Not knowing exactly the LEDs you are referring to is kind of moot. The units are probably cheap and not worth the trouble to go through the effort. Not all LEDs are the same. Cheaper ones will expire much sooner than a quality diode, for a number of reasons. To get some good information, easily stated, visit the Bebi Electronics website Bebi Electronics-Home of the Finest Marine LED Lighting Products on Sea (or Earth)!
When looking for LEDs, CREE Inc. is a US manufacturer of high quality LEDs. By the way, getting the smoke back in is problematic but finding OEM smoke is even harder!