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I was working on my track, and I encounter one of the most bizarre issues: Why isn't the light working?
Technically from my experience, the light works if you increase the light's range in the thousands, and at a certain elevation.

Before you asked, yes, this is a Lego track and I heavily modified it with blender by Marv's & Dummiesman HabitatB addon. I have no idea what I did wrong. Did I delete something that caused the issue or something?

The normals aren't exported correctly, that's why the light can't be calculated correctly. I've uploaded a hotfix to HabitatB, so please reinstall it from GitHub (both master and dev branch include it).

I've since started on a rewrite of the add-on which fixes a lot of export issues, including the one you encountered. If you only used PRM for your track, you can use it already.

It doesn't support .w export just yet. I might get to that next week.

I PM'd you with a solution.