Impossible to flower under 24/24, though it would probably veg, though not as well as 24/0.
I've heard of someone going 12/6 in flower to speed things up... anyone else heard of anyone doing 12/6 to flower?
I know some people say it's the DECREASE in the LIGHT period that promotes it to flower, while others say it's the INCREASE in DARK period that prompts flowers. I personally believe the former, which is why I think 12/6 would work.