As a new type of light source, LED has attracted widespread attention due to its energy saving, long life, and no pollution. In particular, the successful use of a large number of LED technologies in the Chinese Olympic Games has produced extraordinary results. Local governments have supported the LED industry and established a large number of LED demonstration units. At the same time, a large number of companies have also set foot in this field. Even the batteries have started to make cars. BYD has become famous. The company once again raised the slogan of the LED world.
In order to open up the civilian market, the LED industry nowadays designs LED lamps to be replaceable, that is, to directly replace existing lamps. However, during the development of the lamps and lanterns, in addition to direct replacement of incandescent lamps with compact lamps, there are few direct replacement models, such as T8, ceiling lamp is almost a patent for fluorescent lamps, and the chandelier is still the world of tungsten lamps. Should we take the path of replacement?
What are the disadvantages of the existing replacement lamps?
1. Heat dissipation
The poor heat resistance of LEDs is well known and will inevitably lead to problems with wick life. The design of the existing LED lamps is often difficult to meet the requirements of heat dissipation. In a field where the heat dissipation requirements are very harsh, passive cooling methods are used that are extremely poor, and most of them are air-cooled or even closed-type air-cooled. For example, some lamps need plastic sleeves between the driving plate and the aluminum fins to increase the reliability of the insulation. It is also necessary to irrigate the thermal silica to improve the cooling capacity. The T8's lamp is still closed, the wick can only rely on air convection heat transfer to the aluminum tube on the back of the lamp to heat. In general, the internal temperature of such lamps will be seventy to eighty degrees. And if the heat is taken into account, the weight is also a problem; taking into account the weight, it is difficult to guarantee the heat dissipation, which is a dilemma in the existing design, and there is no feasible standard.
2. Life
LED wick life decreases exponentially with increasing temperature; electrolytic capacitor temperature decreases by half for every tenth increase in temperature; MOS temperature rises, internal resistance increases, loss increases, temperature rises again (constant current mode), and eventually burns . Of course, the domestic manufacturers did not give the lifespan of the specific LED lamps. The advertised time only mentioned that the life of the LED wicks was 100,000 hours. However, the lifetime bottleneck of the LED was in the system driver board. The LED wicks were not damaged and the system driver had been hung up.
3. Weight
In spiral-type interface lamps, the weight of a fluorescent lamp is only a fraction of that of LED lamps'>LED lamps. Since there is no problem with the heat sink, the weight of the fluorescent lamp is negligible for the lamp holder, but the weight of the LED is for the lamp holder. Is a very serious test, especially the 7.8W spiral interface LED light, its weight is very dangerous, which is what business considerations?
4. Price
A typical LED driver board may have a lifetime of only 5 years (home) at a temperature of 70 degrees, far from reaching the "concept" of the LED wick for 10 years. Therefore, compared with fluorescent lamps of the same brightness, even if the fluorescent lamp has only one year of life, the 1W1 fluorescent lamp is much more cost-effective than the 1W10 LED. In particular, damage to the LED luminaire is often not a bad wick, but it requires replacement of the entire lamp. This is because one-tenth of the driver boards have to discard the remaining nine-tenths of the lamps (the wicks and heat sinks account for the vast majority of the cost of the entire lamp), if every manufacturer is not good at recycling. , customers will not like this kind of product.
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