There are many different versions of DIN Connectors. The name of each type comes from the number of pins the connector has (3-pin DIN, 4-pin DIN, etc.) Some of these pin numbers come in different configurations, with the pins arranged differently from one configuration to the next.
DIN cable connector 3-pin, 4-pin, 5-pin, 6-pin, 7-pin, 8-pin degree 180, 216, 240, 262, 270
DIN cables, DIN connector, telephone cable, computer cable, audio cable ETOP WIREHARNESS LIMITED , https://www.wireharness-assembling.com
As the first echelon city to promote energy conservation and emission reduction in China, the replacement of 125,000 traditional high-pressure sodium street lamps in Nanjing is a tempting city for domestic LED manufacturers. However, Nanjing's urban construction department does not simply believe that Amazing energy saving numbers on the manufacturer's brochure. Since the first half of 2008, Nanjing Street Lights has conducted a “PK test†of domestic LED products on the Taishan Road in Hexi. Products from six major manufacturing companies nationwide were installed on the same street, and data was recorded in accordance with the national standards for traditional high-pressure sodium lamps. The results of the half-year test were astounding: only the illuminance of the power of the two products was comparable to that of the high-pressure sodium lamp. Liu Lei, deputy chief engineer of the street lamp department, analyzed that the reason for this result is that the standards implemented by everyone are different. For example, some products are unqualified, but the brightness is higher than the national standard. Whether such products are qualified or not can be defined.
Standard chaos also leads to an increase in maintenance costs. According to Liu Lei, the traditional high-pressure sodium lamps are broken, and their maintenance personnel can know which parts are out of the problem in 5 minutes. However, because there is no uniform national standard, the position and size of various parts of LED lights are different, so it is very troublesome to check the problem. There was an extreme incident in the test. The lamp of a certain manufacturer was broken, and the technicians were not well repaired. The technicians said that because the product was replaced too fast, the product had been eliminated.
“If the current situation has not changed, LED street lights cannot replace traditional high-pressure sodium lamps,†said Zhao Jianping, vice president of the China Lighting Society.
Near the Spring Festival, to make the night of Hunan Road Commercial Street more festive, yesterday, the workers maintained the city's largest Lion Bridge art lighting tunnel. It is understood that more than 20,000 ordinary light bulbs in the light tunnel have been replaced with LED bulbs, which are half the electricity saving and the service life is greatly extended. 
LED street lamp industry urgently needs the national standard
In the urban construction, the replacement of traditional high-pressure sodium lamps by LED street lamps is the general trend of energy conservation and emission reduction, but the premise is that the unified standards implemented by the whole industry must be introduced as soon as possible. Yesterday, at the high-level seminar on “Harmonious City, Light and Shadow Future†organized by the internationally renowned lighting company Philips, many experts in the field of lighting at home and abroad have called for the introduction of national standards for LED street lamps as soon as possible.