Idk if it applies to you but I have a 2×1 veg tent, 3×3 veg tent and 4×2 flower tent. After my photos go from the 3×3 veg tent to the 2×4 flower tent I run autos in my 3×3 veg tent. Then start new batch of photos in my smallest tent about 3 weeks before my autos finish. This way it’s not perpetual grow but ever 2-3 months I get great harvests.

18/6 is perfectly fine for an auto.

autos are on a time clock, they will flower regardless of light cycle.

photos need a 12/12 light cycle to trigger flower.

i say you have options;

Start with 18/6 wait til auto flowers and then trigger your Photo by switching 12/12 because the auto wont be affected. Your yield might be.

You may have to top or veg out the photo a bit depending on…

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So I use my veg tent pop 3 photos and one auto leave the auto in the veg and don’t change anything real easy works out auto is done curing around the time I chop the photos

The Autos will grow regardless of your light schedule. For example, I run my autos for 21 hours to avoid ludicrous kw/hr charges in ”prime time” hours. The only thing the DLI will effect is your yield as long as the genetics are good. I always recommend Speed Run Seeds for autos.