agreed with "low power with few units", but do note that.
one light = one highlight, one shadow
two lights = two highlights, two shadows
ten lights = ten highlights, ten shadows
so if you want to use more lights, be careful where you want your highlight and shadows to be.
side note: (be careful about this suggestion), if someone tell you to place another light to kill a shadows, it will create another shadows, so will suggest to place a third light to kill the second shadow, and fourth light to kill the third shadows, and it will go on and on and on and on....