Business Green: Fresh from banning energy-efficient light bulbs, legislators in Brussels are considering imposing a ban on all light bulbs. According to sources at the European Parliament, MEPs have become so frustrated with the extent to which even energy-saving light bulbs are left on unnecessarily that they are considering legislative action to tackle the problem. "Banning incandescent bulbs has worked very effectively, so why not ban those bulbs that are being left on all the time wasting …