hi i started my grow of with a 600hps deul spectrum my mate said that would be ok but ive been reading up and found that i should of started with sum think smaller maybe,anyway just after 4 week my plants are showing all three as females'great' and there 2 foot tall,when should i start the flowing cuz my grow tent is 6 1/2 foot tall could they out grow the tent i would'ent want to burn them if i could'ent move the light any higher.any help would be great.