Quote Originally Posted by Xiahou
Good ideas, RH. I'd known they saved energy, but never did the math on it. The heat levels in my claustrophobic PC room is something I can definitely relate to.

Do they, by chance, make 2 or 3 stage spirals?
I'm pretty sure I've seen some 3 ways. The top setting for 3 ways is like 150 Watts if memory serves (for a standard incandescent.) As you go up in voltage on the spiral compact fluorescents, the length and radius of the spiral tube gets larger. The 60 W equivalents were rather small, the 100's are about the same size as a standard bulb (but with the spiral sticking out maybe 1/4" farther on the ends) but the 150's were fairly large. I suppose they get a given luminescense per inch of spiral length, which requires finding ways to squeeze more tube length in a given geometry (increase radius, and/or numbers of turns.)