Sativa,

I have grown in the past (indoors) and have had the best luck with both halides and HPS running at the same time, one HPS in the middle and halides spaced evenly around the HPS..... one thing that I will say is that if you are going to grow indoors use CO2 injection... unbelievable results, you can actually watch your plants grow. There are many cost effective ways to harness CO2 for your plants... GLTY