As I said in an earlier post, I have a dome lamp where I'm tempted to try them. The bulb would be completely enclosed. Any idea how badly the life expectancy is degraded?
If it's just a durability issue and not a safety issue, I suppose I can take a flyer on three bulbs and see how they work out.
I believe it is a durability and not a safety issue, although at http://sound.westhost.com/articles/incandescent.htm the author speculated about a small risk of "explosive" failure, especially if they get wet.