LED as a new type of light source, energy saving, long life, clean by all the attention. In particular, China Olympics, successful use of a large number of LED technology, the effect is extraordinary, local govern ments have to support the LED industry, the establishment of a large number of LED demonstration unit at the same time, a large number of enterprises involved in the field, and even do the battery started the car fame BYD The company again raised the slogan LED first in the world.
LEDs are really into the boom?
Personally, I think this is just an unknown direction, spared from war period.
In human history, from which lighting equipment such as LED not yet mature to be high hopes, but the slow development of LED products also make too conceptual, the lack of customer base. Even now the government is trying to support the growth of the LED as a breakthrough LED street lamp, LED either civil or commercial customer base is still not formed. At this time there is a danger signal: LED manufacturers have been cutting costs as the top priority many companies, the LED current bigger to reduce the wick to maintain the brightness of the same number in order to save costs, or compression PCB area, or is to reduce the safety devices and other methods, of course, we have to believe that the inherent advantages of the company in China to reduce costs. Leaving aside the impact of product safety to do so, the industrial group, the LED in case there are no market to enter price shuffling situation, which is detrimental to the industry as a whole, funds the bulk of the entry will exacerbate the decline of the small and medium enterprises.
Depth analysis of: LED lamps are now also can not replace traditional lighting there are defects
This is a dangerous situation, on the one hand, the development of LED technology will be stagnation and even degradation of the other hand, the cost of compression, or that too much attention to costs can not guarantee that the final product characteristics, to a large extent can not display LED advantage. I venture to suggest that the development of LED industry in the wrong direction.
LED industry in order to open the civilian market, multi-LED lamps designed to be replaceable, and that is directly replace the existing lamps. But in the process of development in the lighting, in addition to the compact lamps directly replace incandescent, little direct replacement mode, like T8, Ceiling almost fluorescent patent, the chandelier is still dominated by incandescent light, LED why certain go to replace the road?
Replacement of lamps of this design approach there any drawbacks?
1. Heat
Poor heat of the LED is well known, will inevitably bring the wick life. The design of the existing LED lights tend to heat difficult to meet the requirements in the field of a heat dissipation is very demanding, but with very poor passive cooling, and is air-cooled, or even a closed air-cooled. As some lamps with plastic sleeve between the driver board and the aluminum heat sink to increase the reliability of insulation, irrigation cooling silicone to increase the cooling capacity. T8 lamp tube is closed, the wick can only rely on air convection heat transfer to the lamp on the back of the aluminum tubes for cooling. General, the internal temperature of these lamps will have seventy to eighty degrees. And if we take into account the heat, weight problems; take into account the weight, heat dissipation is difficult to guarantee, this dilemma of choice in the existing design, there is no feasible standard.
2 - Life
LED wick life was index decreased; electrolytic capacitor temperature is increased by ten degrees lower life expectancy in half; the MOS temperature, resistance increases, loss increases, the temperature will rise (constant current mode) with increasing temperature, and ultimately burned . Of course, the domestic manufacturers did not give a specific LED lamp life, and propaganda of the time just mentioned LED wick life of 100,000 hours LED life of bottlenecks in the system driver board LED wick is not damaged, the system drive has hung up.
Another LED light decay is very serious, so the life of the lamp should also consider the visual experience, after how long the brightness of the lamp to reduce the dark feel to the visual extent that life, and customers will consider the replacement of lamps, this life is that manufacturers do not have to come out (or there is no way to give), but it is very important.
Again, the majority of LED home lighting by size limits, protection is difficult to do well, in the voltage fluctuations, severe interference region, the existing low-power design is a test.
The most important thing is the life of the LED and the company\\ s life is proportional to two years if the publicity 10 years of LED lamps bad six months ago, the company has closed down, the user will take the risk?
3 Weight
The screw interface lamps, fluorescent light weight of only one of the LED lamps, due to the heat sink, the weight of the fluorescent lamp holder who can be negligible, but the weight of the LED lamp holder is a very serious test, particularly the 7.8W spiral interface LED lights, its weight is very dangerous, which is what businesses have to consider?
4 Price
LED driver board may be a life of only five years (home) temperature of 70 degrees, far from reaching 10 years of LED wick \"concept\". Compared to the same brightness of the fluorescent, even if the fluorescent only 1 year of life, 1W1 fluorescent is much much more cost-effective than the 1W10 $ LED. Damage to the LED lamps are often the wick is not bad, have the entire lamp replacement. Calculate the tenth driver board have to discard the remaining nine tenths of the lamp (wick and the heat sink accounted for most of the cost of the entire lamp), each vendor did not do a good job recycling, customers will not like this product.
5 Efficiency
Maybe some people will be very strange, LED energy-saving products, why should we consider the problem of efficiency? I mentioned here a PF value, a system efficiency. As the majority of the existing LED design are low power, cost pressure passive PFC (valley-fill), the PF may be up to 90, far less than the efficiency of active PFC easily 99 countries replaced with LED very close to the luminous efficiency of fluorescent lamps is a pressure.
The existing design of the LED lamps (In addition to the street light outside) the majority of low-power, accounted for a large proportion of such 4.8W, 7.2W, the loss of the device, which isolation mode is very low, in order to improve efficiency The use of a non-isolated not only to do good design in terms of security, efficiency is only about 80, far from ideal. Existing LED manufacturers, and in the end the illumination of the LED to do much, do not provide accurate values, often luminous intensity is much less than the nominal value.
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