I don't know if red light therapy works but a friend of mine claims it helped him. His mom used it for another problem and said it didn't help her.
I'm not sure whether her son just thought it helped or if it actually did help, but even if it was psychological it still worth it. Someone here on connect once paid $8000 for some type of device and claimed at work and I asked my doctors about it. Both of them said that it couldn't have worked so who knows maybe it was psychological, but it was still worth the $8000 if it got rid of her pain or even if she only thought it got rid of it according to my doctors.
Take care,
Jake