aren't the 640s 150mw each? so you will have something like 300mw of 640 and 450mw of 660, or am i wrong
you know that blue is not a problem, you can set it to the desired levels. Your green is a given power and it is this that determines the levels for the other colours
if i had to throw in a forecast, i would say that you might need more red, but you will not be very far from the mark. maybe, at a later stage, swap the remaining 660s with 640 and you are done
the way you are now, i think that you will get a white with a cyan touch to it
"its called character briggs..."