First grow, should i switch to bloom? + rep for feedback

They are in big pots so have grown slowly and gone through a N problem, but they look ok and have been growing fast recently. should i switch them to under 1000hps at 12/12? if not now when?

I tried to supercrop one and it seems to be recovering... still growing but the stem has split.. thoughts?

Im wondering about switching the 4, in the pics below.




These are just 6 others that are younger, topped two of em a week ago.

hps is good for vegging as well. 18 6 would be good.
i do 20 and 4 under 2 600 watt hps cool tubes.
they look too yellow. they are ready for 12 12 when ever u are. but the yield wont be as much.

I would get them to about 12" and at least 4 nodes, then take them 12 12 ... remember a plant will normally grow 1-2x its present hight in 12 12

yea thats true. my plants were about 3 ft when they entered the flowerin phase. im about to harvest and they are pretty close to 6 ft.

ok well then the time is probly now, the biggest is 24 in. smallest is about 10 in with 6-7 nodes