There is an interesting article in the Thoroughbred Times (grant you horses) 
about LED's and laser therapy.  Quote: Both lasers and LED's work by delivery 
light energy, but LED's deliver light energy but posses less power output.  
Laser power output is measured in watts, while LED's power is measure in 
milliwatts.  It also states that you would not want to utilize laser therapy on 
primary or secondary cancerous lesion because this would increase the metabolic 
rate of cancerous cells, thereby empowering them further.

We have a LED's unit that can be programmed for different power for different 
depths.   We love it.

Dianne



>
 From what I have read, the red works somewhat better on infections, but 
the infrared penetrates deeper.  For other things they seem about 
equal.  I ordered a 96 lamp unit from V yesterday with both in it.

Marshall