I bought a set of 4 off 12v MR16 COB bulbs - in the end they cost me nothin g as I ordered warm bulbs and was sent cold ones so got a refund.
After 6 months one failed and a couple of months later a second in a simila r manner of flashing and then dead.
I've now found that the base housing just screws off giving access to a bit more complex a bit of electronics than I expected - a 15mm square pcb with what might well be a switching regulator under a layer of white silicone.
Has any one explored one of these a bit further ?
I've tended to discourage the use of mains powered leds as the voltage drop must put a fair stress on any electronics but I didn't expect to find this on 12v ones.
The incandescant bulb was so simple - maybe that is why the design was so l ong lasting. The basic LED is long lasting too on the same principle, but i t is not going to work as an acceptable light source if like the compact fl uorescents it has to have electronics to drive it.
Rob