1, the soldering point there is a phenomenon of virtual welding: this situation is generally due to the lamps in the transportation process, there is too much vibration and protective measures are not done caused by its soldering point with the vibration and fall off, ultimately resulting in the lamp does not light.

2, the quality of solder is not good: If the quality of the LED lamp solder is not qualified, then in the bending, it is very easy to appear brittle solder joints or fall off and other phenomena, resulting in the case of not bright.

3, the solder joints and copper foil separation: LED lights in the installation, the bending angle will be too large and lead to the solder joints and copper foil separation phenomenon, resulting in not bright.

4, circuit board solder resist layer is too thick: LED lights circuit board solder resist layer if too thick, then in the welding process, the solder and circuit board can not all be fused together, resulting in lights do not appear bright phenomenon.