dunno about headache but back ache is a deffinate possibility
the cup jhust surround in paper or tape just as long as light doesent get to the roots
seriously take the lap apart get a larger beer can cut each end of with tin opener then cut from one end to the other so u got a tube of can then FASTEN that to the ceiling or w/eva it is and mount ur bulb in that OR cut the lamp wooden base in half so you would have like a small spear but instead of a spike u got a bulb THEN use the wooden bit to fasten up the bulb (make sure u dont cut thru the wire
so eccectively will look like this