How red light therapy works
LED masks shine specific wavelengths of visible red and sometimes near-infrared light onto the skin. Researchers often call the broader field photobiomodulation.
Wavelengths in plain English
Wavelength is one way to describe the color or type of light. Many cosmetic masks list visible red light around 630–660 nm and near-infrared light around 830–850 nm. Some also offer blue or yellow modes. The number alone does not tell you the delivered dose or how well the mask fits.
What the evidence means
Published research investigates cosmetic skin outcomes using different devices, doses and treatment schedules. Results from one study do not automatically apply to every mask sold for home use. Treat strong promises and precise timelines with caution.
Using a mask thoughtfully
Follow the device’s instructions for session length, frequency and eye safety. Check with a clinician before use if you have a condition or take a medication that makes you sensitive to light, or if you are unsure whether a device is appropriate for you. These guides cover consumer skincare devices and do not provide medical advice.