Nice job on the training!
I use a light meter to dial in my height and dimmer setting. They can take a lot more light than you might expect. Our eyes aren’t very good at measuring in that range.
If it’s too high you’ll get burnt looking leaves in the upper parts of the canopy but the lower parts will look ok. Sort of the opposite of a nutrient deficiency where it usually starts from the bottom.
If it’s too low, the plants might stretch more than they should and look “skinny” or “lanky”.
There’s a pretty wide range in the middle though where you won’t see either of those problems. The plant just won’t do as much photosynthesis as it could have, and the amount it does do has a direct correlation to total yield.