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Projector lamps need to be kept in a dry, cool, dust free environment to maximize lamp life and minimize operating cost. A common trick is to leave your well-circulated fan on after use until the projector is cool. Do not obstruct airflow or you can burn out your lamp, or even worse. Lamp brightness is essential to picture quality, so it is extremely important to maintain your bulbs and refer to your projector guide to determine the lamp life expectancy. As a lamp nears its end, dimming may occur. There two common projector lamp types: Metal Halide Lamp, and the Halogen Bulb, each with their positive and negative qualities. The Metal Halide Lamp is superior and used for medium to high-end projectors. One downfall are that these lamps lose brightness after use, where Halogen Bulb’s maintain their brightness while only lasting 40 to 70 hours compared to Metal Halide at 1,000 to 2,000 hours. Some of these lamps are being advertised at 4,000 hours. Halogen Lamps are yellow compared to the Whites that make Metal Halide a superior technology. Metal Halide lamps range up to $500, and Halogen ranges to about $100.