It's cool they started flowering because of the light change. As long as they get 12 hours of darkness and 12 hours of light then they will flower. You need to up the Phosphorus intake and lower the nitrogen. So low on the N and I mean less than 3 and high on the P which should be about 10 if you can get it or a little more but careful not to burn it out. K should be about average which I would say around 5 which is in the middle. Make sure you have micronutrients and there are no bugs! Kelp meal is a good source of micro or seaweed tea. Good luck dude post some pics!