Yeah that would probably work better for photos than autos. Autos have their own life schedule and will be done when done
If anything decreasing the energy given will probably decrease swellness of calyxes and more clear trichomes than cloudy to amber. Hence running 24 on compared to 20 or 18 on. Obviously if you are running em 24 on, u r converting more energy running them longer
In the long run I think if u chop in 10 days and run your lights steady at 24 on producing more energy, then your plants will be more ripe and plump giving em 100%
Compared to only giving 70% and less plump and swole in those 10 days