light therapy, Phototherapy or laser therapy. Electromagnetic spectrum with colors of the various wavelengths in the human skin. Different light spectrums would penetrate the skin to different depths. Depth of penetration by wave light

light therapy, Phototherapy or laser therapy. Electromagnetic spectrum with colors of the various wavelengths in the human skin. Different light spectrums would penetrate the skin to different depths. Depth of penetration by wave light - 69725355

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