[AT] LED lights

[DDSS]

The cost of 110-volt LED's is still pretty high and there doesn't seem to be 
much available on high-output, at least that I could find.

I know they use 12-volt lights on boats and vehicles but am wondering why I 
could not do the same in our barn.

There are quite a few 110v power supplies that output 12-volts DC.   saw one 
that might work on Amazon... 
http://www.amazon.com/Audiotek-Output-Mobile-Supply-AT-PS36/dp/B00DERSXWI/ref=sr_1_94?ie=UTF8&qid=1415469220&sr=8-94&keywords=12volt+power+supply 
LED's draw about 3 watts each, so they really don't take a lot to power 
them.

Has anyone done this?  I am not sure how much line loss there is with DC

Thank you.