a shitload get the hps, if you can get a switchable ballast so you can use MH bulbs for veg then HPS for flower

that would be ideal methinks

and if you're getting the 400 watt you should think about more plants or ScroG to maximize your energy to bud efficiency


anyhow, get some high wattage bulbs (at least 42 watts) that way you don't need nearly as many. I'm not sure how many total you want, as I just started my first grow myself with CFLs. good luck