Emission would be the light output from the surface. Not sure what it looks like with the Basic engine, but when matched to CineRender it makes the surface a simple light source. I believe there are some limitations to it's use as a light though, which I suspect might have to do with shadows and bounce. Have not dealt with it in years... Usually define a light strip with a emissive material, then use an omni or plane light as the actual calculated light source.
Thank you, Barry. Yes, that's the one. I don't think it's a teamwork file, I am not sure if I'm using hotlink modules either.
The main purpose I am modifying the Emission is so that my materials appear brighter when I save the perspectives. All the images were too dark and this is the easiest way I found to brighten it all up. Unless there is another way?
If your scene is dark, you could instead increase your Sunlight settings to increase the amount of light in the scene or increase the Ambient Reflectance is your surface to increase how much of said light is reflected?