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There are several ways of illuminating your 3D scene. These include "Lamp" object types, emitting light from mesh objects, and environment illumination with a "World" texture.
It's one thing to know how to introduce light into your scene and another to make illumination appealing. This chapter covers a standard 3-point light setup along with HDRi illumination.
Fancy a knowledge test? Go ahead. I dare you.
In applying what you've learned, the challenge here is to light a pre-made bedroom scene once for day time and once for night time.