lol, i always tell people, all you need for veg is regular, standard, cool white flouro's, as many as you want, and a regular hps ballast (sodium as you say) for flowering, preferably in conjunction with side flouro's or an mh, or both. ill take any bud from my 6 dollar, parking lot hps bulbs, and you wont be able to tell the difference from one grown under a fancy ass 100 dollar sylvania, grow-lux, who cares bulb. but if it makes you feel better, go spend the money.