Three leading causes of short tungsten lamp life are high voltage, excessive shock / vibration, and high heat.
Is the fixture on a light dimmer? Turning down the voltage even 10% can double lamp life.
Is there alot of pounding, dancing, or jumping up and down directly above the fixture? Excess bass thumping? All of these can shorten the bulb life.
Are there covers or add on shades that can trap the lamp heat? Are you using the lamps in the correct orientation? Some bulbs require burn base up or burn base down.
Are you using photgraphic bulbs. Many of the special light color lamps only have a limited life of 50 or 100 hours.
Edited by LarryC (02/06/12 12:22 PM)