Lots of good info, some very specific chemistry I was certainly not aware of, thanks!
I had a question though, and I'll preface it by clarifying that I am by no means a biologist (other than the armchair kind). I read a dissertation a while back on classifications of plants. The paper was specifically about a class which (according to the author) indicated plants which do not require dark periods. I wish I could find it again, because some of the details are hazy, but I do remember it was a letter based system with maybe 4 or 5 classifications. Anyway, he basically listed a number of plants in this classification, which included cannabis. Basically the end result of the paper was that this classification of plant did not require a 'dark period' and in fact lay dormant during this period, and therefore would grow faster with no negative effects on a 24 hour light cycle.
Could you possibly explain where the discrepancy might be?