Interesting conversation earlier about temps, Here is what I learned from a few decades of growing, and torturing them lol to see what happens. If during the day the temps are quite a bit higher then that of night time the plants will produce extra gibberellin causing them to stretch, in my testing I think 15 deg. difference is minimum for this if you want to see difference, 20 deg swing is better, 5 - 10deg. difference you will get some stretch but minimal
if the night time temp run the same or higher, it reduces the gibberellin , controlling or reducing stretch to a very minimal if any.
Another way to control stretch is to cold dump your room. meaning for the first few hours of lights on bring the temps down to 5 - 10 deg. below your night temps, done during the first couple weeks of flower I found to be the most effective
As far as night time temps go, the biggest limiting factors is practical experience and imagination with it, don't mean that in a bad way, through veg and first part of flower I see no real advantage other then stretch as mentioned above, but from the 4th week on bring in the cold at night, the later in flower the colder it can be, 80f day to 35f night not only is no issue but has some really nice benefits to it. I've actually brought rooms below 32f. when light go out slowly bring temp down over the night, then just let the light bring the room back up to day time temp. just no sharp swings.