> One major possible selling point- fluorescent bulbs can trigger
> migraine headaches in some people, under some circumstances.
> Many of those people might well be willing to pay a premium to
> save energy, but cannot use CFL products.

I am not really sure why these cause people a problem. I could understand it 
with standard fluorescent lamps, which do distinctly flicker at 100 or 120 
Hz (depending on mains frequency) but CFL lamps, especially low energy ones, 
are all running on DC, or much higher frequency AC, to a point where I 
wonder if the phosphor can keep up with the flicker frequency. Hence the 
actual flicker must be very small. 

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