What they need to do is remove those lights entirely and bring back the UV lamps. That's the only way you can make black walls and backstage areas mostly invisible. Unless they want to do a from-scratch rebuild that adds a ton of new murals and overhead scenery to hide this stuff.
Even a dim normal lamp isn't good enough. Plus the props and figures were painted specifically for use with UV light and don't look right when lit with bright normal light.
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^This is what a number of the scenes now look like since the past few years. And for those who don't remember or never went on the ride years back, no, the scenery isn't supposed to be lit that brightly and the ceiling and mechanical elements are not supposed to be nearly that visible.
They're not. That's one of the motivating factors behind the new show. They're trying to remove anything that could be deemed problematic.