Bactericidal lamp is actually belongs to a low pressure mercury lamp. Low pressure mercury lamp is the use of low mercury vapor pressure (<10-2Pa) was intensified and emit ultraviolet light, the emission spectral line there are two: one is the wavelength of 253.7nm; the other one is 185nm wavelength, the two are invisible to the naked eye ultraviolet.
For fluorescent lamps, lighting energy-saving lamps also belongs to the low pressure mercury lamp, rely on the low-pressure mercury vapor is emitted ultraviolet, where 254nm wavelength ultraviolet irradiates the fluorescent powder to emit visible light, if the component and proportion change of fluorescent powder, it can issue we often see different colors of light.
Germicidal lamp does not need to be converted into visible light wavelength, 253.7nm can play a bactericidal effect is very good, this is because the cells have a law on the absorption spectrum of light, has the largest ultraviolet absorption at 250~270nm, the absorbed UV actually interact with the cells' genetic material is DNA, and it plays a photochemical effect, ultraviolet photon energy is DNA in the base of absorption, cause genetic variation, the bacteria died immediately or can't breed, achieve antiseptic goal.
The use of fluorescent lamps and energy-saving lamps made of ordinary glass, 253.7nm UV penetration does not come out, do not use germicidal lamp, quartz glass up to 90% of UV transmittance, high, is the best material to do germicidal lamp, but the performance of quartz glass and ordinary glass has the very big difference in performance (mainly is different coefficient of thermal expansion), round seal to seal can not use ordinary higher degree of automation, which makes the technical content of germicidal lamp manufacturing should be higher than the ordinary energy-saving lamps.
There is a glass for ultraviolet rays, namely high boron glass usually say, it on the UV transmittance is about quartz glass 60%, its production technology and energy-saving lamps, the price and cost of it than the germicidal lamp quartz glass tube production of a few watts far, just a few yuan, but its performance is far less than the quartz lamp. Manifested in the following aspects:
1, the transmittance is different, in the same specifications as ballast test intensity of ultraviolet germicidal lamp, quartz glass is more than 1.5 times of high boron glass germicidal lamp;
2, the high boron glass lamp UV intensity is easy to decay, it lighting hundreds of hours after the UV light intensity on the decline, down to the initial 50%-70%. In the hands of users, although see the lamp still bright, but it may have no effect. The quartz glass optical attenuation is much less than the high boron lamp, if the production process of clearance, attenuation quartz lamp light in the light of 2000-3000 hours, light attenuation to initial 80%-70%, as long as the light does not destroy, decay rate will be more and more small.
The germicidal lamp customers may know germicidal lamp Philip, Philip has a bactericidal lamp is used in the production of a glass closer to ordinary glass, rather than a quartz glass manufacturing, the transmission rate is close to the quartz glass transmittance, much higher than the high boron glass lamp China, production process of energy-saving lamp production the use of a higher degree of automation, the lamp is mainly rely on their refining the glass technology. It can't produce ozone.
Another feature of quartz sterilizing lamp can be emitted ozone. Since ultraviolet quartz glass for HF 185nm transmission rate is high, the 185nm ultraviolet ray ionizing air to produce ozone, ozone concentration is disadvantageous to the human body, but can be used in an occasion, ozone can sterilization, disinfection, just can make up for the ultraviolet disinfection only travels in a straight line, have a corner defect.
In some cases no ozone, can also use the quartz lamp, the quartz glass added an element of titanium in the refining time (Ti), make it happen on 200nm following ultraviolet, while the 254nm ultraviolet light through the basic no effect, that is to say, no ozone sterilization lamp.
From the above analysis, do the germicidal lamp quartz glass is the best choice. In China, the medical and health field, already do not recommend the use of the high boron germicidal lamp, in the United States, Canada, Japan produced ultraviolet germicidal lamp is generally made of quartz glass.
However, with a germicidal lamp quartz glass production also not necessarily can do good, because we need to solve two major problems.
1, higher cost
Already mentioned before, because of the special nature of quartz glass, so that the production can not scale quartz germicidal lamp, mechanized production, but only to manual production, the high cost of quartz lamp. Ultraviolet germicidal lamp domestic manufacturers of dozens of yuan, imported Chinese to hundreds of yuan even hundreds of yuan. The price is high, it hinders the further application.
2, the larger lumen
Quartz lamp may also appear a problem is not long life. Life is not long there are two concepts: one is the operating life is not long, the point is not the long time, the lights went out, this is mainly the electrode processes is not good. In quartz processing, with high temperature, if handled improperly, will cause the cathode damage, little time off; the second refers to the concept of effective life, even if the lamp is not put out, but the intensity of UV light it decreases fast, reached 30%, according to the provisions of the industry standard YY/T0160-94, so light is dead. YY/T0160-94 provides effective life of quartz lamp must be greater than 1000 hours, and the United States, Japan lamp about standard germicidal lamp should be more than 9000 hours. Obviously the quality level of ultraviolet germicidal lamp in China than foreign much lower.
According to this situation, began to ultraviolet low pressure mercury organizational strength of high strength, long life in early 2000 (colloquially known method called germicidal lamp) after more than a year of efforts, we overcame this problem, and in the following two aspects we determined the advantage.
One, cost the current domestic production of quartz lamp manufacturers mainly by hand, especially the main procedure of sealing by hand, making the product cost is generally higher, the consistency of the product is poor, it is difficult to guarantee the reliability. Prone to the problem of chronic leakage, the main reason of chronic air leak is quartz and the electrode seal is not good. Huaxing automatic sealing method, production efficiency and greatly increase the finished product rate, leakage of <0.5%, the reliability is greatly improved, and the unit cost than peers significantly reduced, the price is very competitive.
Quartz lamp two, effective life of manufacturers of the lighting point hour is no problem, but a lot of the time did not put out the lamp can not be used, such as hospital 30 tile quartz disinfection lamp, initial in general there are 100 μ W/cm2 (1 meters) after used for a period of time (about 1500 hours), by ultraviolet probe (1 meters) below 70 μ W/cm2, the tube must be replaced, so as to avoid the disinfection effect is not good.
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