When to switch lighting to 12/12?

Im after some info on when I should switch these to a12/12 light schedule. Both White Widows, growing in coco, using the Flora Trio of nutes with their recommended schedule - currently just finished week 4 transition stage.
I usually grow autos, hence why I need a little advice.

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They still need some time it looks like
Can you show us the full tent? Seeing a very limited view here.

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Plants can easily double in size first three weeks after switching to 12/12. A good way to look at this is when about 50% of your available grow space is occupied, switch to flower. If you need to veg longer continue with week 4 until you switch to 12/12

Exactly what I was getting at ^^^

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Oh I have heaps of room left, gorilla tent, with extension on top.

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