DRIVING REGULATIONS PENNSYLVANIA?!?!?!!?!?

OK i live in pittsburgh pa. im 17 and got my permit. i go driving wit my neighbor(she DOES have a valid license)..im supposed to go driving again this weeken but her one headlight(drivers side) is broken pretty badly...we dnt drive at night. only in the day. so my question is, is it illegal for me to drive a car like that? what wld happen if i gt pulled over, wld my permit be revoked? thanx ;)