Factors to the Quality of LED Lighting

Since led light become popular, quality becomes much important than ever before, Factors leads to the quality, I think there are, 1, led chip, 2, LED driver, 3, Aluminum heat sink, 4, wire, 5, heat conduction glue, 6, enviroment, 7, craft, 8, other factors, follow is one nice example of high quality downlight, unique heat sink and Japan imported citizen cob chip, SAA approved dimmable driver, more detail pls view: