What Light through yonder Window Breaks?

Can a plant still flower if only given blue light & if so, why use such lights as hps?

yes it will but no where near as good with the orange/red light, just the same way you can veg under the wrong spectrum light.

if you have really strong veg growth and decent flower growth does it equal out to decent flower growth and strong veg growth.

Like alot of nodes with decent bud, compared to a few nodes with dank bud

the closer the nodes the better really, the plants will still flower because its to do with the hours of light it gets, but to get the full benefits they should have the right sort of light, can you not throw in a couple of cheap 20 watt(100 eqv) 2700k lights will make a difference