What NM Is Best for Red Light Therapy?

Red light therapy (RLT) typically works within the visible red and near-infrared (NIR) spectrum of light, measured in nanometers (nm).
These wavelengths penetrate the skin at different depths and trigger various biological effects.

1️⃣ Red Light Range: 620–700 nm

• Common therapeutic wavelengths: 630 nm and 660 nm
• Penetration depth: Up to 5–10 mm (reaches skin and shallow tissues)
• Best for:
  • Skin rejuvenation
  • Collagen stimulation
  • Reducing fine lines and wrinkles
  • Healing superficial wounds or scars
  • Reducing inflammation on the skin’s surface

🔬 Why it works:
At this range, light is absorbed by cytochrome c oxidase in your cells’ mitochondria, boosting ATP (energy) production and accelerating cell repair.

2️⃣ Near-Infrared (NIR) Range: 800–900 nm

• Common therapeutic wavelengths: 810 nm, 830 nm, 850 nm, 880 nm
• Penetration depth: Up to 30–40 mm (reaches muscles, joints, and even bones)
• Best for:
  • Muscle recovery and performance
  • Joint and deep tissue pain relief
  • Nerve regeneration
  • Improving circulation and reducing inflammation

🔬 Why it works:
NIR light penetrates deeper, improving blood flow and tissue oxygenation, supporting healing from the inside out.

3️⃣ Combined Red + NIR Therapy (Dual Spectrum)

Many advanced systems (like MERICAN red light beds) use a combination of 660 nm + 850 nm LEDs — the most studied and clinically effective pair.

✅ 660 nm (red): boosts skin health and surface healing
✅ 850 nm (near-infrared): targets deeper tissues and muscles

Together, they provide comprehensive whole-body benefits, from skin rejuvenation to muscle recovery and inflammation reduction.

4️⃣ Summary Table

✅ In Short

The best wavelengths for red light therapy are 660 nm and 850 nm, often used together for maximum skin and body benefits.