How do I designate a light as dominant?

Thanks for the reply. I think I get that, that only one directional light, and that you don’t designate yourself a light as “dominant”, by some property called that. I guess the question is more, if you have multiple directional lights in a scene, which one does the engine decide to use as that “one” dominant directional light? The first one you place? Or some other factor (e.g. the one with the highest intensity)?