No stretch

you stunt plants with training more, than any small planty genetics could. you still get random size plants when grow from seed. heavy training, intense light will shock them 4sure. i tried not once to blast plants , hoping they wont run, i personally never atchieved it with like 10 different led lights i tried during those grows and 50 strains or so, but i blasted them during flower, never in veg.

Your concern about the plants not stretching much during the first weeks of flowering and ending up smaller can be due to several factors. It's not necessarily related to the amount of light they received during growth. Genetics plays a significant role in plant structure and growth patterns. Some strains naturally grow more compactly, especially certain indica-dominant varieties. Also, environmental factors such as temperature, humidity, and nutrients can influence growth. If you followed a PPFD schedule from Telos, it's unlikely that the light was insufficient. It's important to consider all aspects of your grow environment and the specific needs of your strain.

unless you have a real quantum meter, your DLI reading is probably sketchy AF. Looks liek you stripped a ton of leaves. Kinda hard to grow without solar panels, longs and storage of necessary bulding blocks, too. could be smaller plants. could be light, but if that was the case your nodes would be stacked closer together. I don't see a ton of leaves sprouting from same spots, so there is some spacing there. if you only did a 4 week vege, some plants won't grow much taller than that, but i think at least some portion of what you see is self-inflicted. read up on DLI, the wiki is good enough to get the gist. I don't know "telos" so i'm not sure if they bungle it up or not in their explanation. you'd be better off using teh specs of yourlight and guesstimating what PPFD you provide on your own than using any lux-to-dli conversion app on a phone. you'd need several measurements across entire canopy at same distance and then if the app doesn't ask for area (m^2 or sq ft can be converted), it didn't actually calculate ppfd or DLI properly. 35-40 dli is about as high as you can go with ambient co2. YMMV, because several factors impact what "max" is for your local garden. Trial and error is needed. use resulting internode length to adjust intensity. take notes on what ends up working the best, and start there next time... limited adjustments from then on. 12hours vs 18 hours.. that stuff is proportional as long as you keep other factors the same. put the hours of operation you are coming from in the numerator, and that's your factor to adjust power.. 18 to 12h is 18/12 or 3/2 or 150%. This is why you often heard "you need 150% more in flower phase" .. that's only if going from 18h to 12h. if going from 20 down to 12 you need even more relatively speaking per hour (or second). Need 167% of previous power to provide same DLI (give or take.. efficacy of equipment can change at various power which would make a small impact) hanging distance should be more about properly covering entire area of garden with good, strong light, but can also be used to make adjustments to light intensity. hopefully, it's just hung at the best distance to give you the best average umol/s over entire canopy.

in my experience clones will stretch alot less and seeds and some strains do not stretch alot at all and other strains will double in size its just down to genetics thats all sativas tend to grow much larger than indicas though only if you allow them to. if you haave flowered early like week 3 then not going to be a big plant to begin with so you wont notice much stretch but if you vegged for a long tome she will most likely stretch more. just my opinion :)

A stretcher plant doesn't always mean a better plant. If you're just creating big gaps between your nodes your light will be less effective at the bottom of your plant. A lot of stretch is genetics, a plant that wants to stretch will do so regardless of how close or powerful your light is. Not saying it can't be impactful but it's probably moreso in early veg than in flower.

You could try less light, but I think Blue light helps keep the plant short wile red light will help stretch. so maybe more red light.

Mine also didn't stretched as much as i wanted them to and i think it was because i followed the LED manual too early. After switching from 18/6 to 12/12 i lowered the light and turned it from 75 to 100% like the manual said but instead i should have put it a little bit higher, so they would stretch for light and then after 1-2-3 weeks dial it in to what the manual says. This is what i will try next time

To get them to stretch a little I lower the light strength a bit for the 1st week of flower.