Joe Cohen of SelfHacked lists 45 benefits of red light/near infrared therapy and each has links to the medical studies to back it up.  Check the list out.

When it comes to the benefits of LLLT, there are simply so many studies out there that it would be impossible to list them all! Nonetheless, to give you a sense of the sheer number of effects that LLLT can have on your health, I mostly stuck to referencing the first studies I found when looking at each of these effects (many of these have dozens of studies backing them up) . . .

SOURCE: https://selfhack.com/blog/my-review-of-lllt/