Nowadays, many people think that LED products will completely replace traditional lamps. Indeed, in order to open the civilian market, the LED industry now designs LED lamps to be replaceable, that is, directly replace existing lamps. However, in the process of the development of lamps, in addition to the direct replacement of incandescent lamps with compact lamps, there are few direct replacement modes. For example, T8 and ceiling lamps are almost patents for fluorescent lamps, while chandeliers are still the world of tungsten lamps, 5 years. It is impossible for the internal LED lights to become mainstream. The first LED network is based on the current LED lighting fixtures on the market to replace the traditional lighting, what are the disadvantages:
1. In the weight of the screw type interface, the weight of the fluorescent lamp is only a fraction of that of the LED lamp. 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. A very serious test, especially the 7.8W screw interface LED lights.
Generally, the LEDs of the LEDs have obvious graininess, and their luminous positions are relatively concentrated. When the lamps are visually observed, there is a tingling sensation. This feeling is generally only found in other light sources. Therefore, the LED needs to be better designed on the uniform light to realize the expansion of the point source into a surface light source while ensuring the brightness, thereby improving the comfort of the eye. Then there are many products that will do LED dimming design to save energy, not to mention the efficiency problem at low power. Due to the current in the coil, the gray scale change in the dimming design will be discontinuous. In the process of proportional adjustment, the brightness of the LED will gradually brighten and then suddenly become bright, the visual sense is very uncomfortable, and the dimming technology still needs to be developed.
2. Lifetime LED life bottleneck in the system driver board, often the LED wick is not damaged, the system driver has been broken. In addition, the light decay of LED is very serious. Most of the existing LED household lighting is limited by volume, and it is difficult to do very well in terms of protection, in areas with large voltage fluctuations and serious interference.
3. Efficiency Why should we consider the issue of efficiency? One is the PF value and the other is the system efficiency. Since most of the existing LED designs are low-power, the passive PFC (filled valley) is used for the cost pressure. The PF may be up to 90, which is much smaller than the efficiency of the active PFC, and the LED is replaced by LED for the country. Fluorescent lamps that are very close in efficiency are a stress. Since the existing designs of LED lamps (except street lamps) are mostly low-power, such as 4.8W, 7.2W, etc., the loss of the device accounts for a large proportion, and the isolation mode is inevitably low, in order to improve efficiency. The non-isolated method not only has to be well designed in terms of safety, but also has an efficiency of only about 80, which is not ideal. Moreover, the existing LED manufacturers in the end do not provide accurate values ​​of the LED illuminance, often the brightness is much smaller than the nominal value.
4. Light perception One advantage of LED is that the spectrum is pure, but this is a very serious disadvantage in terms of vision.
The human eye can't observe a single-chromat light source for a long time. The LED can be dimmable, but it is more troublesome, more professional, and needs theoretical and a large amount of research data support. It is a lot of homogenizing material manufacturers or LED light source manufacturers or solution providers. Hard to achieve.
5. Heat Dissipation The poor heat resistance of LEDs can cause problems with the life of the wick. The design of existing LED lamps is often difficult to achieve heat dissipation. In a field where heat dissipation is very demanding, it uses very inferior passive heat dissipation methods, and most of them are air-cooled or even closed air-cooled. Like some luminaires, a plastic sleeve is added between the drive plate and the aluminum heat sink to increase the reliability of the insulation. It is also necessary to heat the silicone to improve the heat dissipation capability. The T8 lamp tube is still closed, and the wick can only rely on air convection heat transfer to the aluminum tube on the back of the lamp for heat dissipation. Generally, the internal temperature of such lamps will be seventy to eighty degrees. And if you take into account heat dissipation, weight is a problem; taking into account the weight, heat is difficult to guarantee, which is a dilemma in the existing design, there is no feasible standard.
6. In terms of price, the LED driver board may have a life span of only 5 years at 70 degrees (home), far less than the "concept" of the LED wick for 10 years. Therefore, even for fluorescent lamps of the same brightness, even fluorescent lamps are only 1 year old. Lifespan, 1W1 yuan fluorescent lamp is far more cost-effective than 1W10 yuan LED. Especially when the LED lamp is damaged, the wick is not broken, but the whole lamp is replaced. One count is because one tenth of the drive board has to discard the remaining nine tenths of the lamp (the wick and the heat sink account for most of the cost of the entire lamp), if every manufacturer does not recycle it. Customers will not like such products.
In summary, only when the development of technology makes LED lighting fixtures have advantages over traditional light sources in terms of efficiency, lighting quality, and design novelty, LED lighting can enter and continuously open up the market. On the other hand, the expansion of the market will lead to an increase in production and an increase in industry R&D investment, accelerating technological progress, resulting in improved performance and a gradual decline in cost and price.
1. In the weight of the screw type interface, the weight of the fluorescent lamp is only a fraction of that of the LED lamp. 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. A very serious test, especially the 7.8W screw interface LED lights.
Generally, the LEDs of the LEDs have obvious graininess, and their luminous positions are relatively concentrated. When the lamps are visually observed, there is a tingling sensation. This feeling is generally only found in other light sources. Therefore, the LED needs to be better designed on the uniform light to realize the expansion of the point source into a surface light source while ensuring the brightness, thereby improving the comfort of the eye. Then there are many products that will do LED dimming design to save energy, not to mention the efficiency problem at low power. Due to the current in the coil, the gray scale change in the dimming design will be discontinuous. In the process of proportional adjustment, the brightness of the LED will gradually brighten and then suddenly become bright, the visual sense is very uncomfortable, and the dimming technology still needs to be developed.
2. Lifetime LED life bottleneck in the system driver board, often the LED wick is not damaged, the system driver has been broken. In addition, the light decay of LED is very serious. Most of the existing LED household lighting is limited by volume, and it is difficult to do very well in terms of protection, in areas with large voltage fluctuations and serious interference.
3. Efficiency Why should we consider the issue of efficiency? One is the PF value and the other is the system efficiency. Since most of the existing LED designs are low-power, the passive PFC (filled valley) is used for the cost pressure. The PF may be up to 90, which is much smaller than the efficiency of the active PFC, and the LED is replaced by LED for the country. Fluorescent lamps that are very close in efficiency are a stress. Since the existing designs of LED lamps (except street lamps) are mostly low-power, such as 4.8W, 7.2W, etc., the loss of the device accounts for a large proportion, and the isolation mode is inevitably low, in order to improve efficiency. The non-isolated method not only has to be well designed in terms of safety, but also has an efficiency of only about 80, which is not ideal. Moreover, the existing LED manufacturers in the end do not provide accurate values ​​of the LED illuminance, often the brightness is much smaller than the nominal value.
4. Light perception One advantage of LED is that the spectrum is pure, but this is a very serious disadvantage in terms of vision.
The human eye can't observe a single-chromat light source for a long time. The LED can be dimmable, but it is more troublesome, more professional, and needs theoretical and a large amount of research data support. It is a lot of homogenizing material manufacturers or LED light source manufacturers or solution providers. Hard to achieve.
5. Heat Dissipation The poor heat resistance of LEDs can cause problems with the life of the wick. The design of existing LED lamps is often difficult to achieve heat dissipation. In a field where heat dissipation is very demanding, it uses very inferior passive heat dissipation methods, and most of them are air-cooled or even closed air-cooled. Like some luminaires, a plastic sleeve is added between the drive plate and the aluminum heat sink to increase the reliability of the insulation. It is also necessary to heat the silicone to improve the heat dissipation capability. The T8 lamp tube is still closed, and the wick can only rely on air convection heat transfer to the aluminum tube on the back of the lamp for heat dissipation. Generally, the internal temperature of such lamps will be seventy to eighty degrees. And if you take into account heat dissipation, weight is a problem; taking into account the weight, heat is difficult to guarantee, which is a dilemma in the existing design, there is no feasible standard.
6. In terms of price, the LED driver board may have a life span of only 5 years at 70 degrees (home), far less than the "concept" of the LED wick for 10 years. Therefore, even for fluorescent lamps of the same brightness, even fluorescent lamps are only 1 year old. Lifespan, 1W1 yuan fluorescent lamp is far more cost-effective than 1W10 yuan LED. Especially when the LED lamp is damaged, the wick is not broken, but the whole lamp is replaced. One count is because one tenth of the drive board has to discard the remaining nine tenths of the lamp (the wick and the heat sink account for most of the cost of the entire lamp), if every manufacturer does not recycle it. Customers will not like such products.
In summary, only when the development of technology makes LED lighting fixtures have advantages over traditional light sources in terms of efficiency, lighting quality, and design novelty, LED lighting can enter and continuously open up the market. On the other hand, the expansion of the market will lead to an increase in production and an increase in industry R&D investment, accelerating technological progress, resulting in improved performance and a gradual decline in cost and price.
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