[Source: "High-tech LED - Technology and Applications" May issue Yan Chongguang] LED as a new generation of energy-saving, environmentally friendly, long-life lighting source has become the consensus of all mankind. LED lighting fixtures have not been widely promoted and applied so far, and cannot enter thousands of households. The main reason is that the price of LED lighting fixtures remains high. A 5W LED bulb, its brightness is equivalent to 25-30W incandescent lamp, the current retail price of the market is RMB 50-100, which is much more expensive than fluorescent energy-saving lamps. Now the people buy fluorescent energy-saving lamps, the government still has subsidies, buy LED lights yet! Therefore, it is recommended to develop affordable LED bulbs and LED fluorescent lamps that the ordinary people can afford.
Today, LED light sources are continually cutting prices, and the price of new generation chips for LED drive power is also falling, and the price of matching hardware and plastic parts is also falling. Therefore, the time to design and produce affordable LED lighting fixtures has matured.
The market follows the pyramid rule, and high-priced products can only occupy a small part of the spire, and the price drops a little every time, and the market expansion is multiplied by the square
(Figure 1) . The low-priced LED lighting fixtures will be a popular product that civilians can enjoy, and a new generation of lighting fixtures that ordinary people can afford.
Figure 1 Pyramid rule of the market
With the large price reduction of LED light source and the high integration of LED chip power supply chip function, the power cost of the power supply is gradually reduced. If you can put the price of 5W-10W (equivalent to the brightness of 25W-60W incandescent lamp) The production cost of LED lighting fixtures is controlled within 8-25 yuan, and the retail price of the market is controlled within 15-35 yuan, so that the retail price of the cheap LED bulbs is close to the retail price of fluorescent energy-saving lamps of the same power, then LED as the fourth The replacement of incandescent lamps and fluorescent lamps by the generation of light sources will be greatly accelerated, and the price of cheap LED lighting fixtures into the trillions of ordinary people will become a reality.
If the government can supplement the financial subsidies for affordable LED lighting, it will enable the people to benefit earlier and enjoy it earlier, so that the society can save more energy.
Design ideas for affordable LED lighting The design idea of ​​affordable LED lighting fixtures can be used, quality first, and low cost. The production cost of 5W-10W parity LED lighting fixtures equivalent to the brightness of 25W-60W incandescent lamps is controlled within 8-25 yuan. The market retail price is controlled within 15-35 yuan.
Taking the cheap LED bulb as an example, it consists of an LED light source module, a constant current driving power supply, a lamp holder, a casing, a radiator, and a lamp cover (Fig. 2). The overall composition of LED fluorescent lamps is also basically the same. How to choose each of these components is the key to designing the success of this affordable LED lighting fixture. The LED light source is selected to have high luminous efficiency, low heat generation, good heat dissipation and good cost performance. The constant current driving power source is selected to use primary side control (PSR) isolation circuit, few peripheral parts, high power factor, high efficiency, and good cost performance. For the guidelines.
For more information, please refer to the May issue of "High-tech LED-Technology and Applications" magazine. 
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