When should I switch to 12/12

Just wanted some other opinions on when I should switch to flower. I have a 3×3×6 room and I am trying some nirvana mystery seeds so have no idea of the strains. I have 3 that seem like they are growing at the same pace. I have been vegging for 4 weeks now. I topped them to so I'm sure that will make a difference to. Just wanted to hear some other opinions.

You had better flip them now or they will be up in your lights before they finish flowering.

I totally agree with potpimp if it's sativa dominant you certainly better lol keep up with your work and stick to these forums and you won't go far wrong matey good luck

Thank u for the input

Look into low stress training... I use 8 gauge coated wired (6 to 12 inch) pieces to get plants growing in ways other than natural growth.

Already started some lst plus they been topped I got them tied down . I think I'm going to switch this weekend they should be just about perfect size. I'm pretty sure I have 2sativas and 1 indica. Has anyone had any experience with bossled.