Inverse square falloff lighting bug - when I toggle it off my light goes dark, and I can never get it back again.

So I have a scene setup in Unreal 5.1 - I have my lighting set correctly, but I just wanted to toggle the inverse-square falloff.
It broke my scene.

Now I can only toggle between totally dark, and some other version.

Neither of which was how my lighting was to start with.

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Hello
Same problem here. Lights (in that case spot lights) broke after I did a test unchecking inverse squared falloff. To get some light I have to keep it unchecked and use strange values in the falloff exponent.
Has anyone some kind of explanation/solution?

I think I know what happened, I also had the same situation. I realized looking closer the lights were not totally dark, just almost off. The “intensity units” changed when toggling “Inversed Square FallOff” back on from “candelas” to “Unitless”.

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Thank you! It was driving me crazy, I couldn’t figure out what was happening. Still kind of seems like a bug they should fix though.