Red light therapy and infrared therapy are often mentioned together in the world of wellness, skincare, and pain relief — and for good reason. They both use light energy to stimulate healing and regeneration in the body. But are they the same thing?
Let’s break it down.
What Is Red Light Therapy?
Red light therapy (RLT) uses visible red light wavelengths, typically between 620nm and 660nm. These wavelengths penetrate the skin to a shallow depth — around 8 to 10 millimeters — and are known to:
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Stimulate collagen production
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Improve skin tone and texture
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Promote wound healing
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Reduce inflammation on the skin’s surface
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Aid in hair growth
Because red light is visible to the human eye, RLT often gives off a soft, warm red glow.
What Is Infrared Therapy?
Infrared therapy uses invisible light, specifically near-infrared (NIR) wavelengths, typically between 700nm and 1100nm. These wavelengths penetrate much deeper into the body — up to 5 centimeters (about 2 inches) — reaching muscles, joints, and even bones.
Infrared therapy is commonly used to:
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Relieve joint and muscle pain
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Enhance circulation and oxygenation
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Reduce deep inflammation
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Support nerve regeneration and repair
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Improve recovery after workouts or injury
Since NIR light is invisible, these devices won’t appear to glow as brightly as red light therapy panels, though they may still emit some warmth.
Key Differences Between Red and Infrared Therapy
| Feature | Red Light Therapy | Infrared Therapy |
|---|---|---|
| Wavelength | 620–660nm | 700–1100nm |
| Visibility | Visible (red glow) | Invisible |
| Penetration Depth | ~10 mm (skin level) | Up to 50 mm (muscle, joint, bone) |
| Primary Uses | Skin health, anti-aging, hair growth | Pain relief, muscle recovery, deep tissue healing |
| Sensation | Warm, glowing | Often no visible light, deeper warmth |
Can They Be Used Together?
Yes — and they often are.
Many modern red light therapy devices combine red and near-infrared wavelengths for maximum therapeutic benefit. This dual-wavelength approach allows the treatment of both surface-level and deep tissue issues in one session.
For example:
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660nm red light can boost collagen for skin rejuvenation
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850nm near-infrared light can reduce joint pain and inflammation deeper in the body
This combination is especially popular in full-body therapy beds and panels.
Final Thoughts
Red light therapy and infrared therapy are not exactly the same — but they’re closely related and often work best together. Red light targets surface skin concerns, while infrared goes deeper to relieve pain and support recovery. Whether you’re aiming for younger-looking skin or relief from sore muscles, understanding the difference helps you choose the right device — or combination — for your wellness goals.