Well you could argue that I could save X kw/h and be right but it’s worth it to me. I have a small efficient 100w rig for veg and then I move them under my 300w flower rig and let them veg there for a very short period of time.
It’s so brief that it’s hardly even worth mentioning.
My point is guess is pick one and roll with it. Adjusting height and intensity at the same time doesn’t sound like fun to me 