I have bought just four mains voltage LED lamps, in my life. Three of them have failed. One has failed after only a very few months and is being replaced by the supplier. They claim that these expensive items are supposed to last for tens of thousands of hours. Has anyone else had this problem or have I just been very unlucky? The two GU10 lamps both have two burned out (?) diodes in them - two elements are brown!. At a tenner a time, I just wonder whether they are a step too far, too fast for this technology. Or could they just be bad counterfeits?