Has anyone here tried red light therapy? If so, what were your experiences. There are so many devices, each one seems to have a slightly different nm range. I've seen devices from 660 & 850 to 620, 670, 760, 830nm. There's even one with 670 & 810. And, I'm sure many more. Is there research on which one is best and for what? It's quite confusing and these devices are very expensive.
Thanks and hope everyone is having if not a pain free day, a reduced pain day!