You MUST keep the lamp filters clean. The first one, (factory install) lasted only 750 hours. I suspect it was because of the dust build up and over heating, (never did). When I replaced the lamp, the dust filters were clogged and probably contributed to the short life of the lamp.Also note, when you power down the projector, (using the remote) the cooling fan continues to run. To have it completley shut down you have to manually turn orr the power swit..