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    What is different 660nm and 850nm ?
    In the comprehensive meta-anaylsis on light therapy titled The Nuts and Bolts of Low-level Laser (Light) Therapy (21), the researchers stated:
    The wavelengths of light used for (light therapy) fall into an ¡°optical window¡± at red and NIR wavelengths (600¨C1070 nm). Effective tissue penetration is maximized in this range, as the principal tissue chromophores (hemoglobin and melanin) have high absorption bands at wavelengths shorter than 600 nm.
    Wavelengths in the range 600¨C700 nm are used to treat superficial tissue, and longer wavelengths in the range 780¨C950 nm, which penetrate further, are used to treat deeper-seated tissues.
    Wavelengths in the range 700¨C770 nm have been found to have limited biochemical activity and are therefore not used.
    If you are trying to chose a device with the 'best bang for your buck', you may want to find something that has minimal energy going to 700-770nm light. For example, the Red Light Man half body panelshave power equally split between 620nm, 670nm, 760nm and 830nm wavelengths. Though all ranges are within the 'optical window', the 760nm light may be wasted when it comes to health benefits according to this report.

    SGROW LED only emits two wavelengths - 660nm and 850nm Sure this is less variety, but at least you know that all the light being emitted is well utilised by the body (and both the mid 600 and mid 800nm wavelengths have a lot of evidence behind their effectiveness)
    Whats the difference between 660nm and 850nm?
    In simple terms, the 660nm light is absorbed faster by the skin, useful for those who want to reduce wrinkles, boost collagen, and reduce scars and stretch marks.
    The 850nm light goes deeper into the body, helping with inflammation and joint pain and muscle and organ recovery and health.

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