😏😏No more 12/12 lighting?? 😏😏

It does not really matter.........just make do with what you have. Leave it at 12/12 and do not go to 13/11. It will not flower properly at 13/11. You do not need to have EVERYTHING absolutely perfect to harvest quality cannabis.........don't stress!

This qustion makes no sense. If you have not flipped, all you have to do is give 14 hours or more of light... i'd stick to 15h or more to be safe, as a few plants will 'flip' with 10 hours of darkness. This is verifiable information you can look up with primary sources. This is what tehy teach in a plant biology class as opposed to often mistaken anecodote. If you mean after you flip, it depends. 8% more DLI (12h to 13h, ceteris paribus) may or may not be worth the risk.. IF already near 35-40 dli, probably not worth doing it. If significantly below, might be worth the try. The point at which a plant flips is variable. It is not the same for all plants. Some may flip to flower with 10 hours of darkness. some may need 11 or 12 hours of darkness. 13/11 should work with the vast majority of plants, but eventually you would run into one that will revege if you switch midstream or just not go into flower at all on 13/11. since you are not in flower, you will not cause a re-vege. Try 13/11 and if they all start visibly forming buds in 7-10 days, it's obviously safe to use and you can eke out ~8% more DLI compared to 12/12. Remember, the 35-40 dli value is not absolute, either. How well you control temperatures, rh and the ambient co2 will dictate "max" DLI. Local variables matter and make for a different "max" than other gardens. 35-40 is alos overshooting slightly in most cases. ... well, 40 is, and 35 is probably a smarter target to start. Because it is variable, you will need to observe and adjust based on plant growth -- too tight, needs less; too lanky, needs more. You don't want a plant with nodes stacked directly on top of each other blindly following some recommendation that isn't meant to be used so literally. there'e's also lots of misinformation out there. PRoviding 50-55 DLI with ambient co2 is going to be a giant waste of electricity. This graph you posted is retarded. Also, i'd love to see the data with an appropriate sample size and control group that shows uo should give less and amp up over time... i have serious doubts about that hypotheses and only magnified by the suggestion to give 50-55 dli lol... probablly damage the plants.. and even if the plant adapted to that much light, it's not actually converting that excess light to sugar above what 35-40 dli would produce per day in the plant. beware of 'initial' studies. 90% of initial studies fail to hold up to scrutiny. This gives a false sense that science flip-flops often, but in reality anyone more familiar knows to be incredibly skeptical of initial studes. they are not facts. they are a first step that is often flawed... or intentionally fucked up like that 11-person study from the UK that said vaccines are linked to autism. A total trash doctor with trash methodology paid to publish some trash research. It happens.

At this stage in your growing experience, learn to grow before worrying about PPFD and DLI. Learn to diagnose your issues through internet research. Better knowledge retention! 13 on/11 off should read 11 on/13 off (vs 12/12). Go ahead and experiment only way to find out what happens. In your case lower the light for more intensity. Showing a garden would help. Here is an example of using internet research: 11/13 Flowering Light Cycle: Can it Improve Your Grow? https://weedkb.com/11-13-flowering-light-cycle/

see if your plant will start flowering at that schedule and if she does your golden. if not then drop it to 12/1

Flowering can initiate with 11 hours of darkness so be careful. Even 10 in some cases. Don't fret on getting a perfect 40 dli, chances of every other process running to optimal to make use of the full 40moles is unlikely. Allowing cannabis to grow Into the high intensity light knowing what it has ahead of itself In terms of intensity is paramount for good development, I try not to move the light too much, whole point of the stretch is to get the cola into high intensity light needed for flower. Constantly moving the goal posts is a detriment to plant development. P.s generally don't wanna play with circadian rhythm of cannabis, adding and removing hours here and there is one of most stressfull things a plant can endure, anytime I've done it with the concept of "helping ease" the plant into flower only made seeds come harvest.

Generally speaking, no. This would be cultivar specific. Change your canopy height, aka your light fixture relative to canopy height. Red ratio increase at lights off can help facilitate this if you must change photoperiod.

with white widow it realy fine, i'm always do 13/11 80-120k lux but u have to first to chek how's it'll do with your strain, some strains could not go to flower with 13/11 some can