I've found that growing with a mixed spectrum yields well. The best ratio would be 3:1. That is to say that in veg use 3x 6500k bulbs for every 2700k bulb of the same wattage. As a side note, look up SCroG or lst training methods to keep height down in the pc. I say this simply because plants tend to double and even triple in size during the flowering phase. Good luck man.