[Milad]

Originally Posted by mike31154

Dimmable PAR38. MR16 base LEDs are now also available, run straight off 12VDC, no soldering, just need the MR15 sockets.

http://www.ebay.ca/itm/110646443892?...84.m1423.l2649

MR16 in cool white, I'm sure if you search, other colours are available, including blues. If one burns out, pull it & plug in another.

http://www.ebay.ca/itm/260807325869?...84.m1439.l2649

MR16 sockets

http://www.ebay.ca/itm/360261138385?...84.m1439.l2649

The idea is, if you are doing it right, none will burn out for at least 10 years.
The links you posted are very cheap LEDs and not worth the money on every single one of them ($65 for 1w LEDS?!?!). For close to the same price you can get the same par38s with the proven CREE 3w LEDs.