Best time in flour and cycle to increase the light time to 16 on 12 hours off
I can’t advise you to do that in flowering. It will become a problem real fast. That is unless your trying to force Hermie?
And maths might be wrong but is that 28 hours a day?
I would just Keep it simple 12/12 it … or Dj short style that shit 11 hours on 13 off he swears by it …
I use 11/13
As the others have stated 16 hours will cause herm or reveg issues. You can run 13-14 hrs of light if you use far red at the end of the light cycle for 5-10
If you try to pull that 18on 6off only do it for the last week and half of flower