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Update 27/03/2015
I have to revise my positive judgment.
Meanwhile, I have 16 to 20 of these lamps tested, always from the same seller. Here I discovered that about half of them were useless. Different light color and luminosity to total failure. Around 50% of the LEDs used went back what money went smoothly back of equip. It's just annoying the unnecessary expense. Could be avoided if a quality check would be carried out before shipment.
No problems during installation when different version types, size in technical skill not an issue.
The transformer can when minimum power consumption are installed transformer, cause flickering, or it is nothing.
The light quality is surprisingly good, and keeps a comparison of a 20 watt lamp was loose. I certainly can not tell the difference. The price is sensational in this quality. Buy recommendation on my part, if one takes the failures as described above in purchasing!