Here is my suggestion. Use floros of CFL's for vegging, and use that hps for flowering. In my opinion, hps bulbs should only be used for flowering. From the grows I've seen, using an hps for vegging, the plant stretches a lot. You get stretched out budsites and when the plant stretches during the first few weeks of flowering, they get twice as much stretched out and the result, from what I've seen, is airy, wispy, lanky buds. Just my 2cents.

I use CFL's for vegging, and hps for flowering, and my buds stay thick, compact. Good luck