Not long ago, Mr. Hao from Beijing wanted to purchase about 1000 downlights, mainly wanting to use it at the venue. He used Baidu search to focus on the e-commerce platform dedicated to LED lighting, China LED Trading Network (http://led. 99114.com/), and Mr. Pan from the Institute of Optical Precision Machinery of the Chinese Academy of Sciences wants to purchase LED arrays in bulk. Like Mr. Hao, he came to the China LED trading network, which brings together huge LED lamp manufacturers and Buyers have formed a complete LED industry ecological chain with a certain reputation and influence in the industry. So it attracted many buyers like Mr. Hao and Mr. Pan! LED downlights and arrays are all LED lighting. When it comes to lighting, everyone is familiar. Many people may like the night in the city. At the beginning of the lantern, let the people who have been tired for a day stop and appreciate the beauty around them. Brought warmth. But do you know how much electricity used by these illuminating lights occupies society? Do you know that China's lighting electricity accounts for about 13% of the total electricity consumption in the whole society. Is this electricity consumption one of the accomplices of global warming bipolar glaciers? Our living homes are plagued by various pollutions. If you replace all the incandescent lamps in use with LED lighting, you can save 350 billion kWh per year, which is equivalent to the power generation of four Three Gorges hydropower stations. It’s really scared by this data. LED lighting is so amazing! LED lights are not only environmentally friendly and energy-saving, but also have no harmful substances of mercury. White LEDs consume only one-tenth the energy of incandescent lamps and are a quarter of energy-saving lamps. And the life expectancy can reach more than 100,000 hours. The lighting for ordinary families can be described as "one time and for all." Last year, the market penetration rate of LED lighting was 31%, and the global lighting market reached 82.1 billion US dollars. Such huge data cannot be separated from the rapid progress of LED lighting technology. There are many types of LED lighting, which can be divided into municipal traffic lighting, architectural landscape lighting, commercial lighting and civil lighting. The information, price and information of these lighting products can be found on the China LED trading network. To talk about the high-quality manufacturing enterprises in China's LED trading network, the author had to recommend Beijing Shenan Investment Group Co., Ltd. for the buyers. It is reported that Shen'an Group is a high-tech enterprise of LED light technology integrating design, research and development, production, sales and engineering construction. Shen'an Group's enterprises have developed a number of national patents for the development of energy-saving and environmentally-friendly high-brightness LED lighting products. Shenan has established branches and joint ventures in Canada, the United States, and Australia. In 2007, Shenan High-brightness LED high pole lights with Shenan Group's independent intellectual property rights were successfully lighted at the Capital International Airport Plaza, and the style remains the same. Winning users are highly praised. Subsequently, this product has successively been in T1, T2 terminal, Tianjin Airport, Shandong Linyi Airport, Dezhou High-speed Railway New District, National New Media Industry Base, China Millennium Monument, Jingcheng Expressway, Jingping Expressway, Jingkai Expressway, Beijing-Shenyang Expressway, Wide-ranging applications such as overpasses, toll stations, tunnels, service areas, etc. of the South Line of the Airport and the Beijing Sixth Ring Road A 6 layer PCB board is in general a 4 layer PCB Board with 2 extra signal layers added between the planes. The 6-layer PCB classic stackup includes 4 routing layers (2 outer layers + 2 internal layers) and 2 internal planes (one for ground and the other for power). This enhances the EMI dramatically by offering 2 buried layers for high-speed signals and 2 surface layers for routing low speed signals. The signal layers should be closed to the adjacent planes. 6 layer PCB Storm Circuit Technology Ltd , https://www.stormpcb.com