[scottbombedout]

What I normally find with ordinary lamps is they last longer if they are pointing upwards. The heat dissipates from them better and they overheat quicker pointing downwards.

Perhaps the oscillating fan is causing them to move, they will blow quicker if they are receiving a jolt. Maybe the fan needs balancing?

A good dimmer should improve the life of the lamp. We always use soft start dimmers that bring the lamp up slowly.

And the number one bain of my life is cheap lamps. The older ones had inline fused caps. When the lamps blew the circuit breakers didnt trip.