absorption and scattering of light determine the light energy distribution in tissue
scattering depends on the wavelength (660 nm and 850 nm)
scattering determines the light distribution
at red (660 nm) and infrared (850 nm) the multiple scattering is greatest and the penetration depth is relatively large
no coherent laser radiation is needed in photomedical treatments, especially if the target is cyt.-c oxidase
conclusion: acu-led is effective and has the same effect as lasee and needle acupuncture and is completely safe