Light rendering

I have a lot of questions. But I’ll start with 1:
I have a SweetHome3D model I have rendered dark. Then separate renders with each light on and the rest off. I’m at the step to import into Gimp and make layers. This will be great at night, but how do you have a bright render display during the day (with lights off)?

I just make the contrast between light and dark obvious enough that it works night and day.