12 and 12 is the flowering sweet spot.. Some strains will flower at 11 some at 13.. There is a biochemical reaction that happens in Cannabis when in darkness for long periods that say hey it's time to start flowering... The same thing happens when you grow cannabis outside as the seasons change the she get's a lot less light she says hey it's time to go into flower.. 6-6-6-6--6 would be an infinite veg cycle understand?