I have done near infrared light therapy for restless legs and also localized healing. It has helped me. Here's a crazy link that covers all kinds of things related to it, including a helmet.

http://heelspurs.com/led.html

NASA actually came up with healing and near infrared. There is a lot to this concept but I don't know about paying 15K for inclusion in a study.

I personally use infrared lights designed for night security systems. They are around 750-850.