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the scene is lit up using three spots placed 120º apart

enter image description here

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When using images textures that are not meant to be color information (such as the specular and normal maps of your material), you have to set their color space from Color to Non-Color Data :

enter image description here

Without that, they won't behave as they should and might produce artifacts.

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In Node Editor window: Try adding Texture Coordinate and connect UV node into vector nodes of all the Image Textures you have. (Node Editor: Shift+A>Input>Texture Coordinate)

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  • $\begingroup$ Image texture nodes already use UVs by default. $\endgroup$ – L0Lock Nov 25 '18 at 9:59

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