If you enjoy couch lock, go with 12/12
I use a 10:30/13:30 flower cycle because I enjoy uplifting Sat highs and even the land race indicas I've grown do not couch lock. Nope uplifting, energetic highs and once you learn this it opens up a whole new world of growing because it is very true that different light timings bring out different genetic expressions. Like pretty much everything I grow creeps as well which I enjoy
If ya read DJ's book, he talks about experimenting with different light timings 15 min at a time till you find a sweet spot. All the book reviews bitch about the fact that he did not share his sweet spot in the book. I openly share mine but also point out that yours might be different.
Yields are only affected if you are a light dependent grower, if you are a grower that understands all the elements combined and properly tweaked is what makes the plant thrive then yields will be good. How do you think I grow 20 inch colas with T5's ???
There is so much more you can adjust and tweak to alter genetic expression, it becomes fun to see how you can alter the look, smell, taste, high of different strains. It is also why there is a difference in the same cut grown by two different growers.
and now the evil plug LOL All covered in my books