First of all, there are two main reasons for the blackening of LED wall washer lamp beads: glue poisoning and low pressure connected to high voltage, which may also be caused by lamp bead quality problems or poor heat dissipation.
Let's talk about the problem of large current first. Many manufacturers blindly pursue the high brightness of LED wall washer lamp, improve the current to improve the brightness, and then increase orders. But this will cause great trouble to consumers, because with the increase of current, the heat of LED wall lamp beads will increase dramatically. When the current exceeds a certain value, the lamp bead is likely to be damaged. Even if the lamp bead is not burned, it is likely to directly reduce its service life. Therefore, the design of LED circuit requires LED to work under appropriate working current, which is to design a constant current source.
Another reason why the lamp beads burn black may also be due to oxidation. If the aluminum electrode is used, it is easy to be oxidized and blackened. The gold electrode may also be vulcanized and blackened.
Of course, in addition to these two main reasons, there are also some secondary reasons, such as poor quality of lamp beads or poor heat dissipation. There are still a few good and cheap things. The lamp beads are also sold for every penny. The quality of the lamp beads that are too cheap will also be poor.
Another problem is heat dissipation. The heat dissipation of LED wall washer lamp is very important. If the heat dissipation is not good, it will not only cause damage to the lamp beads, but also have a great impact on the whole LED lamp cap.