850nm is a wavelength of light that lies in the near-infrared spectral range (800nm~1500nm), and this band of light is invisible to the human eye. So you can't see with your naked eye whether the 850nm LED strip or light is working or not. But you can see the 850nm LED light beads emitting a faint pinkish reddish dimming light under the cell phone camera and other devices.
The 850nm near infrared light waves have significant applications in the field of phototherapy. 850nm red light therapy penetrates deep into the skin and is absorbed by the water, proteins and pigments in the tissues to generate heat energy. This heat energy stimulates circulation, increases cellular activity, and acts as an inhibitor of inflammation and pathological tissue.
660nm vs 850nm
660nm belongs to visible light, the color is deep red; while 850nm belongs to invisible light, which can only be seen under the camera equipment. 850nm wavelength is more powerful than 660nm wavelength to penetrate the tissue, and able to reach the deeper tissues of the body. Therefore, 660nm wavelength light is commonly used for surface skin problems and cosmetic issues, while 850nm wavelength light is more suitable for deeper tissue treatments.
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