I purchased two of these bulbs from a local Hardware store to use for a photo booth setup. They were screwed into large open aluminum reflector clip-on lamps. One seems to work fine. One stopped working after about 3 hours when I wasn't in the room. I removed it, checked the contacts in the lamp, left it for a day, and when I returned, it worked just fine. For about 10 minutes. This time, there was an audible sizzle and a definite odor when it failed.
I exchanged it for a second one, which went "pop" and died after about 15 minutes.
There are some simple guidelines but no real warnings on the package about where NOT to use it, so I think it should have worked fine in an open fixture.
It is really too bad, because the light output is bright and clean.
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