How to tell the quality of LED lights?

Look material, LED unit board sheet: Some LED unit board manufacturers to price competition, the use of low-cost single-sided fire-retardant paper or fiberboard panels made
LED lights for the PCB board. Because, full fiberglass PCB board too expensive. In effect beginning no difference, lucky can hold a half months
, Under normal circumstances within a year will be because of moisture, UV damage, oxidation and other reasons break, causing the entire LED unit board scrapped. High quality
LED unit board must use double-sided full fiberglass PCB board, although the cost is high, but the quality is guaranteed.
IC: IC devices used to observe whether the brand consistency.
Lamp beads and chips: the naked eye can not see, can only be achieved through aging tests.