The difference between the ultraviolet germicidal lamp and the ordinary fluorescent lamp is that the germicidal lamp does not need to convert the excited ultraviolet rays into visible light. The ultraviolet rays with the wavelength of 253.7nm can play a good sterilization effect. The absorption spectrum of light waves by cells is regular. Cells have the largest absorption of ultraviolet light with a wavelength of 250 to 270 nm. So what is the effect of the ultraviolet light absorbed by the cells on the cells?
It can act on the genetic material of the cell, namely DNA, which will act as a kind of actinic effect on the cell. The energy of ultraviolet photons is absorbed by the base pairs in the DNA of the cell, which will cause the genetic material in the cell to occur. A big variation, this is the same as the cells become cancerous when a person is irradiated with X-rays. Ultraviolet radiation will cause the bacteria to die immediately or unable to reproduce their offspring. Under such an effect, the purpose of sterilization can be achieved. The uv light sanitizer box is the UV disinfection lamp used.
Although the principle of the ultraviolet germicidal lamp is the same as that of fluorescent lamps and energy-saving lamps, the materials used are different. The ordinary glass used in ordinary fluorescent lamps, but such materials cannot make the 253.7nm ultraviolet light penetrate, so UV germicidal lamps cannot use ordinary glass.
So what material should be used to make the most of the ultraviolet light, that is, quartz glass. This material has a very high ultraviolet transmittance, which can reach 90%. Therefore, quartz glass is the best material for germicidal lamps. The performance and thermal expansion coefficient are very different from ordinary glass. Therefore, the sealing of ultraviolet germicidal lamps cannot use the highly automated round sealing method used in the manufacture of ordinary fluorescent lamps. It is necessary to use technology with high production and manufacturing technology. The price of UV germicidal lamps on the market is higher than that of ordinary energy-saving lamps.