Firstly, our products are produced in strict quality control system and the defective rate will be less than 0.3%.
Secondly, during the guarantee period, we will send new LED aluminum channel with new order for small quantity. For defective batch products, we will repair them and resend them to you or we can discuss the solution including re-call according to real situation.
Yes, the LED strip light needs channel diffuser. LED strips are easily damaged and turn yellow when exposed to dust and physical contact if the strip light is used alone. The LED strip lights can be better protected by using an extruded LED aluminum profile heat sink and diffuser