smart board 2000i.In the cost of projectors, the cost of replacing the bulb is a very important part. At present, the types of light bulbs on the market mainly include metal halide bulbs, UHE bulbs, UHP bulbs, etc. Metal halides are relatively inexpensive, but the calorific value is relatively short, generally only about 2,000 hours. UHE bulbs are widely used on the market at present, and the price is moderate. Under normal conditions, the life expectancy can reach 3,000 hours. There is also a slightly higher price UHP bulb, which has a relatively long service life of 4000-5000 hours and a relatively small degree of brightness decay. For the projector, the bulb is the main consumable in the course of its use, and the length of its life directly affects the cost of the projector. Therefore, it is not cheap to use in terms of the bulb. Considering the length of the replacement cycle, a certain cost is necessary.