I think youll do fine with a 250 for the small ammount of space! i would get a fluorescent veg room tho, they work the best (for me)!!! Anyways, I think 250 is fine because u r having 36''x18"x36'' for each room...
For the 4.5ft flowering room your building, with the 250 watt hps you would get 7333 lumens per sq. foot. Thats fine in my opinion... I have gotten good crops with less lumens definately! Anyways, good luck! I'm too high for this... :jointsmile: