If you were to change the time of day the lights came on by leaving them off for 24 hours then starting them at a different time would this effect the flowering plants negatively?
i have done that a couple times in the grow i'm about to finish and i noticed that as long as your plant gets at least 12 or more hours of darkness at a time, regardless of when the darkness was. so if you want you can just reset your timer to the new times and it shouldn't matter. or you can the way you suggested either way would work
Why leave the lights off for 24 hours? Just go ahead and switch the times on the timer. No need to stress the plants. MHO