And then I discovered that the GE halogen / CFL hybrid 60 watt bulb was selling for about $2 / bulb after the built-in ComEd rebate. So I figured I'd try a pair of those in the basement stairwell.
As promised, they do produce a good bit of light fairly quickly from the halogen until the CFL gets warmed up. So they seem to be ok, although I don't know if I'd necessarily trust them in the studio.
But for this application, they'll do.