After studying it all day long, I've decided not to implement the yellow light nor the z-fighting because z fighting would be more difficult to replicate than it seems, for example, level 6 room floor on OHC's video it's so horribly made it is even difficult to comprehend... As for the yellow light in ZKLoper's build, there's actually 2 lights flickering, while on OHC's original version it's just 1 light. Why is this an issue? Because those light intensity are different and they flicker different, so it's basically "fixing" a problem just to bring up another new one.
That said, you can still grab level 1 light from this build and put it on your own one, the original properties por the corridor lights are: Range: 10 Intensity: 2 (so you can bring back original light intensity)