@Nug-bug you’re on the right track.
You can do what you’re asking, here’s what you want to consider. At any height, your light has so much intensity over a given area. It will have the most intensity directly underneath the center of the light, and get weaker as you move toward any edge. If you raise your light, all of those numbers will drop and the footprint of your light will get bigger. If you lower it, the intensity will go up but your footprint will get smaller.
Moving 2 lights closer together or further apart will have similar results. The closer together they get, you’ll start to see the light intensity come up at the point where the 2 lights begin to blend. Most lights if ran close enough together can provide one central “hot spot” that will be greater than the intensity of a single light alone. Whether that is good or bad really depends on how much light intensity is there and how it translates into your new total footprint.
If you want to tinker around with it, there are a few smartphone apps that measure light output. They’re not really worth a damn for hard data, but a decent one should show you some references to what you get from 1 light at a given location vs 2 lights at any given location.
Hopefully that helps.