Other than Daylight Mode under a maps' page settings, anything that emits light or had vision will have a token. Light emitting tokens may have been placed on the lighting or map layers. Double-clicking on a token will open its token settings; clicking on that menu's Dynamic Lighting tab will open a menu showing whether that token has vision enabled or if it emits light (it's a long menu, so you'll need to scroll down to see all of it). You can look at those settings to see if that light source's have been set up to have a color or tint.
