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B GanjaGecko nailed it.F B lip lip to 12/12 V C C to flower the fem and the autoflower plants won’t care just the yield will be smaller.

As long as you provide the same DLI over 12 hours that you do over 18hours, you can grow autoflowers and photoperiods in the same tent without any negative repercussions. simple context.. photos need 12 hours of darkness, so that's what the tent has to be. There is no loss of yield as long as DLI is maintained -- all other factors ignored.

You an change the Cycle, but the Auto will be ahead anyway and wont be affected by the 18/6 Lightcycle.

The answer is dli. You need more Power then. At least 33% more light+ more and also more after the Stretch. Otherwise Your plants are on diet but they need more in flower

Yes, change the light. Flowering plants thrive under a different spectrum of light than plants in vegetative stage.

if you have time you can go a more natural way and shorten the dark time from week to week , 16 / 15 / 14 / 13 /12 hours and your fem will slowly continue towards full bloom, and your Autos get more light than with hard 12/12 switch. (had this with a GG4 Auto + Amnesia Photo - the Amnesia is still blooming and the Auto delivered 101g... but i takes some time)

Yeah you can change or you have to change the light to 12/12 when you want to send the Fem into flower. But you won't get as much out of the Autos when they get 12/12 the rest of the Time as they will give you when they get 18/6 till the end. Automatics perform better when they get 18/6 all the time. Automatics and Fems in one tent is a little bit tricky, it works better when you have a vegetation-tent and a bloom-tent. So yo can move the Fems into the bloom-tent when they are ready and the Automatics will finish in the vegetation-tent, where you can put a new Fem on the way which you can put into the bloom-tent when the first fem is ready

That is what you would have to do in this case

Ye