I don't know about the costs , but I'm thinking LEDs should be cheaper than low level laser diodes. Unless it has something to do with the # nm part.
I don't know if anyone here ever finalized a helmet design, or actually tried it.

Since you are looking outside the box for treatments, what about things like grounding/earthing, detoxing, naturopathy, acupuncture?

What are your dad's most bothersome symptoms?



I can recommend low level laser therapy (also called cold laser, soft laser) for muscle & joint pain, as I had successful and quick results @ chiro appts. Treatments were for wrist, foot, shoulder, elbow, low back & neck pain. Many times it only took a one time tx of 20-30 seconds to stop the pain in this spot.