What lights give good spectra?

Right now, my house is lit mostly by CFLs, and some incandescent bulbs. Especially with the CFLs, but also with the incandescent lights, the quality of portraits -- even with a gray card -- is abysmal. I'd like to swap out for something that will give more natural skin colors. I do not have room in my house for dedicated photography lights (e.g. something on a tripod with an umbrella is out).

Things I'd like (by decreasing importance):

1. Rich spectrum for natural-looking photographs (requirement)
2. Low power consumption (very strong desire; heat is an issue)
3. Fits existing lightbulb sockets, as opposed to e.g. an LED strip to mound on my wall (nice-to-have). 
4. Reasonable cost (nice-to-have)

Right now, the room where I most commonly shoot has two CFLs on the ceiling, and a standing/mobile light with 5 CFLs (all at 60-100W equivalent).

Any suggestions on what I should buy to give good (or at least somewhat better) lighting?

(I had posted this in the open forum, but got no responses).