You simply designate an object to be light emiting and make the Ambient Value some really high value. Well, that's what I did in this image:

Probably not the best example of what can be done, but there are no lights in this image. Light sources are: skydome (which you sort-of see out the window) and the lampshade for which Ambient_Value is probably set way too high at 40, but I'm just having a play... interesting effect, anyway, even if it isn't pretty. :biggrin:

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks