I don't switch to 12/12 to determine sex, as I have seen recommended in various sources ... I just wait it out, patience ... the ONE time I did switch back and forth between veg/flower/veg/flower for sexing, it caused weird mutants, resulting in one-leafed branches, from the light-stress ... (it was a 100% sativa, which I suspect , 'may' be more sensitive to light changes, just a theory) ... there's no replacement for patience, when growing plants ... :smokin: