The "target" is a lux meter.How big is the target? Is it 1m^2 or an infinite wall, at 1m distance?
Wondering how to glean hotspot vs corona information.
but you can see more with more lumens
Humans suck at judging brightness in of itself...but you can see more with more lumens, but, most of the added vision is to the sides in a broad pool of light...and less is added to a central hotspot.
In real life, the beams tend to have three main parts though: A hot spot, the brightest part in the center, the corona, a donut shaped ring of somewhat dimmer light around the hot spot, and spill, the light that was sent out past the reflector bowl without being focused.