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They shouldn't do anything more than show preflowers with that light. Unless you are experienced with sexing plants it is a good idea to wait for the males to cluster before you kill them. If you know how to sex them, and dont want any seed, kill them.....
Sorry I misunderstood your question no the plants wont flower until you give them 12 hours dark time,preflowering is part of the vegetative phase which normally extends 2-3 weeks into the 12/12 photoperiod,its a good idea to use high N during this time.
Preflowers usually won't show up on short vegged plants, but almost all plants will show preflowers under longer veg cycles. I veg for 8 weeks and all my plants except my Princess Diesel males showed their sex. The PD males didn't show until I put them into 12/12 for about 10 days. Then I had balls everywhere. Fortunately I got the little fucker out of there and used his pollen to make an F-2 of the PD and slapped a little on 2 phenos of afghan/bullrider.