UV Light

It is important to understand the difference between the different types of UV rays and which ones are present in indoor and outdoor tanning.

UVA- UVA light is the most prominent ray found in both sunshine and tanning beds. They have been nicknamed the "tanning rays" because they penetrate deeper into the skin than UVB rays and do not cause a sunburn effect, but instead work to deepen your skins pigment. The UVA rays can break down skin's collagen fibers and vitamin A. These elements can be fixed by using a tanning lotion with collagen enhancers and vitamin A.
UVB- UVB light is also known as the "Burning Rays" because they can lead to skin's DNA damage when overexposure occurs. The UVB rays are, however, necessary in small doses to produce a tan because they stimulate the production of melanin in the skin. Tanning beds have a very small percentage of UVB rays (about 1%), the natural sun has slightly more than most tanning beds which is why it's important to wear sunscreen when going outdoors, even if you have a base tan (Approximately 98.7% of the rays that reach Earth are UVA).
UVC- UVC light is extremely dangerous and not found in tanning beds. The rays do not reach the Earth's surface because they are absorbed by the ozone.