The characteristics of LED are very obvious, long life, high luminous efficiency, no radiation and low power consumption. LED lamp as a new generation of energy-saving and environmentally-friendly lighting source, although only a few years from the earliest appearance to the present, but the rapid development also witnessed a process of continuous improvement and innovation of a product. 　　 LED lamp development stage First generation L ED tube In the early days ( around 2005 ) , the LED tube housing was made of plastic, the lamp bead was made of F5 straw hat LED lamp bead, the circuit board was made of fiberglass board, and the power supply was built-in non-isolated power supply. The effect is about 40-60LM/W . There is a problem: However, it was quickly discovered that the light decay of this kind of fluorescent lamp is very serious, and the life span is actually only 1000-2000 hours. This is mainly caused by the straw hat lamp packaging structure and the material of the lamp tube. Because the heat dissipation of the straw hat lamp mainly depends on two legs. In addition, the lamp circuit board is a fiberglass board, and the outer casing is all plastic, so the overall heat dissipation performance is very poor. The heat generated by the whole lamp is sealed in the tube and cannot be discharged at all, which leads to the whole process. The lamp will be scrapped in a short time, which also makes consumers lose confidence in the LED tube. Regarding the problem of heat dissipation of LEDs , poor heat dissipation can cause unnecessary fires to occur. Second generation LED tube When people found that the straw hat light was not suitable for the lamp, most manufacturers began to use the patch light source to make the fluorescent lamp around 2007. The outer casing also began to use the semi-aluminum semi-plastic, and the circuit board began to use the aluminum substrate, but this is quite a mess. During the period, the light source used was 352830205050, etc., and even 1W high-power LED , and because the scheme adopted by each family is different, the whole lighting effect is about 60-80LM/W , the power supply is built-in, external, isolated, non-isolated. coexist. At this point, the buyer has become confused, and the prices of various products vary greatly, and I do not know how to choose. Third generation LED tube 2009 or so, due to the rapid development of LED, LED lamp beads light efficiency is rapidly improved, high light efficiency (100LM / W), heat, a small volume of 3014 SMD LED begins design fluorescent lamp, the entire lighting efficiency is also raised to 70-100lm/W, this stage has a good effect, the price has dropped a lot, and sales have started to rise. At this stage, the mainstream products in the market are mainly 3528 and 3014 , but there are still many gaps between the price and the target of ordinary people. Fourth generation LED tube Around 2011 , the 3014 patch was used as a fluorescent lamp. Due to the increase of the luminous flux of a single LED lamp bead, the number of LED lamp beads used was also reduced and the cost was reduced when the same luminous flux was achieved . More importantly, 3014 The advantages of better heat dissipation, higher light-emitting area, better light output, etc., can be concluded that using a 3014 SMD LED as a core light source will inevitably be a trend in a relatively long period of time . Dongguan Yijia Optoelectronics Co., Ltd. , https://www.everbestlcdlcm.com