However, there are times when, even high quality, LED products can last as little as a year. The problem with these can be attributed to a large number of things, here are a few main causes:
Designing a heatsink is a fine science. Some heatsinks do not have the correct amount of surface area, some do not take into consideration about the gaps between fins to enable air flow. Some have horizontal fins, when they are positioned vertically. The main design fault with the latter, being that heat rises. Rather than dispersing the heat away from the bulb, the heat coming from the lower fins heat the upper fins even more.
Most, standard, electronic capacitors are made from a plastic. These have an average life time of around 1 year, if used regularly. Capacitors are part of the circuit in every LED driver. Now a number of companies are making their capacitors from ceramics, giving them a much longer life expectancy.
LEDs are usually designed to work in our country, and in our climate. If they are used in a hot country, or enclosed area, the heat around them can easily surpass the heat they were designed to withstand, shortening their life time.
To get LEDs to their full potential, these factors, among other considerations, must be taken into account.