flowering cycle does not need to be 'exact' no worries, ... nature is not 'exact' ... there are cloudy days, rainy nights, you get the picture ... after vegetative growth during the long-days, the plant starts flowering shortly after encountering shorter 'days', thinking Fall is fast approaching ... in nature, the hours of light would be slowly, and gradually changing ... the plant switches to flowering when the daylight hours are shortened, not necessarily by a 'set' amount (the typical 12/12 works very well for cannabis, but can vary quite a bit without much difference)... :smokin: