@NORBY, I did something similar by going from 24/0 down to 19/5. I just did it in small steps going down 15 minutes at a time. Didn't see any adverse effects. I did 24/0 through veg to see if it would make a difference. Believe it did as the plants seemed to be a little bit larger, but no definitive proof.
Now I split the difference and do 19/5. The most common schedules are 20/4 and 18/6.
I cycle my lights at 20/4 because after trial and error it seemed to consistently produce the best results. But at the end of the day, proper DLI is the key no matter the schedule.Hi @NORBY
I think it’s strain/pheno-dependent on how much light the girls can handle, but it also comes down to the grower.
To run them under 24/0 you need to be on target in every aspect or else there is a big chance you will end up with a stressed plant showing multiple signs expressing something is wrong - foxtailing, nutrient deficiency or burned leaf’s etc.
But I do recommend 24/0 during veg and stretch, then a switch to 18/6 or 20/4 during bloom.
Try everything until you nail it