observationally i'm currently vegging 4 plants at 24 hrs a day, temps are a lil cold at about 60F . One good thing i noticed is plants stay shorter and more compact.
just easier for me to keep it at 24/7
will be planting outside last week of may
once planted outside they'll stretch a bunch before going back into full veg
Ive done both 24, 20, and 18 on, havent noticed a huge difference. However, at least where i live, my power company offers a "dynamic peak pricing plan" where from 7am-3pm i pay a regular rate, from 3pm-7pm i pay like 10x the regular, 7pm-11pm regular, and 11pm-7am i pay a out 25% the regular rate. So i keep all my lights off from 3-7pm and run the budroom 7pm-7am. I notices a 200 dollar drop in my bill when i switched over, now i pay "only" 1100 a month.