A sunless tanning booth and a tanning bed both achieve the same result. It's just a matter of whether you prefer to lie down or stand up during your tanning session. Melanin is a skin pigment produced by melanocytes in the upper layer of the skin. During your tanning session, the ultraviolet B (UVB) light emitted by the tanning lamps stimulates the melanocytes in your skin to produce melanin. The ultraviolet A (UVA) light emitted by the tanning bed lamps then darkens the melanin giving your skin a tanned or dark appearance. The top layer of skin cells eventually slough off as the new skin cells migrate to the surface. This results in the tan fading. Once you have established a good base tan, you can visit a sunless tanning booth or bed one or two times a week to maintain your tan.