I have a couple Friends running a real odd light schedule. A botanist on icmag wrote a thread on it. Sorry if I am breaking a rule here, Only trying to share info on it. I personally never seen the article, only medicated and listened to the theory. Anyways this is what they were running:
12 hrs on. 5.5 hrs off, 1hr on, and 5.5 hrs off.
Strange thing I have yet to try it myself, but I seen their results. Plants are not stretched or seedy. Mind you this is for veg, they are using 12 on 12 off for bloom.
First time I seen that I was like no way will it work. Well honestly it does. I am unsure I will use it on my newest hobby of growing auto's but have thought a bit about it.
Any questions feel free ask, I may get 1 to pop over here and answer them directly.