WO2021068538A1

WO2021068538A1 - Three-color led lamp bead, and led street lamp using same

Info

Publication number: WO2021068538A1
Application number: PCT/CN2020/095276
Authority: WO
Inventors: 陈宏伟
Original assignee: 浙江阿理特照明有限公司
Priority date: 2019-10-10
Filing date: 2020-06-10
Publication date: 2021-04-15
Also published as: CN110690335A

Abstract

Disclosed are an LED lamp bead capable of displaying three colors, and an LED street lamp using same. The LED lamp bead comprises a support (1), wherein two conductive groups (2), namely, a first conductive group (21) and a second conductive group (22), are arranged in the support (1) in parallel at intervals, a first chip (51) and a second chip (52) are respectively mounted on the first conductive group (21) and the second conductive group (22) and are connected by means of gold wires, and a first fluorescent powder layer (71) and a second fluorescent powder layer (72) respectively cover the first chip (51) and the second chip (52); after the first conductive group (21) is electrified, the first fluorescent powder layer (71) cooperates with the first chip (51) to enable the lamp bead to emit cold white light; after the second conductive group (22) is electrified, the second fluorescent powder layer (72) cooperates with the second chip (52) to enable the lamp bead to emit yellow light; and when the first conductive group (21) and the second conductive group (22) are electrified at the same time, the lamp bead emits yellow white light. The three-color LED lamp bead is the same as a common lamp bead on the market in terms of size, the space in the lamp bead support is fully utilized, and two blue light chips are distributed in parallel and correspondingly coated with two kinds of fluorescent powder, such that the effect of emitting three color temperature light sources is achieved, and three aims are achieved by means of one lamp.

Description

Three-color LED lamp bead and LED street lamp using the lamp bead

Technical field

The invention belongs to the field of LED lighting, and relates to an LED lamp bead capable of displaying three colors and an LED street lamp using the lamp bead.

Background technique

LED (Light Emitting Diode) is a semiconductor light-emitting device made based on the principle of PN junction electroluminescence. It has the advantages of high electro-optical conversion efficiency, long service life, environmental protection and energy saving, and small size. It is known as the green lighting source of the 21st century. If it can be applied to the field of traditional lighting, it will get a very significant energy saving effect, which is of great significance in today's global energy shortage. LED street lights have the advantages of energy saving, environmental protection and high reliability, and have been more and more widely used.

With the development of social life, people are no longer satisfied with LED light sources with a single color temperature and single brightness. For example, in summer, street lamps are required to emit cold white light with high color temperature, which will make people feel cool and comfortable; while in winter, high color temperature light sources It will make people feel cold and uncomfortable. At this time, what is needed is warm light with low color temperature; another example, in the latest European road lighting standards, street lights are required to emit white light with a color temperature of 4000-6000K in the first half of the night, and in the second half of the night, for To reduce light pollution and promote plant photosynthesis, you need a warmer yellow light with a color temperature below 3000K. In this way, street lamps are required to have the function of emitting light sources of multiple color temperatures.

A Chinese patent discloses an LED street light that automatically changes colors according to ambient temperature. The application number is 201110201543.6. It includes LED lamp bead components, dimming controllers, temperature sensors, and intelligent controllers. Each LED lamp bead component is made of the same The LED lamp beads of different colors are composed in series or parallel, and the LED lamp bead components of different colors from cold to warm colors are integrated together to form a street light board. Each lamp bead can only emit one color of light. For example, when it is necessary to emit cold light, the lamp bead with warm color light is in an idle state when it is powered off, and vice versa. For this kind of street lamp, if the required light intensity is 50w, it needs to be equipped with a 50w cold light lamp bead group and a 50w warm light lamp bead group (taking cold light and warm light as an example). In this way, what actually needs to be assembled is The 100w lamp bead module can realize the color changing function while ensuring the light intensity. This makes the above-mentioned LED street lamp in the prior art have a relatively large volume and a high manufacturing cost, and the resource utilization rate is low because some lamp beads are often in an idle state. At the same time, for manufacturers and users, it is necessary to reserve two colors of lamp beads (cold light lamp beads, warm light lamp beads) for assembly or maintenance and replacement, resulting in great pressure on storage space and management.

Summary of the invention

Aiming at the disadvantages of LED street lamp lamps in the prior art, such as large volume, high manufacturing cost, low utilization rate of lamp beads, and high storage pressure, a LED lamp bead that can display three colors is provided, which improves the performance of the lamp beads. Resource utilization rate can relieve storage pressure, which can effectively reduce the volume of LED street lamps and reduce manufacturing costs. At the same time, the present invention also provides an LED street lamp using the lamp beads.

The present invention provides a three-color LED lamp bead, which includes a bracket. Two sets of conductive groups are arranged in parallel and spaced apart in the bracket. They are a first conductive group and a second conductive group. Blue chips are installed on the two conductive groups. Corresponding to the first chip and the second chip. The blue chip and the conductive group are electrically connected by soldered metal wires. The first chip and the second chip are respectively covered with a first phosphor layer and a second phosphor layer; the first conductive group After energization, the first phosphor layer cooperates with the first chip to make the lamp bead emit cool white light; after the second conductive group is energized, the second phosphor layer cooperates with the second chip to make the lamp bead emit yellow light; When the two conductive groups are energized at the same time, the lamp beads emit yellow and white light.

Further, the support has a square shape, and its upper end surface is provided with two powder injection grooves at intervals, namely a first powder injection groove and a second powder injection groove. The first chip and the second chip are respectively accommodated in the first powder injection groove and the second powder injection groove. In the second powder injection tank, the first phosphor is coated in the first powder injection tank to form a first phosphor layer, and the second phosphor is coated in the second powder injection tank to form a second phosphor layer.

Further, the first powder injection groove and the second powder injection groove are both nearly semicircular, and the single-sided light radiation angle is 165 degrees. The nearly semi-circular powder injection tank has symmetrical rules and is easy to process. At the same time, the light diverges more uniformly. Its radiation angle can reach 165 degrees, and the divergence range is wider. The luminaire has better light visibility and will not appear locally dim.

Furthermore, the first phosphor and the second phosphor are all mixed by green phosphor, red phosphor, A glue, B glue and diffusion powder in different proportions, wherein A glue is a fluorescent powder white light glue, and B glue is Hardener.

Preferably, the mass ratio of the green phosphor, the red phosphor, the A glue, the B glue and the diffusion powder of the first phosphor layer is 0.8:0.024:0.6:2.4:0.04.

Preferably, the mass ratio of the green phosphor, the red phosphor, A glue, B glue and the diffusion powder of the second phosphor layer is 0.111:1.89:0.6:2.4:0.04.

Further, the conductive group includes a positive-level conductive block and a negative-level conductive block that are arranged at intervals in the front and back.

Preferably, the volume of the negative-level conductive block is larger than the volume of the positive-level conductive block.

Preferably, the positive-level conductive block and the negative-level conductive block are both E-shaped, including the upper layer of the conductive block, the middle layer of the conductive block, and the lower layer of the conductive block. The blue light chip is fixed on the upper layer of the conductive block of the negative-level conductive block by bonding with die-bonding glue, The two ends of the blue chip are respectively welded to the upper conductive block of the positive conductive block and the upper conductive block of the negative conductive block through gold wires. The middle layer of the conductive block is the current buffer layer, and the lower layer of the conductive block is externally displayed on the support.

Preferably, the bracket is a plastic part, and the conductive group is a silver product.

The present invention also provides an LED street lamp, including a lamp, a driving unit, a circuit adjustment unit, and an LED light source assembly unit, wherein the LED light source assembly unit includes a circuit board and LED lamp beads, characterized in that the LED lamp beads are the above Three-color LED lamp beads, a plurality of three-color LED lamp beads are arranged in a matrix on the circuit board, wherein the first conductive group of each LED lamp bead is electrically connected in series to form a first circuit, and the second conductive group of each LED lamp bead The electrical connection in series forms a second circuit; the drive unit powers the circuit adjustment unit, which controls the current output of the drive unit, adjusts the drive current of the first circuit and the second circuit, changes the color rendering of the LED lamp beads, and then adjusts the LED street light Color temperature and brightness.

Compared with the prior art, the three-color LED lamp beads and corresponding LED street lamps provided by the present invention have the following advantages:

1. The three-color LED lamp beads of the present invention are the size of ordinary lamp beads on the market. They make full use of the space in the lamp bead holder. Two blue chips are distributed in parallel, and two phosphors are correspondingly coated, so that the beads can emit Two monochromatic lights and one mixed light achieve the effect of emitting three color temperature light sources, and realize one lamp for three purposes. In this way, each lamp bead can emit light when the street lamp is working, and can selectively emit cold white light and yellow light. , Yellow and white light, greatly improving the use efficiency of street lamp beads, there will be no one side of the light, the other side is idle, which can effectively reduce the volume of circuit boards and lamps and reduce production costs;

2. For manufacturers and users, it is only necessary to store the three-color LED lamp beads of the present invention for assembly, maintenance and replacement of street lamp beads, which can replace the original situation where two or three colors of lamp beads need to be stored , No need to store separately, which can effectively release the storage pressure of each unit;

3. The phosphor provided in the present invention has relatively stable physical and chemical properties under high temperature conditions, and solves the phenomenon of phosphor deterioration caused by light emission in the prior art. The first phosphor layer and the second phosphor layer are The short-distance arrangement will not affect the respective physical and chemical properties, which provides effective support for the reliable and continuous use of the lamp beads of the present invention.

In short, the three-color LED lamp beads of the present invention have a simple and compact structure, one lamp top and three functions, which greatly improves the resource utilization efficiency of street lamp lamp beads, effectively reduces the volume of circuit boards and lamps, reduces production costs, and at the same time Release the storage pressure, and the three-color LED lamp beads have a long service life, good reliability, and a wide range of applications, which are suitable for promotion.

Description of the drawings

FIG. 1 is a perspective schematic view of a three-color LED lamp bead from a top angle in Embodiment 1 of the present invention.

Fig. 2 is a perspective schematic view of a three-color LED lamp bead from the bottom angle in the second embodiment of the present invention.

Fig. 3 is a state diagram of the three-color LED lamp bead in the third embodiment of the present invention when no phosphor is coated.

Fig. 4 is a schematic diagram of the structure in Fig. 3 after the stent is removed.

Fig. 5 is a simple structural distribution diagram of three-color LED lamp beads in the first embodiment of the present invention.

Fig. 6 is a spectrum diagram of cold white light emitted by the light beads in the first embodiment of the present invention.

Fig. 7 is a spectrum diagram of yellow light emitted by the light beads in the second embodiment of the present invention.

Fig. 8 is a spectrum diagram of yellow and white light emitted by the light beads in Example 3 of the present invention.

Detailed ways

The following describes the implementation of the present invention in detail with reference to the accompanying drawings. The examples given are for illustrative purposes only and should not be understood as limiting the present invention. The accompanying drawings are for reference and illustrative purposes only, and do not constitute the scope of patent protection of the present invention. Limitation, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

Example one

In the prior art, as disclosed in a Chinese patent, an LED street light that automatically changes colors according to the ambient temperature, the application number is 201110201543.6, which includes an LED lamp bead assembly, a dimming controller, a temperature sensor, and an intelligent controller. Each LED The lamp bead assembly is composed of LED lamp beads of the same color in series or parallel, and multiple routes of cold to warm LED lamp bead assemblies with different tones are integrated to form a street light board. Each lamp bead can only emit one color of light. For example, when it is necessary to emit cold light, the lamp bead with warm color light is in an idle state when it is powered off, and vice versa. For this kind of street lamp, if the required light intensity is 50W, and the brightness of a single lamp bead is 1W, it needs to be equipped with at least 100 lamp beads, 50 of which are individually cold white, and 50 are individually yellow. When it emits yellow and white light, it may be necessary to prepare 50 separate yellow and white light beads, or light up 25 cold white light beads + 25 yellow light beads, so that there will be idle lamp beads, 100 lamp beads The module can realize the color changing function while ensuring the light intensity. This makes the above-mentioned LED street lamp in the prior art have a relatively large volume and a high manufacturing cost, and the resource utilization rate is low because some lamp beads are often in an idle state. At the same time, for manufacturers and users, it is necessary to reserve two colors of lamp beads (cold light lamp beads, warm light lamp beads) for assembly or maintenance replacement, resulting in great pressure on storage space and management.

As shown in Figures 1-5, this embodiment provides a three-color LED lamp bead, which includes a bracket 1. Two sets of conductive groups 2 are arranged in parallel in the bracket, which are the first conductive group 21 and the second conductive group. 22. The blue chip 5 is installed on the two groups of conductive groups 2, respectively corresponding to the first chip 51 and the second chip 52. The blue chip 5 and the conductive group 2 are electrically connected by a welded metal wire 6. The two chips 52 are respectively covered with a first phosphor layer 61 and a second phosphor layer 62.

In this embodiment, the bracket 1 has a square shape, and its size is the same as the size of the existing SMD chip LED lamp beads, and its upper end surface is provided with two powder injection grooves at intervals, namely the first powder injection groove 11 and the second powder injection groove. Slot 12, the first chip 51 and the second chip 52 are respectively accommodated in the first powder injection tank 11 and the second powder injection tank 12, and the first phosphor is coated in the first powder injection tank 11 to form the first phosphor Layer 71, the second phosphor is coated in the second powder injection tank 12 to form a second phosphor layer 72.

The three-color LED lamp beads in this embodiment are the size of ordinary lamp beads on the market. They make full use of the space in the lamp bead holder. Two blue chips are distributed in parallel, and two kinds of phosphors are coated correspondingly, so that the beads can emit two lights. One monochromatic light and one mixed light achieve the effect of emitting three color temperature light sources, and realize one lamp for three purposes. In this way, each lamp bead can emit light when the street lamp is working, and can selectively emit cold white light, yellow light, Yellow and white light, in this example, the first conductive group 21 is energized, and the first phosphor layer 71 cooperates with the first chip 51 to make the lamp bead emit cool white light.

The three-color LED lamp bead in this embodiment greatly improves the use efficiency of the street lamp lamp bead, and there is no state where one side emits light and the other side is idle. The light-emitting brightness of the three-color LED lamp bead in this embodiment is 1W For example (the actual brightness is not limited to this brightness), when the street light is 50W, it only needs to be equipped with 50 lamp beads, which is greatly reduced compared to the lamp module that requires at least 100 lamp beads in the prior art. The volume of the lamp bead module can effectively reduce the volume of circuit boards and lamps, and reduce production costs. At the same time, for manufacturers and users, it is only necessary to store the three-color LED lamp beads of the present invention to assemble the street lamp lamp beads. And repair and replacement, you can replace the original need to store two or three colors of lamp beads, no need to store separately,

Can effectively release the storage pressure of each unit.

In this embodiment, the first powder injection tank 11 and the second powder injection tank 12 are both nearly semicircular. The nearly semi-circular powder injection tank has symmetrical rules and is easy to process. At the same time, the light diverges more uniformly. Its radiation angle can reach 165 degrees, and the divergence range is wider. The luminaire has better light visibility and will not appear locally dim.

The conductive group 2 includes a positive-level conductive block 3 and a negative-level conductive block 4 arranged at intervals in the front and rear. The volume of the negative-level conductive block 4 is larger than the volume of the positive-level conductive block 3. In this way, it is convenient to identify the positive-level conductive block 3 and the negative-level conductive block 4, which provides identification for subsequent installation and assembly, and guarantees the qualified rate of the product. Both the positive-level conductive block 3 and the negative-level conductive block 4 are E-shaped, including an upper conductive block layer 23, a conductive block middle layer 24, and a conductive block lower layer 25. The blue chip 5 is fixed to the conductive block of the negative conductive block 4 through solid crystal glue. On the block upper layer 23, the two ends of the blue chip 5 are respectively welded to the conductive block upper layer 23 of the positive conductive block 3 and the conductive block upper layer 23 of the negative conductive block 4 through gold wires. The conductive block middle layer 24 is the current buffer layer. , The lower layer 25 of the conductive block is externally displayed on the bracket. The middle layer of the conductive block can effectively buffer the direct impact of the current on the blue chip, protect the electronic components, and prolong its service life. The lower layer of the conductive block is externally displayed on the bracket to facilitate electrical connection with the conductive sheet on the circuit board.

Among them, the bracket 1 is a plastic part, the conductive group 2 is a silver product, and the metal wire 6 is a gold wire. The bracket forms an insulating area, which effectively isolates the positive and negative conductive blocks, and realizes the independent operation of the first conductive group and the second conductive group.

The preparation process of the three-color LED lamp beads in this embodiment is:

1. Injection molding, the first conductive group, the second conductive group and their corresponding positive conductive blocks and negative conductive blocks are separated by injection molding in the mold to wrap the brackets and brackets outside the first conductive group and the second conductive group. There are a first powder injection groove and a second powder injection groove on the upper end surface;

2. Die-bonding, bonding the blue chip to the conductive group with die-bonding glue;

3. Wire bonding, welding the gold wire between the positive-level conductive block, the negative-level conductive block and the blue chip to form a current loop;

4. Dot powder; coating the first phosphor in the first powder injection tank to form a first phosphor layer, and coat the second phosphor in the second powder injection tank to form a second phosphor layer;

5. Long baking, baking the phosphor layer dry to form a finished LED lamp bead. The lamp beads that have been powdered need to be baked for more than 8 hours in an oven at 120° to 150° to fully harden the fluorescent glue (silicone) in the lamp cup, so that the silicone and the powder tank are fully bonded and bonded to reduce thermal expansion The cold shrinkage puts pressure on the chip and wire, and eliminates the internal stress of the colloid.

In this embodiment, the first phosphor and the second phosphor are all made of green phosphor, red phosphor, A glue, B glue and diffusion powder mixed in different proportions. Among them, A glue is fluorescent powder white light glue, B Glue is a curing agent.

The mass ratio of the green phosphor, red phosphor, glue A, glue B, and diffusion powder of the first phosphor layer 61 is 0.8:0.024:0.6:2.4:0.04.

The mass ratio of the green phosphor, red phosphor, glue A, glue B, and diffusion powder of the second phosphor layer 62 is 0.111:1.89:0.6:2.4:0.04.

As shown in FIG. 6, it is a spectrum of cool white light emitted by the three-color LED lamp bead in this embodiment, the peak wavelength is 450.5 nm, and the color temperature of the light source is 7092K.

The phosphor provided by the present invention has relatively stable physical and chemical properties under high temperature conditions, which solves the phenomenon of phosphor deterioration caused by light emission in the prior art. The close distance between the first phosphor layer and the second phosphor layer The arrangement also does not affect the respective physical and chemical properties, and provides effective support for the reliable and continuous use of the lamp beads of the present invention.

This embodiment also provides an LED street lamp, including a lamp body, a driving unit, a circuit adjustment unit, and an LED light source assembly unit, wherein the LED light source assembly unit includes a circuit board and LED lamp beads, characterized in that the LED lamp beads are For the above-mentioned three-color LED lamp beads, a plurality of three-color LED lamp beads are arranged in a matrix on the circuit board, and the first conductive group 21 of each LED lamp bead is electrically connected in series to form a first circuit. The second conductive group 21 is electrically connected in series to form a second circuit; the driving unit powers the circuit adjustment unit, which controls the current output of the driving unit, adjusts the driving current of the first circuit and the second circuit, and changes the color rendering of the LED lamp beads. Then adjust the color temperature and brightness of the LED street light.

In this embodiment, when the street lamp is working, the line mediation unit controls the input current to the first line. Taking the luminous brightness of the aforementioned three-color LED lamp bead as 1W as an example, the first line current is 350mA, and the voltage is 3V (the actual current and voltage value). It is not limited to this data, it can also be 180mA, 6V, and finally make the light-emitting brightness of the lamp bead 1W, the same below), the second line current is 0, and the street lamp emits cool white light.

Example two

Compared with the first embodiment, when the street lamp is working, the circuit adjustment unit controls the input current to the second circuit, that is, after the second conductive group 22 is energized, the second phosphor layer 72 cooperates with the second chip 52 to make the lamp The bead emits yellow light; taking the luminous brightness of the aforementioned three-color LED lamp bead as 1W as an example, the second line current is 350mA, the voltage is 3v, the first line current is 0, and the street lamp emits yellow light.

At the same time, as shown in FIG. 7, it is a spectrum diagram of the yellow light emitted by the three-color LED lamp bead in this embodiment, the peak wavelength is 581.7 nm, and the color temperature of the light source is 3097K.

Example three

Compared with the first embodiment, when the street lamp is working, the line mediation unit controls the input current to the first line and the second line at the same time, that is, after the first conductive group 21 and the second conductive group 22 are energized, The emitted cold white light and yellow light are mixed to form yellow-white light. Taking the luminous brightness of the aforementioned three-color LED lamp bead as 1W as an example, the current of the first line is 175mA and the voltage is 3v, and the current of the second line is 175mA and the voltage is 3v. It is equivalent to two 0.5w chips that emit light to achieve the effect of 1w, and the street lamp finally emits yellow and white light.

At the same time, as shown in FIG. 8, it is a spectrum diagram of the yellow and white light emitted by the three-color LED lamp beads in this embodiment, the peak wavelengths are 451.6 nm and 575.9 nm, and the color temperature of the light source is 4359K.

The control mode of the line mediation unit of the present invention can be a toggle switch mode, a remote control switch, or a timing switch, and the method is not limited.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, etc. made without departing from the spirit and principle of the present invention Simplified, all should be equivalent replacement methods, and they are all included in the protection scope of the present invention.

Claims

A three-color LED lamp bead, which is characterized in that it comprises a bracket (1), and two conductive groups (2) are arranged in parallel and spaced apart in the bracket, namely a first conductive group (21) and a second conductive group (22), Two sets of conductive groups (2) are equipped with blue chip (5), corresponding to the first chip (51), second chip (52), blue chip (5) and conductive group (2) through the welding metal wire (6) Electrical connection, the first chip (51) and the second chip (52) are respectively covered with a first phosphor layer (71) and a second phosphor layer (72); after the first conductive group (21) is energized , The first phosphor layer (71) cooperates with the first chip (51) to make the lamp bead emit cool white light; after the second conductive group (22) is energized, the second phosphor layer (72) cooperates with the second chip (52) The lamp beads emit yellow light; when the first conductive group (21) and the second conductive group (22) are energized at the same time, the lamp beads emit yellow-white light.
The three-color LED lamp bead according to claim 1, characterized in that the bracket (1) is square, and its upper end surface is provided with two powder injection grooves, which are the first powder injection groove (11) and the second powder injection groove. The powder tank (12), the first chip (51) and the second chip (52) are respectively accommodated in the first powder injection tank (11) and the second powder injection tank (12). The first phosphor is coated on the first powder injection tank (11) and the second powder injection tank (12). A first phosphor layer (71) is formed in a powder injection tank (11), and a second phosphor is coated in the second powder injection tank (12) to form a second phosphor layer (72).
The three-color LED lamp bead according to claim 2, wherein the first powder injection groove (11) and the second powder injection groove (12) are both nearly semicircular, and the single-sided light radiation angle is 165 degrees.
The three-color LED lamp bead according to claim 2, wherein the first phosphor and the second phosphor are all made of green phosphor, red phosphor, glue A, glue B and diffuser powder in different proportions. In which glue A is phosphor white light glue, glue B is curing agent.
The three-color LED lamp bead according to claim 4, wherein the mass ratio of the green phosphor, red phosphor, glue A, glue B and diffusion powder of the first phosphor layer (71) is 0.8:0.024: 0.6:2.4:0.04.
The three-color LED lamp bead according to claim 4, wherein the mass ratio of the green phosphor, red phosphor, glue A, glue B and diffusion powder of the second phosphor layer (72) is 0.111:1.89: 0.6:2.4:0.04.
The three-color LED lamp bead according to claim 1, characterized in that the conductive group (2) comprises a positive-level conductive block (3) and a negative-level conductive block (4) arranged at intervals in front and back.
The three-color LED lamp bead according to claim 7, characterized in that the volume of the negative-level conductive block (4) is larger than the volume of the positive-level conductive block (3).
The three-color LED lamp bead according to claim 8, wherein the positive conductive block (3) and the negative conductive block (4) are both E-shaped, including the upper layer (23) of the conductive block and the middle layer (24) of the conductive block. ), the lower layer of the conductive block (25), the blue chip (5) is fixed on the upper layer (23) of the conductive block of the negative conductive block (4) by die-bonding glue, and the two ends of the blue chip (5) are electrically connected with gold The wires are respectively welded to the upper conductive block (23) of the positive conductive block (3) and the upper conductive block (23) of the negative conductive block (4). The middle layer (24) of the conductive block is the current buffer layer, and the lower layer of the conductive block ( 25) Appears on the stent.
An LED street lamp, comprising a lamp, a driving unit, a circuit adjustment unit, and an LED light source assembly unit, wherein the LED light source assembly unit includes a circuit board and LED lamp beads, characterized in that the LED lamp beads are any of the above claims 1-8 In the three-color LED lamp beads described in 1, a plurality of three-color LED lamp beads are arranged in a matrix on a circuit board, and the first conductive group (21) of each LED lamp bead is electrically connected in series to form a first circuit, and each LED The second conductive group (21) of the lamp beads are electrically connected in series to form a second circuit; the driving unit powers the circuit adjustment unit, and the circuit adjustment unit controls the current output of the driving unit, adjusts the driving current of the first circuit and the second circuit, and changes the LED lamp The color rendering of the beads, and then adjust the color temperature and brightness of the LED street lamp.