I have links on lasers & infrared light in post # 1 in the stickys.
here- there might be newer info out there - I haven't searched on it for a year or so.

Laser/ Infrared/ far infrared info
http://laser.nu/
http://www.purehealthsystems.com/infrared.html
http://www.purehealthsystems.com/mus...in-relief.html
http://www.toolsforwellness.com/far-infrared.html

It's interesting to read about the differences between Infrared{near/far}, low level laser/cold laser and LED light therapy.