The way I do it now is basically: Spawn a light entity, place it in the room, playtest, see where else light is needed, adjust the lighting, then place props to make the light actually seem its coming from somewhere. But in the end, what happens is that the prop gets this massive unrealistic shadow behind it, or it doesn't look like it's the reason the light is there. I've always though you tie the light entity to the prop or something, and somehow the prop will produce the light realistically (you know from the prop's luminescent texture). So am I doing it wrong or right? And is there a better way to do this?