Are sunbeds safe? Sunbeds work by exposing the skin to ultra-violet (UV) radiation, similar to that found in sunshine. This releases a chemical called melanin, which causes the skin to tan. However, while sunlight contains a mix of UVA and UVB radiation, sunbeds produce mainly UVA radiation, which penetrates deeper into your skin. It is estimated that 20 minutes on a sunbed can be equivalent to approximately four hours in the sun. บาคาร่าสด