UVA light, also known as long-wave light, accounts for about 95% of the UV light that reaches our skin.
Although both UVA and UVB are bad for skin, UVA rays are more of a threat because a much larger percentage of them reach earth’s surface.
UVA light has a wavelength of 320 nm to 400 nm.
Is UVA more dangerous than UVB?
The rays that are most damaging to our skin are called ultraviolet (UV) rays. In addition, the UVA rays penetrate more deeply into the skin and play a greater role in premature skin aging changes including wrinkle formation (photoaging). There are approximately 500 times more UVA rays in sunlight than UVB rays.
Does UVA or UVB cause cancer?
Most tanning beds give off large amounts of UVA, which has been found to increase skin cancer risk. UVB rays have slightly more energy than UVA rays. They can damage skin cells’ DNA directly, and are the main rays that cause sunburns. They are also thought to cause most skin cancers.
What is the difference between UVA and UVB?
UVA rays penetrate deep into the dermis, the skin’s thickest layer. Unprotected exposure can lead to premature skin aging and wrinkling (photoaging), and suppression of the immune system. UVB rays will usually burn the superficial layers of your skin. It plays a key role in the development of skin cancer.
Why is UV more dangerous than IR?
In terms of wavelength, ultraviolet radiation has shorter wavelengths than visible radiation, which have shorter wavelengths than infrared. Of more importance to us, ultraviolet photons have enough energy to damage or destroy DNA, visible and infrared photons do not.