The light source of human illumination has experienced three eras of incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps. As the fourth generation of new light source, LED has excellent characteristics such as high luminous efficiency, low power consumption, long service life, and high safety and reliability. In recent years, LED lighting has gradually become popular, but high-power LEDs still have these problems in the LED lighting industry.
1, LED color difference problem
There is basically no chromatic aberration problem in the application of a single LED, but if a large number of LEDs are put into use together or one lamp has multiple LEDs at the same time, the chromatic aberration problem is highlighted. Let me talk about a group of lamps. If we can see at a glance that the colors of the lights are inconsistent, even though LUXEON divides the LEDs into eight military regions according to the color temperature, then in each military region, the right community is divided into several communities, to a certain extent, a large range of color differences will be carried out. Control, but there are still differences in the same batch of LEDs in the same color zone, and this difference still cannot escape the provocation of the naked eye.
2, LED insulation problem
The insulation mentioned here refers to the heat-dissipating substrate. For the positive and negative electrodes of the LED, the fundamental problem has not been solved until now, but only the compensation measures are taken, such as using an aluminum substrate to process the insulation (the original aluminum substrate is not insulated, now Almost all done) Maybe everyone thinks it is incomprehensible. A single LED is not insulated, and the effect is small. There are problems when multiple series are connected.
3, LED anti-pulse problem
This problem is still controversial with the manufacturer. It does exist in practical applications. The main reaction is on the cold pulse, that is, at the moment of power-on, a few LEDs are broken or broken at the moment of cold power-on, not caused by static electricity or high voltage ( The boot voltage is in range).
4, the problem of LED illumination angle
Since the LED lens packages of different manufacturers are different, even if they are the same illumination angle (nominal angle), the effect is not the same, making the selection of the concentrator difficult and difficult to use.
5, LED potential blinding hidden dangers
The LED light-emitting point is too concentrated to make the center point super bright, which is easy to hurt people's eyes. Although some lighting manufacturers are making efforts in this regard, due to the lag of regulations, it can only be a moral issue for people.
6, LED fever problem
In theory, LEDs don't heat up very much, but due to the immature technology, LED heating is well known.
7, LED efficiency is low (luminosity)
At present, the electrical conversion efficiency of LEDs is too low (because there is no instrument testing, no specific information can be given at present).
8, LED brightness is insufficient
Insufficient brightness makes LEDs only play a supporting role in the lighting industry, mainly for decoration.
9, LED light decay and life
At present, the LED light decay and lifespan problems produced by mainland or Taiwanese companies are more serious. First, the big-name manufacturers such as LUXEON have a nominal 100,000 hours. I am afraid that they are only psychologically clear, and the heat dissipation is good or bad. Matching can affect the light decay and life of the LED, so 100,000 hours is just a selling point!
10, LED drive power problem
At present, most of the drive lines are borrowed from the switching power supply. Of course, there are also very small numbers of lines that are specifically used for LED driving, but the effect is basically the same. Since the LEDs need to be driven by DC, constant current control is adopted, which makes the driving lines quite large. Can not be compared with the electronic transformer, and the efficiency is relatively low, reaching 80% is not bad (single can not reach). In addition, in order to pursue applicability, the manufacturer claims that a driver can take ten or so casually (one, two... can be). In fact, this is a misunderstanding. Although it is a constant current, the starting voltage is too high. Let the LED die in an instant.
11, limited LED shape
Due to the characteristics of LED single-sided illumination, the shape of LED lamps is limited.
12, LED unit price is too high
An imported 1W-3WLED is about 3 US dollars, and more than 10 pieces are made in China (poor quality, no intellectual property rights). A 6-LED or so lamp is sold to consumers, almost 1000 yuan. Do you want to buy a color TV or buy a lamp?
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