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Todd Bradshaw asked Why do LEDs seem to burn out rapidly in the tropics?
In the Philippines I have several times encountered samples of LED retrofits for T8 fluorescent lamps that exhibit dim yellow or burned out elements after only a few months. Since LED products are supposed to be longer lasting than fluorescent (and MUCH more expensive) could this be due to poor power quality (like voltage spikes), heat or what?
And got the following answer:
It could be many reasons such as heat dissipation from the LED chip. Humidity plays a role too. Transient pulses can cause issues as well as RF transmission in close proximity. The humidity can become an issue to the point where corrosion might occur in a conductive track, Humidity does have a role in heat dissipation as well. If the installations were done with the classic "wire nuts," copper oxide will form on the conductoirs quite fast in high humidity. Problematic units might be worth soldering instead of just relying on the wirenuts for the connection. Or at least tinning the exposed wire with solder before installing the wire nuts. These connections can become noisy with transient noise that can create spikes high enough to make it through a PWM circuit. In spite of the RoHS initiative, tin/lead solder is going to yield superior results in the Philipine climate because of the nature of lead. Some of the issues of quality of the incoming power can be addressed simply. You might see some mitigation of the problem by installing common mode line filters to the power input leads of the power module supplying the current to the LED modules. Something as simple as looping the power leads through a single ferrite salvaged out of a computer equipment with a small value capacitor of sufficient line voltage between each of the source and return to the common ground of the building's electrical in the most troublesome locations. Quality control of the manufacturer can be a factor too. I have run some LED units from a Chinese manufacturer, (manufacturer is not known), with results similar to what you describe, and in contrast I have run "Power LEDS" from Cree and Lite On (Lite On is a chinese comapny BTW) for very extended periods with not one failure. If you are able to work on the failed units at the board level so you can remove the LEDs, it will be cost effective to do so. It is not difficult to do. You can find many component parts and modules at this company http://www.digikey.com They ship internationally. You can download a catalog even, however some of their offerings are not always in the catalog, but is online. A friend of mine converted some light fixtures with some CREE LED chips that he will be uploading a pretty good description of what he did to his blog within the next few weeks. He meant to do it sooner, but weather interfered. http://altenciruits.wordpress.com/ A lot of free info there with more on the way.