My question would be this. If we have the correct spectrum for the specific phase of growth drummed into our heads, and we agree that light towards the red spectrum (hps) is actually required...for flowering...and that light towards the blue spectrum (mh) is actually required...for vegging...why would a person think that a red spectrum light would grow a plant efficiently in it's vegetative phase? I would think that a plant grown with hps from start to finish would be about 14 feet tall with nodes about 12" apart.

But as latewood suggested, try it and show us what it looks like.