When do i swtich to Vegetative State?

[Bluenote]

Alright so I just started growing about a week and a half ago. I started with a long pot and I recently moved the plants into individual solo cups with holes in the bottom. I have about 18 plants or so. They are under florescent lights and they are now growing their second set of leaves as you can see in the pictures I attached.

[So I'm wondering: When do I switch the lighting to 18/6. They have been on 24 hour light since they were planted.... So like a week and a half.

thanks!

Any time , I personally only keep seedlings on 24 until about that size , and clones go to 18/6 or 17/7 as soon as they get transplanted. Keep vegging under the fluoros for a whole , don't be hammering those seedlings with an HID for a couple more weeks.

Are you utilising T5s or T8s? And what spectrum do you have in the units?