Quote Originally Posted by cnd411
You can switch as soon as a couple days after transplanting. Give her 24 hours darkness before you change your light to 12/12 cycle will help flowering a bit earlier than normal.
What about the time it takes for the plant to catch up to the light cycle and switch it's internal clock from veg to flower? What about keep up with the last weeks veg nutrients for the first 3-day's of light switch then flower nutrients?