Use 18 hours of light, instead of 16. That's not quite enough hours. And yes, they'll keep growing. Actually, they'll grow alot faster than they will in veg, doubling or tripling their size, in the first 3 weeks or so. Keep that in mind, when designing their grow area, because they're going to end up being well over 2' tall, unless you use some kind of training, like LST.