Why did the LED lights change to be darkened?
The LED lights will become increasingly darkened by working for a long time. The darker they become, is a widespread phenomenon.
Summarize the reasons that can dim the LED lights, no more than the following three points.
Driver damage
LED lamp beads require low DC voltage (below 20V) to work, but our usual utility is AC high voltage (AC 220V). The utility power into the light beads needs electricity; you need a device called “LED constant current drive power supply.”
In theory, as long as the driver and the lamp bead board parameters match, you can continue to supply power and regular use. Driver internal complexity, any device (such as capacitors, rectifiers, etc.) failure, may cause the output voltage change and push the lamp dark.
Driver damage is the most common kind of failure in LED lamps, and usually, after replacing the driver, it can be solved.
LED burned
LED is a combination of one-by-one beads, and if one or part of it does not light up, it will inevitably make the whole lamp dark. The beads are generally connected in series and then in parallel - so if a certain bead burns, it may lead to a group of beads that are not bright.
After the burned bead surface, there are prominent black spots; find it, using a wire connected to its back, shortening it; or replacing a new bead can solve the problem.
LED burned one occasionally, and it may be a coincidence. If frequent burning, consider the driver problem - another manifestation of a driver failure is burning the lamp beads.
LED light decay
The so-called light decay, that is, the luminous body’s brightness is getting lower and lower - this situation is more evident in incandescent and fluorescent lamps.
LED lights also can not avoid light decay, but their light decay rate is relatively slow. Generally, with the naked eye is difficult to see the change. However, it does not exclude the inferior quality LED, poor quality light bead board, or poor heat dissipation and other objective factors resulting in LED light decay speed.
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