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How safe are sun beds? UV light is radiation that can't be seen and is beyond the violet end of the visible spectrum making UV an ionizing radiation. Ionizing radiation is high in energy and can damage living cells, causing skin cancers and diseases. The sun... The sun is the source of energy that all life on earth depends on, without the sun the earth would be unable to survive. The sun radiates elector-magnetic vibrations with different wave lengths. Wave lengths of heat rays are longer than the wave lengths for visible light. Ultraviolet radiation which tans our skin has even shorter than these. The sun can be good for you because; * Ultraviolet (UV) radiation from the sun is our main source of vitamin D, important for your bones, muscles and immune system * Vitamin D may also have the ability to combat the development and spread of cancerous tumours *...

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