IT is obvious to say the Compact Florescent replacement lamps (CFLs) can save energy and they will pay for themselves many times over by comparison to powering an incandescent bulb.
I personally use them in my home and office. I am however not convinced that I am doing the right thing for the power system.
Consider an older home (or office); the electrical system (breakers, transformers, etc.) were engineered for mostly “traditional” linear loads. An example of a linear load is a resistive load as in incandescent lights, AC Motors and electric heaters.