Is Red Light Therapy the Same as Infrared? Understanding the Difference
Consumers often ask: “Is red light therapy same as infrared?” or “Is infrared red light therapy?” While the two are closely related and often used together, they are not exactly the same. Understanding their differences can help you choose the right device or treatment for your goals.
What Is Red Light Therapy?
Red light therapy (RLT) uses wavelengths in the visible red spectrum, typically ranging from 620 to 700 nanometers (nm). These wavelengths penetrate just below the surface of the skin and are commonly used for:
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Skin rejuvenation
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Collagen support
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Reducing temporary inflammation
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Improving overall appearance of the skin
Because red light is visible to the eye, you’ll see a bright red glow during treatment.
What Is Infrared (IR) Light?
Infrared light—specifically near-infrared (NIR)—falls just beyond the visible spectrum at around 700 to 850nm. Unlike red light, infrared is invisible to the human eye.
NIR wavelengths penetrate deeper into the body, reaching muscles and joints. Infrared light is commonly used to temporarily:
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Promote relaxation
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Support circulation
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Ease minor joint and muscle stiffness
Is Red Light Therapy the Same as Infrared?
No — but they are closely related.
| Feature | Red Light Therapy (Visible Red) | Infrared Therapy (Near-Infrared) |
|---|---|---|
| Wavelength Range | 620–700nm | 700–850nm |
| Visible to the Eye | ✅ Yes | ❌ No |
| Depth of Penetration | Shallow (Skin-depth) | Deeper (Muscles & Joints) |
| Common Uses | Skin appearance & surface-level | Muscle/joint comfort & recovery |
Is Infrared Red Light Therapy?
Infrared can be part of a red light therapy device, but only if the device includes both visible red and near-infrared LEDs. Some products are marketed as "red light therapy" but only use infrared — which can confuse buyers.
The best practice is to look for published wavelength specifications (e.g., 660nm + 850nm). That tells you whether the device offers true dual red and infrared coverage.
Should You Choose Red or Infrared?
It depends on your goals:
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For skin appearance and surface-level support → Red light
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For deeper muscle or joint comfort → Near-Infrared (NIR)
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For overall wellness coverage → Combination devices with both wavelengths are becoming the most popular.
Final Answer
Red light therapy and infrared therapy are not exactly the same — but they are complimentary. Red targets the skin’s surface, while infrared reaches deeper. Many modern devices combine both to deliver broader coverage.
References & Citations
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Hamblin, M. R. (2017). “Mechanisms and applications of the anti-inflammatory effects of photobiomodulation.” AIMS Biophysics, 4(3), 337–361. https://doi.org/10.3934/biophy.2017.3.337
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Avci, P., Gupta, A. et al. (2013). “Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring.” Seminars in Cutaneous Medicine and Surgery, 32(1), 41–52. https://doi.org/10.12788/j.sder.0023
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Chung, H. et al. (2012). “The Nuts and Bolts of Low-level Laser (Light) Therapy.” Annals of Biomedical Engineering, 40(2), 516–533. https://doi.org/10.1007/s10439-011-0454-7
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Barolet, D. (2008). “Light-emitting diodes (LEDs) in dermatology.” Seminars in Cutaneous Medicine and Surgery, 27(4), 227–238.
