Full close streamline lamp body design completely meets the demand of the sterilization and high standard of laminar flow purification in the operation room. The lamp-chimney is made of aluminum alloy, ultrathin and streamlined shape reduces the air drag, the thickest part of lamp-chimney is not more than 18cm. Curve and slippy surface prevents deposition of dust very well, convenient for purified air reaching the surgery surface of wound smoothly