The wavelengths of 630nm, 660nm, 810nm, 830nm, and 850nm all have clear effects on hair growth, but their levels and mechanisms of action are slightly different, collectively forming a very comprehensive and effective hair growth phototherapy scheme.
Simply put, this is a powerful combination of "surface repair+deep activation". Here are the specific functions of each wavelength:

Light wavelengths (from ultraviolet to far infrared) affect the human body through optical, thermal, or photobiomodulation effects, presenting both benefits and risks