12 gauge wire can easily handle the current needs of household LED lighting. Most modern houses in the US have 14 gauge. That can still be made to work. The re

12 gauge wire can easily handle the current needs of household LED lighting. Most modern houses in the US have 14 gauge. That can still be made to work. The real reason -- as another commenter here said -- is that the lights would have to be in series and all must require the same current.