labifleanswered grow question 6y ago Hey gardener! Since you're growing indoors, you don't need to sync anything with sunlight since we invented indoor growing to actually do without sunlight and the sun cycle that only allows for growing part of the year. So if you want to make your plants flower, switch your light to 12/12 and the magic happens, but not on 16/8. Your friend, on the other hand, will have plants that are synced with the sun, so you can harvest before September, but he'll have to wait until September or later. Good luck to you, bella ciao!