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Views: 0 Author: Zayn Publish Time: 2022-04-14 Origin: Site
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6 The difference between UVA, UVB, and UVC rays
Solar radiation includes visible light, heat, and ultraviolet (UV) radiation. The ultraviolet radiation spectrum is divided into three regions, called UVA, UVB, and UVC.
UV radiation is divided into three categories according to its wavelength: UVA, UVB and UVC. The shorter the wavelength, the greater the energy of the radiation and the greater the harm. UV radiation has beneficial effects (such as vitamin D production), but there are also some health risks.
UVC(100nm-280nm) is the shortest wavelength of the three forms of ultraviolet light.
UVC cannot penetrate the Earth's atmosphere as UVC is completely absorbed by the ozone layer. Thus the sun's natural UVC emissions don't penetrate the skin, and actually don't even naturally penetrate the Earth's atmosphere at all. Because UVC cannot pass through the ozone layer, what we usually see is man-made UVC. UVC is harmful to the human body. When people look directly at it, it will cause ophthalmitis and if the skin is irradiated by it for a long time, it will also cause skin cancer.
UVC is mainly used for sterilization. Its principle is that the DNA of bacteria cannot be replicated, thereby inhibiting the number of bacteria.
UVB(280nm-315nm) is the second shortest wavelength. It is mostly absorbed by the ozone layer, but still passes through (about 5% overall). UVB can make the skin sunburn and redden in a short time.(below is a picture of the harm). Its benefits are the production of vitamin D, which promotes plant growth.
UVA(315nm-400nm) is the longest wavelength and penetrates the deepest, causing the vast majority (over 95%) of ultraviolet radiation to pass through Earth's atmosphere.
UV is widely used and discussed in our daily life, especially UVC. To get a better understanding of UVA, UVB and UVC, lets have a look on the below table.
Table 1 differences among UVA, UVB and UVC-suntechLED
Wave type | UVC | UVB | UVA |
Wavelength | 100-280nm | 280-315nm | 315-400nm |
Absorption level | 0% pass through the atmosphere (absorbed by the ozone layer) | 5% pass through the atmosphere | 95%pass through the atmosphere |
Penetration distance | does not reach the skin | skin surface | skin dermis |
Scope of application | Surface disinfection Water disinfection Air purification | Medical field Plant growth fill light | Lighting validating Check banknotes Nail lamps |
UVC radiation is all man-made because the sun's UVC does not pass through Earth's atmosphere. In a specific wavelength range and at a high enough dose, ultraviolet light can cause abnormal chemical bonds between adjacent pyrimidine molecules of DNA or RNA in microbial cells, which hinder the replication of DNA or RNA, thereby causing Microbial cell death. Deep ultraviolet semiconductors achieve the effect of sterilization and disinfection by emitting deep ultraviolet rays with UVC wavelengths. Artificial UVC products can be used in seriers way.
Now you have known a lot of UVC. You might curious about it whether it s bnefit or not. Let s have a look.
(1) Ultraviolet sterilization is fast and efficient. When the UV intensity is 30000μW/cm2, it can kill bacteria, viruses, mold spores, algae and fish diseases within seconds.
(2) Ultraviolet rays have an effective inactivation effect on almost all bacteria and viruses.
(3) Ultraviolet sterilization operates stably. Since the process of sterilization and detoxification is physical, it will not produce additional harmful by-products and affect human health.
9.1 The product can be widely used in sterilization and disinfection of water, air, etc.
9.2 Ultraviolet photolysis oxidation oil fume purification system is currently the most advanced photolysis oxidation oil fume purification system in China.
When exposed skin is irradiated by such UV lamps, redness, swelling, itching, and scaling may occur in mild cases. At the same time, it can cause inflammation of the conjunctiva and cornea, and long-term exposure may lead to cataracts.
The germicidal UVC LED has a single emission peak, and the emission wavelength is continuously adjustable. In terms of environmental protection and energy saving, deep ultraviolet LED materials do not contain environmentally friendly harmful substances. At the same time, deep UV LEDs can save up to 70% of energy compared to traditional UV light sources and are compliant with the EU's Restriction of Hazardous Substances (RoHS standard). Finally, the life of our company's deep ultraviolet LED has been able to reach more than 10,000 hours, exceeding the life of mercury lamps.
After knowing the differeces and function of UV-C products, you might want to purchase some UV-C products for test. Table 2 shows you UV-C products from SuntechLED.
Please click on the images in the table below to view product details.
Table 2 UV-C products from SuntechLED-suntechLED
| Wave- length(nm) | Radiant flux | Radiant flux | Dimension L*W*H(mm) |
Germicidal UVC LED Bar Module |
| 265-285nm | 15-20mw | 280*60mm |
250nm 254nm 255nm UVC Disinfection LED Module |
| 250-255nm | 300mw/m | 280*40mm |
UVC Disinfection LED Module
|
| 265-278nm | 20mw | 240*40mm |
UVC LED Bulb 265nm 275nm Germicidal Light |
| 265-278nm | 900/1350mw | 135×200mm |
Germicidal UVC LED Strip |
| 265-278nm | 90mw | / |
High Power UVC LED Chip |
| 270-280nm | 380.87 mW | 45*65mm |
Deep UVC LED Chip Diode |
| 254nm 255nm | 10mw ~ 15mw | 36*36mm |
Far UVC Led Chip Strip Light |
| 207nm 220nm 222nm | 2.5mw | 65*45mm |
Far UVC Led Light |
| 207nm 220nm 222nm | 2.5mw | 36*36mm |
Far UVC 222nm LED Tube Light
|
| 222nm | / | 28*120mm |
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UVC articles you may be interested in:
Disinfection & Sterilization Standards of UV Products Application
Frequently Asked Questions About UVC
Top 10 Things to Know Before Buying a UV Black Light LED Strip
Knowledge and application of UVC ultraviolet rays
What is UV-C
UVA VS UVB VS UVC Light
