through the first bent portion, and toward a third direction of the LED chip through the second bent portion, and the first to third directions are different directions. An LED light bulb is also provided.

A LED filament arrangement (100) comprises a plurality of LED filaments (120) arranged in sequence with increasing CCT such that a shift in CCT between neighboring LED filaments is not noticeable by humans, thereby providing a smooth, unobtrusive transition in CCT.

The invention relates to the technical field of intelligent lighting control, and provides an LED filament dimming method and system based on artificial intelligence, and the method comprises the steps: obtaining a nonlinear multi-segment function dimming model and a dimming type of each LED filament according to a light output characteristic curve; optimizing a dimming model step by step through an adaptive condition, and adding sub-models which do not meet the condition into a subset; and after collecting ambient light data, comparing the ambient light data with the to-be-dimmed model and the subset, screening a minimum model set, and generating a dimming result by combining the matching relationship with the dimming type. Wherein the dimming types comprise brightness enhancement / weakening, and the optimization process comprises the steps of splitting a sub-model by key points, and recording parameters such as light intensity and color temperature range; temporarily storing the sensor when the ambient light data is abnormal; and finally, judging a matching relationship through an interpolation method, outputting a normal / abnormal result and recording abnormal information. According to the invention, the dimming accuracy and response efficiency of the LED lamp filament can be improved, and the stability and reliability of a dimming system are ensured.

The invention relates to the technical field of LED lamp driver board welding, and discloses a welding device for processing and producing LED filament lamp driver boards, comprising a conveyor belt, wherein the outer surface of the conveyor belt is provided with an equipment main body, and the equipment main body further comprises: two feeding devices, which are arranged on the front end and rear end surfaces of the conveyor belt, and the feeding devices are used to deliver welding rods as needed when the conveyor belt conveys the lamp driver board and subsequent components are turned on for welding, so as to ensure that the equipment main body can normally weld the LED filament with the LED lamp driver board and ensure the normal operation of the device; a processing device, which is arranged on the top of the conveyor belt, and the processing device is used to cooperate with the conveyor belt to pre-treat the welding surface of the LED lamp driver board to avoid the presence of debris on its surface affecting the welding quality of the LED lamp driver board and the LED filament. The device has the advantages of improving the welding quality of the LED lamp driver board and the LED filament, improving its welding efficiency, and being convenient for users to use.

An LED filament light bulb includes a bulb base, a driving circuit module mounted to the bulb base and including two electrical contacts, a bulb member, a light-emitting unit, and a first heat dissipation gel. The light-emitting unit includes at least two light-emitting strip modules, each including first and second conductive tabs. The first conductive tab of one light-emitting strip module is electrically connected to the second conductive tab of another light-emitting strip module. The second conductive tab of the one light-emitting strip module and the first conductive tab of the another light-emitting strip module are electrically and respectively connected to the electrical contacts. The first heat dissipation gel is disposed between the bulb member and the bulb base, and covers at least a portion of the driving circuit module.

A LED filament (2,20) configured to provide LED filament light. The LED filament comprising an elongated carrier (7) extending in a lengthwise direction, said elongated carrier comprising a first major surface (7a). The LED filament further comprises a plurality of LEDs (8) arranged on said first major surface and configured to emit LED light, a first layer (9) free from a luminescent material encapsulating or covering said plurality of LEDs and at least partly encapsulating or covering said first major surface, said first elongated translucent layer having a width, W1, transverse to said lengthwise direction, and a second layer (10) comprising a luminescent material configured to partly convert said LED light, the second layer is arranged on an outer surface (9a) of said first layer, such that the second layer is contained within the width, W1, of the first layer.

The LED filament includes an LED chip unit, a light conversion layer and electrodes. The light conversion layer covers the LED chip unit and parts of the electrodes. An outer surface of the light conversion layer is disposed with a layer body. The layer body covers the light conversion layer and at least covers parts of the electrodes. The layer body is provided with a chromogenic or light conversion material.

The invention relates to the field of composite materials, and discloses a light-operated LED filament lamp driving system and a light-operated LED filament lamp, and the light-operated LED filament lamp driving system comprises the following modules: a spectrum sampling module which is used for collecting light intensity data of a plurality of wavelengths in ambient light; the luminous flux calculation module is connected with the spectrum sampling module and is used for calculating real-time environment luminous flux based on the light intensity data and a sensor response function; and the error optimization module is connected with the luminous flux calculation module and is used for calculating a luminous flux error by comparing the real-time environment luminous flux with the target luminous flux and optimizing a dynamic light control threshold according to the error. According to the technical scheme of combining multispectral integral calculation, dynamic threshold adjustment and constant-current driving with PWM dimming, high-precision light detection in a complex light environment, rapid adaptation to dynamic light changes, stable driving of a filament lamp and non-stroboscopic dimming are achieved, meanwhile, false triggering caused by short-time light fluctuation is effectively restrained, and the light-emitting efficiency of the filament lamp is improved. The reliability and the service life of the system are improved.

A lighting device including at least one light emitter to emit blue light, a green phosphor having an emission peak in a range of 500 nm to 550 nm, a yellow phosphor having an emission peak in a range of 550 nm to 600 nm, and a red phosphor having an emission peak in a range of 600 nm to 650 nm, in which the yellow phosphor and the red phosphor have different full widths at half maximum, and the full width at half maximum of the yellow phosphor is longer than that of the red phosphor, and, in an emission spectrum, an intensity of light emitted from the lighting device increases from 500 nm to 600 nm, and the intensity of light emitted from the lighting device at 700 nm is less than about 10% of the maximum intensity of light emitted from the lighting device.

The invention provides a light generating system (1000) comprising a LED filament (400), a first optical element (500), and a second optical element (600); wherein: (A) the first optical element (500) and the second optical element (600) are configured parallel; wherein the first optical element (500) and the second optical element (600) have a shortest mutual distance (d1); (B) the LED filament (400) comprises (i) an array of a plurality of solid state light sources (10) arranged on an elongated carrier (450), and (ii) an elongated encapsulant (410) at least partly enclosing the plurality of solid state light sources (10) and covering at least part of the elongated carrier (450); wherein the LED filament (400) is configured to generate filament light (401); wherein the LED filament (400) comprises a light emitting surface (420), wherein during operation of the LED filament (400) the filament light (401) escapes from the LED filament (400) via the light emitting surface (420); wherein the light emitting surface (420) is configured in between the first and second optical elements (500,600) and extending from the first optical element (500) to the second optical element (600); (C) each of the first optical element (500) and the second optical element (600) is configured to specularly reflect at least 25% of the filament light (401) received by the first and second optical element (500,600), respectively; and (D) the first optical element (500) is further configured to transmit 25-75% of the filament light (401) received by the first optical element (500).

The LED lamp filament comprises a substrate, the substrate is provided with a conductive circuit, a control chip, a light-emitting chip and an electric connection terminal, the light-emitting chip is arranged on the conductive circuit, and the electric connection terminal is electrically connected with the conductive circuit; one end of each electric connection terminal is fixed on the substrate, the other end of each electric connection terminal is exposed out of the substrate, the number of the electric connection terminals is four, and the four electric connection terminals are respectively arranged at two end parts of the substrate and are fixedly connected to the end parts of the substrate in a riveting manner. According to the utility model, the electric connection terminal and the substrate are connected by adopting a riveting process instead of a spot welding process requiring high-cost equipment investment and a soldering process with relatively high pollution, so that the electric connector has the characteristics of high production efficiency and stable and reliable electric connection; in the assembling and using process of a lamp adopting the lamp filament, the electric connection terminals of the lamp filament are not prone to being loosened due to stress, and the lamp filament has the advantages of being stable in product quality and long in service life.

A modular electrical connection system (100) for two / three-dimensional lighting is described, comprising a plurality of two-dimensional modules (10), each comprising two distinct poles (11, 12) connectable to an electrical power supply, a negative pole (11) and a positive pole (12) formed by a wire in electrically conductive material comprising non-insulated connection portions (14, 15, 16) to connect the two poles (11, 12) to each other via electrical contact elements (31, 32) connected to a light source (50) such as a LED filament (51) comprising an eletromagnetic connection system (52) comprising a first wire (53) in electrically conductive material fixed to a second wire (54) in ferritic material, inserted in a tube (55) in electrically conductive material.

The present invention relates to an LED filament lamp (7) for lighting, wherein at least one LED filament (7) is configured to emit polarized light. The LED filament lamp (7) comprises at least one LED filament (1) and an encapsulated volume (V) with an envelope (10) that includes a light-exit window, within which the LED filament (1) is disposed. The LED filament (1) or LED filaments (11, 12) comprise several LEDs (3) arranged in a filament holder (2). At least one polarizer (5) is arranged with respect to the LED filament (1). The polarizer (5) is configured to provide a polarization direction for the light. The polarizer (5) fully or partially encloses the LED filament (1), such that the light, or part thereof, emitted by the LED filament lamp (7) can be polarized or unpolarized.

A LED filament (1) configured to, in operation, emit LED filament light (8, 9), and comprising a light-transmissive elongated carrier (2) comprising a first major surface (4) and a second major surface (5), an array of a plurality of N LEDs (3) configured to in operation emit LED light (10) and being arranged on the first major surface (4) of the light-transmissive elongated carrier (2), an elongated encapsulant (6) comprising a luminescent material (12), being arranged to cover the plurality of LEDs (3) and at least a part of the first major surface (4), and being configured for at least party converting the LED light (10) into converted light (11), and a partially light-transmissive layer (7; 16) arranged on the light-transmissive elongated carrier (2), being configured to one or more of reflect and absorb at least a part (14) of one or more of the LED light (10) and the converted light (11), and being configured to provide a non-uniform transmission of light in a wavelength range of from 400 nm to 800 nm.

This invention relates to the field of filament tying technology and provides a filament tying machine for LED filament lamp production. The machine includes a base, a pair of movable seats, and a pair of placement seats. A rack is fixedly mounted on one side of the base. The pair of movable seats are slidably connected to multiple guide shafts and threadedly connected to a threaded rod. Placement frames and rotating shafts are fixedly mounted on both sides of the placement seats. One end of the rotating shaft is rotatably mounted on the movable seat, and a gear is fixedly mounted on the rotating shaft. A pair of gears mesh with the rack for transmission. The filament tying machine for LED filament lamp production also includes a movable filament tying mechanism and a movable clamping mechanism. The filament tying machine for LED filament lamp production provided by this invention can drive the two placement seats to move alternately in a cycle. With the cooperation of the movable filament tying mechanism and the movable clamping mechanism, it can achieve alternating filament tying processing and clamping of two lamp heads, realizing rapid processing of LED filament tying and effectively improving the processing efficiency of LED filament tying.

Provides high power LED filament bulbs with better heat dissipation. [Solution] The bulb includes a bulb housing 1, a filament 2, a base 3, and a driving component 4, the bulb housing 1 is connected to the base 3, the driving component 4 is attached to a cavity of the base 3 and includes an aluminum substrate 41, at least a portion of the edge of the aluminum substrate 4 contacts the inner wall of the base 3, the filament 2 is attached to the cavity of the bulb housing 1 and is electrically connected to the driving component 4, and a heat dissipation gel 5 covering the driving component 4 is provided within the base 3, the heat dissipation gel 5 contacts the inner wall of the base 3.

To provide a decorative LED bulb capable of being decorated without depending on LED light emission control, and a manufacturing method therefor.SOLUTION: A vacuum LED bulb comprises an LED filament, and a glass bulb that protects the LED filament, where a clay layer with light transmissivity and light diffusion is formed over the entire surface of the glass bulb, and a pattern layer is formed on top of the clay layer. With a decorative LED bulb, the pattern layer is formed on top of the clay layer, making it possible to enjoy looking at the decorative LED bulb for a long period of time.SELECTED DRAWING: Figure 1

The utility model relates to a light-emitting diode (LED) filament bulb lamp, which comprises a luminous body, a bulb shell and a lamp holder, the end part of the bulb shell is connected with the lamp holder, the luminous body electrically connected with the lamp holder is arranged in the bulb shell, a reflective film or paper is paved on a sealing opening of the closing end of the bulb shell in the lamp holder, and the inner side of the opening end of the lamp holder is connected with the periphery of the closing end of the bulb shell after being dried and cured by daub. Reflecting films or paper, such as aluminum films, micro-prism reflecting films, glass bead reflecting films, aluminum reflecting paper, silver-plated reflecting paper or highlight white reflecting paper, is laid on a sealing opening of the closing-up end of the lamp holder and the bulb shell, so that the reflecting effect of light and the uniformity of light spots are improved, and the lighting effect is improved through the reflecting paper or the films after the light-emitting body is lightened. The closed space formed in the bulb is filled with the high-thermal-conductivity gas, so that the heat dissipation performance of the LED filament bulb lamp is improved, the service life of the LED filament is prolonged, and the stability of the LED filament is improved; the LED filament bulb lamp has the advantages of being efficient, energy-saving and environment-friendly, and compared with a traditional lamp, a large amount of energy can be saved, and carbon emission can be reduced.

The utility model discloses an LED filament surface spraying device, which belongs to the technical field of LED filaments and comprises a spraying sleeve, an annular spraying frame is fixed on the inner wall of the spraying sleeve, a straightening mechanism is arranged in the spraying sleeve and comprises a support frame and a straightening sleeve, the support frame is fixed on the lower end face of the annular spraying frame, and the straightening sleeve is fixed on the lower end face of the annular spraying frame. The straightening sleeve is fixed between the supporting frames, and a clamping and feeding mechanism is arranged in the spraying sleeve. According to the lamp filament straightening device, due to the arrangement of the straightening mechanism, a lamp filament continuously passes through a straightening hole of a straightening sleeve and is straightened, so that convenience is provided for stable feeding of the follow-up lamp filament along the annular spraying frame, and convenience is brought to follow-up cutting use; the straightened lamp filament is completely naked and passes through the spraying range of the annular spraying frame, so that the comprehensive spraying effect is achieved, and the possibility that workers sputter spraying paint mist can be reduced in the mode that the lamp filament spraying is controlled by pulling the operating rod from the outer portion of the spraying sleeve.

The utility model relates to the technical field of LED lighting, in particular to a die for manufacturing an LED filament, which comprises a die frame, an inner die core is connected to the die frame in an embedded and clamped manner through a groove formed in the die frame, an outer die core is rotatably connected to the outside of the die frame through a mounting frame, and limiting grooves are formed in the surface of the die frame and the surface of the outer die core. A material storage box is arranged at the top of the mold frame, and a first drainage opening communicated with the material storage box is formed in the top wall of the interior of the mold frame. According to the improved mold for manufacturing the LED lamp filament, the inclined structure of the mold frame enables internal glue raw materials to flow along with the gravity under the action of gravity, the glue raw materials can be evenly attached to the surface of an LED support arranged between the inner mold core and the outer mold core in the flowing process, the effect of even coating is achieved, the complexity of back-and-forth turn-over coating is avoided, and the service life of the LED lamp filament is prolonged. The cavities at the bottoms of the inner mold core and the outer mold core enable redundant colloid to flow into the backflow box through the second drainage opening, the collected colloid raw materials can be reused in the follow-up process, and cost consumption is reduced.

An LED filament (100) includes: an array of a plurality of LEDs (110); a circuit (120) coupled to the plurality of LEDs; a carrier (130) arranged to support the plurality of LEDs; and an encapsulation (140) comprising a translucent material and a luminescent material configured to at least partially convert LED light into converted light, wherein the plurality of LEDs includes a first group of LEDs (150) arranged to emit first LED light in a first wavelength range of 430 nm to 490 nm, and a second group of LEDs (160) arranged to emit second LED light in a second wavelength range of 315 nm to 420 nm, wherein the circuit is configured to provide a first current I to the first group of LEDs during operation of the LED filament. c1 And provide a second current I to the second group of LEDs. c2 , where I c2 >I c1 .

The utility model discloses a non-polar LED filament structure which comprises a substrate, an LED chip is arranged on the substrate, a protection block is fixedly connected to the substrate, a heat dissipation groove is formed in the protection block, and the protection block is of a multi-layer composite structure and is sequentially provided with a light-transmitting layer, a high-temperature-resistant layer and a heat conduction layer from outside to inside. And the high-temperature-resistant layer covers the lower surface of the light-transmitting layer. Through the arrangement of the heat dissipation groove and the heat conduction layer, under the action of the heat conduction layer, the overall heat conduction effect of the protection block can be improved, and therefore heat generated when the LED chip works can be transmitted to the protection block and then dissipated to the external environment through the protection block, heat dissipation of the LED chip is achieved, and the service life of the LED chip is prolonged. The LED chips can work at a proper temperature all the time, so that the influence on the overall service life of the lamp filament is avoided, the contact area between the protection blocks and air can be increased under the action of the heat dissipation grooves, and the overall heat dissipation effect of the protection blocks can be improved.

The invention provides an LED light source filament arrangement (1) configured to emit LED filament light (2) in operation, the LED light source filament arrangement (1) comprising: a first plurality of LED light sources (3) configured to emit first LED light source light (4) in operation, the first LED light source light comprising blue LED light source light; a second plurality of LED light sources (5) configured to, in operation, emit second LED light source light (6), the second LED light source light comprising red LED light source light; and a light emitting layer (7) covering at least a portion of the first plurality of LED light sources (3) and at least a portion of the second plurality of LED light sources (5), the light emitting layer (7) being configured to convert at least 88% of the blue LED light source light (4) into converted light (8), the converted light (8) being one or more of green light and yellow light, and the second plurality of LED light sources (5) is arranged in a continuous configuration without any LED light source configured to emit, in operation, LED light source light of a color other than red provided in the continuous LED light sources of the second plurality of LED light sources (5).

There is provided a light emitting diode, LED, filament arrangement (100) configured to provide LED filament arrangement light (105) and comprising: a plurality of LED filaments (110) configured to emit corresponding LED filament light (115); an at least partially light transmissive housing 120, wherein the housing at least partially surrounds the plurality of LED filaments; a partition 130 disposed within the housing, where the partition and the housing define a plurality of partitions 140, where the partition includes a plurality of diffusely reflective surfaces 135 configured to reflect light by diffuse reflection, where at least one reflective surface of the plurality of diffusely reflective surfaces and at least one LED filament of the plurality of LED filaments are disposed in each partition.

A light emitting diode, LED, filament (1) configured to provide, in an on-state, LED filament light (2), and comprising an elongated carrier (3) comprising a longitudinal direction (LD), and a two-dimensional array of a plurality of LEDs (4) arranged on a first major surface (31) of the elongated carrier (3), and configured to, in operation, emit LED light (41). The two-dimensional array of a plurality of LEDs (4) comprises N rows of LEDs 5 and M columns of LEDs, where N ≥ 6 and M ≥ 50, and where the N rows of LEDs extend along the longitudinal direction (LD) of the elongated carrier. The two-dimensional array of a plurality of LEDs (4) has an outline having an outline width, W, and an outline length, L, W being in a range from 1 to 6 mm and L being at least 25 mm, and an aspect ratio is defined as L / W is at least 10. The plurality of LEDs comprises a plurality of X direct-emitting red LEDs 10 (4a), each comprising a red die (42a) having a first die surface area, SA1, a plurality of Y direct-emitting green LEDs (4b), each comprising a green die (42b) having a second die surface area, SA2, and a plurality of Z direct-emitting blue LEDs (4c), each comprising a blue die (42c) having a third die surface area, SA3. A coverage of the plurality of LEDs defined as the ratio of the total surface area of the red dies (42a), the green dies (42b) and the 15 blue dies (42c) to the surface area being enclosed by the outline of the two-dimensional array of a plurality of LEDs (4) is in a range from 10 to 40 %. The first die surface area, SA1, the second die surface area, SA2, and the third die surface area, SA3, each have a largest spatial extent, SE, that is less than or equal to 100 micrometers.

A lighting lamp assembly for a household appliance comprises a lamp holder, a lampshade covers the top of the lamp holder, the lampshade is made of transparent materials and is of a hollow shell-shaped structure, and a first electrode plate and a second electrode plate which penetrate through the upper end face and the lower end face of the lamp holder are further arranged in the lamp holder. The power line is connected with the first electrode plate and the second electrode plate on the lower portion of the lamp holder. The light-emitting module located in the lampshade is connected with the first electrode plate and the second electrode plate on the upper portion of the base. Wherein the light-emitting module comprises a full-wave rectifier bridge composed of four light-emitting PN junctions, and direct current output by the output end of the rectifier bridge is supplied to a plurality of main light-emitting PN junctions for use; one input end of the full-wave rectifier bridge is connected in series with a dropping resistor and then connected with the first electrode plate, and the other input end of the full-wave rectifier bridge is connected with the second electrode plate. The beneficial effects of the utility model are that by adopting the light-emitting module and combining the full-wave rectifier bridge and the LED filament technology, the efficiency of converting electric energy into light energy can be effectively improved.

The utility model discloses an LED filament lamp, which comprises a lamp shell, the lamp holder is connected to the lamp shell, the core column and the conductive support are arranged in the lamp shell, the flexible LED lamp filament is connected with the conductive support, and the drive circuit is arranged in the lamp holder and electrically connected with the conductive support. The flexible LED lamp filament comprises an LED section which comprises a plurality of LED chips and a light conversion layer wrapping the LED chips; the first conductive electrode is electrically connected with the plurality of LED chips and one of the two conductive brackets; the second conductive electrode is electrically connected with the plurality of LED chips and the other one of the two conductive brackets; the conductive parts are electrically connected among the plurality of LED chips; one LED chip in the plurality of LED chips is provided with an electric connecting part, one end part of the conductive part is connected to the electric connecting part, the conductive part is provided with a first bending part and a second bending part, the conductive part extends from the electric connecting part along a first direction, a second direction and a third direction of the LED chip, and the first direction, the second direction and the third direction are different directions.

The present invention relates to a LED filament lamp (1) comprising a LED filament arrangement (1') for emitting a white light output, and a control unit for controlling the white light output. The LED filament arrangement (1') comprises (i) a first LED filament component (4) having a first LED light source for emitting a first white light component of a first correlated color temperature and a first color point, the first color point having a first x color coordinate and a first y color coordinate, (ii) a second LED filament component (5) having a second LED light source for emitting a second white light component of a second correlated color temperature and a second color point, the second color point having a second x color coordinate and a second y color coordinate, and (iii) a third LED filament component (6) having a third LED light source for emitting a third white light component of a third color temperature and a third color point, the third color point having a third x color coordinate and a third y color coordinate. Each of the first correlated color temperature, the second correlated color temperature and the third correlated color temperature is different from the other two. The third correlated color temperature is at least 500 K lower than each of the first correlated color temperature and the second correlated color temperature. The first color point is located below the black body locus, the second color point is located on or above the black body locus, and the third color point is located on, or below, or above the black body locus, a color point located on the black body locus being within 10 SDCM from the black body locus, a color point located below or above the black body locus being at least 10 SDCM away from the black body locus. Each of the first x color coordinate, the second x color coordinate and the third x color coordinate is different from the other two by at least a value of 0,05, and / or each of the first y color coordinate, the second y color coordinate and the third y color coordinate is different from the other two by at least a value of 0,05.