A common question about red light therapy is whether it can still be effective when used over clothing. The short answer is: red light therapy can partially work through clothes, but effectiveness is reduced.
1. How Red Light Therapy Penetrates the Body
Ka whakamahia te whakamaarama rama whero red (630–660 nm) me te tata-infrared (810–880 nm) wavelengths. These wavelengths are known for their ability to penetrate human tissue more effectively than shorter wavelengths like blue light.
Near-infrared light, in particular, can reach deeper layers of muscle and connective tissue.
2. What Happens When Light Meets Clothing
Clothing acts as a physical barrier that can:
- Reflect part of the light
- Absorb certain wavelengths
- Scatter the remaining light energy
The degree of light loss depends on:
- Fabric thickness
- Tae (dark colors absorb more light)
- Weave density
Thin, light-colored fabrics allow more light to pass through than thick or dark materials.
3. Red Light vs. Near-Infrared Through Clothes
- Red light (630–660 nm): More easily blocked by clothing
- Near-infrared (850 nm): Better penetration through both fabric and tissue
This is why devices that include near-infrared wavelengths tend to perform better when used over clothing.
4. Does Clothing Make Red Light Therapy Useless?
No—but it does reduce efficiency. Less light reaches the skin, meaning:
- Longer sessions may be needed
- The delivered dose is lower
- Results may be less consistent
For best results, direct skin exposure is generally recommended.
Conclusion
Red light therapy can work through clothes to some extent, especially when near-infrared light is involved. Heoi ano, direct skin contact ensures more reliable and effective light delivery.
