autos flowering light cycle

No.

It's an auto you can either run it under some high wattage at an 18/6 or weaker light at 20/4 plant can only take so much light in a day making a full 24h in-efficient. I have also had autos under 12-12 soooo kind of subjective to how you want to manage your grow. Ligh interruption won't herm them as it would a photo.

If you can keep it at 18/6, do it. If you have to go 12/12 because of other plants, that’s ok too— just takes longer. Leave it be if you can because it want make the buds fatter.

Keep on 18/6 . Autos only grow for a certain amount of days so giving them the most light in the shortest amount of time is best.

With autoflowes, you should select light cycle that provides the most DLI without damaging the plant... whether you give 20 photons ove 12 hours or 20 photons ove 18 hous, it's the same amount of energy at different rates of delivery... the rate of delivery doesn't impact much according to cursory professional studies. So, give as much as you can without light bun symptoms or an incredibly droopy plant for multiple hours at end of light cycle.... 35-40 DLI is your typical ceiling for ambient co2 and a loosely controlled envionment. 260w light covering how much? i'm going to guess 260*2.2 = 572 umol/s, maybe bit less. If you are covering 1m^2 , i'd stick to 18/6. That's 37 DLI and you can fine tune from there based on observing plant. If you are covering a smaller area with this light, you can reduce hours of use poportionally from 1m^2... some common sense needs to be applied.. distance from canopy dictates optimal coverage which can then dictate how many hours you want to use... better to work backward from best coverage and those dynamics will often dictate the rest. figure 2.0 - 2.2 efficacy for a light like DS600. this allows you to guesstimate umol/s of PAR producted - 520-572 give or take... divide by area of coverage (in m^2) then reference that value on a Daily Light Integral table (DLI). 572 / 1m^2 is 572 PPFD, you cross that with 18 hours on table and see it is just under 37 DLI. simple as pie. within reason, any combination of hous of use and PPFD that results in roughyl 37 DLI will have similar results beyond what a human eye can resolve.