The diode of an LED flashlight is not the highest in the entire cost. But the outer shell is made of magnesium aluminum alloy. The most important thing is the quantity and process. The products produced by large factories are more formal, with sufficient quantities and exquisite craftsmanship. And some small factories have very rough craftsmanship. LED also needs to control the current, otherwise it will easily burn out. So the selection of LED must pay attention to the above points.