I learned by researching about each type of modality on it's own. Like you can research LEDs or phototherapy on Google. NASA has done a lot with this technology. It's become quite comonplace to see LEDs and low level laser therapy or LLLT used in medical settings and with chiropractors and physical therapists etc. There are TENS units for pain reduction, zappers/blood electrification devices for getting rid of infections/parasites. Magpulsers are use for pulsing lymph, pain reduction, and rejuvenation. There are water ozonators and Colloidal Silver makers as well for getting rid of pathogens and other benefits. There is so much out there you can spend almost a whole day researching each modality. Start with what you can afford and build from there.

Steve

Far infrared has longer wavelengths than the typical 880nm infrared LED. I think the 660/880nm LED lights are a bit more biostimulative but each modality serves a purpose. The Far Infrared Sauna s can get real pricey.

Yes the 660nm red can be used to help sharpen eyesight. I have used my red LEDs to help my eyesight and I notice an improvement in visual accuity/sharpness after a few min/day on each eye. They are very bright so use at your own discretion. Try a few seconds eyes open and then close eyes a few seconds. You will see blue for a few moments afterward because the rods and cones in the eyes get overstimulated by the red. Just so you know what to expect. The difference after a week of use is noticeable.

Some research
http://www.newscientist.com/article.ns?id=dn2525