The link says they are 12v DC lamps? Why have you AC in the title?
It is impossible to know if they are identical to similar looking lamps that I have been using for some time.
Recently I got some 12v GU5.3 / MR16 Ac/Dc lamps in Sainsbury's for £4 each. I only noticed now that they are suitable for AC as well as DC.
They have a plastic lens on the front that can easily be sawn off with a small hacksaw. Then they are significantly brighter than any other LED lamps I have tried. They have 4 LEDs and claim to provide 350 lumens. However I don't think I could tell a lumen from a lux even on a dark night.
It is easy to take out the parts and fit them into other lampholders and they also have the big benefit that the lamp is separate from the electronics so the electronics do not get fried - which happened with two other very bright small-format lamps that were much more expensive.
...R