China joined the WTO in 2001, the Ins and Outs, the domestic industry is also quietly with economic change. At that time, also is in the Chinese product is king of the times, such as domestic lighting, electrical, plastic light industry enterprises. In street industry, for example, at first said the premise of the market demand-oriented, national industrial policy guidance, learn new technology from abroad, the rapid development of street lighting products to market, the development of business in the street when it easy to become a brand, because it fills gaps in street markets, in a little later, lights companies started manufacturing innovation and new product management, marketing approach has not really taken seriously businesses. In the later times where the production of 250-watt sodium lamps good, close around 2008, began to be companies realize the importance of marketing 250 watt sodium lamps, street light pole, street lamps and other products in the product after quality competition, began to focus on marketing, but when the international community energy saving theory of LED lights, solar lights do develop an any other advertising are not lead to the marketing storm, domestic media reported the truth, because energy-saving lamps not only save national resources , the country, the most important is that it is a national industrial technological level of a symbolic way. What is the rapid development of the industry, small industry considered to be lights in a certain time and space to maximize meet the market demand, maximize resource utilization benefits of social enterprise. Bo tells the good cause Tier 1 LED, do not use bipolar power devices Doug Bailey pointed out that due to the bipolar power devices cheaper than the MOSFET, usually about 2 cents a, so some designers led the drive to reduce costs Use bipolar power devices, it will seriously affect the reliability of the circuit, because as LED drive circuit board temperature lift what a good 250-watt sodium lamps quality, effective operating range of bipolar devices will rapidly shrink. 2, do not use voltage of 600V MOSFET breakdown voltage of 600V MOSFET cheaper, many believe led lamp input voltage is generally 220V, so voltage 600V 250 watt sodium lamps sufficient purchasing whom home, but many times the circuit voltage to 340V, there is a surge in time, 600V breakdown of the MOSFET can be easily, thus affecting the LED lamp life, in fact, the choice of 600V MOSFET may be some cost savings, but it is the price paid for the entire board, so " Do not use 600V voltage of the MOSFET, the best selection of voltage over 700V MOSFET. "he stressed. 3, try not to use electrolytic capacitors LED driver circuit in the end not to use electrolytic capacitors? There are supporters and opponents, supporters believe that if you can control the temperature of the circuit board, extend the life of electrolytic capacitors in order to reach a goal, such as the choice of 105 degree life of 8000 hours of high temperature electrolytic capacitors, electrolytic capacitor life estimation formula accepted "temperature is 10 degrees lower, life expectancy doubled," then it at 95 degrees ambient operating life of 16,000 hours, at 85 degrees ambient operating life of 32,000 hours at 75 degrees ambient operating life of 64,000 hours, if the actual lower operating temperature, then life will be longer! What is a good 250-watt sodium lamps quality, the great cause of outdoor lights, 250 watt sodium lamps cause by Henan Bo Lighting Equipment Limited. Henan cause Bo Lighting Equipment Co., Ltd. (www.zzdybcdj.com) is Zhengzhou City View light fixtures leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the cause of the leadership with the staff warmly welcome all inquiries negotiations to create the great cause of a better future.