Some low level lasers have multiple diodes to treat larger areas.. Many were developed for veterinarians first.. so horses, cows etc.. probably race or show horses brought it into play because of a big money sport..and no drugs allowed for certain sport/competitions.

The one my chiro used had a 2-3" head , so multiple diodes , I didn't look at it more closely or get the brand name, I was just happy it worked so fast to reduce/stop my pain...

There is the faster treatment time frame to consider with low level laser vs LED light.
per area - laser -20-30 seconds vs LED 20/30 mins. or more.

* I'm comparing the time frames for me - to my elbow, shoulder, wrist, neck etc- the low level laser was so fast..
For head injury might be a different thing totally.

I bought a Light Relief Infrared Pain Relief Device years ago - http://www.amazon.com/Light-Relief-I...dp/B000GAAANG0
It did not even come close to comparing to the Low level laser relief for me.
I could not tell the pain was less , the warming felt good, it probably did something good inside , but not a " wow, it doesn't hurt anymore"...
Of course low level laser prices start @ 1000.00 or so .. so I'm still waiting for the price to drop..