Well bigbud751,

Sure you can transplant anytime you like your the grower. Now the question is how will your yield be effected?

Depending on your light source the plant may already be root bound at week 4 and the plants health may start to suffer.

So your main interest is having as many plants vegetating as possible? There is nothing wrong with that. You need to remember one thing though. If you want big buds you need big root balls. If your doing a sea of green don't sweat it.

Any time you transplant it will take close to a week for the plant to recover. Therefore doing it during flowering will lower your yield or extend the flowering time.

Whatever trade off your willing to make just don't claim you were not aware of the consequences. But what do I know?

Loco