Linsheng Summarizes The Dimming Of Led Lights: Three Factors
The darker the LED light, the more common it is. linsheng summed up the reasons for the dimming of LED lights and summarized the following three points.
1. Drive damage
LED lamp beads need to operate at DC low voltage (less than 20V), but our usual main power source is AC high voltage (AC 220V). To convert mains power to the power required by the lamp, you need a device called “LED Constant Current Drive Power.”
In theory, as long as the parameters of the drive match the bead, the power supply can be used continuously and used normally. The internal structure of the driver is complex, and any device (such as capacitors, rectifiers, etc.) can cause variations in the output voltage, which can cause the lamp to dim.
Drive damage is one of the most common faults in LED luminaires and can usually be resolved after replacing the drive.
2.LED burned down
The LED itself consists of a lamp bead. If one or a part of it is not lit, it will inevitably darken the entire fixture. The beads are usually connected in series and then connected in parallel – so if the lamp bead burns, it may cause a batch of beads to close.
After burning, there are obvious black spots on the surface of the lamp. Find it, connect it to the back of the lamp with a wire, short it, or replace it with a new one.
It’s a coincidence that the LED burns one at a time. If it burns often, consider the drive problem – another manifestation of drive failure is burning the lamp beads.
3. LED lamp attenuation
The so-called light attenuation is that the brightness of the light source is getting lower and lower – this situation is more obvious on incandescent and fluorescent lamps.
LED lights cannot avoid light decay, but their light decay rate is relatively slow, making it difficult to see the changes with the naked eye. However, it does not exclude inferior LEDs or inferior beads, or due to objective factors such as poor heat dissipation, resulting in faster LED light attenuation.