LED beads are required to work at low dc voltage (below 20V), but our normal mains power is ac high voltage (ac 220V). The electricity needed to turn a municipal power supply into a lamp bead requires a device called an "LED constant-current drive power supply".
In theory, as long as the drive parameters and LED bead plate match, you can continue to supply power, normal use. The inside of the driver is more complex, any device (such as capacitance, rectifier, etc.) failure, it is possible to cause a change in the output voltage, and then cause the LEDs dark.
The SMD LED lamp have many different quality level, some factories just chose low quality LEDs for saving the costLEDs are very sensitive to static electricity, welding or debugging, careless operation may lead to this imagination, and sometimes bad weld of the chips would cased the LEDs to be dark or damaged.
The so-called light wane is the light of the LEDs lower and lower - this situation is more obvious in incandescent and fluorescent lamps.LED lights also can not avoid light wane, but its light decay speed is relatively slow, generally with the naked eye is difficult to see changes. But also do not exclude poor LED, or poor quality light bead board, or due to poor heat dissipation and other objective factors, leading to rapid LED decline.
Company：Shenzhen Linsn LED Co.,Ltd.
Add：Building 11,SanLian Industry Park,SongBai Road,BaoAn District,Shenzhen,China.