Hiya.

First, try removing the 'big ball around everything'. See if you get light from the sun then.

Second, make sure that your lights radii are not too big or too small.

Third, if none of that works, start smaller. Make a box and put a light on top of it. Compile and run to see if everything's working. If it is, continue adding stuff bit by bit, checking along the way, and see if/when something breaks down.

Oh, and a screenshot or two make all the difference in the world for describing what's going on.