I posted a link to a report about "dirty electricity" caused by CFL bulbs...and will try to find the link to post here..

An electrician recently installed a reostat (dimmer switch) but cautioned that floursecent bulbs could not be used with it, but that
incandescent bulbs were needed in that fixture.

the magnetic fields produced by "dirty electricity" can have negative health effects...on diabetics, MS patients , Asthmatics,, and others.
"high frequency transients" are what these electrical "spikes"
are called

http://www.magdahavas.com/wordpress/wp-content/uploads/2010/03/08_Havas_Diabetes_EBM.pdf

Swiss health officials are recommending that people stay at least 30 centimetres away from energy-saving light bulbs, over electrosmog concerns.

*Study warns of green light bulb 'Electrosmog'* http://www.swissinfo.ch/eng/swiss_news/Study_warns_of_green_light_bulb_electrosmog_.html?cid=8584642

LED bulbs are said to be better.