Hi and thanks big517 for your interrest.
I will put many reserves on the link you give. These kind of led bulb does not provide brightness. First it's MR11, smaller than MR16 bulbs. Then they are fitted with standard LED, and that's a problem. It's not powerfull at all. I think it will produce equivalent of 15W incandescent light, it will probably be not more than 1 or 2w real consumption.
You really should go for at least 5050SMD or CREE high power model LED on a MR16 bulb.
No issue with wires, we talk about really low wattage, so no problem with any kind.