It changes throughout the grow.
Here’s an example
Seedlings 25’c 80% humidity
Early veg 27’c 80% humidity
Late veg 28’c 70% humidity
Weeks 1-3 flower 28’c 70% humidity
Weeks 4-6 flower 29’c 65% humidity
Weeks 6-8 flower 29’c 50% humidity
Weeks 8-10 flower taper down from 29’c-26’c
And from 50%-35% humidity.
That’s just an example of what’s working best with the phenos I’m running atm.
tip… buy an ir thermometer to check ur leaf temp, this is often the most important measurement after vpd.
hope this helps