UVA VS UVB VS UVC Light

Aug 18, 2021

UV Light rerefers to ultraviolet light which cosists of UVA, UVB and UVC. You may have a question, what is the difference between UVA , UVB and UVC rays?

Different wavelength UVA VS UVB VS UVC

UVA: from 320nm to 400nm

UVB: from 290nm to 320nm

UVC: from 200nm to 280nm

UVA application,

UV curing lamps for  cure adhesives, coatings, inks, varnishes, decorative glazes and lacquers.

UV lamps also are used for tanning and backlighting.

Products UV LED strip, UV LED strip light

Different degrees of damage to the skin

While UVB radiation is widely recognized for its harmful effects on human skin and links to skin cancer, each of the UV bands (UVA, UVB and UVC) create different risks for humans. 

UVA is harmful to skin, UVB is risk to skin cancer, UVC can cause serious damage to skin, but we can not be touched by natural ultraviolet light, only by artificial ultraviolet light please see picture below:

Knowledge about UVC:

UVC radiation refers to wavelengths shorter than 280 nm. These wavelengths are entirely absorbed by our atmosphere and no natural UVC radiation reaches the surface of the earth.

These wavelengths are available to us through artificial sources, such as UVC LEDs or mercury lamps. The intensity from point sources like UVC LED falls off as 1 over distance squared, and once it gets past the scattering length, it falls off exponentially.

This means that: 

1) the further away the UVC source from a human, the lesser dose he is exposed to, and

2) the absorption length of UVC radiation in human skin is extremely short so that almost no UVC radiation can reach the living cells in the skin; all the absorption occurs in the dead cell layers.

UVC Effect on Skin

Acute (short-term) effects include redness or ulceration of the skin. At high levels of exposure, these burns can be serious. For chronic (long-term) exposures, there is also a cumulative risk, which depends on the amount of exposure during your lifetime. The long-term risk for large cumulative exposure includes premature aging of the skin and skin cancer.

UVC can damage the skin cell's DNA structure ,rendering them incapable of reproduction

With deep ultraviolet LED UVC technology development, now we have SMD3535 UVC LED chip that can supply this particular wavelength.

UVC LED Application such as water disinfection, air sterilizer , air purification， surface disinfection.

Mostly used for Active water or air, not static water nor air. 

UVC LED application:

Disinfection water, destroying harmful micro-organisms in other liquids, on surfaces, on food products and in 'air'.  

Products such as UVC LED strip, UVC LED rigid bar light, UVC LED lamp 

Regarding UVC LED chip: