Light does not travel through propped open doors.

[Originate]

If you have standing lamps built nearby doors which are propped open light will not travel through the open door. I have linked a save file so you can see this in action in my game. The sleeping area on the south side of my colony has quite a few lamps and hallways with/without doors. Thanks!

https://drive.google.com/open?id=10LaZH6IfODaNUiKdt2xI15ie6Mr7-SE_

[Tynan]

I was gonna write that it's not a bug (and it's not, really since we never intended to do this). But it does make sense as something that should happen. And it's feasible.

[zizard]

There's a workaround if you use nutrient paste dispensers as walls.

[Kenneth]

Same issue: https://ludeon.com/forums/index.php?topic=42756.0
Bug was moved to mantis.

Thanks for reporting!