.
.
.
Used properly, mine last between 5 - 7 years.
I learned the hard way, but found out the reasoning.
CFLs are most suitable for lights that are left on for extended times.
For instance, a closet or pantry light that is only turned on for a few minutes can kill a CFL in months.
Not only that, their is little or no gain economically (hydro usage) in 5 or so minutes as the ballast is still warming up.
Bedroom lights, that are usually on for only half an hour or so also fail earlier than lights left on for extended periods.
I use regular incandescents for the bedrooms and closets, but cfls for side table for reading lights at night as they are usually on for hours.
I use CFLs in my "trouble" light, some call it a drop light - maybe because us mechanics drop them a lot?
Anyhow, the 2 reasons I do this is of course the savings, but an unexpected bonus is the fact they do not heat up much. Even a 50W incandescent can give a nasty burn off the metal cover, and can scorch car carpets and melt vinyl upholstery. CFLs I can lay on the carpet for underdash work and it is never a concern.
Worked one place where my supervisor kept shutting off my trouble light (without saying anything) everytime he walked by it - bulb lasted 5 weeks - SO - replaced the bulb, switched the light on, cut the button, and taped it permanently on. I never unplug the light during the time I expect to be doing whatever I'm doing - 4 years later, bulb is still working.
CC
ps: have LEDs on order - let you know how that works out - I read my own hydro meter daily - yep; EVERY day, so I'll know exactly any difference in consumption.