I ask because lux is not additive as lumens is. If you put 4 1000 lumen emitters in a single flashlight then you are indeed likely to get 4000 lumens of output, but that doesn’t mean the lux will go up the same way, it’s not linear like the additive lumens. So say you measured the Convoy C8 with a given set-up, then MRsDNF builds a light using 4 Convoy C8 reflectors and the emitter/driver set-up is the same to each one as was in the original C8. You’ll see the lumens go up exponentially, but not the lux. So adding 135 lux to a room of 3 lux isn’t likely to show the low ambient on the meter, it simply get’s overridden. And the candela reading we usually use is all about the intensity of the hot spot, a ceiling bounce totally diffuses that to the point of irrelevance. Lux is subjective here because it’s not taken in the standard context.
Shine a low output light on the wall, then shine a high power light on top of it. The overall brightness of the spot on the wall doesn’t get bumped (that you can see) by the addition of the low level light. The low level light just get’s over ridden.
All this seems obtuse to me and is confusing. Of course, my health for the past 18 years doesn’t help with this kind of thinking…