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What is the difference between ultraviolet germicidal lamp and ordinary fluorescent lamp?

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, and the wavelength of 253.7nm ultraviolet rays can play a good sterilization effect. The absorption spectrum of light waves by cells is regular. Cells have a large 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, which is DNA, which will have 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 be greatly changed. The mutation of this is the same as that when a person is irradiated with X-rays, the cells will become cancerous. Ultraviolet radiation will cause the bacteria to die immediately or fail to reproduce their offspring. Under such an effect, the purpose of sterilization can be achieved.

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 ultraviolet rays Ordinary glass cannot be used for germicidal lamps. So what material should be used to make the ultraviolet light transmit more? That is quartz glass. This material has a very high ultraviolet transmittance, which can reach 90%. Therefore, quartz glass is a material for germicidal lamps. Due to the performance of quartz glass and The coefficient of thermal expansion is 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 high-tech manufacturing technology, so it is available on the market. The price of UV germicidal lamps is higher than that of ordinary energy-saving lamps.