How much light you need depends on what you're doing and how old you are.
If older you need more light, no joke. If assembling tiny stuff you need more light
and it needs to be more directional for better depth perception.
In my basement shop I wanted to simulate a room with windows on one side
so I installed a continuous row of two tube T-12's ('cause I'm cheap) along the wall
just out from the shelves. Over the floor area I added some more fixtures in a wide
spread pattern. Then, installed fixtures directly over the table saw and work bench.
If cost isn't a big deal install a lot of fixtures and put them on a few switches so
you can power them up as needed. Also, as pointed out above, the closer the light is
to the stuff you want to see the brighter the light will be so avoid the temptation to
install them as high as possible just to get them out of the way.