CFI uses way less power and generates way less heat than an
incandescent. So, they are usually perfect for that application.
The only issue would be if the glass enclosure were very small to
the point that heat could build up. But if it's like an 8" round
decorative light, no problem.
The instructions warn against it, but seems to be just fine. I have
used one in an enclosed
outdoor bell, 24/7 with no problem. I actually prefer enclosed bulbs
if they catch fire, it stays inside.
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