Exactly the issue! That wall is a single material, and has not changed from picture one and picture 2.. It's acting like something is blocking the light, but there is nothing between the lights and the wall except for the panel that creates the light 'grid' effect, which has also not changed. The first image, I was happy with the lighting but it just wasn't bright enough... Unfortunately, I made a number of changes at once before re-rendering and it was one of those changes that is causing this effect and I tried to walk it back but I haven't been able to fix it... :(