Ultraviolet lamps are classified by use and pressure. In the classification by use, each product uses a different wavelength range. For example, a curing lamp needs ultraviolet of 365/420nm, which cures UV curing resin, ink and adhesives. In the classification by pressure, pressure means the pressure of the ultraviolet lamp wall. Low-pressure UV lamps generate hundreds of Torr pressure and about 40℃ wall temperature, and radiate 184.9 and 253.7nm wavelength range of ultraviolet.