Five bad phenomena in the LED flat light market
The LED panel light embodies the highest level of lighting application of "seeing the light but not the light". It has the advantages of uniform lighting, soft and comfortable, clean and bright, and has the advantages of anti-mosquito, smoke-proof, anti-fog and easy to clean; its simple shape is easy to integrate with the ceiling module, so it is especially complicated in the integrated ceiling, especially in the environment and the space is relatively complicated. There are great application advantages in the small bathroom and kitchen section. At the same time, LED panel lights have many characteristics such as low power consumption, energy saving and environmental protection, long life, economical use, technology fashion, convenient application, etc., which are deeply loved by modern consumers.
However, because there is no standard to follow for LED panel lights and the lack of core technology, some speculators flock to the industry. “No technology”, “no R&D”, “no quality control”, and “no bottom limit” appear in the industry for a while. A table, two screwdrivers, three or four people, a large number of shoddy workshop factories. In the market, there are a large number of LED panel lights with extremely short lifespan, poor light color and luminous efficiency, and even leakage accidents. This has led to continuous user complaints and dealers have no after-sales service. This has greatly affected the market’s confidence in LED panel lights. The healthy development of the industry.
Here, let us dissect the undesirable phenomena in the current market of LED panel lights from a technical point of view.
1. First, let’s analyze the LED light source devices currently used in LED flat lights
Because of its small size, suitable power, high luminous efficiency, easy light control and heat dissipation, the current LED flat light mainly uses SMD4014 lamp beads. We have done a comprehensive test on the LED lamp beads used in the multi-level "factories" in the industry, as shown in the picture on the right.
Inferior products in the industry mostly use inferior lamp beads with low price and low quality, and their chips are small (the size of 4014 lamp beads is 10*30, and the size of low-quality lamp beads is below 10*23), and the light output is low; at the same time, its package The colloids and phosphors are all low-cost configurations, and use copper wires with low melting point (quality lamp beads use gold wire), iron brackets (quality lamp beads use copper brackets or high thermal conductivity synthetic materials), so it is very easy to use in the process Burn out the dead lamp.
Second, let’s analyze the drive power that is also the core component
As LED lamp beads belong to low-voltage startup semiconductor devices, the most basic requirement is to use a matched low-voltage power supply to drive, and require a continuous constant current (too high current has fast light decay, and a longer time will cause the lamp to be extremely dim or even burned. light).
There are currently three main technical solutions for LED drive power:
1. Resistance-capacitance step-down: simple solution, few components, low cost, and non-constant current. It is mainly used for LED lamp configurations of 3W and below, and there is a risk of leakage caused by breakdown of the lamp board, so the structural shell of the lamp body must be insulated;
2. Non-isolated power supply: moderate cost, IC constant current, but there is also the risk of leakage through the lamp board, so the structural shell of the lamp body must be insulated.
3. Isolated power supply: higher cost, IC constant current, good safety.
In order to achieve better light output efficiency, the LED flat light string generally has a slender structure. Therefore, in order to ensure the heat dissipation requirements of the LED light, the all-aluminum structure is now used as the cavity and as the heat sink. The non-insulating nature of the aluminum lamp body requires the use of an isolated power supply to have basic safety protection, and at the same time, it can provide a continuous constant current to ensure the long-life use of the lamp beads.
At present, the bottom-line products in the industry are cutting corners. Some use resistance-capacitance step-down, and some use non-isolated constant current power supplies. In order to deceive the market, they also use inferior colloids, which are famous for being moisture-proof and waterproof. In fact, they are afraid of inferiority. The driving scheme is exposed.
At the same time, both are isolated constant current power supplies, and there are differences in the advantages and disadvantages of whether the plan is reasonable, whether the configuration is complete, whether the device is stable, whether the circuit is scientific, and whether the process is rigorous.
Here, just take the circuit board that everyone can understand. Inferior drivers use paper core boards, which are very easy to absorb moisture. During use, it is easy to short circuit and burn the lines; while high-quality drivers use fiberglass boards, which have circuit stability. , The advantages of moisture-proof and durable.
In terms of technology, standard manufacturers' high-quality drivers adopt automatic placement and automatic wave soldering, without confusion, and no false soldering, which cannot be satisfied by the workshop technology of inferior products.
Third, the overall matching and process anatomy of the LED panel light
From a technical perspective, LED panel lights are essentially electronic and electrical products. In addition to the selection of materials and devices, professional and rigorous R&D and design, experimental verification, product control, aging testing and other systematic measures are required to ensure product qualification and stability.
1. The first is the reasonable matching design of the lamp beads and the power supply. If the configuration is improper, either the current or voltage is too high, it is easy to burn the LED lamp beads; or the load exceeds the power supply, the temperature rises during use, the lamp beads flicker or even the power supply burns; the matching of the lamp beads and the power supply needs to be fully understood and Completed by a senior electronic engineer who knows LED and electronic technology.
2, then the heat dissipation structure design. The LED lamp beads will have a considerable amount of heat during use. If the heat can not be dissipated in time, the junction temperature of the LED lamp beads will be too high, which will accelerate the attenuation and aging of the LED lamp beads, or even die.
3. Again, structural coordination. As an electronic device, LED lamp bead is also a luminous body. It needs to carry out rigorous structural design in terms of device protection, light control and light guide, and is equipped with sophisticated production processes to ensure the realization of the design.
At present, in the industry, inferior parts are generally not professionally designed. Workshop manufacturers buy and use them at roadside shops like Chinese cabbage. Such structural parts can easily lead to LED packaging during assembly production and transportation. The colloid is squeezed and broken, and after a short period of use, blue light will escape from the broken lamp beads, and the LED flat light will appear blue and white, which is a quality problem.
At the same time, this kind of shoddy parts has poor process accuracy, large light leakage, large light absorption, and large light loss, which greatly reduces the overall light efficiency, and the illumination is far below the requirements when the product is used, which completely deviates from the energy-saving advantages of LEDs.
Another significant example of structural design, the current industry LED flat lights mostly use a DC plug. This kind of DC plug is originally used for signal transmission in the weak electronics industry such as earphones. It has poor over-current capability and is not suitable for the connection of wires of different specifications for LED flat lights, and the junction of the plug and the wire. It is connected by soldering, and inferior products in the industry are not fixed. Therefore, in the environment of assembly, packaging, transportation, installation, etc., it is easy to cause the welding of the plug to fall off, and a large proportion of the lines are blocked and cannot be lighted. And the market is not a serious problem that cannot be repaired.
Fourth, production process quality control status
LED panel light, as a kind of electronic and electrical products, requires strict and rigorous quality management methods and facilities to ensure the reliability of quality, including the pros and cons of performance, the stability of use, and the guarantee of life.
Usually, from R&D to production and shipment, you need to experience: photoelectric coordination design, structural design, optical design, industrial design, process design, etc., and then go through prototype trial production, conduct photoelectric parameter test, temperature rise test, and life test And various physical and chemical stability experiments, after verifying that they are correct, enter the development and trial production, and repeat the aforementioned development and testing experiments after the trial production to ensure reliability and stability before putting into mass production.
In mass production, performance and physical and chemical testing of various production materials including LED lamp beads, electronic components, lamp panels and various optical materials, structural materials, etc. are also required to ensure the qualification and consistency of the materials, and , In the production process, rigorous online inspection is also required to control the quality variation in the manufacturing process at any time.
Then, the current workshop companies in the industry have no design and quality control concepts and practical operations. After the assembly is completed in a patchwork and shoddy manner, it is lit up and dumped on the market, resulting in a large number of low-performance and low-quality "products." Flow to the market.
5. Overall industrial design and process requirements
At present, LED flat panel lights in the ceiling industry have the disadvantages of imprecise structure, sloppy craftsmanship, and rough production, such as exposed solder joints, random patchwork, etc., which have severely hit the "tall" image that LEDs should have in the minds of consumers. .
In summary, the integrated ceiling industry is the main field of LED flat light applications. We hereby call on industry practitioners to pay attention to and face up to the unfavorable status of LED applications in the industry, so that we can resist counterfeit and inferior products, show positive energy, and lead the industry. healthy growth.
