well explained my weed buddy, in acctualy after more yeild and arnt bothered about the flower time ,,thanks lotsHere's the idea:
13on/11off - Extra hour of light = Extra hour of energy gathering. So, more yield and Longer flower (less grow time).
12on/12off - Standard Flowering Schedule
11on/13off - Extra hour of Dark = Extra hour of growth time. So, Quicker flower and less yield (less energy gathered overall)