50% of waste after only 3 months ... What a pity!

No equivalent on the market, these lamps are very satisfactory in many respects:
# The light efficiency is equivalent to 40W halogen, (or even higher)
# Warm white very acceptable, with a good IRC
# Very good diffusion 360 and the axis
# Compact and less ugly than others, with a massive heatsink machined aluminum: you get used quickly to their aesthetic, even when they are "visible"

However, I can say that they are not reliable and not yet developed: they heat (too) and the heatsink seems insufficient to play its role.
Is it for this reason (or because of insufficient sorting factory?), I do not know, but here are the facts:

I needed to (6 + 5) and I bought 15, to have 3-4 beforehand, just in case!
Well (or poorly) took me to the end of a month, the first slammed ...
After 3 months, I now have in 9 of 15 (over 50%!) Which are HS ...

105 spent 6 lamps (15) functional after 3 months is no longer of investment over the long term, this is money down the drain .... !!

In the end, my disappointment is as great as the hopes that I had by lighting the first. :-(
I despair of finding the gem a few years ... and I'm going back to my 40W halogen that heat more than they illuminate, death in the soul ... !!