Why is the LED desk lamp dimmer and dimmer?
The more LED lights are used, the darker they become, is a very common phenomenon. Summarize the reasons that can make the LED lamp dim, 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 need electricity, you need a device, called "LED constant current drive power supply".
In theory, as long as the parameters of the driver and the lamp bead board match, you can continue to supply power and normal use. Driver internal complexity, any device (such as capacitors, rectifiers, etc.) failure, may cause the output voltage change, and then cause the lamp dark.
Driver damage is the most common kind of failure in LED lamps, usually after replacing the driver, can be solved.
LED burned
LED itself is a combination of one by one of the light beads, if one or part of it is not bright, it will inevitably make the whole lamp dark. The beads are generally connected in series and then in parallel - so a certain bead burned, it may lead to a group of beads are not bright.
After the burned bead surface there are obvious black spots, find it, use a wire connected to its back, will short it; or replace a new bead, can solve the problem.
LED burned one occasionally, it may be a coincidence. If frequent burning, consider the driver problem - another manifestation of driver failure, is to burn 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 obvious in incandescent and fluorescent lamps.
LED lights also can not avoid light decay, but its light decay rate is relatively slow, generally with the naked eye is difficult to see the change. But it does not exclude the inferior quality LED, or poor quality light bead board, or due to poor heat dissipation and other objective factors, resulting in LED light decay speed becomes faster.
