Recently we checked a batch of LED Bulk Head（UK market）, unfortunately, these lights are failed in the IP inspection.
After research by Back Morning’s engineer, we found the reason is: the supplier changes the PC shell without a proper “Raw Material Change Management Process”.
By detail checking, we found:
The PC shell’s thickness is different: The new one is thinner than the old one. This caused a big problem---There is a gap between the Shell and the silicon rubber ring, seal not good. So the water goes inside.
According to the general quality management process, we have to pay attention to the changes in 5M1E. 5M1E means:
This 5M1E theory used in the auto industry, air plan industry, food industry, and LED lighting industry. In this case, the PC Shell is an important Material, which affects the Lighting’s lumen and IP. Unfortunately, the supplier didn’t pay attention to this Material Change, it caused the quality problem.