I live in Ohio, so it's cold part of the year and I just asked my husband if he noticed the same thing I did. The swirly bulbs, when used in an outdoors fixture, take quite a bit longer to reach their full light potential. He's going to the store today, so we both agreed he should pick up a stash of the old type
We didn't know about using it for 30 min the first time, will do that now too