Well, I have done some looking and have found research on using LEDs to promote healing. See this link showing some research done by/for NASA:
I also found this page but I am not sure who the source of it is:
I am curious if I can assemble an array of LEDs that can reproduce some of their results. I need to find out the following: 1) wavelengths of the light, 2) duty cycle of the light, and 3) exposure time.
I have some reading to do...