Need thoughts RIU

View attachment 2568402Ok RIU I need some advise quick. I'm currently on my second grow and I've move from a smaller apt to a bigger apt with taller ceilings. I want to know your thoughts I've been on the second grow for about 3 1/2 weeks and its going very well, do you guys think I should began flowering in 2 weeks or should I vegg it a lil longer ? My ceilings are around 9-10 ft so I have plenty of head room. I'm using a 400w mh and a set of t8's I'm gonna flower with the 400w hps. I know a general rule of thumb is to switch when there at the desired height but I'm beginning to get greedy since my first grow did pretty good my new grow room is HUGH ill get exact measurements later. Basically I just need to know whether to flower in 2 weeks or veg it longer. i was planning on switching to 12/12 on 4-20-13 thoughts.

If u have that much room grow some monsters....obviously longer veg time....u should know this bro cm on.

Plant can potentially doubke in size when u switch...if u have all that room veg em to 3 footers then flip

Veg them to at least 2 feet. LST for multiple branches. Upcan them and flower..

Oh kno man Im just used to dealing with smaller plants so I'm gonna try my luck and veg it till it hits about 2 1/2 ft or so