go ahead and veg under 250...I do it in a closet...and it works great. As garden knowm stated...keep it away a bout 2 feet until they start to beg or stretch to the light then lower it a couple inches a day until you get it 12-18 above canopy(this should take a week or so)...dedicate a fan pointed under lamp/over plants.

put hand at top of plants...If hand burns, then plants burn...with fan you should have just a little warmth on you hand and that is the distance you want to keep your light at...hope this helps. lw ...as plant grows...raise your light.