I want to buy 2 250 wat conversion light set ups how much should i expect to pay for 1 ballast, reflected and and a mh i want to start off with a 250 mh because i don't have enough money to buy both lights at the same time i was thinking one 250 mh for 3-4 negative plants before i buy the rest of the bulbs and other light. My tent is 2'7 x4'11x6'7