How to determine the quality of LED module unit board? Some people say that you can roughly determine by visual quality modules, the implementation is really so? At present, many manufacturers of modules similar, even if the appearance is different, structure is the same, the board lamp beads, wire, card slot. So just by the appearance is not good or bad judgment, you will also need to identify the following ways:
1. brightness comparison, acrylic plate close to the same number of modules and then slowly lifting short distance, here to watch the brightness lamp beads can meet their demands. Of course, inside the module directly on the word more direct.
2.by comparing the current size of (this is very important). Many users are based on observation to determine the resistance model, in fact, this is unscientific, the resistance can not determine the size of the overall size of the current module, because of the different light bead size and raw materials, the resistance itself is not the same, so it is still in the overall the current reference to the more scientific. White theoretically general <= 20MA, other <= 25MA, due to the different sizes and chip SMD module chip materials used some slightly larger carrying capacity is large, practical application in order to meet the higher brightness, there may be two -5MA improved. In practice, some of the signs started brightness can also, over time, as long as a year, short of 3-5 months to become sleepy secretly, especially white; the reason is too bad light, but the fundamental reason is too much current. More reason to do so, it is because the vast majority of users do not have the conditions to judge this chip production at the structure and size and longevity alone theory is difficult to guarantee the factory to tell the truth. So only use this simple method and provided by the manufacturer to determine whether the price for you.
3. brightness while watching, pay attention to whether the uniform light lamp beads, when considering whether to use light-emitting surface will shine as the brightness of the impact of differences in appearance. White observed when we must note that there are no color (this is important) - If you use a piece of thin white paper covering the above may not be observed, so use acrylic certain thickness. Whether the color is white to distinguish between good and bad quality of the module the most important part, is also one of the main reason for the price difference. Spectroscopic equipment shortage in the market price of the mainland and even expensive, thus leading to many white color LED modules on the market, exposed lights. A white sign inside, some places appear cool white, some are white, some warm white, and even red, purple, blue and so on, it looks like a big painted face like. This is the color or caused serious bad light; a group of white modules, put something discovered color inconsistencies, or the number of inconsistencies with the next batch, this is because there is no reason for splitting or sub Debu fine.
4. wire identification. Silicone Case, UL certification through the United States, which by the manufacturer's instructions are not reliable, the most direct way is to poke the skin, count the number of cores inside! 15,17,19 core even with multi-core lines 20,30 modules should be poor than 14,11 core modules, and vice versa.
5. the temperature of the lamp beads. Lighting for some time, to touch the lamp beads, high temperature hot even certainly not good low-temperature stability.
6. solder quality. Spot welding process full proof, high brightness with good proof of solder; serious is Weld, prone to poor contact. So that subsequent maintenance problems.
7. Epoxy processes. Depends on the coverage of glue.
8. glue quality glue is good, can be more a long time.
9. full-color module in addition to the above aspects, but also the need to identify IC and auxiliary components. The above is about how to distinguish between good and bad LED module unit board method to determine the specific needs of some professionals to be much easier, so much before buying advice, contrast.
