On day 42, two days ago I step up from 30 DLI to 45 with my new light, the old sister 7 days older looks happier but the young sister is not happy at all, the pictures are taken 60min before lights off and over 50 mbar on the tensiometer, I watered yesterday. What do you think?
10-15% less might do you well.. the plants adapt to environment. the light provided is part of that. so, maybe the pigmentation in the droopier plant is not enough to handle all the light as is, but if you gave 35-40 (whatever your local temps, rh and co2 allow) from early on it may be able to handle it better.
e.g. you take an indoor plant outside and it can wilt like crazy due to too much light. but if a clone of that plant was maintained outside, it'd be fine.. One way or another, the plant subjected to high intensity light above and beyond what it can use per day develops a defense against it.
if it's only super droopy last 2-3 hours, that's not so bad.. 10-15% adjustment will fix it. it may take a bit to snap out of it. don't be afriad to adjust further, then maybe go back up a bit in a couple weeks and see how it goes. trial and error. take notes. it may not be exactly the same each time but it'll be very close. Sometimes it takes a week or more to see "too much", too. Another good reason for notes to look back on.
in future you may find starting with more light early on will allow you to go a bit higher.. Though 45 is almost certainly too much for typical ambient CO2 / temp/rh combinations.. some moving parts there so it's impossible to give an exact value to target. Genetic variance is a thing, too.
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