What is the ideal height for mounting studio lights?
I know that they need to be higher than the subject, and typically when I see setups for portraits of adults they are a few feet higher than the person, but is there a general rule in terms of feet, percentage, etc, or is it "get them as high as you can"? The reason I ask is that I'm trying to figure out how large I can go on a modifier (either octagonal softbox or PLM) being limited by 7' ceilings. My "subject" is my 2.5' tall son, so I do have a lot of room to go up, and I want to go as large as possible on the modifier while still being able to get it high enough above him. Thoughts? I'm leaning towards a 64" PLM, a 60(ish)" softbox, or a 48" softbox.
Keep in mind that I can mount from the ceiling, so it could technically be right on top of him shining straight down, but I recognise that isn't really the ideal setup.