Red Light Therapy Wavelengths Explained: 630nm vs 660nm vs 830nm (and Which LUMILUX Device Uses Each)

If you've shopped for a red light therapy device, you've probably run into a wall of numbers — 630nm, 660nm, 830nm, 850nm — without much explanation of what any of it actually means for your skin or muscles. Here's a plain-language breakdown of the wavelengths behind LED light therapy, and which LUMILUX devices use each one.

What "Wavelength" Actually Means

Light therapy devices work by emitting specific wavelengths of light, measured in nanometres (nm), that penetrate the skin to different depths and are associated with different effects. The shorter the wavelength, the less deeply it penetrates — which is why blue light (a short wavelength) works mainly at the skin's surface, while red and near-infrared light (longer wavelengths) reach deeper into the skin and underlying tissue.

Blue Light (~415–470nm)

Blue light sits at the surface-acting end of the spectrum and is most commonly associated with targeting the bacteria linked to acne breakouts. It's a common inclusion in multi-mode devices like the DermaLux 7-Color LED Therapy Spa, which pairs it with several other wavelengths in one device.

Red Light (~620–700nm, Commonly 630nm or 660nm)

Red light penetrates further than blue light and is the wavelength most associated with supporting collagen production, skin firmness, and an overall more even-looking complexion. It's the most widely used wavelength across at-home LED devices, including the red mode built into the TheraBeam PDT LED Light Therapy Body Wrap, which uses 660nm red light specifically.

Near-Infrared Light (~800–850nm)

Near-infrared (NIR) light penetrates the deepest of the three, reaching past the skin's surface layers into the tissue below — which is why it's associated with muscle and joint comfort rather than surface-level skin concerns. The TheraBeam wrap combines 660nm red with 850nm near-infrared in the same device specifically to cover both skin-level and deeper support in one session.

Other Modes: Green, Yellow & Purple

Beyond the three core wavelength categories, some devices include additional LED colours as secondary modes — green and yellow are generally associated with calming and brightening effects, while purple typically combines red and blue for a dual-purpose mode. The DermaLux 7-Color Spa includes all of these alongside its core red and blue modes.

Do You Need a Multi-Wavelength Device?

Not necessarily — it depends on what you're targeting. If your main concern is one specific issue (jawline contouring, under-eye circles, scalp health), a single-purpose device built around that concern, like the V-Sculpt LED Pro or LumiLift Eye Perfector, is often a better fit than a multi-mode device. If you want flexibility to target several concerns with one tool, a multi-wavelength option like the DermaLux Spa gives you that range in a single device.

Is a higher wavelength number always better?

No — different wavelengths are suited to different jobs rather than being ranked from worst to best. A higher number simply means deeper penetration, which is the right property for some concerns (muscle recovery) and not the deciding factor for others (surface acne).

Can I use a red light device and a near-infrared device together?

Yes — many people use a facial red-light device alongside a near-infrared body device like TheraBeam, since they're generally aimed at different areas and different depths of tissue.

Want to see how all of this maps onto the full catalog? See the Complete LUMILUX Buying Guide →