How does light therapy work?

Light therapy operates through photobiomodulation (PBM), where specific wavelengths of red and near-infrared light interact with cells and tissues. These wavelengths—commonly 630 nm, 660 nm, 810 nm, 830 nm, and 850 nm—are absorbed by mitochondrial enzymes, influencing cellular energy production (ATP) and supporting balanced biological processes involved in skin renewal.

• Red light (630–660 nm): Primarily acts on the surface layers, supporting fibroblast activity, which contributes to collagen organization and smooth texture (Li et al., 2021).

Together, these wavelengths have been studied for their potential to assist the skin’s natural recovery process by influencing tissue oxygen exchange, cellular balance, and collagen network organization.

Applications for scars and skin recovery

Light therapy can be used as part of cosmetic routines aimed at supporting even texture and comfort in post-recovery skin. It is non-invasive and easy to integrate into aesthetic or at-home care settings.

Common cosmetic applications include:

• Minor cuts and marks: Targeted light use may help maintain comfort and visual uniformity during healing phases.

• Stretch marks and uneven texture: Studies using combined wavelengths (630–850 nm) have shown improved cosmetic texture and elasticity (Hyun et al., 2025).

Key benefits at a glance

Cosmetic light therapy aims to promote skin balance and smoothness through gentle, consistent use.

At-a-glance advantages:

• Non-invasive, contact-free application

• Supports a smoother and more uniform skin surface

• Can be used to complement post-procedure care

• Encourages natural skin balance and comfort

• Suitable for different skin types and recovery stages

Who can benefit?

Light therapy is suitable for those looking to maintain comfort and evenness in post-recovery skin or to support general skin balance after minor cosmetic procedures. It is appreciated by individuals and professionals for its gentle, consistent, and easy-to-use nature.

How to use it in practice

Post-surgical areas: Begin light therapy only after the skin surface has closed and appears stable. Sessions of 10–20 minutes, 3–5 times per week, may be suitable for ongoing maintenance.

Minor marks or uneven areas: 5–15 minutes per session, several times per week, until desired balance is achieved.

General recovery care: Integrate into broader self-care or cosmetic recovery routines to promote relaxation and visual uniformity.

Consistency is more important than intensity. Sessions should always be performed on intact, clean, and dry skin.

Scientific context

Multiple studies have explored how light in the red and near-infrared spectrum interacts with skin tissue and may contribute to smoother cosmetic outcomes after injury or surgery. For example,Li et al. (2021) found collagen and elastin production could be stimulated by combined 630 and 850 nm wavelengths.

These studies form part of a growing body of evidence on how light energy can influence tissue homeostasis and optical appearance within cosmetic contexts—without implying therapeutic or medical claims for redtreat devices.

Why redtreat

At redtreat, we combine precision light delivery, safety, and usability to create a comfortable experience for both professional and home use. Our systems use research-informed wavelengths to support skin wellness and aesthetic recovery routines.

• Targeted red and near-infrared wavelengths (630–850 nm)

• Balanced irradiance for consistent, gentle exposure

• Swiss expertise ensuring reliability and comfort

Disclaimer

The scientific studies referenced on this page are provided for educational and informational purposes only. They describe general findings on light–tissue interaction and do not represent clinical or therapeutic claims for redtreat products.

Scientific References

• Li, W. et al. (2021). Low-level red plus near-infrared light combination induces collagen and elastin production. Journal of Cosmetic Dermatology.
• Hyun, S. et al. (2025). Clinical study to evaluate the efficacy and safety of LED & IRED at 630 nm and 850 nm for skin rejuvenation. Medicine Journal.
• Hernandez-Bule, M. et al. (2023). Unlocking the Power of Light on the Skin: A Comprehensive Review on Photobiomodulation. Journal of Photochemistry and Photobiology.