blomm max light periode on FEM?

K.I.S.S. = Keep It Simple Stoner 12/12 has worked flawlessly since the beginning. Dont try to fix it if its not broke.

Why would they drop DLI to start flower? That seems counterintuitive. You need to focus on DLI, which are the numbrs on that graph. Read the wiki to get the gist. hours of operation without rate of photons applied is insufficient information. you not to multiple rate by time to make sense of it, which is what DLI (also makes it relative to area so you can compare apples to appls... 35DLI is the same effect whether it is achieved over 12 hours of 18 hours.) Yes you can probably use 13/11 for most plants, but you may run into an oddball that re-veges, so it's not wirth the risk unless that ~8% bump to DLI (going from 12h to 13 hours/day) is going to be very important.. only with a weak light. With ambient co2, you want 35-40 dli produced by the light, assuming vast majority hits the plant - i.e. reflective walls in use and normal hanging distances, etc. With 1200-1300ppm atmospheric co2 you probably want 50-55 DLI. Temp and RH still matter and will impact each of these contexts. I would not reduce DLI entering flower unless there's a ton of quantitative data that proves it's a good idea. Possibly reducing slghtly at end of flower? But, i still don't like tha sound of giving less energy to the plant unless it is showing symptoms of damage from it. If it isn't getting damaged, it's making good use of that energy. The exact maximum you can give will depend on CO2 levels, Temperature and RH%. So, YMMV from other gardens.

For regular and feminized cannabis plants in the bloom phase, the recommended DLI range is between 25-35 mol/m²/day. This translates to approximately 12-16 hours of light per day. Therefore, blooming with 13-14 hours of light is within the recommended range for regular and feminized cannabis plants. It's important to note that these are general guidelines and the optimal light duration may vary depending on the specific strain, growing conditions, and desired outcomes. Some growers may choose to provide slightly longer or shorter light periods within this range based on their experience and observations.

To avoid any issues............12/12 is the only choice.

I recall reading something about this long ago. I believe different strains will bloom with more light, I think it was sativas maybe could get away with more than indica. Each strain will likely act different with most strains being hybrids. But I'm sure some strains can get away with flowering with a longer light interval.