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How are blue, red and infra-red wave lengths use to treat different types of problems?

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How are blue, red and infra-red wave lengths use to treat different types of problems?

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Light is a form of energy that is familiar to us. However, the part of light that is visible to us is only about 10% of this spectrum of energy. The full range extends from ultra-violet (invisible), through all the colors of visible light into infra-red (invisible). Ultra-violet light has a very short wave length (370-390nanometers), is highly energetic yet only penetrated a small distance into the skin (because this wave length is greatly absorbed by hemoglobin). This is why UV light causes sun burns on the skin but does not result in damage to deeper tissues or organs. In contrast, infra-red light (700-1300 nanometers) penetrates deeply into tissue, up to 25 cm. (12 inches) but does not possess very significant energy compared to uv light. Beyond this range water absorbs significant energy and limits the penetration of energy at the middle and far IR wavelengths. The band between 650-1300nm is called the optical or therapeutic window and the next generation of photosensitizer which h

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