Jon,

If you read the article, they state that they use LED system like used for muscle and joint issues. These systems obtain a FDA exemption or type of grandfathering that allows them to be used in ways that would otherwise require very expensive clinical study.

The wave length of the light appears to be the important part. But, they only penetrate 1 cm into the brain. Finding a way to increase penetration will be helpful.

The point of my posting the link was to show that healing is complex such as helping the mitochondria function better.