Noticing that red led light passes through skin, and through the knuckles of my hand, and that my neutral Led lights pass red light through, I've taken to turning my Zebralight H600w on high and going over sore knuckles and elbows. It seems to help with recovery, well enough that I don't care if it's placebo or not, when they're sore I'll run the light over the trouble spots and they seem to recover faster. I had some pain that had been slowly getting a little better over weeks, ran the light till it was hot a few days in a row and then forgot to repeat, elbow quit bothering me.
YMMV.