660nm vs 850nm
Why Your Red Light Face Mask Needs Both Wavelengths to Shine Simultaneously
If you have been shopping for a red light face mask, you have likely noticed that most mid‑range to high‑end models include two distinct wavelengths: 660nm red light and 850nm near‑infrared (NIR) light. They are often arranged in a 1:1 pattern on the inside of the mask and turn on together every time you use it.
