What type of UV light is used during tanning beds and why is it so dangerous?

It is an ultra violet light, same as the sun. If you spend a lot of time in the sun, you are more likely to get skin cancer, it's the same for tanning beds.

Tanning beds use UVA light.

The concentration of UVA rays from tanning beds is greater than from the Sun.

UVA light is dangerous because it penetrates multiple layers of the skin.

Some tanning beds also emit UVB light.

Exposure to UV light in tanning beds can age skin and greatly increase the risk of skin cancer.