http://www.diychatroom.com/f18/sub-panel-grounding-13219/
sorry for the link,(united states NEC explanation) but this is the best way I can think of explaining it to you. I am an electrician in Canada, but obviously electrical codes are different in the united states.
call your local...
GE makes A 13 watt led that is good for 850 lumens. being an led, it is also almost vibration proof, which is what causes a lot of incandescent, and cfls to stop working prematurely. (850 lumens is brighter than a 60 watt incandescent, but not as bright as a 100 watt incandescent)