Edit hint for brightness factor
It's not really a factor when the values are 0‒100.
This wouldn't be accurate either. It doesn't reduce the brightness to that about, it reduces it BY that about. For example, if we are at 70% brightness, and the factor is 50%, then we will be at 45% brightness (because 50% of 75 is 45%), if that makes sense.
Ok, then maybe I misunderstood the option... But does it (i) remove that percentage or (ii) go to that percentage? So for example, we are at 70% brightness and the "factor" is 20%; do we end up at (i) 56% or (ii) 14% brightness?
We end up at 56%, we reduce the current brightness by that factor. It's a bit confusing, I agree. Maybe we can reword the option.