Hydro plants wont bud

[runfreak]

hey peeps, i have had my plants growing in my hydro set-up for about 5 weeks. they have gotten huge and i i wanted to start to bud them.
i changed the lighting down to 12 on/12 off gradually from 18 on/6 off,
i switched to bloom solutions.
i was thinking this would do the trick, but no dice.
what could be some potential problem that keeps plants from budding?
thanks for the time, most appreciated

 

[FreakNature]

How long have they been at 12/12 (not the transition from 18/6, but completely 12/12)?

 

[The Prof]

I had one soil plant go 12/12 for over a month before budding started
It might just be saving and the form one huge cola

 

[runfreak]

that makes so much sense, ive been peeking like mad and never thinking about it!!!! thanks.
these bad girls have been on 12/12 for a few weeks now

 

[FreakNature]

It's about time for them to show, then.

 

[signman2007]

Man just a sliver of light can herm a BEAUTIFUL FEMALE!