In my old house DH had put some CFL lights in my bathroom that got brighter as they warmed 5 of them in fact I HATED those with a passion because the bathroom is 1 place I tend to want instant light usually I was in an out before the lights ever got bright enough to see what I was doing. That was the only room I noticed the lights getting brighter as they warmed.
I don't care for the CFL lights either, in my old house I had a hanging light that took 5 blubs an was forever replacing those bulbs the CFL's did last much longer in that light than the reg bulbs ever did.
My electric com ran deals monthly take in 5 canned good get 5 CFL bulbs free an take in 5 burned out reg bulbs an get 5 CFL free, 1 month it was shampoo an personal care items etc we stocked up on CFL's for sure.
My parents are 80 yrs old have lived in the same house for almost 60 yrs I know their kitchen lights will not take these new fangled CFL lights even the florescent lights are different....it is a question as to how much longer they will be able to stay in their home I don't feel they should have to put in new lights esp since once they are gone most likely the house will be gutted an torn down.