So... throwing caution to the wind, I accidentally left a CFL bulb (Feit 23w spiral, 100w equivalent, available all over in California for $0.25 due to PG&E credits) on overnight in an enclosed, recessed ceiling fixture. This morning I tentatively touched the glass cover plate... a little warm, not hot. I opened it up, felt around inside, the reflector and casing are only warm. I grab the bulb itself by the ballast and by the spiral itself... warmer, but not too hot to hold.
I know from experience that these fixtures (unvented metal boxes) get VERY hot with a standard 75w incandescent bulb. Can I conclude from these observations that the CF bulbs are fine? What sort of reduction in life should I expect from what seems like a very modest increase in operating temperature?