When temperature can't dissipate from the heat sink, it can cause lamps to fail prematurely. An LED light may degrade because LEDs emit light that decreases exponentially as a function of time and temperature.
Here are some tips to avoid LED lighting failure:
1) The most significant cause of LED lighting failure is the source. For example, shipping may hit a connector loose and negatively impact performance.
2) To reduce the possibilities of LED lighting failure, ask the manufacturer about its testing procedures.
3) Look up UL registration number. Verify a UL mark by visiting the free UL Online Certifications Directory.
4) Search for DLC qualification. It means these have been tested and estimated to distinct performance.