Yes, I've hear that .... and I'm not concerned. I have far too many restaurant customers using CFL's in their base-up totally enclosed cooking hood lights to accept that 'base up' is a problem.

Why do they use CFL's? Because they - even with the ones that die within a month - last a lot longer than incandescents in the same application .... and they're comparing the CFL's to 'rough duty' incandescents!