How Deep Does Red/NIR Light Penetrate Into Our Body? The answer to this question is actually much more complex than you might imagine… The penetration depth differs depending on many factors: The type of tissues (e.g. skin vs. bone vs. fat vs. muscle). First, it depends on exactly what part of your body you shine it on. It will penetrate much more deeply into your belly than your skull. The power output of the device. More powerful lights can deliver more light to deeper tissues of the body. The distance of the device from your body. As explained previously, the closer the light is to your
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