The research was done with a unit containing  670nm, 735nm and 880nm LEDs. from 
this company http://www.quantumdev.com/products/led/spectralife.html Very 
expensive (like $3000) but powerful unit. V's combo 660nm/880nm unit should be 
able to get similar results at a fraction of the cost of the Quantum. 
http://www.theledman.net/660880dual.htm

-- "Al Riley" <a...@domsys.com> wrote:
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I remember a while back that there was a quite extensive discussion of the use 
of LEDs to treat cancers, particularly oral cancer.   I purchased two different 
LED units from V (one of our esteemed listers), one was a 660nm array and the 
other was an 880nm array.  One was more effective in the treatment of oral 
cancer, but I can’t remember the particulars.  Can anyone remember the jist of 
the discussions.
Thanks
Al Riley