I just heard that leaving fug lights on for 24/7 is no good. Eventually with time that macro will die and pretty much turn into mush. The way I look at it, is if that was the way to grow plants, why doesn't a greenhouse leave its lights on like that. At first I left mine on 24/7, and had no issues, but now that I switched my plants are growing faster. It was a marine scientist that has been running reefs for 25yrs. now, who kind of explained the whole thing and it made sense to me. But this board is all about experiences and opinions, so it really up to you and what believe to be correct.