After watching the video I see a design flaw. The new HEI optics extend past the body of the Radion shining light in all directions, making unpleasant viewing angles. It's noticeable in the side by side comparison of the G3 and G4. The TIR lens doesn't have this problem unless your looking up at it.
Hopefully I'm wrong but that's what I see in the video. Left side of the tank looks brighter too.
I saw the same thing and is quite disturbing.