LED lights become darker as they are used because LED lights have light decay phenomenon.
The light decay of LED lamp products is the weakening of the light signal during transmission. At this stage, LED products made by major global LED manufacturers have different degrees of luminous decay. High-power LEDs also have luminous decay, which is directly related to temperature. It is determined by the chip, phosphor and packaging technology. At present, the light decay of white LEDs on the market is one of the most important issues in the march to civil lighting.
It is a very common phenomenon that LED lights become darker as they are used. In addition to light decay, sum up several other reasons that can make LED lights dim, nothing more than the following three points.
1. Drive is damaged
LED lamp beads require low DC voltage (below 20V), but our usual mains are AC high voltage (AC 220V). To turn the mains electricity into the electricity needed by the lamp beads, a device called an “LED constant current drive power supply” is needed.
In theory, as long as the driver’s parameters match the lamp bead board, it can be continuously powered and used normally. The internal part of the driver is more complicated, any device (such as a capacitor, rectifier, etc.) failure may cause the output voltage to change, and then cause the lamp to dim.
Driver damage is the most common type of failure in LED lamps and usually can be resolved after replacing the driver.
2. LED burned out
The LED itself is a combination of lamp beads one by one, if one or part of them is not bright, it will inevitably make the whole lamp dim. Lamp beads are generally connected in series and then in parallel-so if a lamp bead burns out, a batch of lamp beads may not light up.
There are obvious black spots on the surface of the burnt lamp bead, find it, connect a wire to the back of it, and short-circuit it; or replace a new lamp bead to solve the problem. To
The LED burns out occasionally, it may be a coincidence. If it burns frequently, the driver problem must be considered-another a manifestation of driver failure is to burn the lamp beads.
3. LED light decay
The so-called light decay is when the brightness of the luminous body is getting lower and lower-this situation is more obvious in incandescent lamps and fluorescent lamps.
LED lights can’t avoid light decay, but their light decay speed is relatively slow, and it is generally difficult to see changes with the naked eye. However, it is not ruled out that poor-quality LEDs, poor-quality light bead plates, or objective factors such as poor heat dissipation, result in faster LED light decay.