So they are 2 weeks old now, depends how you want to grow them out.
Heres some thing to think about:
What strain? Are they short growers, do they grow a single cola, should I LST, Top, or Super Crop. Or should I just go straight up Xmas tree.
How many will you have in total under the light and what is the space? Smaller space, more plants, you may want to go straight into flower...for example.
Fewer plants, more space, you may want to veg out longer for bigger yield. But look at veg time, against extra veg time and yield ratio to figure this one out. For example, I see seed seller saying 1m square - 400-500 grams, and that is for just about any plant. Some plants just do not yield that. try to look up your strain. If it's bagseed, just go for it. You will learn a lot from your first grow this way.
If you want to clone, perhaps a good idea to wait until you can take clones from the girls, then 12/12. However you can also take clones from flowering plants no problems as well.
Sorry to load you with info, just thinking out aloud.
Any more Q's you know where we are....at the 600 of course.
Peace,
DST
Realistically you can put them under the 600 now. No problem. Just keep the light a bit further away from them. Keep an eye on temps, etc, and you will see them explode my man.