LCD and DLP projectors typically have a lamp life between 2000-4000 hours. This specification is actually referring to the 'half-life' of the lamp. The half-life is the point where the lamp is half as bright as it was new. The lamp will still work at its half-life, but it will continue to gradually lose brightness. Longer lamp life means less expense in maintaining your projector. If you are planning to use your projector to replace your current television, lamp replacement cost should be factored into your purchase. Replacement lamps run approximately $200-$400.