// 660nm
Surface · Skin · Collagen
660nm sits on the surface. It's the wavelength dermatology clinics use for collagen density, fine lines, surface inflammation, and skin tone. It's where the cosmetic evidence is strongest - and where the visible results show up first.
// 850nm
Deep · Muscle · Joint · Recovery
850nm is near-infrared. The human eye can't see it, but it penetrates past the skin and into muscle, connective tissue, and joint. Mitochondria deeper in the body respond. Oxidative stress drops. Recovery accelerates.
Why both. The published evidence is strongest where these two wavelengths overlap. Every Operation: Gear product fires them simultaneously, in a 1:1 ratio, with irradiance calibrated to the form factor. Same protocol. Different coverage.