Lighting takes very little power once you switch to LEDs. I replaced all the bulbs in my house a couple of years back, and the total draw - were we to turn all interior and exterior lights on at once - would come in at around 250 watts. This is effectively negligible - the refrigerator alone uses at least twice that much.

In any case, the real answer is not solar by itself, but solar plus other sustainable sources like wind and hydro.