You can if you want to - but there are a number of members that run 18/6 for autos. I’ve got five nearing end of week eight now and they’ve been on an 18/6 schedule since they went under the LED 2 weeks after sprout.
Amnesia Haze Auto
Blueberry Auto Top
Two Northern Lights and another AH in a small hydro. They all sit under a 450w LED.
I must say that at first I was kind of disappointed in the autos - having seen them go into flower around the start of week four and at 10-12" tall… But they’ve continued to grow and now the colas are really starting to swell up. I know this is your AH thread - but I’m REALLY looking forward to the Blueberry…
Good Luck with your AH grow!!!