Research this. LED therapy has been around for a long time. NASA is one of them.
Warning. Some types of these LED's should not be looked at directly. On my unit it is the invisible spectrum.
These thing are also useful for wrinkle control.
Ebay search. A lot of them to go through. Find the one you like with Free Shipping.
Amazon Search. Go through the Amazon comments. They don't bite their tongues, if they don't like something.
NASA and researchers led lights health benefits search
LED Lamps and pads are used for pain relief. I do have a small one that i have used on a tooth that finally had to be pulled.
Go through this search. Lots to choose from. Research LED Therapy some first too.