Natural light for me - in So. Cal. it's seems to be sunny all the time. I don't have and external flash for this camera and I hate my tiny built in flash. I either bump up the iso or I use ghetto lighting for my indoor shots. I do have studio lights but I have not had a chance to set them up yet. And I use the big mass of incandescent gas, in the sky, for my outdoor shots.
(jdepould - sorry if I have any grammatical errors

)