Changing light for flower?

Ok, Thanks a lot for all the answers. Reason that I was planning on leaving only 2-3 weeks grow is that my tent isnt very tall. Im worried that if I do leave them for 4-5 weeks they will get too big for the tent

Hola Si es fotoperiodica déjala por lo menos 4 O 5 semanas en 18/6 De luz Y después ponela 12/12 Y si es automática lo mejor es 20/4 siempre tanto en vegue como en flora suerte en tu cultivo🤗🌱

Hi! You must wait a bit after topping, the plant need to recover and laterals stems need to grow a bit. Also, 2 weeks is a very short vegetative period, especially if you use this kind of methods who are stressful for the plant. You may wait 2+ more weeks before turning it into 12/12. The longer the plant remains in a vegetative state, the better its structure and yield will be.

It's been 2 weeks only. I'd say leave in veg for another 2 weeks before you flip.