We started by UV-stop quartz tubes. Its surface is clear or slight blue and its cut sruface is light blue. Besides its good physical and chemical capbilities as common quartz tubes have, it also can filter out wavelength between 190-320nm, which stops the radiation to the body. It serves as the material of quartz halogen lamps, high densith discharge lamps and other UV-light, which prevent the harm to the skin of people and things which have to be inder the UV radiation. It sets out the macimun visible light at the same time.