OK, now ceiling fan bulbs have another issue. Heat rises, and it heats the base of the bulb. Many of the good ceiling fan bulbs have a brass base and the cement is more heat resistant than standard bulbs. The Brass base handles the extra heat much better than aluminum.
The ones now in there have aluminum base and I replaced one yesterday and now see another one is out. I put these all in at once and it appears they are going out within days of each other. This is why I have to have lots of these bulbs. Maybe the new GE ones have a bass bottom since it says they last 2 and 1/2 times longer than others.