Our house is five years old. ALL of the original incandescent bulbs have burned out, at least once, and some many more times than that. For sake of argument, let's say those incandescent bulbs consumed 60 watts each. However, most of the bulbs in our home were compact fluorescent (CF). ALL of those have aged in five years to the point where, when you turn them on, they are very frustratingly dim, and take 5-10 minutes to warm up to an only mediocre light output. Let's say 20 watts consumed each for the CF. Over time, we have begun replacing all with LED bulbs. The LED bulbs come on full bright instantly, at about 7 watts each. And none have failed, ever. There are even LED bulbs which mimic incandescent lighting patterns. And they are now cheaper than CF in many cases.