How to cull the backside of a mesh but keep the lights inside?

Question

First off: the "backface culling" option for materials doesn't seem to do anything.
Second: I got the effect I wanted (almost) by using the Geometry node to mix a Transparent shader with a Principled BSDF using Backfacing as the Factor:

I need to keep the lights inside the rooms "trapped". The light should not be escaping like it is. How can I fix this?

romain · Answer

In your picture, lights look like point. try with out lights and change the color of cubes:
picture 1

secondly, add black ground with a material with many roughness: picture 2

And play with cube's nodes
according to me it's the only solution.

How to cull the backside of a mesh but keep the lights inside?

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