LED lamp with the purchase method
1, LED lamp with the chip: Chip has domestic and Taiwan chips, as well as imported chips (including the United States chips, Japanese chips, German chips, etc.). Different chip, the price difference is very big. The most expensive is the American chip, followed by the Japanese chip and the German chip, the price is moderate is Taiwan chip. What is the specific use of the chip? What effect should be achieved?
2, LED Packaging: Resin packaging and silicone packaging. The price of the resin package is cheaper, because the heat dissipation performance is slightly worse, the others are the same. The thermal performance of the silicone package is good, so the price is a little more expensive than the resin package.
3, LED color consistency: At present, there are many packaging plants, large and small add up there are thousands of homes, of course, there is strength of the weak points. There are many small packaging factory because there is no color separation machine, so either the color separations, or external hair, so it is difficult to ensure the quality. Without the separation of light color LED, its poor consistency, installed in LED lights on the point of light after the effect is not so good, of course, the price difference is relatively large.
4, LED welding effect: LED lights with the assembly of manual welding and machine welding two kinds, manual welding is the use of iron, the most original method of welding, solder spot welding solder volume is uneven, the more a circle to cover the solder feet, at the same time, there will be different degrees of tin-tip appearance, this is a typical manual welding phenomenon. This kind of operation way out of the product one is ugly appearance (solder point size inconsistent, flux residue, solder point is not smooth, led packaging is hot and bad, etc.), the second is the electrostatic protection measures are not good, many led chips are penetrated, resulting in a micro-bright or not bright phenomenon. Machine welding is not the same, the use of SMT patch technology, with solder paste and reflow process production. As a result, the LED light on the belt of the solder point is relatively smooth and solder volume will not be much, the welding point is arc-shaped from the FPC pad to the LED electrode at the extension of not only the appearance of welding products Beautiful (solder joint size, solder smooth, helpless flux residue, led package intact), and will not appear the phenomenon of electrostatic burnout chip. At the same time, the position and direction of the LED are more beautiful. This can be seen directly from the appearance.
5, FPC material: FPC spreads copper and deposited copper two kinds, deposited copper is relatively cheap, the pressure is more expensive. The pad of the deposited copper plate is easy to fall off when bending, and the copper will not be rolled. The specific use of the FPC, to see the buyers themselves according to the use of the environment to make decisions.
6, FPC has no environmental certification, UL certification? LED has patents and so on. has been certified and patented, the price is more expensive, not the price is cheap.
7, LED brightness: different brightness of the LED prices, ordinary brightness and highlight the price difference between the LED. Therefore, when purchasing must clearly know what kind of brightness they need, in order to accurately position their products.
8, LED color: color is different, the price is not the same. White, green because of color matching and separation of light is more difficult, so the price than other colors of higher prices, red, yellow, blue color separation is easier, and the consistency is better, so the price is slightly cheaper. Special colors such as purple, brown and so on because of color matching, the price is the most expensive.
9, LED size: Different sizes of LED, the price is different. such as 0603 led and 1210 (that is, 3528) of the LED, the price is significantly different, while 1210 and 5050 specifications of the LED price difference is a step.
10, see the surface of the LED light cleaning degree. If the use of SMT technology production LED lights, the surface cleanliness is very good, can not see any impurities and stains. However, if the use of hand-welding technology production of the cottage version of LED lights, regardless of how the surface cleaning, there will be traces of stains and cleaning, while the FPC surface will have flux and dross residue.
11. Look at the package. Regular LED lights will be used to prevent electrostatic coil packaging, generally 5.1-meter rolls or 10.1-meter volumes, and then outside the use of anti-static moisture-proof packaging bags sealed. And the Shanzhai version of the LED lamp belt will be because of cost savings, and the use of recycled coil, then there is no anti-static moisture packaging bag, carefully look at the coil can see the appearance of the label to remove traces and scratches.
12, look at the label. Regular LED lights with packing bags and reel trays will have printed labels, not printed labels. And the Shanzhai version of the label is printed, while the specifications and parameters are not uniform.
13. See Appendix. The regular LED lights will be enclosed in the box with instructions and specifications, and will also be equipped with LED lights with connectors or card seats, but the Shanzhai version of the LED light box is not these accessories, because some manufacturers can save after all.
Related Industry Knowledge