You can grow autoflowering plants on a 24/0 light cycle. However, there are studies (and they've been cited on this site before) that show that the dark cycle is great for root growth. Everyone knows root growth=nice buds. I've grown lowryder once and I would recommend at least a 18/6 cycle. Then again, root growth is mostly done by flowering period so I'm not entirely sure if it would make a difference by now. I just started them on 18/6 when I grew and they turned out alright (besides it being my first grow- learned a lot since then...). Good luck!