LED lighting device and design method thereof

Abstract

The present disclosure relates to the technical field of lighting, and more particularly to an LED lighting device and a design method thereof. The design method of the LED lighting device comprises: obtaining a set light efficiency; obtaining specification parameters of selected LED light sources; determining a preset number of the LED light sources in the LED lighting device according to the set light efficiency and the specification parameters of the LED light sources, the preset number of the LED light sources forming a target light source. The LED lighting device designed by the design method is conducive to reducing production cost.

Description

Technical Field

[0001] This disclosure relates to the field of lighting technology, and more specifically, to an LED lighting device and its design method. Background Technology

[0002] With the continuous development of lighting technology, traditional incandescent lamps are being increasingly replaced by LED lighting; the applications of LED lighting are also becoming more and more widespread. LED lighting, or light-emitting diode lighting, is a semiconductor solid-state light-emitting device, and lighting fixtures made using LEDs as the light source are called LED lamps. For some high-power LED lighting devices, their application scenarios include extremely large spaces such as factories, warehouses, underground parking garages, exhibition halls, and auditoriums. To achieve sufficient lighting effects in these spaces, a large number of LED light sources are typically used. However, such LED lighting devices often lack refined design, which can easily increase production costs.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this disclosure is to provide an LED lighting device and its design method, aiming to solve some technical problems discovered by the inventors, such as the lack of refined design, which easily leads to an increase in the production cost of LED lighting devices.

[0005] To achieve the above objectives, the technical solution adopted in this disclosure is: to provide a design method for an LED lighting device, comprising:

[0006] Get the set lighting effect;

[0007] Obtain the specifications of the selected LED light source;

[0008] Based on the set light effect and the specifications of the LED light source, a preset number of LED light sources in the LED lighting device is determined, and the preset number of LED light sources constitutes the target light source.

[0009] Optionally, the tolerance between the aspherical lens matched with the target light source and the target light source is obtained;

[0010] The tolerance of the relative position determines the change in the light distribution angle of any of the LED light sources.

[0011] Determine whether the change in the light distribution angle is within the tolerance range of the set light distribution angle of the LED light source.

[0012] Optionally, obtaining the set light effect includes:

[0013] The transmittance of the selected aspherical lens material, the driving conversion efficiency of the LED lighting device, and the overall lighting efficiency of the LED lighting device are obtained.

[0014] The set light effect is obtained based on the light transmittance, the driving conversion efficiency, and the overall light effect.

[0015] Optionally, the specifications of the LED light source include the voltage of the LED light source and the current of the LED light source when the set luminous efficacy is met.

[0016] Optionally, the LED lighting device design method further includes:

[0017] Design an aspherical lens that matches the LED light source, so that the LED light source has a set light distribution angle.

[0018] Optionally, the aspherical lens designed to match the target light source includes:

[0019] A virtual three-dimensional model of the aspherical lens is created, and optical simulation is performed on the virtual three-dimensional model to obtain the corresponding light distribution angle and light spot;

[0020] Determine that the light distribution angle meets a first preset condition and the light spot meets a second preset condition;

[0021] The aspherical lens is made into a physical form based on the virtual 3D model.

[0022] This disclosure also provides an LED lighting device designed using any of the design methods described above.

[0023] Furthermore, the LED lighting device includes:

[0024] A substrate on which multiple LED light sources are mounted;

[0025] A fixing plate is provided, on which multiple aspherical lenses are mounted, and each of the multiple aspherical lenses is arranged in a one-to-one correspondence with a multiple of the LED light sources;

[0026] A heat sink, wherein the fixing plate is fixedly connected to the heat sink, and the base plate is clamped between the fixing plate and the heat sink; and

[0027] A lamp umbrella, which is fixedly connected to the radiator.

[0028] Furthermore, the LED lighting device also includes a top cover, a mounting part, and a connecting frame. The connecting frame is fixedly connected to the heat sink, the top cover is fixed to the connecting frame through the mounting part, and the heat sink is located between the top cover and the lamp umbrella.

[0029] Furthermore, the heat sink has a first mounting surface and a second mounting surface, with a height difference between the first mounting surface and the second mounting surface; the fixing plate is in contact with the first mounting surface, and the second mounting surface is in contact with the substrate.

[0030] The main advantages of the LED lighting device and its design method disclosed herein are:

[0031] This disclosure allows for the setting of luminous efficacy to enable LED lighting devices to meet customer needs. Then, a suitable LED light source is selected as needed, and the specifications of the selected LED light source are obtained. Based on the set luminous efficacy and the specifications of the selected LED light source, the preset number of LED light sources required for the LED lighting device is determined, which is also the total number of LED lighting devices. This helps to optimize the LED lighting device and reduce costs. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of an LED lighting device according to one or more embodiments of the present disclosure;

[0034] Figure 2 This disclosure provides a structural schematic diagram of an LED lighting device from another perspective in one or more embodiments;

[0035] Figure 3 This disclosure provides a structural schematic diagram of an LED lighting device from another perspective in one or more embodiments;

[0036] Figure 4 Exploded views of LED lighting devices in one or more embodiments of this disclosure;

[0037] Figure 5 This is a schematic diagram of the structure of the lamp umbrella in one or more embodiments of this disclosure;

[0038] Figure 6 This is a schematic diagram of the assembly of the mounting part, connector and heat sink in one or more embodiments of this disclosure;

[0039] Figure 7 This is a cross-sectional view of the mounting part, connector and heat sink assembled in one or more embodiments of this disclosure;

[0040] Figure 8 yes Figure 7 A magnified view of a portion of point A in the middle;

[0041] Figure 9 This is a schematic diagram of the assembly structure of the fixing plate, base plate, sealing ring and heat sink in one or more embodiments of this disclosure;

[0042] Figure 10 This is a schematic diagram of the structure of a heat sink according to one or more embodiments of the present disclosure;

[0043] Figure 11 This is a structural schematic diagram of the heat sink from another perspective in one or more embodiments of the present disclosure;

[0044] Figure 12 This is a cross-sectional view of a heat sink according to one or more embodiments of this disclosure;

[0045] Figure 13 yes Figure 12 A magnified view of a portion of point B in the middle;

[0046] Figure 14 This is yet another structural schematic diagram of an LED lighting device according to one or more embodiments of the present disclosure;

[0047] Figure 15 This is a graph showing the relationship between the forward current and the relative luminous flux of an LED light source in one or more embodiments of this disclosure (showing the multiples corresponding to 400mA and 700mA);

[0048] Figure 16 This is a table of luminous flux corresponding to each brightness level when the current of the LED light source in one or more embodiments of this disclosure is 400mA.

[0049] Figure 17 This is a graph showing the relationship between the forward current and the relative luminous flux of an LED light source in one or more embodiments of this disclosure (showing the multiple corresponding to 535mA);

[0050] Figure 18 This is a flowchart illustrating the design method of an LED lighting device according to one or more embodiments of this disclosure;

[0051] Figure 19 This is a schematic diagram of the structure of an aspherical lens of an LED lighting device in one or more embodiments of this disclosure;

[0052] Figure 20A schematic diagram of the axial section of an aspherical lens in one embodiment of this disclosure, wherein the set light distribution angle of the LED light source is 40°;

[0053] Figure 21 A schematic diagram of the axial section of an aspherical lens in one embodiment of this disclosure, wherein the set light distribution angle of the LED light source is 70°;

[0054] Figure 22 A schematic diagram of the axial section of an aspherical lens in one embodiment of this disclosure, wherein the light distribution angle of the LED light source is set to 100°.

[0055] The details of the reference numerals used in the above figures are as follows:

[0056] 201. First curve; 202. Second curve; 203. First aspherical surface; 204. Second aspherical surface; 205. Base; 300. Top cover; 301. Mounting part; 302. Connecting frame; 303. Heat sink; 304. Base plate; 305. Fixing plate; 306. Aspherical lens; 307. Lamp umbrella; 308. Front end; 309. Rear end; 311. First mounting surface; 312. Second mounting surface; 313. Mounting plate; 314. Heat sink fins; 315. Sealing groove; 316. Sealing ring; 317. Base plate; 318. Top plate; 319. Drive power supply; 320. Connecting column. Detailed Implementation

[0057] To make the technical problems, technical solutions, and beneficial effects to be solved by this disclosure clearer, the disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit this disclosure.

[0058] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0059] It should be understood that the terms “length”, “width”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise expressly specified.

[0061] To illustrate the technical solutions described in this disclosure, the following detailed description is provided in conjunction with specific accompanying drawings and embodiments.

[0062] See Figure 18 As shown, in one or more embodiments, the LED lighting device design method provided in this disclosure is mainly used for designing high-power LED lighting devices, where the power of the high-power LED lighting device can be 230W or 300W. The LED lighting device design method includes:

[0063] Step S101: Obtain the set luminous efficacy; by setting the luminous efficacy, the required luminous efficacy of the selected LED light source is determined; this facilitates the determination of the desired luminous efficacy, helps reduce costs, and meets production requirements. In one embodiment, the LED light source is a surface-mount LED chip. Obtaining the set luminous efficacy includes: obtaining the transmittance of the selected aspherical lens material, the driving conversion efficiency of the LED lighting device, and the overall luminous efficacy of the LED lighting device; obtaining the set luminous efficacy based on the transmittance, driving conversion efficiency, and overall luminous efficacy; after determining the material of the selected aspherical lens, it can be obtained from the material's specifications; of course, for materials without specifications, it can also be measured using a transmittance tester. The driving conversion efficiency of the LED lighting device can be obtained from the technical parameters of the driving power supply after selecting the driving power supply for the LED lighting device. The overall luminous efficacy, also known as the luminous efficacy of an LED lighting device, is a preset value determined based on different customer or market demands. Different LED light sources have different color rendering indices (CRIs), thus affecting the preset value of the overall luminous efficacy. Specifically, the overall luminous efficacy varies depending on the CRI of the selected LED light source. In this embodiment, the LED light source selected can have a CRI of Ra ≥ 80 or a CRI of Ra ≥ 90. Generally, the higher the CRI, the lower the luminous flux. Since luminous efficacy equals luminous flux divided by power, it is known that the higher the CRI, the lower the luminous efficacy. Furthermore, LED light sources with a CRI of Ra ≥ 80 are generally used for general lighting, primarily for indoor lighting in homes, or for lighting in large spaces such as factories, warehouses, underground parking garages, exhibition halls, and auditoriums. LED light sources with a CRI of Ra ≥ 90 are generally used for testing lighting, primarily for locations requiring precise color contrast.

[0064] Step S102: Obtain the specifications of the selected LED light source. After determining the selected LED light source, the required parameters can be obtained from its technical specifications. This facilitates the design of the LED light source. In one embodiment, the specifications of the LED light source include the voltage of the LED light source and the current of the LED light source when the set luminous efficacy is met, i.e., the forward current. The voltage of the LED light source refers to the forward voltage, which can be obtained from the technical specifications of the selected LED light source. The current of the LED light source to meet the set luminous efficacy needs to be calculated, primarily through the relationship curve between the forward current and the relative luminous flux of the LED light source. The current of the LED light source to meet the set luminous efficacy is an upper limit value. This upper limit value is used to calculate the preset number of LED light sources in the LED lighting device, i.e., the minimum number of LED light sources required in the LED lighting device. This helps reduce the production cost of the LED lighting device. It should be noted that LED light sources (in this embodiment, surface-mount LED chips) are generally accompanied by technical specifications when they leave the factory. These specifications contain the technical parameters of the LED light source, as well as the relationship curve between the forward current and the relative luminous flux of the LED light source.

[0065] Step S103: Based on the set luminous efficacy and LED light source specifications, determine the preset number of LED light sources in the LED lighting device. This preset number of LED light sources constitutes the target light source. The number of LED light sources varies depending on the rated power of the LED lighting device; therefore, different calculations are required for different rated power levels. This ensures that the LED lighting device has the required number of LED light sources. The formula for calculating the number N of LED light sources in the LED lighting device is: N = P e ×η÷I÷U e , where P e U represents the rated power of the LED lighting device, η represents the driving efficiency of the LED lighting device, I represents the current of the LED light source, and U e This represents the voltage of the LED light source. The formula for calculating the number of LED light sources shows an inverse relationship between the number of LEDs and their current. To reduce the production cost of LED lighting devices, the number of LEDs needs to be optimal; that is, a minimum number of LEDs needs to be determined. This minimum number is the preset number of LEDs. Therefore, the preset number of LEDs, N, is... min The calculation formula is: N min =P e ×η÷I max ÷U e , where P eIndicates the rated power of the LED lighting device, η represents the driving efficiency of the LED lighting device, and I max The current of the LED light source that meets the set light effect, U e This indicates the voltage of the LED light source.

[0066] The LED lighting device design method provided in this disclosure sets the luminous efficacy to meet customer requirements, selects a suitable LED light source as needed, obtains the specifications of the selected LED light source, and determines the preset number of LED light sources required for the LED lighting device, i.e., the total number of LED lighting devices, based on the set luminous efficacy and the specifications of the selected LED light source. This helps to optimize the LED lighting device and reduce costs.

[0067] In some embodiments, the LED lighting device design method further includes:

[0068] Step S104: Obtain the tolerance of the relative position between the aspherical lens matching the target light source and the target light source. The target light source, i.e., a predetermined number of LED light sources, is mounted on a substrate, which is an aluminum substrate. Each LED light source corresponds to one aspherical lens, meaning the number of aspherical lenses is equal to the number of LED light sources, both being predetermined numbers. This facilitates optimization of the LED lighting device design and reduces the impact of tolerances. The relative position between the aspherical lens matching the target light source and the target light source is the relative position between the light-emitting surface of the LED light source and the light-receiving surface of its corresponding aspherical lens. Thus, the tolerance of the relative position between the aspherical lens matching the target light source and the target light source is the tolerance of the relative position between the light-emitting surface of the LED light source and the light-receiving surface of its corresponding aspherical lens. A predetermined number of aspherical lenses are mounted on a fixing plate. During assembly, the fixing plate is mounted on a first mounting surface, and the substrate is mounted on a second mounting surface. Because there is a height difference between the first and second mounting surfaces, and this height difference has a tolerance, and the first mounting surface has a machining tolerance, and the substrate has a thickness tolerance, these three factors affect the assembly relationship between the target light source and the aspherical lens that matches the target light source. The relative positional tolerance J1 between the aspherical lens matching the target light source and the target light source is the sum of the height difference tolerance J2, the machining tolerance J3, and the thickness tolerance J4, expressed by the formula J1 = J2 + J3 + J4. Since all the aspherical lenses are mounted on the fixing plate, and all the LED light sources are mounted on the substrate, the relative positional tolerance between each LED light source and its corresponding aspherical lens is set to be equal.

[0069] Step S105: Determine the change in light distribution angle of any LED light source caused by the relative position tolerance, where the relative position tolerance is the tolerance between the aspherical lens and the LED light source. This helps to optimize the design of LED lighting devices and reduce the impact of tolerances.

[0070] Step S106: Determine whether the change value of the light distribution angle is within the tolerance range of the set light distribution angle of the LED light source. If the change value of the light distribution angle is within the tolerance range of the set light distribution angle of the LED light source, it means that the tolerance of the height difference, the processing tolerance, and the thickness tolerance meet the design requirements of the LED lighting device. If the change value of the light distribution angle is not within the tolerance range of the set light distribution angle of the LED light source, it means that it does not meet the design requirements of the LED lighting device. It is necessary to redesign the first mounting surface and the substrate to improve the processing accuracy and thus meet the design requirements.

[0071] The LED lighting device provided in this disclosure determines the change in the light distribution angle of any LED light source caused by the relative position tolerance between the aspherical lens matched with the target light source and the target light source. Finally, it verifies whether the change in the light distribution angle is within the tolerance range of the set light distribution angle of the LED light source, thus verifying whether the relative position tolerance between the aspherical lens matched with the target light source and the target light source affects the set light distribution angle of the LED light source. The LED lighting device designed using this method helps reduce production costs and ensures that the designed LED lighting device meets minimum illuminance requirements, thereby satisfying customer needs.

[0072] In some embodiments, before step S104, the LED lighting device design method further includes an aspherical lens design step. When designing the aspherical lens, it is necessary to design an aspherical lens that matches the LED light source, so that the LED light source has a set light distribution angle. An aspherical lens refers to a lens whose curvature changes continuously on one of its optical surfaces, without a constant curvature. It can achieve excellent optical effects with a small lens volume, significantly reducing costs and improving the stability of the optical system. An aspherical lens has opposing inner and outer surfaces. The inner surface is the side where light enters, i.e., the inner surface is the light-inlet surface of the aspherical lens, and the outer surface is the side where light exits, i.e., the outer surface is the light-outlet surface of the aspherical lens. Both the inner and outer surfaces are smooth curved surfaces, and both are concave in the direction of light emission. Designing an aspherical lens that matches the target light source includes: creating a virtual three-dimensional model of the aspherical lens; performing optical simulation on the virtual three-dimensional model to obtain the corresponding light distribution angle and light spot; determining that the light distribution angle meets a first preset condition and the light spot meets a second preset condition; and manufacturing a physical aspherical lens based on the virtual three-dimensional model. The first expected condition is setting the light distribution angle, for example, to 40°, 70°, or 100°. The second expected condition is that no yellow light appears at the edge of the light spot. When the optical simulation shows that the corresponding light distribution angle does not meet the set light distribution angle, or when yellow light appears at the edge of the light spot, the model is readjusted until the simulated light distribution angle and light spot meet the first and second expected conditions, respectively. At this point, the required light distribution angle is the set light distribution angle for the LED light source, i.e., the optimal angle and optimal light spot are achieved. Once the light distribution angle meets the first preset condition and the light spot meets the second preset condition, a physical aspherical lens is fabricated based on the virtual 3D model of the aspherical lens. See also Figure 19 As shown, the fabricated aspherical lens includes a first aspherical surface 203, a second aspherical surface 204, and a base 205. The first aspherical surface 203 and the second aspherical surface 204 are respectively connected to the base 205, which is annular for ease of installation. The height of the aspherical lens is the distance between the highest point of the first aspherical surface 203 and the lower surface of the base 205. The first aspherical surface 203 is the outer surface, and the second aspherical surface 204 is the inner surface.

[0073] See Figure 20 , Figure 21 and Figure 22As shown, in one embodiment, the method for designing an aspherical lens includes: determining the diameter of the light-gathering surface of the aspherical lens based on the size of the LED light source, and drawing a first curve 201 with a preset curvature and a second curve 202 with a preset curvature. After rotation, a first aspherical surface 203 (outer surface) and a second aspherical surface 204 (inner surface) are obtained, and then synthesized to obtain a 3D model of the aspherical lens, which is a virtual three-dimensional model; performing optical simulation on the 3D model to obtain the light distribution angle and light spot; if the light distribution angle does not meet the requirements or yellow light appears at the edge of the light spot, the curvature of the first curve 201 and the second curve 202 needs to be modified and adjusted, and then a new 3D model is regenerated; the simulated light distribution angle and light spot meet the requirements, and the light distribution angle that meets the requirements is the set light distribution angle of the LED light source, that is, the optimal angle and optimal light spot are achieved. After obtaining the 3D model of the aspherical lens that meets the requirements, a physical aspherical lens can be made using the model. In one embodiment, the model of the aspherical lens is created using 3D modeling software, while optical software is used to simulate the model and obtain the light distribution angle and light spot. Specifically, the model of the aspherical lens is created using 3D modeling software. A first curve 201 with a preset curvature and a second curve 202 with a preset curvature are drawn in the 3D modeling software. By rotating the first curve 201, a first aspherical surface 203 (outer surface) is obtained, and by rotating the second curve 202, a second aspherical surface 204 (inner surface) is obtained. Then, a 3D model of the aspherical lens is synthesized. The 3D model is imported into the optical software, and the light distribution angle and light spot are obtained through simulation using the optical software. If the light distribution angle does not meet the requirements or yellow light appears at the edge of the light spot, the curvature of the first curve 201 and the second curve 202 need to be modified and adjusted. Then, a new 3D model is generated and imported into the Light Tools optical software until the light distribution angle and light spot obtained by the optical software simulation meet the requirements. At this point, the light distribution angle that meets the requirements is the set light distribution angle of the LED light source, that is, the optimal angle and optimal light spot are achieved. Once a 3D model of the aspherical lens that meets the requirements is created using software, the actual aspherical lens can then be fabricated using the model. Examples of 3D modeling software include Solidworks, 3D Studio Max, or Rhino; and optical software includes FRED, TracePro, and Lighttools. Utilizing both 3D modeling and optical software improves design efficiency and reduces design costs.

[0074] It should be noted that in step S106, when it is determined that the change value of the light distribution angle is not within the tolerance range of the set light distribution angle of the LED light source, the model of the aspherical lens is redesigned so that the current aspherical lens has a larger tolerance compared with the previous design.

[0075] For ease of understanding, the design method for LED lighting devices is described in detail below using a specific application scenario. The design method for LED lighting devices in this embodiment includes:

[0076] Step S201: Obtain the set luminous efficacy; Based on market demand, when the color rendering index Ra of the selected LED light source is ≥80, the overall luminous efficacy should be ≥130lm / W; The aspherical lens is made of PC material, and during testing, its transmittance is 90% or higher, and its driving conversion efficiency is 90% or higher. When both the driving conversion efficiency and transmittance are calculated using the lowest value of 90%, the set luminous efficacy that the selected LED light source needs to meet is:

[0077] 130lm / W÷90%÷90%=160.5lm / W,

[0078] That is, the luminous efficacy of the LED light source is ≥160.5lm / W.

[0079] It should be noted that when the color rendering index Ra of the selected LED light source is ≥90, the overall luminous efficacy is ≥120lm / W. Similarly, the above method can be used to calculate that when the color rendering index Ra of the selected LED light source is ≥90, the required luminous efficacy of the selected LED light source is as follows:

[0080] 120lm / W÷90%÷90%=148.1lm / W.

[0081] Step S202: Obtain the specifications of the selected LED light source; determine that the selected LED light source is Cree-JR5050-6V, and its technical requirements are as follows:

[0082] I. Electrical parameter requirements (Tj=25℃):

[0083] a) The typical forward voltage (at 700mA) is 6.1V, with a maximum value not exceeding 6.7V and a minimum value not lower than 5.6V;

[0084] b) Maximum operating current: 1000mA;

[0085] II. Optical parameter requirements (Tj-25℃):

[0086] a) Luminous flux: ≥600 1m (@700mA);

[0087] b) The nominal color temperature is 5700K, with a range of 5300K-6100K; (the color temperature range is based on the test data of the entire LED panel at Tj=85℃)

[0088] c) Beam angle: 115-120° (typical value, for reference)

[0089] d) Typical color rendering index: ≥80; (Color rendering index is based on LED panel surface mounting test)

[0090] e) R9 ≥ 0; (R9 value is based on LED whole board patch testing).

[0091] Based on the technical parameters of the selected LED light source, the luminous flux of the LED light source is ≥600lm when the forward current is 700mA. (See also...) Figure 15 As shown, based on the relationship curve between forward current and relative luminous flux (i.e., the relationship curve between forward current and luminous flux ratio), it can be calculated that the ratio corresponding to 700mA is 165%, and the ratio corresponding to 400mA is 100%. Therefore: 600lm ÷ 165% × 100% = 363.6lm, that is, when the forward current of the LED light source is 400mA, the luminous flux of the LED light source is ≥363.6lm.

[0092] Since the luminous flux of an LED light source at 400mA is ≥363.6lm, and referring to the luminous flux table for various brightness levels at 400mA, it can be seen that to achieve a luminous flux of ≥363.6lm at 400mA, the corresponding brightness level of the LED light source must be R2 or higher. Therefore, the minimum luminous flux of the selected LED light source should be 400lm. (See [reference needed]). Figure 16 As shown.

[0093] Based on the set luminous efficacy and the relationship curve between forward current and relative luminous flux, the upper limit of the current of the LED light source to meet the luminous efficacy requirement is determined. This upper limit is used to calculate the preset number of LED light sources in the LED lighting device. Specifically, a current value for one LED is selected, and the luminous flux of the LED light source corresponding to the selected current value is calculated based on the relationship curve between forward current and relative luminous flux. The luminous efficacy of the LED light source is then calculated using the calculated luminous flux. The calculated luminous efficacy value is compared with the set luminous efficacy value. If the calculated luminous efficacy value is greater than the set luminous efficacy value, the selected current value is increased, and the luminous efficacy of the LED light source corresponding to the newly selected current value is calculated. If the calculated luminous efficacy value is greater than the set luminous efficacy value, the selected current value is increased further; if the calculated luminous efficacy value is less than the set luminous efficacy value, the selected current value is appropriately decreased, and the calculation is repeated. For example, when the forward current of the LED light source is 400mA and the voltage is 6V, the luminous flux multiple is approximately 100%. At this time, the luminous flux of the LED light source is: 400lm * 100% = 400lm. The luminous efficacy of the LED light source at this time is: 400lm ÷ 0.4A ÷ 6V = 166.7lm / W. 166.7lm / W is greater than the set luminous efficacy value (≥160.5lm / W). Calculations show that when the selected appropriate current is a forward current of 535mA, the current of the LED light source can meet the requirements of the set luminous efficacy. For details, see [link to relevant documentation]. Figure 17 As shown, when the forward current of the LED light source is 535mA and the voltage is 6V, the luminous flux ratio is approximately 132%. At this time, the luminous flux of the LED light source is: 400lm * 132% = 528lm. The luminous efficacy of the LED light source at this time is: 528lm ÷ 0.535A ÷ 6V = 162.9lm / W. 162.9lm / W is greater than the set luminous efficacy value (≥160.5lm / W). Therefore, the luminous efficacy of the LED light source is ≥160.5lm / W, meeting the set luminous efficacy requirement. Therefore, the voltage of the selected LED light source is 6V, and the current of the LED light source that meets the set luminous efficacy requirement is 535mA.

[0094] It should be noted that when selecting the current of the LED light source that meets the set luminous efficacy, the current must be an integer. Therefore, in this embodiment of the present disclosure, 535mA is selected as the current value of the LED light source that meets the set luminous efficacy.

[0095] Step S203: Based on the set luminous efficacy and LED light source specifications, determine the preset number of LED light sources in the LED lighting device. The preset number of LED light sources constitutes the target light source. In this embodiment, two LED lighting devices with different power ratings are selected, including an LED lighting device with a rated power of 230W and an LED lighting device with a rated power of 300W. For different rated power ratings, the preset number of LED light sources in the LED lighting device is also different. The preset number of LED light sources in the 230W LED lighting device is: 230W * 90% ÷ 0.535A ÷ 6V ≈ 64 LEDs. 64 LED light sources are mounted on the substrate to form the target light source; see [link to previous section]. Figure 14 As shown, the preset number of LED light sources in an LED lighting device with a rated power of 300W is 300W*90%÷0.535A÷6V≈84. The 84 LED light sources are mounted on the substrate to form the target light source; 90% of which is the driving efficiency.

[0096] Step S204: Obtain the tolerance of the relative position between the aspherical lens matching the target light source and the target light source. In the LED lighting device, the tolerance of the height difference between the first mounting surface and the second mounting surface is ±0.3mm, the machining tolerance of the first mounting surface is ±0.1mm, and the thickness tolerance of the substrate is ±0.1mm. Therefore, the maximum positive value of the tolerance of the relative position between the aspherical lens and the target light source is 0.5mm. Before step S204, the design method of the aspherical lens matching the LED light source adopts the aforementioned aspherical lens design steps to ensure that the aspherical lens meets the set light distribution angle of the LED light source of 40°, 70°, or 100°, and the tolerance of these three set light distribution angles is ±7°.

[0097] See Figure 20 As shown, when designing an aspherical lens with a set beam distribution angle of 40° for the LED light source:

[0098] The curvature at the highest point A1 of the first curve 201 is a first set value. Starting from the highest point A1 of the first curve 201 towards point B1, which is two-thirds of the height of the first curve 201, the curvature of the first curve 201 gradually decreases from the first set value to a second set value. Starting from point B1, which is two-thirds of the height of the first curve 201, towards the lowest point C1 of the first curve 201, the curvature of the first curve 201 gradually increases from the second set value to a third set value, wherein the first set value is less than the third set value.

[0099] The curvature at the highest point A2 of the second curve 202 is the fourth setting value. Starting from the highest point A2 of the second curve 202 towards point B2 at three-quarters of the height of the second curve 202, the curvature value of the second curve 202 gradually increases from the fourth setting value to the fifth setting value. Starting from point B2 at three-quarters of the height of the second curve 202 towards the lowest point C2 of the second curve 202, the curvature of the second curve 202 gradually increases from the fifth setting value to the sixth setting value. Among them, the fifth setting value is greater than the third setting value, and the fourth setting value tends to 0.

[0100] See Figure 21 As shown, when designing an aspherical lens with a set beam distribution angle of 70° for the LED light source:

[0101] The curvature at the highest point A3 of the first curve 201 is the seventh set value. Starting from the highest point A3 of the first curve 201 towards the lowest point C3 of the first curve 201, the curvature of the first curve 201 gradually increases from the seventh set value to the eighth set value, where the seventh set value tends to 0.

[0102] The curvature at the highest point A4 of the second curve 202 is the ninth setting value. Starting from the highest point A4 of the second curve 202 towards point B4, which is two-thirds of the height of the second curve 202, the curvature value of the second curve 202 gradually increases from the ninth setting value to the tenth setting value. Starting from point B4, which is two-thirds of the height of the second curve 202, towards the lowest point C4 of the second curve 202, the curvature of the second curve 202 gradually increases from the tenth setting value to the eleventh setting value. Among these, the ninth setting value tends to 0.

[0103] See Figure 22 As shown, when designing an aspherical lens with a set beam distribution angle of 100° for the LED light source:

[0104] The curvature at the highest point A5 of the first curve 201 is the twelfth set value. Starting from the highest point A5 of the first curve 201 towards the lowest point C5 of the first curve 201, the curvature of the first curve 201 gradually increases from the twelfth set value to the thirteenth set value, where the twelfth set value tends to 0.

[0105] The curvature at the highest point A6 of the second curve 202 is the fourteenth setting value. Starting from the highest point A6 of the second curve 202 towards point B6, which is two-thirds of the height of the second curve 202, the curvature value of the second curve 202 gradually increases from the fourteenth setting value to the fifteenth setting value. Starting from point B6, which is two-thirds of the height of the second curve 202, towards the lowest point C6 of the second curve 202, the curvature of the second curve 202 gradually increases from the fifteenth setting value to the sixteenth setting value. Among these, the fourteenth setting value tends to 0.

[0106] It should be noted that since the lowest point of the first aspherical surface 203 is on the upper surface of the base 205 and the lowest point of the second aspherical surface 204 is on the lower surface of the base 205, the lowest point of the first curve 201 is on the upper surface of the base 205 and the lowest point of the second curve 202 is on the lower surface of the base 205.

[0107] Step S205: Determine the change in the light distribution angle of any LED light source caused by the relative position tolerance. Using optical software, simulate increasing the relative distance between the LED light source and the aspherical lens. For example, when the tolerance is increased by 0.5mm, the light distribution angle of the LED light source decreases from 47° to 40.9°, a change of 6.1°. It should be noted that during the simulation, the tolerance of the relative position between the aspherical lens and the target light source is added to the assembly distance between the assembly positions of the LED light source and the aspherical lens. Using optical software, a new light distribution angle is obtained, thus acquiring the change in the light distribution angle. The optical software can be Lighttools.

[0108] Step S206: Determine whether the change in the light distribution angle is within the tolerance range of the set light distribution angle of the LED light source. When the set light distribution angle is 40°, the tolerance is ±7°. Therefore, after increasing the relative position tolerance by 0.5mm, when the light distribution angle of the LED light source decreases from 47° to 40.9°, the change is still within the tolerance range of the set light distribution angle of 40°. Using optical software, when the relative position between the aspherical lens and the LED light source increases by 1.6mm, the light distribution angle of the LED light source will decrease from 47° to 33°. Therefore, the influence of the relative position tolerance on the light distribution angle will not exceed the tolerance range of 40°±7°. The optical software can be Lighttools.

[0109] It should be noted that when the relative position between the LED light source and the aspherical lens increases, the light distribution angle decreases; conversely, when the relative position between the LED light source and the aspherical lens decreases, the light distribution angle increases. Furthermore, calculations show that when the light distribution angle is less than or equal to 60°, it is easily affected by the tolerance of the relative position; when the light distribution angle is greater than 60°, the impact of the relative position tolerance is less significant. Therefore, in this embodiment, the tolerance caused by the relative position of the LED light source and the aspherical lens is mainly assessed when the light distribution angle is 40°. The tolerance caused by the relative position of the LED light source and the aspherical lens when the light distribution angle is 70° or 100° is not described in detail.

[0110] In some other embodiments, the LED lighting device design method also includes determining whether the illuminance of the LED lighting device meets the requirements at different beam angles when the installation height of the LED lighting device is the same. Generally, the smaller the beam angle, the higher the illuminance directly below the LED lighting device; while at the same beam angle, the higher the height, the lower the illuminance. When the illuminance of the LED lighting device meets the requirements, it indicates that the LED lighting device meets the design requirements; when it is determined that the illuminance of the LED lighting device does not meet the requirements, the number of LED light sources in the LED lighting device is increased until the requirements are met, or the current of the LED lighting device is increased to achieve the illuminance requirements. It should be noted that increasing the current of the LED lighting device may require sacrificing some luminous efficacy.

[0111] Examples: Illuminance requirements for an LED lighting fixture with a rated power of 230W installed at a height of 12 meters, and for an LED lighting fixture with a rated power of 300W installed at a height of 16 meters:

[0112] When the light distribution is narrow, that is, when the light distribution angle of the LED light source is set to 40°, the illuminance directly below the LED lighting device is ≥200 lux;

[0113] When the light distribution is in the medium range, that is, when the light distribution angle of the LED light source is set to 70°, the illuminance directly below the LED lighting device is ≥100 lux;

[0114] When the LED light source has a wide beam distribution, i.e., the beam distribution angle is set to 100°, the illuminance directly below the LED lighting device is ≥70 lux.

[0115] Specifically, the 3D model of the aspherical lens corresponding to the set light distribution angle and the LED light file are imported into the Lighttools optical software. After confirming the assembly position, ray tracing is started. After the tracing is completed, the light distribution curve is exported as an ies format file. Then, the ies format file is loaded using Dialux optical simulation software, the installation height is set, and the illuminance is calculated using Dialux optical simulation software.

[0116] In one embodiment, the LED lighting device with a rated power of 230W is installed at a height of 12m. When the beam angle is 40°, the illuminance directly below the LED lighting device is 353 lux, which is greater than 200 lux and meets the requirements. Calculations show that the LED lighting device with a rated power of 230W, when installed at a height of 16m with a beam angle of 40°, still meets the illuminance requirements.

[0117] An LED lighting device with a rated power of 230W installed at a height of 12m, with a beam angle of 70°, provides an illuminance of 145 lux directly below the device, which is greater than 100 lux and meets the requirements. Calculations show that an LED lighting device with a rated power of 230W, with a beam angle of 70°, still meets the illuminance requirements even when installed at a height of 14m.

[0118] The LED lighting device with a rated power of 230W is installed at a height of 12m. When the light distribution angle is 100°, the illuminance directly below the luminaire is 76 lux, which is greater than 70 lux and meets the requirements.

[0119] In another embodiment, the LED lighting device with a rated power of 300W is installed at a height of 16m. When the light distribution angle is 40°, the illuminance directly below the LED lighting device is 262 lux, which is greater than 200 lux and meets the requirements.

[0120] With a rated power of 300W and an installation height of 16m, the illuminance directly below the LED lighting device is 119 lux when the light distribution angle is 70°, which is greater than 100 lux and meets the requirements.

[0121] With a rated power of 300W and an installation height of 16m, the LED lighting device directly below the device has an illuminance of 71 lux when the light distribution angle is 100°, which is greater than 70 lux and meets the requirements.

[0122] In one or more embodiments, this disclosure also provides an LED lighting device designed using the design method of any of the embodiments. This LED lighting device features high luminous efficacy, good lighting effect, and relatively low production cost.

[0123] See Figures 1 to 4 As shown, in some embodiments, the LED lighting device includes: a substrate 304, a fixing plate 305, a heat sink 303, and a lamp umbrella 307; multiple LED light sources are mounted on the substrate 304; multiple aspherical lenses 306 are mounted on the fixing plate 305, with each aspherical lens 306 corresponding to one of the multiple LED light sources; the fixing plate 305 is fixedly connected to the heat sink 303, and the substrate 304 is sandwiched between the fixing plate 305 and the heat sink 303; the lamp umbrella 307 is fixedly connected to the heat sink 303. The substrate 304 is an aluminum substrate 304. All LED light sources on the aluminum substrate 304 are of the same specification. All aspherical lenses 306 on the fixing plate 305 are of the same specification. The number of aspherical lenses 306 is equal to the number of LED light sources. The multiple aspherical lenses 306 are mounted on the fixing plate 305 in a predetermined manner, and each aspherical lens 306 corresponds to one LED light source.

[0124] In some embodiments, the aspherical lens 306 is configured to set the beam distribution angle of the LED light source to 40°, 70°, or 100°. Specifically, all aspherical lenses 306 in the LED lighting device are of the same type, meaning that each LED light source in the LED lighting device has the same set beam distribution angle. This setting of the beam distribution angle helps meet market demands; furthermore, using aspherical lenses enables excellent optical performance with a smaller lens size, significantly reducing costs while improving the stability of the optical system.

[0125] See Figure 5 As shown, in some embodiments, the diameter of the cross-section of the lamp umbrella 307 gradually increases from one end to the other; the heat sink 303 is fixedly connected to one end of the lamp umbrella 307. In one embodiment, the lamp umbrella 307 is cylindrical, with a front end 308 and a rear end 309 opposite each other. The cross-section of the lamp umbrella 307 gradually increases from the rear end 309 to the front end 308, and the heat sink 303 is fixedly connected to the rear end 309 of the lamp umbrella 307 by fasteners (e.g., screws). This allows for improved lighting effects using the principle of reflection.

[0126] See Figure 6 As shown, in some embodiments, the LED lighting device further includes a top cover 300, a mounting part 301, and a connecting frame 302. The connecting frame 302 is fixedly connected to the heat sink 303. The top cover 300 is fixed to the connecting frame 302 via the mounting part 301. The heat sink 303 is located between the top cover 300 and the lamp umbrella 307. The maximum diameter of the top cover 300 is larger than the diameter of the rear end 309 of the heat sink 303, thus allowing the top cover 300 to cover the heat sink 303 and protect it from rain. The top cover 300 is generally conical. The mounting part 301 is used to install the LED lighting device. The mounting part 301 is detachably fixedly connected to the connecting frame 302; the connecting frame 302 installs the top cover 300. See also Figure 6 As shown, in one embodiment, the mounting part 301 is a hook, and the mounting part 301 is threadedly connected to the connecting frame 302. It should be noted that in some other embodiments, the mounting part 301 and the connecting frame 302 can also be detachably connected by a snap-fit ​​mechanism; the mounting part 301 can also be a rod-shaped structure to facilitate the installation of the LED lighting device. A heat sink facilitates heat dissipation, while the mounting part facilitates the installation of the LED lighting device.

[0127] In some embodiments, the lamp umbrella of the LED lighting device is configured to provide a 30° shading angle. Since the human eye's field of vision is limited under natural conditions, this ensures that the LED lighting device is not glaring when viewed from a distance of 10m at a 30° angle, thus preventing glare. The shading angle refers to the angle between the line connecting the outermost point of the light source and the edge of the light outlet of the luminaire, and the horizontal line passing through the center of the light source.

[0128] It should be noted that, according to simulations using Lighttools software, the effect of a lamp umbrella on an LED lighting device with a 40° beam angle is as follows: the beam angle decreases by 1.2°, resulting in a 3.83 lm / W reduction in luminous efficacy; for an LED lighting device with a 70° beam angle, the effect is: the beam angle decreases by 5.7°, resulting in a 7.27 lm / W reduction in luminous efficacy; and for an LED lighting device with a 100° beam angle, the effect is: the beam angle decreases by 16.5°, resulting in a 16.13 lm / W reduction in luminous efficacy. However, the overall impact on the illuminance of the LED lighting device is relatively small. Furthermore, when the light-shielding angle of an LED lighting device with a 100° beam angle is 30°, the number of LED light sources can be appropriately increased or the current increased to improve illuminance and reduce the impact of the lamp umbrella design on luminous efficacy.

[0129] See Figure 7 , Figure 8 , Figure 12 and Figure 13 As shown, in some embodiments, the heat sink 303 has a first mounting surface 311 and a second mounting surface 312, with a height difference between the first mounting surface 311 and the second mounting surface 312. In one embodiment, this height difference is 2mm ± 0.3mm. The fixing plate 305 is in contact with the first mounting surface 311, and the second mounting surface 312 is in contact with the substrate 304. See also Figure 9 , Figure 10 and Figure 11As shown, in one embodiment, the heat sink 303 includes a mounting plate 313 and a plurality of heat dissipation fins 314, which are fixed to one side of the mounting plate 313. A connecting bracket 302 is fixedly connected to the heat dissipation fins 314 by fasteners (e.g., screws). The aspherical lens 306 is located near the front end 308 of the lamp umbrella 307, while the LED light source is located away from the front end 308 of the lamp umbrella 307. A first mounting surface 311, a second mounting surface 312, and a sealing groove 315 are located on the opposite side of the mounting plate 313; the first mounting surface 311 is annular and circumferentially surrounds the second mounting surface 312, with the first mounting surface 311 near the front end 308 of the lamp umbrella 307 and the second mounting surface 312 away from the front end 308 of the lamp umbrella 307. The second mounting surface 312 has an annular sealing groove 315 in its circumferential direction, and a sealing ring 316 is installed in the sealing groove 315; the annular sealing groove 315 is located inside the annular first mounting surface 311. Holes are formed in the middle of the fixing plate 305, the middle of the base plate 304, and the middle of the mounting plate 313, and the hole in the middle of the mounting plate 313 is a threaded hole. Thus, after the fixing plate 305 and the base plate 304 are fixedly connected to the threaded hole on the mounting plate 313 by screws, the base plate 304 is fixed between the second mounting surface 312 and the fixing plate 305. Holes are also formed on the circumferential edge of the fixing plate 305, and threaded holes are also formed on the circumferential edge of the mounting plate 313. Thus, the circumferential edge of the fixing plate 305 and the circumferential edge of the mounting plate 313 are fixedly connected by screws. After the fixing plate 305 is fixedly connected to the mounting plate 313, the sealing ring 316 is compressed, which can protect the LED light source, such as making it waterproof and dustproof, so that the aspherical lens 306 and the LED light source are not blocked by dust, which is beneficial to improving the lighting effect.

[0130] See Figure 7 As shown, in some embodiments, the connecting frame 302 includes two base plates 317 and a top plate 318. The two base plates 317 are connected to opposite ends of the top plate 318, and the base plates 317 and top plate 318 are angled together, forming a recessed space between them. The LED lighting device also includes a driver power supply 319, which is located in the recessed space. One side of the mounting plate 313 also has multiple connecting posts 320, which are distributed at different positions on the mounting plate 313. The connecting posts 320 are used to fix the base plate 317 to the heat sink 303 and the driver power supply 319 to the heat sink 303. The fixing method is screws. The mounting part 301 is fixedly connected to the top plate 318 by a threaded connection. This optimizes the LED lighting device and helps to reduce the overall size of the LED lighting device.

[0131] In some embodiments, the LED lighting device has different specifications, such as a rated power of 230W and a rated power of 300W, to meet different market demands. It should be noted that when used for inspection lighting, the selected LED aluminum substrate 304 has surface-mount LEDs with a color rendering index (CRI) Ra≥90; when used for general lighting, the selected LED aluminum substrate 304 has surface-mount LEDs with a CRI Ra≥80. LED light sources with a CRI Ra≥80 are generally used for general lighting, that is, mainly for indoor lighting in homes, or for lighting in large spaces such as factories, warehouses, underground parking garages, exhibition halls, and auditoriums. LED light sources with a CRI Ra≥90 are generally used for inspection lighting, that is, mainly for places requiring precise color comparison, such as for product appearance inspection and color vibrancy testing. Because the LED lighting device in this embodiment has two power levels, three aspherical lenses, and uses two different LED chips with varying color rendering indices, it can be combined into 12 different configurations to meet requirements such as high brightness and high color rendering index or low cost and high color rendering index. Additionally, structures in the LED lighting device that may cause differences in the assembly position between the LED light source and the aspherical lens 306 include the sealing ring 316, the sealing groove 315, the first mounting surface 311, and the thickness tolerance of the aluminum substrate 304. In one embodiment, the selected sealing ring 316 has a cross-sectional area of ​​6.42832 mm². 2 The cross-sectional area of ​​the sealing groove 315 is 2.76mm * 2.4mm = 6.624mm. 2 The cross-sectional area of ​​the sealing ring 316 (i.e., 6.42832 mm²) 2 The cross-sectional area of ​​the sealing groove 315 is smaller than that of 6.624 mm². 2 In theory, after the sealing ring 316 is squeezed by the fixing plate 305, it will be completely submerged in the sealing groove 315 and will not overflow the sealing groove 315. Therefore, the positional tolerance of the sealing ring 316 and the sealing groove 315 to the aspherical lens 306 and the LED light source can be ignored.

[0132] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A design method for an LED lighting device, characterized in that, include: Get the set lighting effect; Obtain the specifications of the selected LED light source; Based on the set light effect and the specifications of the LED light source, a preset number of LED light sources in the LED lighting device is determined, and the preset number of LED light sources constitutes the target light source; Design an aspherical lens that matches the target light source, so that the LED light source has a set light distribution angle; The aspherical lens designed to match the target light source includes: The diameter of the light-gathering surface of the aspherical lens is determined based on the size of the LED light source. A first curve with a preset curvature and a second curve with a preset curvature are plotted. After rotation, the first aspherical surface and the second aspherical surface are obtained. Then, a virtual three-dimensional model of the aspherical lens is synthesized. Optical simulation is performed on the virtual three-dimensional model to obtain the light distribution angle and light spot. Determine that the light distribution angle meets a first preset condition and the light spot meets a second preset condition, wherein the first preset condition is to set the light distribution angle and the second preset condition is that no yellow light appears at the edge of the light spot; When the light distribution angle does not meet the requirements or yellow light appears at the edge of the light spot, the curvature of the first curve and the second curve are modified and adjusted, and then a new virtual three-dimensional model is regenerated until the simulated light distribution angle and light spot meet the first and second expected conditions respectively. The aspherical lens is made into a physical form based on the virtual 3D model.

2. The LED lighting device design method as described in claim 1, characterized in that, Also includes: Obtain the tolerance for the relative position between the aspherical lens that matches the target light source and the target light source; The tolerance of the relative position determines the change in the light distribution angle of any of the LED light sources. Determine whether the change in the light distribution angle is within the tolerance range of the set light distribution angle of the LED light source.

3. The LED lighting device design method as described in claim 1, characterized in that, The acquisition of the set light effect includes: The transmittance of the selected aspherical lens material, the driving conversion efficiency of the LED lighting device, and the overall lighting efficiency of the LED lighting device are obtained. The set light effect is obtained based on the light transmittance, the driving conversion efficiency, and the overall light effect.

4. The LED lighting device design method as described in claim 1, characterized in that, The specifications of the LED light source include the voltage of the LED light source and the current of the LED light source when the set luminous efficacy is met.

5. An LED lighting device, characterized in that, The LED lighting device is designed using the design method described in any one of claims 1-4.

6. The LED lighting device as described in claim 5, characterized in that, include: A substrate on which multiple LED light sources are mounted; A fixing plate is provided, on which multiple aspherical lenses are mounted, and each of the multiple aspherical lenses is arranged in a one-to-one correspondence with a multiple of the LED light sources; A radiator, wherein the fixing plate is fixedly connected to the radiator, and the base plate is clamped between the fixing plate and the radiator; as well as A lamp umbrella, which is fixedly connected to the radiator.

7. The LED lighting device as described in claim 6, characterized in that, It also includes a top cover, a mounting part, and a connecting frame. The connecting frame is fixedly connected to the heat sink, the top cover is fixed to the connecting frame through the mounting part, and the heat sink is located between the top cover and the lamp umbrella.

8. The LED lighting device as described in claim 6, characterized in that, The heat sink has a first mounting surface and a second mounting surface, with a height difference between the first mounting surface and the second mounting surface; the fixing plate is in contact with the first mounting surface, and the second mounting surface is in contact with the substrate.

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