Well think of the sun, the sun obviously has both spectrum's(just a little higher in one spectrum than the other depending on the season).
And as for positioning your lights have something like this > B = blue light, R = red light.
veg B>B>R>B>B or R>B>B>B>R
bloom R>R>B>R>R or B>R>R>R>B
lol something like that