I have a plant in my living room that doesn't get much light, and so it doesn't do very well. I've always been told that light from normal lightbulbs doesn't help because it's not "natural" light. But then I started thinking. The filament glows from the current and I'm just wondering what makes the emitted light not "natural"? It's just something that gets red hot from something and so emits light? Also - theoretically - if I could build a campfire in my room that would probably work since that would undoubtedly be natural light right? I mean, what is the sun if not just one huge campfire?