LED how to distinguish between good and bad?
See packaging. Regular LED light belt will use anti-static coil reel packaging, usually 5 meters roll or 10 meters a roll, and then use anti-static anti-static packing bag seal. The cottage version of the LED light band will be used to save the cost of recycling rolls, and then there is no anti-static moisture-proof packaging bags, a closer look at the reel, you can see the appearance of cleaning labels left traces and scratches.
Look at the label. Regular LED lights, bags, and rolls have printed labels, not printed labels. The Shanzhai version of the label is printed, while specifications and parameters are not uniform.
Look at the cleanliness of the surface of the LED lamp band. If the LED belt produced by SMT process, its surface cleanness is not good, and no impurities or stains can be seen. However, if you use hand welding process produced cottage version of LED lights, regardless of how the surface cleaning, there will be traces of stains and cleaning, and at the same time on the surface of FPC will have soldering flux and tin residue.
1, look at solder joints. Regular LED lamp manufacturers with LED band produced by SMT patch process, with solder paste and reflow process produced. Therefore, the solder joint on the LED light belt is relatively smooth and the soldering capacity is not much, and the solder joint is in arc shapeThe FPC pad extends to the LED electrode. However, the solder joints of the LED lights in the Shanzhai version are not uniform, and most of them appear as a dot to weld the feet. At the same time, there are different degrees of tin tip, which is a typical phenomenon of manual welding2, look at the quality of FPC. FPC points of copper and rolled copper two kinds, copper plate copper is protruding out, look carefully, from the pad and FPC connection to see. The rolling copper is closely connected with FPC, and can be bent at any time without the phenomenon of pad falling off. If the copper plate is bent too much, the pad will fall off and the temperature will be too high to cause the pad to fall off.
Light production because the threshold is low, so many people on this project. But people have experience still have a way to identify, regular LED lamp manufacturer and copycat version of the LED lamp (i.e. in the rental by manual operation of the products produced) is a can come out from the appearance of the eye.
