CANNASIManswered grow question 7 years ago Hi There bro, you may flip switch to 12-12 from week 3, generally speaking you calculate how big you what your plants to be so during the stretch they double in size, some stretch more others less depents on the strain, also you accoubt the time you have to be able to compleat the cycle. 6 Weeks veg i think is a good balance.
Happy growing, all the best!