Often LED & LLLT (low level laser, cold laser, soft laser) get confused with each other as the are both light therapy devices. LED is often less costly than Laser.

LLLT should only take 20-30 seconds per spot treatment, where a LED will take 20-30 minutes per area.

I wish Dr. Khan's site had more detailed information, but I guess they don't want to give info away for free. I did read it is mostly the soft tissue and c spine being treated not the actual brain or head. I was wondering about that..

My chiro used a LLLT very successfully on my wrist, elbow, shoulder, foot, low back and c spine. Just a quick 20 seconds per spot and pain was gone.
Of course he did adjustments also.

When prices come down a bit more I plan to buy my own..
The brand name LLLT are running about 1-3 thousand still.
http://www.coldlasers.org/home-equipment/