In the past a long time, people’s awareness of UV is vague,Dangerous, even harmful. Even the sunlight is dangerous to them!They does not know that there is a beneficial side of ultraviolet radiation on the human body. can help bone growth
First, Medium wave of ultraviolet radiation,can make the deoxy cholesterol into vitamin D in skin. vitamin D enhances the absorption of calcium and phosphorus in the body,growth of children More contact with sun,more activities on outdoors.help prevent rickets.Recently, office’workers in the incidence of rickets has increased, the reason is * closed working environment
*they’s almost con’t touch the sun All day.

Secondly, different wavelength UV-A, UV-B ultraviolet radiation can treat rheumatoid arthritis, lupus, psoriasis, scleroderma, vitiligo, pityriasis rosea and cutaneous T cell lymphoma and skin diseases. But studies suggest a link to  lupus erythematosus shows that patients treated with ultraviolet radiation can significantly reduce the symptoms. and with the extension of treatment time, the effectiveness of the treatment continues to increase.

Again, UV Can also make the microbial cell nucleic acid and protein puree chemical change, to kill microorganisms, uv led strip were conducting an
Sterilization on air, water and polluted surface.

In summary, the three bands of A, B and C have a qualitative damage to the surface of the biological. The most effective band of the three bands is C band, and the wavelength is 253nm. The bactericidal activity of 7Nm was the strongest.