UV lamp is consisted of pure quartz with high quality, which can make the UV to transmit with a large quantity. The part of the lamp neck at both end of tube is made of thin molebdenum plate sealed in vacuum. The electrodes are made of pure tungsten noodle twisted and coated with thorium-tengsten. This kind of design can help the lamp tube to light advantageously, in which the inert gas has been filled under vacuum. The filling process is always supervised and controlled seriously to ensure the pressure and Hg content in lamp tube to be correct. At last, the metal lamp head or ceramic head with down-lead and wire terminals is fitted on the sealed tube.