Though they don't delve as deep into the skin's layers as UVA's, UVB's can damage the DNA at the heart of skin cells, and are a main cause of skin cancer. Never be fooled by cloudy skies. And don t believe that just because you re in the water you re safe against the UV rays. Unfortunately, people have the false belief that tanning beds are safe. For while it was believed that the UV rays emitted from tanning beds were not harmful because the sunlamps only gave off UVA and little, if any, UVB rays.
Sunlamps used in homes are the same.
It can be a confusing thing buying sunscreen. Look at the SPF for starters. If you begin to tan or burn after 10 minutes, an SPF of 15 extends your protection 15 times longer. This is very wrong especially for children. Everyone should use sunscreen 15-30 minutes before they go outside in order for the sunscreen to take affect.