the science · April 2026 · 4 min read
Blue light therapy for skin: what 415nm is really for
Red light gets the attention, but blue light around 415nm has a job of its own. Here is what it’s for, and why good masks combine the two.
When people talk about “light therapy” they usually mean the warm red glow. But many good masks also include blue light — and it is worth understanding what that shorter, cooler wavelength is actually there to do.
What blue light therapy is for
Blue light sits around 415nm — a short wavelength that works right at the surface of the skin. In an at-home device, it is typically included to help keep skin looking clear. It is a surface specialist, which is exactly why it complements deeper wavelengths rather than replacing them.
Blue vs red light
- Blue (≈415nm): surface-level, helps skin look clear.
- Red (≈633–660nm): near-surface radiance and even tone.
- Near-infrared (≈830–850nm): deeper, supports the look of firmer skin.
They are not rivals — they are a team. A mask that offers red, near-infrared and blue covers the surface and the deeper layers in one calm session.
read next 633 vs 660 vs 830nm: a plain-English guide to wavelengthsBlue light is the surface specialist. Red and near-infrared go deeper. Together, they’re a complete session.
How the halo uses blue
The halo combines red 633, near-infrared 830 and blue 415 — surface to depth, in ten hands-free minutes. As always, the wavelengths and the FDA 510(k) number are printed right on the product page. Only cleared. Always shown.
Meet the halo — red, near-infrared & blue
shop nowlaia glow devices are FDA-cleared under the 510(k) numbers shown on each product page. They help improve the appearance of skin with consistent use over weeks and are not intended to diagnose, cure, treat or prevent any condition. Individual results vary. This article is for information, not medical advice.
from the guide
the halo — $289
A full-face flexible-silicone mask. Three cleared wavelengths, one soft ritual.
