Seed lighting question? :)

Was wondering if hypathetically speaking ,I grow my seedling for a cpl weeks and i have no flower area or room, can i go to 12/12 with the cpl week old seedlings after being on 18/6 for the 2 weeks? Im growing under cfl's...and want to flower all plants together? So can I add my 2 clones that have been in veg for a month with my seedlings and bud everything together? Im aware that guys will go 12/12 right from seed, so my gut tells me yes, but wanted to confirm it wont kill them?
Thanks guys, and gals!
Cheers!

Nobody? Well i will try it and post results if no ine can give me a yes or no?
Cheers!

There are tons of 12/12 from seed threads, and inside I think there's a few instances of people starting the 12/12 a few weeks after sprout. I wouldn't worry.

Perfect! Thanks for taking time to reply my friend!
Cheers!

I usually veg my seedling for 2 to 3 weeks then flower with no problems, I do it to keep my plants small due to space.

Thats my issue! Have small cab and about 2.5 ft maximum height for plants...need them to be small, not concerned about yeild so much...ty people!

you will need to top and scrog severely at that height