If we have a house, a room and we use the default lighting system, we don't have any "problem"

But, if we use the light of the sun to the world, will have a dark room.

We need to put a light inside the room.

We create an object(could be a box in the ceiling) and when we define a color to the object we need to check: Emits Light and define a value for:Emited Brightness.

In the Setting tab we check Surfaces also.

If we increase the Emited Brightness we have more light.

We can have only some faces emiting lights. We can change the color of a face of an object and the light emited will be different.

Look our first test:

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