Dr. Michael Hamblin
Professor at Harvard and has published close to 300 papers, mostly on phototherapy. Michael R Hamblin Ph.D. is a Principal Investigator at Wellman Center for Photomedicine, Massachusetts General Hospital, and an Associate Professor Harvard Medical School. He has interests in photodynamic therapy and photobiomodulation. (Source)
Below are a few interesting quotes I pulled out from my research into Dr. Michael Hamblin.
Q: How does LLLT work?
Absorption of Red and near-infrared photons.
Red = 600-700nm
Near Infrared = 780-1100/1200nm
Light has effects days or weeks after.