This is a perfect article for those of you who are still using the incandescent light bulbs and think they are cheaper than the much greener fluorescent light bulbs. http://news.bbc.co.uk/2/hi/science/nature/4922496.stm In fact, in Germany the German Federal Environment Agency have just concluded studies that show that "over its 15,000 hour lifetime, a single 20W compact fluorescent light bulb would save 188 euros (£131) worth of electricity." For more information, I encourage you to read the story.