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Bulbs burning out prematurely can be caused by various things. Most of them have already been hit on. Just a bad bulb, doubt this with as often as you're replacing them. Overheating, check any air filters and make sure there is sufficient ventilation the TV/projector. Excessive power cycling, the bulb should be allowed to fully cool down before it is turned back on. Remember that the bulb continues to cool for a few minutes after the fan shuts off. Contaminated bulb; oils from you fingers while installing the bulb, grease being pulled in from a nearby kitchen, smoke from a fireplace, etc. will severely shorten a bulbs lifespan.
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A clear conscience is usually the sign of a bad memory.
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