just a note on the way i have seen diodes work
Generally what ever the data sheet is we can push it 2x.
300mw 635nm diodes do 500mw and 600mw just fine
the 500mw casio diodes do 1W just fine
So i would think if it can do 1.6 it should be able to do 3.
just think a 3W portable laser.
All we need...