The high-power LED breakthrough was after 2002. At that time, the LED core production company represented by lumine controlled the tight market situation, basically in the seller's market. In fact, the status of the LED seller market has been so far. Still not much change.
However, since 2005, Lumine's monopoly market has begun to slack off, especially in the past two years, high-power, high-efficiency LEDs have broken through Cree and Seoul Semiconductor, thus breaking the Lumine monopoly market.
Recent changes have become more apparent. Some companies have begun manufacturing high-power LEDs, including a single chip package of more than 100W. Edison Optoelectronics is the first to introduce a 20W package, which is the core of the high-power LED market.
In fact, the current package of more than 20W is realized by integrating 1W modules, so it is not the same as the previous products, and has become a square. The driving voltage is also improved by the series connection, especially the module exceeding 100W. The package size is close to 56mm × 56mm, and is equipped with strict heat dissipation measures, using metal heat sink materials and ceramic insulation materials.
Although the current LED is as hot as its calorific value, LED is still quite hot for small factories with immature technology. First of all, the heat dissipation problem of LEDs is not so easy to solve. At present, after high-temperature products are overheated, the light efficiency is greatly reduced, and the color temperature becomes high.
The other is light attenuation, especially the high-power product drive circuit can not fully guarantee the output of constant current, which poses new challenges for the design of the circuit. However, the conditions for responding to this challenge are not yet mature, and it also limits the direction of LEDs to the public.
Regarding the advantages of LEDs, there is no need to mention them again. Since the breakthrough of the new packaging mode, there are already 200W products available. Once there is demand, there will be more power products. What needs to be done is to increase the package size. . In doing so, it just makes up for the shortcomings of traditional light sources, because traditional light sources usually cannot realize surface light sources, and LEDs can just make up for such space to realize surface light sources.
This can be considered for use in cars. We have colleagues who have modified the brake lights, reading lights and side door lights. The effect is quite good. If you want to replace the car headlights with LEDs, can you?
The answer is self-evident, but there are many challenges. Although the current white LEDs have high luminous efficiency, because the spectrum is not uniform enough, the performance in each color segment is not uniform, giving the impression that the saturation is not high enough. The solution may only be to use the RGB module, which gives the manufacturer A new problem has been raised.
Audi cars have been at the forefront of technology, and recently reported that they will popularize LED headlights in the R8. In the car, although the LED is not afraid of vibration, but the heat dissipation problem has always followed, this will be the biggest challenge for the Audi R8. However, the reporter believes that this kind of green light source should be applied to the car earlier. Recently, we have also seen that the Airbus A330 has used LED as a reading light, which can ensure the stability in the bumps and the heat generation. Less than the traditional incandescent lamp, and without breaking, the benefits of LED are fully utilized.
Of course, at present, high-power LEDs are not used enough, and we expect to enter the family early. Once the home decoration is the preferred LED, I am afraid that is the right way for LED, LED era will replace the annual 4 billion fluorescent lamps.
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