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Classifications of Sunlight

What is UV?

UV: Ultraviolet is a broad wave emitted by the sun. 

UV includesUVA UVB and UVC, from 

100 micron to 400 micron. 


UVA refers to ultraviolet A with a 

wavelength of 315 ~ 340nm.

UVB refers to ultraviolet B with a 

wavelength of 280 ~ 320nm.

UVC refers to ultraviolet C with a wavelength of 200 ~ 280nm.

Why do we need to protect ourselves from UV?

UV Harmfulness

Excessive UV can damage skin, eyes and immune system. 

 Your skin may getsunburned, photo aged or darker. It will also cause skincancer, 

melanoma, lupus erythematosus and freckle.

UPF VS UV Harmfulness

The higher index the better protection effect. 

Different UV levelsrequire different levels of UPF protection.

Influence Factors of UV


InfluenceFactors of UV


Influence Factors ofUV UV index is mainly composed of UVA andUVB. UVB is moresignificantly weakenedby the atmosphere.


The influence factorsof UV index mainlyinclude direct sun Angle,latitude, altitude, clouds,ozone layer and groundradiation.

The sunlight is not balancedaround the world

For every 300 meters of higher elevation, UV index increases 4%. When completely covered by cloudsor fog, UV will be weakened by more than 50%. When the UV index is the highest in summer, it is usually inJuly or August in the northern hemisphere and January or February in the southern hemisphere. 

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