Penetration depth is critically important because wavelength determines how far light penetrates: blue wavelengths penetrate the least, red wavelengths penetrate a moderate depth, and near-infrared wavelengths penetrate the deepest (approximately 4 centimeters). The "sweet spot" must match the wavelength to the target tissue depth to achieve optimal biological effect.
causalpending
Evidence Quote
“penetration remember earlier when we discussed different wavelengths such as blue red near infrared and how the wavelength was the most important factor in penetration with blue being the least penetrating and near-infrared being the most penetrating... we need to find The Sweet Spot how much energy is needed per wavelength to reach the appropriate depth”
Created: 8/13/2026, 7:47:20 AM
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