Light 12/12 or 18/6

I’m starting my first auto flower grow ever of zskittle. I plan on LST, bending and tying down, at 3 weeks. Should I set my lights to 12/12 or 18/6 for the entire grow?

18/6

Like creature said..

24/0.

Maybe a happy compromise between 18/6 and 24/0....... go with 20/4

Any of the above cycles - just keep it static thru entire grow.

The reason you want more light on your autos is it directly effects how big your plants get before going into flower. You want your auto plant to be as large as possible, because we have had ours flower while they were still very small..bad yield. The ones we grew under better lights were double in size.. started them all at the same time..

Personally, I veg every plant, auto and photo, 24/0 under T5HO for 3 weeks. Then all are moved to a bloom area under 12/12 assorted led. Keep dli/ppfd in spec and it's all good. After running this way perpetually for over 15 years, I'm about to figure these damn weeds are worth smoking!