Like a lot of folks I bought into all the hype about CFL bulbs and replaced every incandescent bulb in the house with those things. Within a few months they began to fail at a cost of about $7 each! I did some online research and found out that there is a lot of difference in the quality of CFL's and they don't do well in applications where they are turned on and off frequently - you know, like in your house! Apparently I needed to buy even more expensive CFL's and leave them on all the time to "enjoy" all the benefits of this new technology. Now when one burns out, it gets replaced with one of those old fashioned, inefficient, cheap incandescent bulbs.
All true but the key pharse here is, "they don't do well in applications where they are turned on and off frequently".
I've had one in the garage that has burned constantly for 5 yrs. The front and back porch lights (CFL's) have lasted 3 yrs, so far.
Kitchen and bathroom where they get turned on and off alot? They last about 2-3 weeks. (same brand as outside & porch lights)