Any lights outside of this distance will shut off, any lights within it will turn on. If you set it just beyond the screen's size, it will look like the lights are as normal. I defaulted it to 20 which I think will be perfect for most people's games (unless you're a crazy person who does 1920x1080 in which case 30 is better). For added fun set it to be too small (like 10) and watch your lights turn on and off in real time.
I haven't made these changes for MZ yet for a few reasons. One because I don't own it, two I want to see how it operates for people, and three because there are so many features that I want to see if breaks anything.
I have however made a UMC version of it for added speed. :LZSwink: